Merge remote-tracking branch 'origin/qms/develop' into qms/develop
This commit is contained in:
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a8329f6a2c
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@ -0,0 +1,132 @@
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# PDF 数据提取方案
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## 一、项目概述
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本项目从工程图纸 PDF 中提取尺寸标注数据（数值 + 公差 + 直径符号Φ），基于 Java + Spring Boot + PDFBox 3.x。
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---
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## 二、Φ（直径）符号识别方案
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### 2.1 问题背景
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工程图纸中，直径标注以 Φ 符号前缀表示（如 Φ280 ±0.15）。不同 PDF 生成方式导致 Φ 符号在文本层的表现完全不同：
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| PDF 类型 | Φ 的存在方式 | 可提取性 |
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|---------|-------------|---------|
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| AutoCAD 导出 PDF（类型A） | 文字字符（BerlinSansFB-Bold 字体），独立 TextGroup | ✅ 可提取 |
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| 其他 CAD 导出 PDF（类型B） | 矢量图形路径（画的圆+斜线） | ❌ 不可提取 |
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### 2.2 类型A：文字形式 Φ 的提取
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**流程：**
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1. `PositionedTextStripper` 提取文本，乱码字符（如 `¡¤`/U+00A1 U+00A4）通过 `correctGarbledText()` 映射为 Φ（U+03A6）
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2. `TextGrouper` 将相邻文本元素分组，但 Φ 和数字因字体/位置差异通常分属不同 TextGroup
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3. `DimensionIdentifier.findLeadingSymbolGroup()` 在维度数字 TextGroup 的左侧搜索独立的 Φ TextGroup 并拼接
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**关键参数：**
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- 符号集合：`Φ`(U+03A6), `φ`(U+03C6), `Ø`(U+00D8), `ø`(U+00F8), `∅`(U+2205), `⌀`(U+2300)
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- 空间搜索范围：`gapFromSymLeft ∈ [-10, maxGapFromLeft)`，`dy < maxYDelta`
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- `maxGapFromLeft = max(dimFontSize × 5.0, 70)`
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- `maxYDelta = max(dimFontSize × 3.0, 40)`
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- 渲染顺序过滤（seqDiff）：`dimSeq - phiSeq >= 180`
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- AutoCAD PDF 中 Φ 符号在早期渲染层（seqNum ≈ 33-37），数字在后期层（seqNum ≈ 228-239）
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- 真正配对的 seqDiff = 195~205
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- 误配 "160" 的 seqDiff = 173，误配 "6" 的 seqDiff = 6~7
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- 阈值 180 可完美分离
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### 2.3 类型B：矢量图形 Φ 的启发式推断
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当 PDF 中 Φ 是图形路径时（整个页面无任何 Φ 文本字符），采用配合公差启发式规则：
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**规则1 — 配合公差直接推断：**
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- 文本含配合公差代号（如 `230 m6 +0.017`）→ 自动加 Φ
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- 排除：大写 R 开头的代号（如 `15R4`），因为 R+数字 通常表示圆角半径而非配合公差
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**规则2 — 附近配合公差 TextGroup：**
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- 搜索范围：dx < 100, dy < 50（像素坐标）
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- 附近存在 2-3 字符的配合代号文本（如独立的 "H7" TextGroup）→ 加 Φ
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- 示例：`280 ±0.15` 附近有 `H7`(dx=56, dy=14) → 识别为 Φ280
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**已知局限：**
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- 当 Φ 是矢量图形且附近无配合公差代号时（如 `Φ55 ±0.15`），无法自动识别
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- 此类情况需用户在提取结果中手动添加 Φ 前缀
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---
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## 三、文本提取管线
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```
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PDF文件
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↓
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PositionedTextStripper.writeString() ← 提取每次文本绘制调用
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│ ├─ 重建 Unicode 文本（TextPosition.getUnicode()）
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│ ├─ correctGarbledText()：修复乱码映射
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│ └─ 生成 TextElement（含坐标、字号、seqNum）
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↓
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TextGrouper.group() ← 按空间邻近性分组
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│ └─ 生成 TextGroup 列表
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↓
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DimensionIdentifier.identifyDimensions() ← 正则匹配 + 符号拼接
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│ ├─ TextNormalizer.normalizeText()：二次乱码修复
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│ ├─ 正则模式匹配（公差/配合/螺纹/纯数值）
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│ ├─ findLeadingSymbolGroup()：搜索独立Φ TextGroup
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│ ├─ inferDiameterFromContext()：配合公差启发式
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│ └─ findNearbyTolerance()：搜索附近公差文本
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↓
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DimensionResult 列表 ← 最终输出
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```
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---
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## 四、乱码映射表
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### 4.1 correctGarbledText()（PositionedTextStripper）
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| 原始乱码 | 映射结果 | 说明 |
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|---------|---------|------|
