fix(sahi): Fix Polygon Repair and Empty Polygon Issues

[SunHao-AI]

• Added repair_polygon and repair_multipolygon functions to repair invalid polygons and multipolygons.
• Implemented coco_segmentation_to_shapely function to convert COCO format segmentation data into Shapely objects.
• Enhanced the get_union_polygon function to handle empty polygons using the newly implemented conversion and repair methods.

[Copilot]

PR Overview

This PR fixes issues related to invalid and empty polygons in SAHI by adding repair functions and converting COCO segmentation data into valid Shapely objects. It also enhances the union logic in mask processing and adds an inference image flag to the slicing functions.

• Added repair_polygon, repair_multipolygon, and coco_segmentation_to_shapely functions for polygon corrections.
• Updated get_merged_mask to handle empty polygons using the new conversion methods.
• Introduced an inference_org_image parameter to slicing functions to optionally include the original image in the output.

Reviewed Changes

File	Description
sahi/postprocess/utils.py	Added functions to repair invalid polygons and update union mask logic.
sahi/slicing.py	Added and propagated the inference_org_image parameter in slicing logic.

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

Comments suppressed due to low confidence (2)

sahi/slicing.py:89

• [nitpick] Consider using consistent naming for coordinate variables (e.g., use 'x_max' instead of 'xmax') to maintain clarity across the code.

xmax = min(image_width, x_max)

sahi/postprocess/utils.py:245

• [nitpick] Consider removing or simplifying decorative comment markers to maintain a clean and professional code style.

###################################################sunhao###################################################

[Copilot]

[nitpick] Consider removing or simplifying decorative comment markers to maintain a clean and professional code style.

Suggested change

	###################################################sunhao###################################################
	# Polygon repair functions

[fcakyon]

@SunHao-AI can you please fix the failing tests 🤗

[mario-dg]

@fcakyon, I need this fix, as it probably also addresses #1094 but with a cleaner implementation. Should I open a new PR, implement the changes and make sure the tests are running?

[SunHao-AI]

您能否修复失败的测试 🤗

def coco_segmentation_to_shapely(
    segmentation: Union[List, List[List]]
):
    """
    Fix segment data in COCO format

    :param segmentation: segment data in COCO format
    :return:
    """
    if isinstance(segmentation, List) and all([not isinstance(seg, List) for seg in segmentation]):
        segmentation = [segmentation]
    elif isinstance(segmentation, List) and all([isinstance(seg, List) for seg in segmentation]):
        pass
    else:
        raise ValueError("segmentation must be list or list[list]")

    polygon_list = []

    for coco_polygon in segmentation:
        point_list = list(zip(coco_polygon[::2], coco_polygon[1::2]))
        shapely_polygon = Polygon(point_list)
        polygon_list.append(repair_polygon(shapely_polygon))

    shapely_multipolygon = repair_multipolygon(MultiPolygon(polygon_list))
    return shapely_multipolygon

[SunHao-AI]

，我需要这个修复程序，因为它可能也解决了 #1094，但实现了更简洁。我应该打开一个新的 PR，实施更改并确保测试正在运行吗？

ok

[mario-dg]

@SunHao-AI, if you are already at it, you might just make the fix yourself, as you already posted the solution 😄