Ошибка в программе для встраивания ЦВЗ

inp_image=imread('CamaroSS.bmp');
Water_image=imread('water.bmp');
key_image=imread('water_key.bmp');
[xSize,ySize]=size(inp_image);
q=2;
figure, imshow (inp_image)
figure, imshow (Water_image)
figure, imshow (key_image)
 
inp_image=double(inp_image);
count=0;
for i=1:xSize
for j=1:ySize
if (key_image(i,j)==1 )
count=count+1;
if (rem(count,ySize)==0)  a=ySize; elsea=rem(count,ySize); end;
if (Water_image( floor(count/ySize)+1,a)==1)
new_image(i,j)= 2*q*floor((inp_image(i,j)-q/2)/(2*q))+q/2;
elsenew_image(i,j)= 2*q*floor((inp_image(i,j)-q/2)/(2*q));  end; % good
elsenew_image(i,j)=inp_image(i,j);
end;
end;
end;
%new_image=histeq(new_image);
figure, imshow (uint8(new_image))
new_image=uint8(new_image);
count=0;
for i=1:xSize
for j=1:ySize
if   (rem(new_image(i,j),q)<q/2) &&((key_image(i,j)==1 ))
count=count+1;
if (rem(count,ySize)==0)  a=ySize; elsea=rem(count,ySize); end;
Water_image2(floor(count/ySize)+1,a)=0;
end;
if   (rem(new_image(i,j),q)>=q/2) &&((key_image(i,j)==1 ))
if (rem(count,ySize)==0)  a=ySize; elsea=rem(count,ySize); end;
count=count+1;   Water_image2(floor(count/ySize)+1,a)=1;  
end;
end;
end;
figure, imshow (Water_image2)