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fix: 🐛 improve image handling in read_image_as_pil for CHW format #1287

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Merged
onuralpszr merged 5 commits into from
Nov 25, 2025
Merged

fix: 🐛 improve image handling in read_image_as_pil for CHW format #1287

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a16fd05
fix: 🐛 improve image handling in read_image_as_pil for CHW format
onuralpszr Nov 25, 2025
f8cf1f4
Merge branch 'main' into fix/read_image_as_pil_chw_format
onuralpszr Nov 25, 2025
2c1a1a8
Merge branch 'main' into fix/read_image_as_pil_chw_format
onuralpszr Nov 25, 2025
16a2d97
docs: 📝 add bug fixes and improvements report detailing issues and re…
onuralpszr Nov 25, 2025
856b3bf
Merge branch 'main' into fix/read_image_as_pil_chw_format
onuralpszr Nov 25, 2025
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8 changes: 6 additions & 2 deletions sahi/utils/cv.py
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Original file line number Diff line number Diff line change
Expand Up @@ -204,8 +204,12 @@ def read_image_as_pil(image: Image.Image | str | np.ndarray, exif_fix: bool = Tr
else:
raise TypeError(f"image with shape: {image_sk.shape[3]} is not supported.")
elif isinstance(image, np.ndarray):
if image.shape[0] < 5: # image in CHW
image = image[:, :, ::-1]
# check if image is in CHW format (Channels, Height, Width)
# heuristic: 3 dimensions, first dim (channels) < 5, last dim (width) > 4
if image.ndim == 3 and image.shape[0] < 5: # image in CHW
if image.shape[2] > 4:
# convert CHW to HWC (Height, Width, Channels)
image = np.transpose(image, (1, 2, 0))
image_pil = Image.fromarray(image)
else:
raise TypeError("read image with 'pillow' using 'Image.open()'")
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