Multilevel Histogram thresholding

currently i am working on video files.Can you tell how to perform multilevel histogram thresholding on the gray scale images extracted from the video files?

Answer 1

[Image Analyst]

binaryImage = (grayImage < upperThreshold) & (grayImage > lowerThreshold);

[srikanth]

thank you

[srikanth]

Thanks, but i have to perform automatic thresholding

[Image Analyst]

So use an algorithm to pick the two thresholds.

[srikanth]

thanks,

i have to work on the threshold has to be updated automatically according to illumination changes to get the bright objects like vehicle headlights in a night time traffic scene efficiently. can u suggest any sample code for this.

[Image Analyst]

You can look here: http://fiji.sc/wiki/index.php/Auto_Threshold

You might look in this book: http://szeliski.org/Book/drafts/SzeliskiBook_20100818_draft.pdf