how to solve the following error in the code?

clc;
close all;
% clear all;

inImg = imread('C:\Users\Poonam\Desktop\MATLAB\R2008a\bin\matlabimage\lotus.jpg');
figure;imshow(inImg);title('Input Image');

s_inImg = size(inImg);
outImg = zeros(s_inImg);
ycbcrOutImg = zeros(s_inImg);

%DCT Parameters
blkSize = 8;

ycbcrInImg = rgb2ycbcr(inImg);
y_inImg = ycbcrInImg(:,:,1);
cb_inImg = ycbcrInImg(:,:,2);
cr_inImg = ycbcrInImg(:,:,3);

I_max = max(max(y_inImg));

%Block-wise Splitting
y_blocks = Mat_dec(y_inImg, blkSize);

s = size(y_blocks);
dctBlks = zeros(s);

for i = 1 : s(3)
    for j = 1 : s(4)
        localBlk = y_blocks(:,:,i,j);
        localdctBlk = dct2(localBlk);

          localdctBlk = localdctBlk ./ 8;

          orig_dc = localdctBlk(1,1);

          %Adjustment of Local Background Illumination
          x = localdctBlk(1,1) / double(I_max);
          mapped_dc = x * (2 - x) * double(I_max);

          %Preservation of Local Contrast
          k = mapped_dc / orig_dc;

          localdctBlk(1,1) = k * localdctBlk(1,1);

          dctBlks(:,:,i,j) = localdctBlk;
      end
  end

dctImg = merge_blocks(dctBlks);

dctImg = dctImg .* 8;

*y_outImg = blkproc(dctImg, [8 8], 'idct2(x)');

ycbcrOutImg(:,:,1) = y_outImg;
ycbcrOutImg(:,:,2) = cb_inImg;
ycbcrOutImg(:,:,3) = cr_inImg;
*  
ycbcrOutImg = uint8(ycbcrOutImg);

rgbOutImg = ycbcr2rgb(ycbcrOutImg);

figure;imshow(rgbOutImg);title('DC Adjustment');

• *??? Subscripted assignment dimension mismatch.

Error in ==> colordct at 57 ycbcrOutImg(:,:,1) = y_outImg;* *

[dpb]

What does

size ycbcrOutImg
size y_outImg

reveal?

[Poonam]

y_outImg-<112x168 double>, 2D

ycbcrOutImg-<113x170x3 double> 3D

[dpb]

So, there's your problem...the two aren't commensurate in size. Now that you see that one is a row longer and two columns wider than the other, do whatever it is that you needs must to correct it. Throw away a row and two columns or pad the smaller or whatever your application should do...