I would like to define a region of interest and then count the number of pixels in it, as well as do various calculations on the region. The region of interest (ROI) could be either a rectangle or an irregular shape.
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There are three different ways this can be achieved. The three examples are shown below:
%%Method 1: Sets image to be transparent except the ROI I = imread('peppers.png'); image(I); axis off; disp('please selct the Region Of Interest') ROI = roipoly(I); % select a closed polygon myImage = findall(gcf,'type','image'); set(myImage,'AlphaData',ROI);
Method 2
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