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| `¡¤` (U+00A1 U+00A4) | Φ (U+03A6) | BerlinSansFB-Bold 字体直径符号 |
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| `¡ã` (U+00A1 U+00E3) | ° (U+00B0) | 度数符号 |
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| `¡À` (U+00A1 U+00C0) | ± (U+00B1) | 正负公差 |
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| `¦µ` (U+00A6 U+00B5) | Φ (U+03A6) | 直径符号变体 |
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| `¡Á` (U+00A1 U+00C1) | ± (U+00B1) | 正负公差变体 |
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| 单独 `¡` (U+00A1) | Φ (U+03A6) | ¡¤ 跨 writeString 拆分时 |
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| 单独 `¤` (U+00A4) | 删除 | ¡¤ 跨 writeString 拆分时 |
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| U+FFFD | 删除 | Unicode 替换字符 |
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### 4.2 TextNormalizer.normalizeText()
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与 correctGarbledText 类似的映射，加上：
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- `Φ\u0080` → `Φ`（Windows GBK 尾随控制字符）
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- `Ø\u0080` → `Ø`
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- `±\u0080` → `±`
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- `Æø` (U+00C6 U+00F8) → `Ø`
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- NFC 规范化
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---
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## 五、正则模式优先级
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`identifyDimensions()` 中的匹配顺序（先匹配先处理）：
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1. **PAT_COMPOUND_TOL** — 复合公差文本（如 `+0.03 0`）→ 跳过（不作为尺寸）
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2. **PAT_DIM_SYM_TOL** — 对称公差（如 `280 ±0.15`）
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3. **PAT_DIM_ASYM_TOL** — 非对称公差/斜线（如 `55 +0.03/-0.02`）
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4. **PAT_DIM_LIMIT_TOL** — 非对称公差/空格（如 `55 +0.03 -0.02`）
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5. **PAT_DIM_FIT** — 配合公差（如 `230 m6`、`280 H7`）
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6. **PAT_THREAD** — 螺纹标注（如 `M24×1.5`）
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7. **PAT_PLAIN_DIM** — 纯尺寸数值（如 `270`、`R15`）
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---
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## 六、关键文件
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| 文件 | 职责 |
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|-----|------|
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| `PositionedTextStripper.java` | PDFBox 文本提取、乱码修复、seqNum 赋值 |
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| `TextGrouper.java` | 按空间邻近性将 TextElement 分组为 TextGroup |
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| `TextNormalizer.java` | 二次乱码映射、NFC 规范化 |
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| `DimensionIdentifier.java` | 尺寸识别核心逻辑（正则 + Φ拼接 + 启发式） |
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| `TitleBlockFilter.java` | 标题栏区域过滤、GD&T/粗糙度排除 |
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| `RegionFilterService.java` | 区域框选模式尺寸提取 |
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| `PdfExtractionService.java` | 提取服务入口 |
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@ -1,8 +1,11 @@
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package extraction;
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import lombok.extern.slf4j.Slf4j;
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import model.DimensionResult;
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import model.TextElement;
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import model.TextGroup;
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import org.slf4j.Logger;
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import org.slf4j.LoggerFactory;
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import java.util.ArrayList;
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import java.util.HashSet;
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@ -11,31 +14,32 @@ import java.util.Set;
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import java.util.regex.Matcher;
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import java.util.regex.Pattern;
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@Slf4j
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public class DimensionIdentifier {
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// 尺寸 + 对称公差
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private static final Pattern PAT_DIM_SYM_TOL = Pattern.compile(
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"([ΦφØ∅]?\\s*\\d+\\.?\\d*)\\s*[±]\\s*(\\d+\\.?\\d*)");
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"([\u03A6\u03C6\u00D8\u2205\u2300]?\\s*\\d+\\.?\\d*)\\s*[\u00B1]\\s*(\\d+\\.?\\d*)");
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// 尺寸 + 非对称公差（斜线分隔）
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private static final Pattern PAT_DIM_ASYM_TOL = Pattern.compile(
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"([ΦφØ∅]?\\s*\\d+\\.?\\d*)\\s*([+-]\\d+\\.?\\d*)\\s*/\\s*([+-]\\d+\\.?\\d*)");
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"([\u03A6\u03C6\u00D8\u2205\u2300]?\\s*\\d+\\.?\\d*)\\s*([+-]\\d+\\.?\\d*)\\s*/\\s*([+-]\\d+\\.?\\d*)");
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// 尺寸 + 非对称公差（空格分隔）
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private static final Pattern PAT_DIM_LIMIT_TOL = Pattern.compile(
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"([ΦφØ∅]?\\s*\\d+\\.?\\d*)\\s+([+-]\\d+\\.?\\d*)\\s+([+-]\\d+\\.?\\d*)");
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"([\u03A6\u03C6\u00D8\u2205\u2300]?\\s*\\d+\\.?\\d*)\\s+([+-]\\d+\\.?\\d*)\\s+([+-]\\d+\\.?\\d*)");
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// 尺寸 + 配合公差代号
