Add perceptual (YIQ) image diff with anti-alias suppression#360
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Up to standards ✅🟢 Issues
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| Metric | Results |
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| Complexity | 24 |
| Duplication | 0 |
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image_differencecounts raw per-channel max-delta pixels andssim_compareis a global score — neither uses a perceptual colour metric nor ignores anti-aliased edges, the #1 source of false-positive visual-diff failures across DPI / font-hinting.perceptual_diff(AC_perceptual_diff): compares pixels in YIQ space (pixelmatch's colour metric) and by default removes thin 1px anti-aliased edge differences via a morphological open, so only solid changes count (include_aa=Truekeeps them). ReturnsPerceptualDiffResult(diff_pixels,total_pixels,diff_ratio,regions).assert_perceptual/ executormax_diff_ratio: gate a visual-regression test (raises over budget).color_region's RGB loader +cv2_utils.blobs.connected_boxes(no copies); injectable image pair → headless-testable (a 1px fringe → 0 diffs with AA suppression, a solid block → counted). Base OpenCV. Wired through all 5 layers + headless test + EN/Zh docs + WHATS_NEW. Qt-free.