My code is showing error " matrix dimension must agree".In line no -4 (2nd function:function [res_img]=​Gray_trans​_S_curve_u​int16(xyz)​)-nrm_val= (xyz)- mn1;.output of the 1st function will be used in 2nd function.1st fn :function Res=Local_Process_uin

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function Res=Local_Process_uint16_mymod(inputImage,nblockrow,nblockcolumn) [m,n] = size(inputImage); dcol = fix(n/nblockcolumn); drow = fix(m/nblockrow); for index = 1:nblockrow* nblockcolumn
[r,c] = ind2sub([nblockrow,nblockcolumn],indexa );
if (r==nblockrow && c~=nblockcolumn)
subimage = inputImage((r-1)*drow+1:r*drow+rem(m,nblockrow), (c-1)*dcol+1:c*dcol,:);
elseif (r~=nblockrow && c==nblockcolumn)
subimage = inputImage((r-1)*drow+1:r*drow, (c-1)*dcol+1:c*dcol+rem(n,nblockcolumn),:);
elseif (r==nblockrow && c==nblockcolumn)
subimage = inputImage((r-1)*drow+1:r*drow+rem(m,nblockrow), (c-1)*dcol+1:c*dcol+rem(n,nblockcolumn),:);
else
subimage = inputImage((r-1)*drow+1:r*drow, (c-1)*dcol+1:c*dcol,:);
end;
subimage;
test_th=Gray_trans_S_curve_uint16(double(subimage));
Box_new{r,c}=test_th;
subimage=[];
end
Res=cell2mat(Box_new); % figure,imshow(Res,[]); % 2nd function
function [res_img]=Gray_trans_S_curve_uint16(xyz) mn1 = min(xyz(:)); mx1=max(xyz(:)); mxl nrm_val= (xyz)- mn1; diff = (mx1-mn1); res=[]; res_img=[]; xyz_norm = nrm_val ./ diff;
[m,n]=size(xyz_norm);
for i=1:m for j=1:n res(i,j)=(0.9642)+((8.594*10^-4-0.9642)/(1+exp((xyz_norm(i,j)-0.4969)/0.07598))); end; end;
res_img=uint16(((mx1-mn1)*res)+mn1);
%endThe attached file contains contrast enhancement code. function Res=Local_Process_uint16_mymod(inputImage,nblockrow,nblockcolumn) will take input as image and size of blocks of subimage.Output of the image will be sed in another function name:function [res_img]=Gray_trans_S_curve_uint16(xyz). but it is showing error. example:function Res=Local_Process_uint16_mymod('mrimage.bmp',40,40) objective: The function function Res=Local_Process_uint16_mymod(inputImage,nblockrow,nblockcolumn) will take input image and divide the image into non overlapping blocks. after that each block will be given as input to the function [res_img]=Gray_trans_S_curve_uint16(xyz) to perform contrast enhancement. but in line no 4 it is showing error Marix dimenson must agree.%
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Accepted Answer

Majid Farzaneh
Majid Farzaneh on 10 Jun 2018
If your input is an image it's incorrect to use it like this:
Res=Local_Process_uint16_mymod('mrimage.bmp',40,40)
'mrimage.bmp' is a string not an image. You should first read the image:
I=imread('mrimage.bmp');
Res=Local_Process_uint16_mymod(I,40,40)
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