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private static final Pattern PAT_DIM_FIT = Pattern.compile(
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"([ΦφØ∅]?\\s*\\d+\\.?\\d*)\\s*([A-HJ-Zj-z]\\d{1,2})\\b");
|
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"([\u03A6\u03C6\u00D8\u2205\u2300]?\\s*\\d+\\.?\\d*)\\s*([A-HJ-Zj-z]\\d{1,2})\\b");
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// 螺纹标注（M型公制螺纹 + G型管螺纹 + Rc/NPT等）
|
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private static final Pattern PAT_THREAD = Pattern.compile(
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"(M\\d+\\.?\\d*(?:\\s*[xX×]\\s*\\d+\\.?\\d*)?|(?:G|Rc|Rp|NPT)\\s*\\d+(?:/\\d+)?)");
|
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"(M\\d+\\.?\\d*(?:\\s*[xX\u00D7]\\s*\\d+\\.?\\d*)?|(?:G|Rc|Rp|NPT)\\s*\\d+(?:/\\d+)?)");
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|
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// 独立公差文本
|
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private static final Pattern PAT_TOLERANCE = Pattern.compile(
|
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"[±]\\s*\\d+\\.?\\d*|[+-]\\s*\\d+\\.?\\d*");
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"[\u00B1]\\s*\\d+\\.?\\d*|[+-]\\s*\\d+\\.?\\d*");
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// 复合公差文本
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private static final Pattern PAT_COMPOUND_TOL = Pattern.compile(
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|
|
@ -43,7 +47,7 @@ public class DimensionIdentifier {
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|||
|
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// 纯尺寸数值
|
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private static final Pattern PAT_PLAIN_DIM = Pattern.compile(
|
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"([ΦφØ∅]\\s*\\d+\\.?\\d*|[Rr]\\d+\\.?\\d*|[Cc]\\d+\\.?\\d*|\\d+\\.\\d+|\\d+)");
|
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"([\u03A6\u03C6\u00D8\u2205\u2300]\\s*\\d+\\.?\\d*|[Rr]\\d+\\.?\\d*|[Cc]\\d+\\.?\\d*|\\d+\\.\\d+|\\d+)");
|
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|
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public List<DimensionResult> identifyDimensions(List<TextGroup> groups) {
|
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return identifyDimensions(groups, true);
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|
|
@ -74,7 +78,7 @@ public class DimensionIdentifier {
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if (TitleBlockFilter.isToleranceOnly(text)) continue;
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if (TitleBlockFilter.isSurfaceRoughness(text)) continue;
|
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if (TitleBlockFilter.isGdtTolerance(text)) continue;
|
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if (text.matches(".*\\d+\\.\\d+\\d+\\.\\d+.*") && !text.contains("±") && !text.contains("/")) continue;
|
||||
if (text.matches(".*\\d+\\.\\d+\\d+\\.\\d+.*") && !text.contains("\u00B1") && !text.contains("/")) continue;
|
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}
|
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// === 区域模式（!toleranceOnly）：不做内容过滤，直接进入模式匹配 ===
|
||||
|
||||
|
|
@ -90,8 +94,15 @@ public class DimensionIdentifier {
|
|||
// 1) 对称公差
|
||||
m = PAT_DIM_SYM_TOL.matcher(text);
|
||||
if (m.find()) {
|
||||
String d1 = m.group(1).trim();
|
||||
String sym1 = d1.matches("^[\u03A6\u03C6\u00D8\u00F8\u2205\u2300].*") ? ""
|
||||
: findLeadingSymbolGroup(g, groups, i, processed);
|
||||
// Heuristic: if no text-based Φ found, infer from fit tolerance context
|
||||
if (sym1.isEmpty()) {
|
||||
sym1 = inferDiameterFromContext(g, groups, text) ? "\u03A6" : "";
|
||||
}
|
||||
results.add(new DimensionResult(
|
||||
m.group(1).trim(), "±" + m.group(2), "dimension", g));
|
||||
sym1 + d1, "\u00B1" + m.group(2), "dimension", g));
|
||||
processed.add(i);
|
||||
continue;
|
||||
}
|
||||
|
|
@ -99,8 +110,14 @@ public class DimensionIdentifier {
|
|||
// 2) 非对称公差（斜线）
|
||||
m = PAT_DIM_ASYM_TOL.matcher(text);
|
||||
if (m.find()) {
|
||||
String d2 = m.group(1).trim();
|
||||
String sym2 = d2.matches("^[\u03A6\u03C6\u00D8\u00F8\u2205\u2300].*") ? ""
|
||||
: findLeadingSymbolGroup(g, groups, i, processed);
|
||||
if (sym2.isEmpty()) {
|
||||
sym2 = inferDiameterFromContext(g, groups, text) ? "\u03A6" : "";
|
||||
}
|
||||
results.add(new DimensionResult(
|
||||
m.group(1).trim(), m.group(2) + "/" + m.group(3), "dimension", g));
|
||||
sym2 + d2, m.group(2) + "/" + m.group(3), "dimension", g));
|
||||
processed.add(i);
|
||||
continue;
|
||||
}
|
||||
|
|
@ -108,8 +125,14 @@ public class DimensionIdentifier {
|
|||
// 3) 非对称公差（空格）
|
||||
m = PAT_DIM_LIMIT_TOL.matcher(text);
|
||||
if (m.find()) {
|
||||
String d3 = m.group(1).trim();
|
||||
String sym3 = d3.matches("^[\u03A6\u03C6\u00D8\u00F8\u2205\u2300].*") ? ""
|
||||
: findLeadingSymbolGroup(g, groups, i, processed);
|
||||
if (sym3.isEmpty()) {
|
||||
sym3 = inferDiameterFromContext(g, groups, text) ? "\u03A6" : "";
|
||||
}
|
||||
results.add(new DimensionResult(
|
||||
m.group(1).trim(), m.group(2) + " " + m.group(3), "dimension", g));
|
||||
sym3 + d3, m.group(2) + " " + m.group(3), "dimension", g));
|
||||
processed.add(i);
|
||||
continue;
|
||||
}
|
||||
|
|
@ -117,8 +140,19 @@ public class DimensionIdentifier {
|
|||
// 4) 配合公差
|
||||
m = PAT_DIM_FIT.matcher(text);
|
||||
if (m.find() && !text.contains("-") && !text.contains("/")) {
|
||||
String d4 = m.group(1).trim();
|
||||
String fitCode = m.group(2);
|
||||
String sym4 = d4.matches("^[\u03A6\u03C6\u00D8\u00F8\u2205\u2300].*") ? ""
|
||||
: findLeadingSymbolGroup(g, groups, i, processed);
|
||||
// Fit tolerance implies diameter, EXCEPT when fit code starts with
|
||||
// uppercase 'R' (which usually means Radius in engineering drawings)
