Hi, <div> I'm using itk's builtin adaptive histogram equalization to equalize an image(3000*3000 in size), with the default arguments the process seems to run forever. However if I use matlab's adaptivehisteq function the result returns immediately. After googling I find that matlab uses an algorithm called contrast limited AHE, while itk uses the original AHE. The difference is that the former process the image block by block while the latter processes the image globally.(not sure how really it works). So, am I stuck? Or is there a way to use CLAHE in itk? The current AHE in itk is really slow, any suggestions?</div>