Exact black region detection in black and white image

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ronny3050
ronny3050 2016-4-11
回答： Image Analyst 2016-8-6
Hello,
Attached is a black and white image, I. I would like to detect the black regions in the image (for instance, the black piano keys). However, regionprops are not helping me because the regions aren't boxes. I would like to detect the exact boundaries of each key.
I appreciate all the help.
-Deb
Edit: I have looked at several demos and examples online such as the Image Segmentation demos by 'Image Analyst', however, I need the exact boundary, and not an approximate box.

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Walter Roberson
Walter Roberson 2016-4-11
The keys are not individual regions. Your only individual black regions the whole upper part, the whole bottom boundary, and a couple of dots that appear to be artifacts.
http://www.mathworks.com/help/images/boundary-tracing-in-images.html

更多回答（1 个）

Image Analyst
Image Analyst 2016-8-6
Deb:
The top black line can be detected by scanning every column to find the top, then just turn the next 20 pixels or so white. Then the black regions will be separated.
If it's still a problem, write back.

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