Difference between graythresh and multithresh for one value of threshold.

graythresh(I) and multithresh(I,1) gives me different values even if both are based on otsu's method of thresholding Why?

Answer 1

[Amir Xz]

 t1 = multithresh(I,1);
 t2 = graythresh(I);

t1 is a LEVEL, which means is a number between 0 to 255.

t2 is same LEVEL that mapped in [0 1].

In other word:

 t1 == uint8(256*t2)

[D_coder]

i dont think it is right cause for the data that i use t1 is something 1e+09 while t2 is something in single digit

[Amir Xz]

I gave you an example for an 8-bit digital image.

Example: Check it for 'coins.png' image.

What kind of image that you use?

[Amir Xz]

It's a complex image. For more information: https://www.imageeprocessing.com/2015/03/how-to-read-image-file-or-complex-image.html

I don't know about this kind of images.