How can I find threshold value for an image ?

Hi,I want to find threshold of an gray image so please provide some codings regarding it.

[Rik]

binIM=IM<128;

or

binIM=IM>100;

Have a read here and here. It will greatly improve your chances of getting an answer.

Answer 1

[Image Analyst]

There are a variety of ways. You can use the Otsu method, like in graythresh() or imbinarize(). I tend to like the triangle threshold method, like my attached code.

You can also use the interactive visual thresholding application in my File Exchange: https://www.mathworks.com/matlabcentral/fileexchange/?term=authorid%3A31862&sort=downloads_desc

Answer 2

[Nilesh Raghavan]

binIM=IM>100;