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Any image processing expert?

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Pradeep Gowda
Pradeep Gowda 2015-5-10
关闭： MATLAB Answer Bot 2021-8-20
when we extract the YIQ colors from RGB picture why do we do this
sNtsc = rgb2ntsc(sBmp);
picY = sNtsc(:,:,1)*256-128; % Y luminance component
picI = sNtsc(:,:,2)*256-128; % I chrominance component
picQ = sNtsc(:,:,3)*256-128; % Q chrominance component
each component of YIQ is being multiplied by 256 and subtracted by 128? why is that?

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Image Analyst
Image Analyst 2015-5-10
sNTSC will be in the range 0-1. sNTSC is already a YIQ image. Evidently the author wanted to scale the intensities to -128 to +127. I don't know why.
I wouldn't even bother using that color space. Why are you using that in preference to color spaces like HSV and LAB?

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