Crop and rotate face from example "Face Detection and Tracking Using the KLT Algorithm"

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OJ27 2015-11-16

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https://ww2.mathworks.cn/matlabcentral/answers/255186-crop-and-rotate-face-from-example-face-detection-and-tracking-using-the-klt-algorithm

回答： Walter Roberson 2015-11-16

I want to be able to crop and rotate an area of interest from an image bounded by a rotated rectangle. The code I am using is the one posted under "Face Detection and Tracking Using the KLT Algorithm". I tried using imcrop but it only allows to use straight rectangles.

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Answer 1

Walter Roberson 2015-11-16

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https://ww2.mathworks.cn/matlabcentral/answers/255186-crop-and-rotate-face-from-example-face-detection-and-tracking-using-the-klt-algorithm#answer_200085

MATLAB can only represent rectangular numeric matrices, so it is not possible to crop a rotated rectangle to its rotated edges. You can only crop it to its bounding box. You can set everything outside the area of interest to a value that your code knows to ignore, such as 0 or (if you are using floating point) NaN