function out = yuvjpeg(file,p)
%file must be square
%Some parts of code obtained from
%http://math.gmu.edu/~tsauer/class/447/proj/chap11.pdf

Q = p*[16 11 10 16 24 40 51 61
     12 12 14 19 26 58 60 55
     14 13 16 24 40 57 69 56
     14 17 22 29 51 87 80 62
     18 22 37 56 68 109 103 77
     24 35 55 64 81 104 113 92
     49 64 78 87 103 121 120 101
     72 92 95 98 112 100 103 99]

Q2 = p*[17 18 24 47 99 99 99 99  %YUV uses a second Quantization matrix
    18 21 26 66 99 99 99 99      %For the U and V values
    24 26 56 99 99 99 99 99
    47 66 99 99 99 99 99 99
    99 99 99 99 99 99 99 99
    99 99 99 99 99 99 99 99
    99 99 99 99 99 99 99 99
    99 99 99 99 99 99 99 99]


X = imread(file);

X = double(X);
r = X(:,:,1);
g = X(:,:,2);
b = X(:,:,3);

%YUV values converted from RGB
Y = 0.299*r + 0.587*g + 0.114*b;
U = b - Y;
V = r - Y;

[m,n] = size(r);

for i = 1:8:m
    for j = 1:8:n

        block = Y(i:i+7,j:j+7);
        comp = imagecomp(block,Q);
        Y(i:i+7,j:j+7) = comp;

    end
end


for i = 1:8:m
    for j = 1:8:n

        block = U(i:i+7,j:j+7);
        comp = imagecomp(block,Q2);
        U(i:i+7,j:j+7) = comp;

    end
end

for i = 1:8:m
    for j = 1:8:n

        block = V(i:i+7,j:j+7);
        comp = imagecomp(block,Q2);
        V(i:i+7,j:j+7) = comp;

    end
end

%re-assign RGB values and re-enter into matrix
r = V + Y;
b = U + Y;
g = (Y - 0.299*r - 0.114*b)/(0.587);
X(:,:,1) = r;
X(:,:,2) = g;
X(:,:,3) = b;

imagesc(uint8(X));

title(['P = ', num2str(p)])

out = X;

Not enough input arguments.

Error in yuvjpeg (line 6)
Q = p*[16 11 10 16 24 40 51 61

Published with MATLAB® R2018a