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Hysteresis Thresholding

version (2.13 KB) by Massimo Fierro
C implementation of Hysteresis Thresholding


Updated 27 May 2008

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This function takes as parameters a grayscale image (real valued matrix of size x*w*1) and two thresholds (low and high), and returns the hysteresis thresholded version.

Hysteresis thresholding performs the following:
- every value below tLo is set to 0
- every value above tHi is set to 1
- the rest of the pixels are set to 1 if they are 4-way connected to any other 1-valued blob (area), 0 otherwise

It should be pretty straightforward to implement an 8-way connection check, if you want.

To compile and use perform the following:
mex hysteresis.c

Cite As

Massimo Fierro (2021). Hysteresis Thresholding (, MATLAB Central File Exchange. Retrieved .

Comments and Ratings (6)

gaspard duchamp


I wasn't able to get this to work myself, but programing the functionality in Matlab is very easy

highmask = image>tHi;
lowmask = bwlabel(~(image<tLo));
final = ismember(lowmask,unique(lowmask(highmask)));


There seems to be only 1 set of forward-backward propagation set. It'd be nice if the code was extended to do recursively until nothing changes anymore as suggested on

I guess its really just putting the propagation part in a while loop with checking if any pixel switched from 0 to 1.

Great function otherwise!


make sure grayscale image is of type double

Priyanshu Agarwal

Hi when I compiled and executed this code, I got the following error. I invoked it as TI = hysthresh(GI,0.1,0.4), where GI is a grayscale image.

??? Error using ==> hysthresh
YPRIME requires that Y be a 4 x 1 vector.

I also tried commenting this part in the code and recompiling the code. However, it ran out of memory.

hamid afshang

MATLAB Release Compatibility
Created with R13
Compatible with any release
Platform Compatibility
Windows macOS Linux

Inspired: Circular Matrix computation

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