how can i write an algorithm to find the pixel values of finger tips

Dear all, my final year project is titled, 'hand shape recognition'. so far after passing through the preprocessing, i used canny to get the edge of the hand shape, and then used bwboundary to obtain the pixel values of all the boundaries.

my algorithm so far is as follow;

I = imread('P1020814.jpg');

I = imresize(I,[525,382]);

a = rgb2gray(I);

level = graythresh(a);

BW = im2bw(a, level);

SE = strel('disk',7);

BW = imclose(BW,SE);

b = wiener2(BW);

c = edge(b,'canny');

%Feature Extraction [B,L] = bwboundaries(c,'noholes');

Please i need to write an algorithm that will find the pixel values (row and column) of the finger tips.

Any help and suggestion will be appreciated.

Best umoh