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Thank you for replay  Duvvuri B K Kamesh Duvvuri...

Ck1 = mat2cell(Ik1, repmat(1,[1 size(Ik1,1)/1]),repmat(2,[1 size(Ik1,2)/2]));

Use this code Line to divide an Image into 1by2 blocks. IK1-> is your 512 by 512 image.

Thank You

you can use reshape command then you get 1 X 262144 and the do further process on it.

Also you can use for color image

I=mat2cell(rgbImage, blockVectorR, blockVectorC, numberOfColorBands);

you can also use 'reshape' fuction to get two colum wide matrix. Each row can be treated as such a 1 by 2 block.

If you want to keep the original orientation of the pixels you need to work in three steps:

Now, each row in 'sliced_img' is one of your blocks in size 1x2x3 so it's 2 pixels with RGB values.