|
||||
if (sym4.isEmpty() && !fitCode.startsWith("R")) {
|
||||
sym4 = "\u03A6";
|
||||
} else if (sym4.isEmpty()) {
|
||||
sym4 = inferDiameterFromContext(g, groups, text) ? "\u03A6" : "";
|
||||
}
|
||||
results.add(new DimensionResult(
|
||||
m.group(1).trim(), m.group(2), "dimension", g));
|
||||
sym4 + d4, fitCode, "dimension", g));
|
||||
processed.add(i);
|
||||
continue;
|
||||
}
|
||||
|
|
@ -146,7 +180,7 @@ public class DimensionIdentifier {
|
|||
}
|
||||
continue;
|
||||
}
|
||||
|
||||
|
||||
String numPart = dim.replaceAll("[^\\d.]", "");
|
||||
if (numPart.isEmpty()) continue;
|
||||
double val;
|
||||
|
|
@ -157,12 +191,12 @@ public class DimensionIdentifier {
|
|||
} catch (NumberFormatException e) {
|
||||
continue;
|
||||
}
|
||||
|
||||
|
||||
String nearbyTol = findNearbyTolerance(g, groups, i, usedAsTolerance);
|
||||
|
||||
|
||||
// toleranceOnly 模式下仅输出带公差的尺寸
|
||||
if (toleranceOnly && nearbyTol == null) continue;
|
||||
// 非 toleranceOnly 模式下，单字符无公差无Φ符号 → 输出完整文本（而非跳过）
|
||||
// 非 toleranceOnly 模式下，单字符无公差无\u03A6符号 → 输出完整文本（而非跳过）
|
||||
if (!toleranceOnly && nearbyTol == null && dim.length() == 1 && !hasNearbyPhiSymbol(g, groups)) {
|
||||
if (text.length() > 1) {
|
||||
results.add(new DimensionResult(text, null, "dimension", g));
|
||||
|
|
@ -170,9 +204,18 @@ public class DimensionIdentifier {
|
|||
}
|
||||
continue;
|
||||
}
|
||||
|
||||
|
||||
// Check if a standalone engineering symbol (\u03a6, \u00d8, etc.) sits
|
||||
// immediately to the LEFT of this number group. On Windows, PDFBox
|
||||
// often puts the symbol in a separate text run (separate writeString
|
||||
// call) because the garbled \u00a1\u00a4 chars come from a different
|
||||
// font than the number. After correction the symbol is a standalone
|
||||
// TextElement / TextGroup that TextGrouper may not merge because the
|
||||
// Y delta or X gap exceeds its thresholds. We handle it here instead.
|
||||
String leadingSymbol = findLeadingSymbolGroup(g, groups, i, processed);
|
||||
|
||||
// 区域模式下使用完整文本（含描述），toleranceOnly 模式只用尺寸值
|
||||
String dimText = (!toleranceOnly && text.length() > dim.length() + 3) ? text : dim;
|
||||
String dimText = (!toleranceOnly && text.length() > dim.length() + 3) ? text : leadingSymbol + dim;
|
||||
results.add(new DimensionResult(dimText, nearbyTol, "dimension", g));
|
||||
processed.add(i);
|
||||
continue;
|
||||
|
|
@ -188,12 +231,114 @@ public class DimensionIdentifier {
|
|||
return results;
|
||||
}
|
||||
|
||||
/**
|
||||
* Looks for a standalone engineering-symbol group (Φ, Ø, etc.) that sits
|
||||
* immediately to the LEFT of {@code dimGroup} on the same page. On Windows
|
||||
* PDFBox often produces these as separate writeString calls because the
|
||||
* garbled char sequence (e.g. ¡¤) comes from a different font / text-run
|
||||
* than the following numeric text. TextGrouper may fail to merge them due to
|
||||
* Y-delta or X-gap thresholds, so we handle the combination here.
|
||||
*
|
||||
* @return the symbol string (e.g. "Φ") if found, otherwise empty string
|
||||
*/
|
||||
private String findLeadingSymbolGroup(TextGroup dimGroup, List<TextGroup> allGroups,
|
||||
int dimIndex, Set<Integer> processed) {
|
||||
Set<String> symbols = Set.of(
|
||||
"\u03A6", "\u03C6", // Phi / phi - diameter
|
||||
"\u00D8", "\u00F8", // O-stroke uppercase / lowercase (\u00d8 / \u00f8)
|
||||
"\u2205", // empty-set - sometimes used for diameter
|
||||
"\u2300" // \u2300 - ISO/DIN standard diameter sign (most CAD software)
|
||||
);
|
||||
// Generous thresholds: the symbol (e.g. \u03a6 at fontSize=24) and the number
|
||||
// (e.g. "280" at fontSize=9) come from different fonts/text-runs, so their
|
||||
// X/Y coordinates may differ more than expected.
|
||||
//
|
||||
// IMPORTANT: we use the symbol's LEFT EDGE (other.getX()), NOT the right edge,
|
||||
// because the symbol TextElement width is computed from the original garbled
|
||||
// chars (e.g. \u00a1\u00a4 from BerlinSansFB-Bold) whose advance widths are
|
||||
// larger than the visual \u03a6 glyph. This inflated width makes
|
||||
// (symbolRight - dimGroup.getX()) negative even when the symbol visually
|
||||
// precedes the number.
|
||||
//
|
||||
// gapFromSymLeft = dimGroup.getX() - other.getX()
|
||||
// > 0 : symbol starts LEFT of the number (correct for "\u03a6NN")
|
||||
// = ~0 : symbol almost aligns with number start
|
||||
// < -3 : symbol starts to the RIGHT of the number (wrong, reject)
|
||||
float maxGapFromLeft = Math.max(dimGroup.getFontSize() * 5.0f, 70f);
|
||||
float maxYDelta = Math.max(dimGroup.getFontSize() * 3.0f, 40f);
|
||||
|
||||
String best = null;
|
||||
float bestDist = Float.MAX_VALUE;
|
||||
int bestIdx = -1;
|
||||
|
||||
for (int j = 0; j < allGroups.size(); j++) {
|
||||
if (j == dimIndex || processed.contains(j)) continue;
|
||||
TextGroup other = allGroups.get(j);
|
||||
if (other.getPageNum() != dimGroup.getPageNum()) continue;
|
||||
String t = other.getText().trim();
|
||||
if (!symbols.contains(t)) continue;
|
||||
|
||||
float symbolRight = other.getX() + Math.max(other.getWidth(), 1f);
|
||||
float gapFromRight = dimGroup.getX() - symbolRight; // kept for diagnostics
|
||||
float gapFromSymLeft = dimGroup.getX() - other.getX(); // reliable: not affected by inflated width
|
||||
float dy = Math.abs(other.getY() - dimGroup.getY());
|
||||
|
||||
// Compute seqNum for diagnostic logging
|
||||
int phiSeq = other.getElements().isEmpty() ? -1 :
|
||||
other.getElements().stream().mapToInt(TextElement::getSeqNum).min().orElse(-1);
|
||||
int dimSeq = dimGroup.getElements().isEmpty() ? -1 :
|
||||
dimGroup.getElements().stream().mapToInt(TextElement::getSeqNum).min().orElse(-1);
|
||||
|
||||
// Rendering-order filter: in AutoCAD PDFs, Φ symbols are rendered in an
|
||||
// early layer and dimension numbers in a much later layer.
