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How to convert RGB image to grayscale image

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aarti sawant
aarti sawant 2014-2-2
评论： DGM 2021-11-30
Please help me to convert RGB image to grayscale without using rgb2gray().

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Image Analyst
Image Analyst 2014-2-2
Sounds like homework. You can get the color channels:
% Extract the individual red, green, and blue color channels.
redChannel = rgbImage(:, :, 1);
greenChannel = rgbImage(:, :, 2);
blueChannel = rgbImage(:, :, 3);
and then do a weighted average of them.
grayImage = a1 * redChannel + a2 * greenChannel + a3 * blueChannel;
Look up standard weights, or pick your own.
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DGM
DGM 2021-11-30
What's wrong with just giving the luma constants?
[0.299 0.587 0.114] for Rec 601 (what rgb2gray() uses)
or
[0.2126 0.7152 0.0722] for Rec 709

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