i want to perform average thresholding

RGB =imread('mammogram.jpg');
hsv=rgb2hsv(RGB);
imshow(hsv);
i= 0:20:240;
r1=0.1;
r2=0.85;
s= 0.8;
wgray1= 1-s.^(r1*(255./i).^r2);
i= 0:20:240;
r1= 0.1;
r2=0.85;
s=0.0;
wgray2= 1-s.^(r1*(255./i).^r2);
i= 0:20:240;
r1=0.1;
r2=0.85;
s=0.2;
wgray3= 1-s.^(r1*(255./i).^r2);
i= 0:20:240;
r1=0.1;
r2= 0.85;
s=0.4;
wgray4= 1-s.^(r1*(255./i).^r2);
i= 0:20:240;
r1=0.1;
r2=0.85;
s=0.6;
wgray5= 1-s.^(r1*(255./i).^r2);
i= 0:20:240;
r1=0.1;
r2=0.85;
s=1.0;
wgray6= 1-s.^(r1*(255./i).^r2);
level= graythresh(wgray1+wgray2+wgray3+wgray4+wgray5+wgray6);
BW= im2bw((wgray1+wgray2+wgray3+wgray4+wgray5+wgray6),level));
imshow(BW);

[Geoff Hayes]

kalyani - you have provided some code and the statement i want to perform average thresholding. How is the code related to the problem that you are trying to solve? Was the code written by you? Are you observing any errors, and if so, what are they? Please clarify what it is you want help with. Attach an image (probably the one mentioned in the code) and indicate what it is you expect the code to do.

[kalyani ohri]

Dear Sir yes the code was written by me .I have performed gray thresholding but the results are not so obtained that i needed. So base paper which i am following have performed average thresholding so i need mcode for average thresholdingf

[kalyani ohri]

This image i have taken

[kalyani ohri]

Answer 1

[Image Analyst]

I don't know what that is. It must be some name the author invented specially for his algorithm. You can try my interactive/visual thresholding app: http://www.mathworks.com/matlabcentral/fileexchange/29372-thresholding-an-image