|
||||
// Valid pairs have dimSeq - phiSeq >= 180.
|
||||
// This rejects same-layer false positives (e.g. "6" with seqDiff=7)
|
||||
// and cross-annotation false positives (e.g. "160" with seqDiff=173).
|
||||
if (phiSeq >= 0 && dimSeq >= 0 && (dimSeq - phiSeq) < 180) {
|
||||
continue;
|
||||
}
|
||||
|
||||
if (gapFromSymLeft >= -10f && gapFromSymLeft < maxGapFromLeft && dy < maxYDelta) {
|
||||
if (gapFromSymLeft < bestDist) {
|
||||
bestDist = gapFromSymLeft;
|
||||
best = t;
|
||||
bestIdx = j;
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if (best != null) {
|
||||
TextGroup bestGroup = allGroups.get(bestIdx);
|
||||
int bPhiSeq = bestGroup.getElements().isEmpty() ? -1 :
|
||||
bestGroup.getElements().stream().mapToInt(TextElement::getSeqNum).min().orElse(-1);
|
||||
int bDimSeq = dimGroup.getElements().isEmpty() ? -1 :
|
||||
dimGroup.getElements().stream().mapToInt(TextElement::getSeqNum).min().orElse(-1);
|
||||
log.info("findLeadingSymbolGroup: MATCHED [{}] for dim [{}] gapFromSymLeft={} dy={} "
|
||||
+ "phiSeq={} dimSeq={} seqDiff={} phiFs={} dimFs={} "
|
||||
+ "phiXY=({},{}) dimXY=({},{})",
|
||||
best, dimGroup.getText().trim(),
|
||||
String.format("%.1f", bestDist),
|
||||
String.format("%.1f", Math.abs(bestGroup.getY() - dimGroup.getY())),
|
||||
bPhiSeq, bDimSeq,
|
||||
(bPhiSeq >= 0 && bDimSeq >= 0) ? Math.abs(bPhiSeq - bDimSeq) : -1,
|
||||
String.format("%.1f", bestGroup.getFontSize()),
|
||||
String.format("%.1f", dimGroup.getFontSize()),
|
||||
String.format("%.1f", bestGroup.getX()),
|
||||
String.format("%.1f", bestGroup.getY()),
|
||||
String.format("%.1f", dimGroup.getX()),
|
||||
String.format("%.1f", dimGroup.getY()));
|
||||
processed.add(bestIdx);
|
||||
return best;
|
||||
}
|
||||
return "";
|
||||
}
|
||||
|
||||
private boolean hasNearbyPhiSymbol(TextGroup dimGroup, List<TextGroup> allGroups) {
|
||||
float searchDist = dimGroup.getFontSize() * 3.0f;
|
||||
for (TextGroup other : allGroups) {
|
||||
if (other.getPageNum() != dimGroup.getPageNum()) continue;
|
||||
String t = other.getText().trim();
|
||||
if (!t.equals("¡¤") && !t.equals("Φ") && !t.equals("φ") && !t.equals("Ø") && !t.equals("∅"))
|
||||
if (!t.equals("\u00A1\u00A4") && !t.equals("\u03A6") && !t.equals("\u03C6") && !t.equals("\u00D8") && !t.equals("\u2205"))
|
||||
continue;
|
||||
float dx = Math.abs(other.getX() - dimGroup.getX());
|
||||
float dy = Math.abs(other.getY() - dimGroup.getY());
|
||||
|
|
@ -202,6 +347,43 @@ public class DimensionIdentifier {
|
|||
return false;
|
||||
}
|
||||
|
||||
/**
|
||||
* Heuristic: infer that a dimension is a diameter based on context.
|
||||
* In engineering drawings, fit tolerance codes (H7, m6, r6, etc.) are ONLY
|
||||
* used for cylindrical features (shafts/holes). If the dimension text itself
|
||||
* contains a fit code, or a nearby TextGroup on the same page contains one,
|
||||
* we can safely infer it's a diameter.
