Crop an image using multiple coordinates

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YIYANG WANG
YIYANG WANG 2018-7-7
编辑： Matt J 2018-7-7
I used the "imfreehand" to crop an irregular shape and save its positions into a variable. This position variable is a 85*2 double matrix (85 points, X and Y coordinates). Now, I want to use the same position to crop another image (different layer of the image, but the location of the objects is the same). The functions I can find all requires rectangle positions (X1,X2,Y1,Y2). In my situation, I have 82 different (X,Y) coordinates, how can I use the position information to crop a new image?

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采纳的回答

Matt J
Matt J 2018-7-7
编辑：Matt J 2018-7-7
You should save the original imfreehand object, h.
h=imfreehand(_____)
Then you can just do
cropped = double(AnotherImage).*h.createMask

更多回答（2 个）

Image Analyst
Image Analyst 2018-7-7
See my freehand copy and paste demo. It will be easy for you to adapt it.
Image Analyst
Image Analyst 2018-7-7
"I want to crop another image (different layer of the image)." Perhaps you want to mask all the layers/slices of this or another image. So use bsxfun:
% Mask the image using bsxfun() function to multiply the mask by each channel individually.
maskedRgbImage = bsxfun(@times, rgbImage, cast(mask, 'like', rgbImage));
rgbImage can be a color image, or a volumetric (multi-slice) image.

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