connected component labeling like bwlabel

recursive function of labeling binary image 4 connected

this function start with one pixel and if it is 1 it finds all neighboors in the 4 connected and give them same label then for each call itself
some issue in big images it is limited to recursion of 500 , so i supose for implementing it in c++ may cause for some stack overflow , one solution is just to resize the image to smaller image use imresize , enjoy