|
||||
*
|
||||
* Fit tolerance pattern: single letter [A-Ha-h, j-z, J-N, P-Z] + 1-2 digits
|
||||
* (excludes 'I/i' which is not used in ISO fit system)
|
||||
*/
|
||||
private static final Pattern PAT_FIT_CODE = Pattern.compile(
|
||||
"(?:^|\\s)([A-Ha-hJ-Nj-zP-Z])(\\d{1,2})(?:\\s|$)");
|
||||
|
||||
private boolean inferDiameterFromContext(TextGroup dimGroup, List<TextGroup> allGroups, String normalizedText) {
|
||||
// 1) Check if the dimension text itself contains a fit code
|
||||
if (PAT_FIT_CODE.matcher(normalizedText).find()) {
|
||||
return true;
|
||||
}
|
||||
|
||||
// 2) Check nearby TextGroups for fit tolerance codes
|
||||
float searchX = 100f;
|
||||
float searchY = 50f;
|
||||
for (TextGroup other : allGroups) {
|
||||
if (other == dimGroup) continue;
|
||||
if (other.getPageNum() != dimGroup.getPageNum()) continue;
|
||||
float dx = Math.abs(other.getX() - dimGroup.getX());
|
||||
float dy = Math.abs(other.getY() - dimGroup.getY());
|
||||
if (dx > searchX || dy > searchY) continue;
|
||||
String ot = other.getText().trim();
|
||||
// Fit code TextGroups are typically short (2-3 chars like "H7", "m6")
|
||||
if (ot.length() >= 2 && ot.length() <= 3 && ot.matches("[A-Ha-hJ-Nj-zP-Z]\\d{1,2}")) {
|
||||
return true;
|
||||
}
|
||||
}
|
||||
return false;
|
||||
}
|
||||
|
||||
private String findNearbyTolerance(TextGroup dimGroup, List<TextGroup> allGroups,
|
||||
int dimIndex, Set<Integer> usedAsTolerance) {
|
||||
float effWidth = dimGroup.getWidth() > 0 ? dimGroup.getWidth()
|
||||
|
|
@ -258,7 +440,7 @@ public class DimensionIdentifier {
|
|||
|
||||
if (TitleBlockFilter.isGdtTolerance(otherText) && !bareSmallDecimal) continue;
|
||||
|
||||
if (other.getFontSize() <= dimGroup.getFontSize() * 0.9 || otherText.contains("±") || bareSmallDecimal) {
|
||||
if (other.getFontSize() <= dimGroup.getFontSize() * 0.9 || otherText.contains("\u00B1") || bareSmallDecimal) {
|
||||
|
||||
Matcher cm = PAT_COMPOUND_TOL.matcher(otherText);
|
||||
if (cm.matches()) {
|
||||
|
|
@ -286,7 +468,7 @@ public class DimensionIdentifier {
|
|||
}
|
||||
|
||||
if (bareSmallDecimal) {
|
||||
tolParts.add("±" + otherText);
|
||||
tolParts.add("\u00B1" + otherText);
|
||||
tolIndices.add(i);
|
||||
continue;
|
||||
}
|
||||
|
|
@ -296,8 +478,8 @@ public class DimensionIdentifier {
|
|||
if (!tolParts.isEmpty()) {
|
||||
usedAsTolerance.addAll(tolIndices);
|
||||
tolParts.sort((a, b) -> {
|
||||
boolean aPos = a.startsWith("+") || a.startsWith("±");
|
||||
boolean bPos = b.startsWith("+") || b.startsWith("±");
|
||||
boolean aPos = a.startsWith("+") || a.startsWith("\u00B1");
|
||||
boolean bPos = b.startsWith("+") || b.startsWith("\u00B1");
|
||||
return Boolean.compare(bPos, aPos);
|
||||
});
|
||||
return String.join(" / ", tolParts);
|
||||
|
|
|
|||
|
|
@ -1,23 +1,37 @@
|
|||
package extraction;
|
||||
|
||||
import lombok.Getter;
|
||||
import model.TextElement;
|
||||
import org.apache.pdfbox.pdmodel.PDPage;
|
||||
import org.apache.pdfbox.pdmodel.common.PDRectangle;
|
||||
import org.apache.pdfbox.text.PDFTextStripper;
|
||||
import org.apache.pdfbox.text.TextPosition;
|
||||
import org.slf4j.Logger;
|
||||
import org.slf4j.LoggerFactory;
|
||||
|
||||
import java.io.IOException;
|
||||
import java.util.ArrayList;
|
||||
import java.util.List;
|
||||
|
||||
public class PositionedTextStripper extends PDFTextStripper {
|
||||
@Getter
|
||||
|
||||
private static final Logger log = LoggerFactory.getLogger(PositionedTextStripper.class);
|
||||
|
||||
private final List<TextElement> elements = new ArrayList<>();
|
||||
private int seqCounter = 0;
|
||||
private int currentPage = 0;
|
||||
private float currentPageWidth = 0;
|
||||
private float currentPageHeight = 0;
|
||||
|
||||
public PositionedTextStripper() throws IOException {
|
||||
super();
|
||||
}
|
||||
|
||||
// @Override
|
||||
// protected void processTextPosition(TextPosition text) {
|
||||
// log.info("processTextPosition: {},unicode={},codes={},font={},embedded={},damaged={}"
|
||||
// , text, text.getUnicode(), text.getCharacterCodes(), text.getFont().getName(), text.getFont().isEmbedded(), text.getFont().isDamaged());
|
||||
// }
|
||||
|
||||
@Override
|
||||
protected void startPage(PDPage page) throws IOException {
|
||||
currentPage++;
|
||||
|
|
@ -33,12 +47,38 @@ public class PositionedTextStripper extends PDFTextStripper {
|
|||
super.writeString(text, textPositions);
|
||||
return;
|
||||
}
|
||||
// log.info("writeString: {}", text);
|
||||
|
||||
// Rebuild text from individual TextPositions and apply garbled-pattern corrections.
