Image.draw_* fail on images from Image.Read: pixel data is not C-contiguous (cv2 line/circle/putText layout error)
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已经有一个关联 PR 被合并了。
- #162 来自 @petercorke —— 已合并
评估
- 难度
- 3/5
- 预计耗时
- 1-2 天
- 新手友好度
- 35/100
- Issue 类型
- 缺陷
- 描述清晰度
- 描述清楚
- 活跃度
- 停滞
- 技术栈
- opencv, python
调研方向
Start in base/graphics.py, where draw_point calls cv2.putText, and inspect the other draw_* functions that pass the image to OpenCV drawing calls. Reproduce with the issue's Image.Read("monalisa.png") example and check the array's contiguity; add the requested regression test for drawing text on an image read this way. Done when the drawing call succeeds on OpenCV 5 and the regression test passes; pull request #162 is already open.
由索引模型根据 Issue 内容生成。
描述
On OpenCV 5.0, Image.draw_point(..., text) raises when the image comes straight from Image.Read. This breaks the example in its own docstring, so the published docs show a traceback.
Reproduce
OpenCV 5.0.0 (also 5.0.0.93 from PyPI), origin/main at 77a3da9c:
from machinevisiontoolbox import Image
img = Image.Read("monalisa.png")
img.draw_point((270, 194), "+", "eye", fontsize=1, color="yellow")
File ".../machinevisiontoolbox/base/graphics.py", line 782, in draw_point
cv2.putText(
cv2.error: OpenCV(5.0.0) :-1: error: (-5:Bad argument) in function 'putText'
> Overload resolution failed:
> - Layout of the output array img is incompatible with cv::Mat
> - Expected Ptr<cv::UMat> for argument 'img'
Likely cause
The array that Image.Read returns is not C-contiguous. For monalisa.png it has shape (700, 677, 3), strides (677, 1, 473900) and flags["C_CONTIGUOUS"] == False: the memory is planar (channel-first) and the Image holds a transposed view. cv2.putText on 5.0 rejects an output array in that layout.
Not yet checked:
- whether OpenCV 4 accepts it (the test machines used here all had OpenCV 5.0.0);
- why
Image.Readproduces a planar layout; - whether the other
draw_*functions inbase/graphics.pythat pass the image tocv2drawing calls fail the same way.
Fix ideas
- Make the
draw_*functions work on a contiguous copy and write the result back (or return it), or - have
Image.Read/Imageconstruction keep arrays C-contiguous, which is the more general fix but touches more code.
Whichever is chosen, add a regression test that draws text onto an Image.Read image on OpenCV 5 (the existing suite passes on 4 and 5, so it does not exercise this path).
Found while investigating broken examples in the docs build; see the tech-debt issue #159.
- 主要语言
- Python
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petercorke/machinevision-toolbox-python#151 ·
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