rs.png'),[480 640]); pChns=chnsCompute();
  hFunc=@(I) 5*sqrt(max(0,max(convBox(I.^2,2)-convBox(I,2).^2,[],3)));
  pChns.pCustom=struct('name','Std02','hFunc',hFunc); pChns.complete=0;
  tic, chns=chnsCompute(I,pChns); toc
  figure(1); im(chns.data{4});

 See also <a href="rgbConvert.html" class="code" title="function J = rgbConvert( I, colorSpace, useSingle )">rgbConvert</a>, <a href="gradientMag.html" class="code" title="function [M,O] = gradientMag( I, channel, normRad, normConst, full )">gradientMag</a>