how to convert ROI into zero values.

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Piyum Rangana 2017-2-21

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https://ww2.mathworks.cn/matlabcentral/answers/326210-how-to-convert-roi-into-zero-values

回答： Image Analyst 2017-4-1

Capture.png

I have colored image with a damaged region(ROI). I want to convert the pixel values of damaged area into zero values. AN example output needs to be like the attached one below What is the process should i follow ?

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Peter O 2017-2-21

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How is your ROI defined and what is the structure of your image data? If the image is a grayscale matrix, it should be as straightforward as identifying the indices of the ROI, then

A(idces) = 0

If your ROI is a rectangle of the form [x0 y0 w h] you could use the meshgrid command to get the coordinates and, optionally, convert them to the single-index form I used above. (You could also use A(X,Y) = 0)

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