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AnyImage/docs/internals/operators/rectify.md
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# Rectify 透视校正
`operators/rectify_tool/operators.py` 定义 `RectifyImagePerspective` 与 `RectifyTool`,将图片内的四角区域校正为矩形。`geometry.py` 负责四角验证与像素校正,`preview.py` 负责预览图、Overlay 和宽高比控制,`__init__.py` 导出类型及注册清单。
```mermaid
flowchart TD
A[点选四角] --> B[规范为凸 Quad 并检查图片交叠]
B --> C[512×512 预览与宽高比调整]
C --> D[按像素密度和输出上限确定尺寸]
D --> E[分块 Homography 与预乘 Alpha 插值]
E --> F[按可见 Alpha 裁剪]
F --> G[映射 placement bounds 并替换 Packed Image]
```
四角允许任意点击顺序,退化或非凸输入在提交前校验。预览根据源颜色空间配置显示,像素重采样复用 `common/image.py`。输出最长边上限 8192,总像素上限 16,777,216。
`replace_empty_image()` 根据校正区域的 placement bounds 调整画框,保留源 Image 名称、对象身份和共享引用语义。