Eliminating the Border Around a Generated Image

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Sarah
Sarah 2018-8-27
评论： Sarah 2018-8-27
I am creating images using the rectangle() function with various line and space sizes. I attached an example image to this question. I want to eliminate the border of white that surrounds the black rectangles. (It affects my pixel count calculations.) Currently, I am just using the imcrop() function, but the cropping dimensions have to change according to the line and space sizes. Is there a more efficient way than imcrop()?

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jonas
jonas 2018-8-27
编辑：jonas 2018-8-27
There is a function that will do this for you in one step, but I forgot what it's called. Here's a primitive solution for you!
[y1,x1]=find(BW==0,1,'first')
[y2,x2]=find(BW==0,1,'last')
BW2=BW(y1:y2,x1:x2)
imshow(BW2)
Basically you find the upper left and bottom right corners, and then crop a rectangle between those.
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Image Analyst
Image Analyst 2018-8-27
Yep. 3 color channels - it's RGB. Try this first
BW = BW(:, :, 2); % Take green channel.
or else, if you want to keep it as a color image, do this:
BW2 = BW(y1:y2, x1:x2, :)

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