|
||||
StringBuilder sb = new StringBuilder();
|
||||
for (TextPosition tp : textPositions) {
|
||||
String u = tp.getUnicode();
|
||||
if (u != null) {
|
||||
sb.append(u);
|
||||
}
|
||||
}
|
||||
String correctedText = correctGarbledText(sb.toString());
|
||||
|
||||
// Log original vs corrected text at INFO level for diagnostics
|
||||
// log.info("writeString: raw=[{}] corrected=[{}]", text, correctedText);
|
||||
|
||||
// Debug: log each TextPosition's unicode with code points AND font name
|
||||
if (log.isDebugEnabled()) {
|
||||
for (TextPosition tp : textPositions) {
|
||||
String u = tp.getUnicode();
|
||||
if (u != null && !u.isEmpty() && u.charAt(0) > 0x7F) {
|
||||
String fn = tp.getFont() != null ? tp.getFont().getName() : "null";
|
||||
log.debug("TextPos: unicode={} codePoints={} fontSize={} font={}",
|
||||
u, toCodePoints(u), String.format("%.1f", tp.getFontSizeInPt()), fn);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
TextPosition first = textPositions.get(0);
|
||||
TextPosition last = textPositions.get(textPositions.size() - 1);
|
||||
|
||||
TextElement elem = new TextElement();
|
||||
elem.setText(text.trim());
|
||||
elem.setText(correctedText.trim());
|
||||
elem.setPageNum(currentPage);
|
||||
elem.setX(first.getX());
|
||||
elem.setY(first.getY());
|
||||
|
|
@ -49,10 +89,65 @@ public class PositionedTextStripper extends PDFTextStripper {
|
|||
elem.setPageHeight(currentPageHeight);
|
||||
|
||||
if (!elem.getText().isEmpty()) {
|
||||
elem.setSeqNum(seqCounter++);
|
||||
elements.add(elem);
|
||||
}
|
||||
|
||||
super.writeString(text, textPositions);
|
||||
}
|
||||
|
||||
/**
|
||||
* Correct common garbled text patterns produced by PDFBox on Windows.
|
||||
* <p>
|
||||
* When a PDF uses Symbol / engineering fonts, the glyph codes are
|
||||
* sometimes misinterpreted through the platform's default charset
|
||||
* (GBK on Chinese Windows, Latin-1 on Western Windows), producing
|
||||
* garbled character pairs or individual garbled chars.
|
||||
* <p>
|
||||
* Pair replacements are tried first; if the pair is split across
|
||||
* separate writeString() calls, individual char fallbacks apply.
|
||||
*/
|
||||
private String correctGarbledText(String text) {
|
||||
if (text == null || text.isEmpty()) return text;
|
||||
|
||||
String result = text
|
||||
// ---- Pair replacements (both chars in same writeString call) ----
|
||||
.replace("\u00a1\u00a4", "\u03a6") // ¡¤ -> Φ (diameter)
|
||||
.replace("\u00a1\u00e3", "\u00b0") // ¡ã -> ° (degree)
|
||||
.replace("\u00a1\u00c0", "\u00b1") // ¡À -> ± (plus-minus)
|
||||
.replace("\u00a6\u00b5", "\u03a6") // ¦µ -> Φ (variant)
|
||||
.replace("\u00a1\u00c1", "\u00b1") // ¡Á -> ± (variant)
|
||||
.replace("\uffc3n\uffc3", "\u03a6") // Mac garbled Φ
|
||||
.replace("\uffc3$\uffc3", "\u03a6") // Mac garbled Φ
|
||||
.replace("\ufffdn\ufffd", "\u00d8") // Mac garbled Ø
|
||||
// ---- Fallback: individual char replacements ----
|
||||
// When ¡¤ is split across separate writeString() calls,
|
||||
// each char appears alone. Standalone ¡ -> Φ, ¤ -> removed.
|
||||
.replace("\u00a1", "\u03a6") // ¡ -> Φ
|
||||
.replace("\u00a4", "") // ¤ -> removed
|
||||
// ---- Remove Unicode REPLACEMENT CHARACTER ----
|
||||
.replace("\ufffd", "");
|
||||
|
||||
// Diagnostic log at INFO level when a correction was made
|
||||
if (!result.equals(text)) {
|
||||
log.info("correctGarbledText: [{}] -> [{}]", toCodePoints(text), toCodePoints(result));
|
||||
}
|
||||
|
||||
return result;
|
||||
}
|
||||
|
||||
private static String toCodePoints(String s) {
|
||||
if (s == null) return "null";
|
||||
StringBuilder sb = new StringBuilder("[");
|
||||
for (int i = 0; i < s.codePointCount(0, s.length()); i++) {
|
||||
if (i > 0) sb.append(" ");
|
||||
sb.append(String.format("U+%04X", s.codePointAt(s.offsetByCodePoints(0, i))));
|
||||
}
|
||||
sb.append("]");
|
||||
return sb.toString();
|
||||
}
|
||||
|
||||
public List<TextElement> getElements() {
|
||||
return elements;
|
||||
}
|
||||
}
|
||||
|
|
|
|||
|
|
@ -3,13 +3,22 @@ package extraction;
|
|||
import model.TextElement;
|
||||
import model.TextGroup;
|
||||
|
||||
import java.util.ArrayList;
|
||||
import java.util.Collections;
|
||||
import java.util.Comparator;
|
||||
import java.util.List;
|
||||
import java.util.*;
|
||||
|
||||
public class TextGrouper {
|
||||
|
||||
/** Short engineering symbols that should merge with adjacent elements regardless of fontSize ratio. */
|
||||
private static final Set<String> ENGINEERING_SYMBOLS = Set.of(
|
||||
"\u03A6", "\u03C6", // \u03a6 / \u03c6 (Phi/phi - diameter)
|
||||
"\u00D8", "\u00F8", // \u00d8 / \u00f8 (O-stroke - diameter)
|
||||
"\u2205", // \u2205 (empty set - diameter)
|
||||
"\u2300", // \u2300 (⌀ - ISO/DIN standard diameter sign)
|
||||
"\u25A1", "\u25FB", "\u25AD", // square cross-section symbols
|
||||
"\u00B1", // \u00b1 (plus-minus)
|
||||
"\u00B0", // \u00b0 (degree)
|
||||
"\u00D7" // \u00d7 (multiply)
|
||||
);
|
||||
|
||||
public List<TextGroup> groupTextElements(List<TextElement> elements) {
|
||||
if (elements.isEmpty()) return Collections.emptyList();
|
||||
|
||||
|
|
@ -32,7 +41,14 @@ public class TextGrouper {
|
|||
|
||||
float maxFs = Math.max(current.getFontSize(), elem.getFontSize());
|
||||
float minFs = Math.min(current.getFontSize(), elem.getFontSize());
|
||||
if (maxFs > 0 && minFs / maxFs < 0.7f) {
|
||||
// Allow engineering symbols (\u03a6, \u00d8, \u00b1, etc.) to merge
|
||||
// with adjacent elements regardless of fontSize ratio. These symbols
|
||||
// are often rendered at a much larger fontSize than the dimension
|
||||
// numbers they belong to, but they must be in the same TextGroup for
|
||||
// the DimensionIdentifier regex patterns to match (e.g. "\u03a650\u00b10.1").
