finding transition region of an image

sir,

for my miniproject work on image processig i need to calculate the transition region using local variance and global threshold. is there any function available for this?

plese reply

Answer 1

[Siriniharika Katukam]

Hi

I understand from your question that you need to compute the variance of part of image and then use a global threshold for finding the transition regions.

The variance of an image can be found by using the function “var”.

Variance = var(img(:));

The above line of code would calculate the variance of the input( image or a selected region of image).

For global thresholding, you can use the function “graythresh” of Image Processing Toolbox.

Here are few links that would be helpful:

https://www.mathworks.com/matlabcentral/answers/154471-how-to-find-the-variance-of-an-image

https://www.mathworks.com/help/images/ref/graythresh.html