There is a recursive way of finding threshold in the image using histogram that are biomodal, and is as follows:
An automated procedure for bimodal histograms :
- Select an initial estimate of T
- Compute the means of the two regions determined by T
- Set the new T as the average of the two means
- Repeat steps 2,3 until the difference in T in successive iterations is smaller than a predefined parameter
I have an old exam question below and I dont know how to solve it. all I know the T is $114$ and if this also helps total number of pixels are area first triangle+are of second triangle area + 4000 pixels. I am stuck on how to calculate step 2 to get me going.
Old Exam Question
explain why the isodata threshold of image is equal to $114$.