Shift features of cropped image

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Ömer Faruk Kurular
Ömer Faruk Kurular 2019-11-10
评论： Image Analyst 2019-11-10
I first detect face in an image and then extract features of face part. Then I wanto plot points on whole image but feature points are shifted as I found features on cropped image. How can I handle this issue?
face = imcrop(grayimage,[x,y,width,height]);
points = detectSURFFeatures(face);
imshow(I); hold on;
plot(points.selectStrongest(10));

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回答（1 个）

Image Analyst
Image Analyst 2019-11-10
You displayed the original image instead of the cropped face image. Try this:
face = imcrop(grayimage,[x,y,width,height]);
points = detectSURFFeatures(face);
imshow(face);
hold on;
plot(points.selectStrongest(10));
  2 个评论
Ömer Faruk Kurular
Ömer Faruk Kurular 2019-11-10
No I am extracting features from face but show points on whole image.
Image Analyst
Image Analyst 2019-11-10
Then you need to add x to the x values, and y to the y values since the (x,y) values you get from detectSURFFeatures will have the cropped image, not the original face, as the image/origin.

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