Finding black borders in image

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Alexander Bächi
Alexander Bächi 2022-3-21
回答： yanqi liu 2022-3-22
Hello community
I'm on a project on with I need to determine the beginning and the end of the top black border. I want this to tell the OCR from wich position the ROI begins.
From left to right I can see the black border in the plot of the sum of the bw image. But how can I "cut-off" the black part? Or at least determine how many pixels it has in height?
After the determination or crop, I'll set the ROI from 0 (or given offset) to a fixed value (size of the banner) to reduce the false information for the OCR.
Thanks in advance.

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回答（1 个）

yanqi liu
yanqi liu 2022-3-22
yes，sir，may be upload your image file，let's use the follow method
bw2 = ~imclearborder(~bw);
[r,c] = find(bw2);
bw2 = bw(min(r):max(r),min(c):max(c));
figure; imshow(bw2);

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