How can I transform an image to match with a 2D array?

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Scott Chung 2018-10-31

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回答： Geoffrey Schivre 2018-11-1

Hello, I want to transform an image (rotate, shrink,...) automatically to match with a 2D array.

The 2D array matrix has similar profile of the image (with very low resolution). This is the 2D array I have, and plotted using pcolor.

The following is the image I want to transform to match to the matrix.

My final goal is to find out the region circled in green in the image on the matrix. After matching the two, I plan to use roipoly to select the region on matrix.

If you have any comments or suggestions, it would be appreciable.

Thanks in advance.

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Answer 1

Geoffrey Schivre 2018-11-1

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Hello,

Here is how I would do it : I first start to binarize both images. To do so use the image segmenter app if you have it or use line like :

BW = imfill(myMatrix > someThreshold,'holes');

Then use imregcorr function with your two binary image to find the geometric transformation between them. If you don't have the computer vision toolbox you can try this https://fr.mathworks.com/matlabcentral/fileexchange/19731-fourier-mellin-image-registration.