How to express the grey-scale image as a twodimensional matrix whose size is M1 x M2.?
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Express the grey-scale image watermark as a two dimensional matrix whose size is M1 x M2.
Img = {Img( k,j), 0 ≤ k ≤ M1, 0 ≤ j ≤ M2}
Convert the two-dimensional image matrix Img into a one-dimensional vector W of length M1 x M2.
W = {W(i) = Img (k,j) ,i = k x M2 + j, 0 ≤ k ≤M1, 0≤ j ≤M2}
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