how to create vision contrast test system in MATLAB?

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OJ27
OJ27 on 23 Mar 2018
Edited: OJ27 on 23 Mar 2018
Anyone have any idea how I can create this chart? I am using cosine functions with different frequencies and plotting them over a 2D grid. However, I do not know how to get the exact same contrast as the original chart
x = linspace(- .5 * pi, .5* pi, rows);
y = linspace(1, 100, rows);
[xx,~] = meshgrid(x, y);
z = L(i) .* (C(i) .* cos(2 .* pi .* freq .* xx) + 1);
where L is the luminance and C the contrast. If you know a better way, It'd be great to learn it.

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