Hey - 我在这里给出了一些整体性的反馈：

• 在 ColorFilterConfig 中，建议使用与 ColorMatcherParam::method 相同的类型（或显式使用 cv::ColorConversionCodes 枚举），而不是使用带有魔法默认值 4 的原始 int 类型，以降低转换代码出错的可能性，并让其更具自说明性。
• 在 PipelineTask::try_add_ocr_node 中，带有 color_filter 的 OCR 节点会被静默地排除在批处理优化之外；添加一条简短注释来解释这一行为，将有助于未来的维护者理解为什么这里需要提前返回。

Please address the comments from this code review:

## Overall Comments
- In `ColorFilterConfig`, consider using the same type as `ColorMatcherParam::method` (or an explicit `cv::ColorConversionCodes` enum) instead of a raw `int` with a magic default `4`, to make the conversion code less error‑prone and self‑documenting.
- In `PipelineTask::try_add_ocr_node`, OCR nodes with `color_filter` are silently excluded from batch optimization; adding a brief comment explaining this behavior would help future maintainers understand why the early return is necessary.

Please address the comments from this code review:

## Overall Comments
- In `ColorFilterConfig`, consider using the same type as `ColorMatcherParam::method` (or an explicit `cv::ColorConversionCodes` enum) instead of a raw `int` with a magic default `4`, to make the conversion code less error‑prone and self‑documenting.
- In `PipelineTask::try_add_ocr_node`, OCR nodes with `color_filter` are silently excluded from batch optimization; adding a brief comment explaining this behavior would help future maintainers understand why the early return is necessary.

Pull request overview

This PR adds a color_filter field to the OCR recognition type in the pipeline protocol, allowing OCR nodes to reference a ColorMatch node and apply its color binarization logic before performing OCR recognition. This is useful for improving OCR accuracy on images with specific color patterns by preprocessing them with color-based filtering.

Changes:

• Added color_filter field to OCR recognition parameters across the entire codebase (C++, bindings, schema, documentation)
• Implemented color filtering logic in OCRer that applies ColorMatch node's color parameters to binarize images before OCR
• Excluded OCR nodes with color_filter from batch optimization to maintain per-node filtering correctness

Reviewed changes

Copilot reviewed 13 out of 14 changed files in this pull request and generated no comments.