获取图像的一部分并将其放回Matlab的主图像中

Question

I have 2 mins video, I seprate each 1sec of this video and change it to 120 images. this image is too big and user can select some area of these images.I change my image matrix to to the vector and now I want to know index of the area which user selected?

after some process on that part, I want to put the changed image vector back to the main image.

I used ROI function but it didn't work, can any one help me with this problem?

Answer 1

Assume you have frame1 whose dimensions are R*C where R and C are the number of rows and columns, respectively.

User picked a rectangle region of interest; from r1 to r2 and from c1 to c2.

roi1=frame1(r1:r2,c1:c2)

will give you the roi you want. This operation copies the region of interest to roi1 . Then you can process this roi and copy it back to the original frame.

Another way is to play with frame1(r1:r2,c1:c2) which may be difficult if you are not careful and slightly slower if you are doing so many operations.