Multilayer region growing algorithm not working

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Hi,
I am trying to implement the multilayer topographic region growing algorithm for breast tumor segmentation. TM 250.jpg is the original image. Unfortunately, I am getting a complete black image as shown in the figure r.jpg below. Any suggestions would be appreciated.
I= rgb2gray((imread('TM250.jpg')));
x=64; y=64;
J=regiongrowing_MLT(I,x,y,0.5);
imshowpair(I,J,'montage')

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