Split image using a predefined line
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Is there anyway to split an image into two using a predefined line that passes through an object's centroid. I have already found the centroid and plotted the line, but I am unsure of how to separate the image using this line. Many Thanks
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Accepted Answer
Image Analyst
on 2 May 2014
Sure. I'm going to assume the line cuts across the entire image. Then use poly2mask() to create a binary image.
mask = poly2mask(x, y);
Then you can either blacken above/below the line.
imageAbove = grayImage;
imageAbove(mask) = 0;
imageBelow = grayImage;
imageBelow(~mask) = 0;
You can also crop to the bounding box or leave it at the original size, using imcrop() or regular indexing.
5 Comments
Image Analyst
on 3 May 2014
Ben, it's just simple algebra. I simply used the point slope formula for a line. See attached test3.m file to produce the image below.
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