|
||||
boolean isSymbol = isShortEngineeringSymbol(current.getText())
|
||||
|| isShortEngineeringSymbol(elem.getText());
|
||||
if (maxFs > 0 && minFs / maxFs < 0.7f && !isSymbol) {
|
||||
merge = false;
|
||||
} else {
|
||||
boolean curEndsWithDigit = !current.getText().isEmpty()
|
||||
|
|
@ -83,4 +99,14 @@ public class TextGrouper {
|
|||
|
||||
return groups;
|
||||
}
|
||||
|
||||
/**
|
||||
* Check if the text is a short engineering symbol (1-2 chars) that should
|
||||
* be allowed to merge with adjacent elements regardless of fontSize ratio.
|
||||
*/
|
||||
private boolean isShortEngineeringSymbol(String text) {
|
||||
if (text == null || text.isEmpty()) return false;
|
||||
String trimmed = text.trim();
|
||||
return trimmed.length() <= 2 && ENGINEERING_SYMBOLS.contains(trimmed);
|
||||
}
|
||||
}
|
||||
|
|
|
|||
|
|
@ -1,16 +1,48 @@
|
|||
package extraction;
|
||||
|
||||
|
||||
import java.text.Normalizer;
|
||||
|
||||
public class TextNormalizer {
|
||||
|
||||
public static String normalizeText(String text) {
|
||||
return text
|
||||
.replace("\u00a1\u00a4", "\u03a6")
|
||||
.replace("\u00a1\u00e3", "\u00b0")
|
||||
.replace("\u00a1\u00c0", "\u00b1")
|
||||
.replace("\u00a6\u00b5", "\u03a6")
|
||||
.replace("\uffc3n\uffc3", "\u03a6")
|
||||
.replace("\uffc3$\uffc3", "\u03a6")
|
||||
.replace("\ufffdn\ufffd", "\u00d8")
|
||||
.replace("\ufffd", "");
|
||||
if (text == null || text.isEmpty()) return text;
|
||||
|
||||
String result = text
|
||||
// --- Mac-specific garbled sequences (original) ---
|
||||
.replace("\u00a1\u00a4", "\u03a6") // \u00a1\u00a4 (\u00a1\u00a4) -> \u03a6 (\u03a6)
|
||||
.replace("\u00a1\u00e3", "\u00b0") // \u00a1\u00e3 (\u00a1\u00e3) -> \u00b0 (\u00b0)
|
||||
.replace("\u00a1\u00c0", "\u00b1") // \u00a1\u00c0 (\u00a1\u00c0) -> \u00b1 (\u00b1)
|
||||
.replace("\u00a6\u00b5", "\u03a6") // \u00a6\u00b5 (\u00a6\u00b5) -> \u03a6 (\u03a6)
|
||||
.replace("\uffc3n\uffc3", "\u03a6") // \uffc3n\uffc3 -> \u03a6
|
||||
.replace("\uffc3$\uffc3", "\u03a6") // \uffc3$\uffc3 -> \u03a6
|
||||
.replace("\ufffdn\ufffd", "\u00d8") // \ufffdn\ufffd -> \u00d8
|
||||
|
||||
// --- Windows / GBK-specific garbled sequences ---
|
||||
// GBK encodes CJK chars as 2-byte sequences; when a PDF glyph
|
||||
// code is misread through GBK, it produces double-byte CJK chars
|
||||
// or Latin-1 pairs that differ from the Mac variants.
|
||||
.replace("\u03a6\u0080", "\u03a6") // trailing control char after Phi
|
||||
.replace("\u00d8\u0080", "\u00d8") // trailing control char after O-stroke
|
||||
.replace("\u00b1\u0080", "\u00b1") // trailing control char after plus-minus
|
||||
|
||||
// Windows-1252 / GBK mis-read of Symbol font glyph codes
|
||||
.replace("\u0086", "\u2020") // dagger (Symbol 0x86)
|
||||
.replace("\u0087", "\u2021") // double dagger (Symbol 0x87)
|
||||
.replace("\u0089", "\u2030") // per mille (Symbol 0x89)
|
||||
|
||||
// Common GBK garbled pairs for engineering symbols
|
||||
.replace("\u00c6\u00f8", "\u00d8") // \u00c6\u00f8 -> \u00d8
|
||||
.replace("\u00a1\u00c1", "\u00b1") // variant of \u00a1\u00c0
|
||||
|
||||
// --- Remove remaining garbage ---
|
||||
.replace("\ufffd", ""); // Unicode replacement char
|
||||
|
||||
// NFC normalization: canonical decomposition then recomposition
|
||||
// This standardizes characters that have multiple Unicode representations
|
||||
// (e.g., U+00C5 vs U+0041 U+030A for Å)
|
||||
result = Normalizer.normalize(result, Normalizer.Form.NFC);
|
||||
|
||||
return result;
|
||||
}
|
||||
}
|
||||
|
|
|
|||
|
|
@ -4,10 +4,13 @@ import lombok.Data;
|
|||
|
||||
@Data
|
||||
public class TextElement {
|
||||
|
||||
private String text;
|
||||
private int pageNum;
|
||||
private float x, y;
|
||||
private float width, height;
|
||||
private float fontSize;
|
||||
private float pageWidth, pageHeight;
|
||||
private int seqNum;
|
||||
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue