how to convert image to binary based on histogram
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I need help in converting an image to binary based on histogram. is there a function to do that in matlab? I know there is a function called im2bw(image, thresholdLevel) I could use that but how do I get the level? do I choose something from the histogram?
Thanks
回答（2 个）
Image Analyst
2011-12-18
0 个投票
Use graythresh(), or try my thresholding app: http://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862
Avishek
2011-12-18
0 个投票
there are several means of automatic thresholding. kmeans, ostu are the most popular if you want to do the thresholding manually
1) plot the histrogram using imhist()
2) find the point in the x-axis of histrogram that seems to divide the histrogram into two parts
if u choose to do it automatically
1) graythresh() gives you ostu thresholding
2)kmeans(), for clustering, this function has various options. you can modify it a bit to get what type of threshold you want.
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