Fast Kuwahara Filter

Fast Kuwahara edge preserving Filter

Description

Fast Kuwahara edge preserving Filter.
as compared to submission:kuwahara.m"
http://www.mathworks.com/matlabcentral/fileexchange/loadFile.do?objectId=8171&objectType=FILE
on 480X640 image and window=5 (L=1), this filter was 38 times faster
(1.51 sec vs 57.6 sec). Also this
submission output correct (same) image size

• MATLAB release: MATLAB 7.2 (R2006a)
• Other requirements: it needs array pad function array_padd.m from FEX

[Anup K]

the execution halts on an error:

Y=KuwaharaFast(imbw,1);
??? Error using ==> minus
Integers can only be combined with integers of the same class, or scalar doubles.

Error in ==> var at 86
            x0 = x - repmat(xbar, tile);

Error in ==> colfilt at 183
        b(i*mb+brows,j*nb+bcols) = ...

Error in ==> KuwaharaFast at 49
VarArray = colfilt(d,[R,R],'sliding',@var);

[Sergei Koptenko]

Dear Anup
If you look closely into the error description you'll see that the error happens in colfilt function which is a MATLAB function not mine. The description of error suggest that you have problem in your data array (mixing up different classes of data in the same array?). Please check your data before blaming the Matlab.

Best Regards
Sergei

[Anup K]

Sergei:
The problem was that I was passing a uint8 image instead of passing a double. Works great now..
thanks
anup

[Sergei Koptenko]

Hi Anup
Thanks for the debugging. I uploaded the updated file that would check for the type of the input data and convert them to double if necessary. The update will appears in the few day on FEX