在没有rgb2gray的情况下在MATLAB中将彩色图像转换为灰度 [英] Convert a color image to grayscale in MATLAB without rgb2gray

问题描述

我想将我的彩色图像转换为灰度，并避免使用 rgb2gray 命令。

I want convert my color image to grayscale and avoid to use rgb2gray command.

推荐答案

那么：

I_grey = mean(I_colour, 3);

您可能需要将其投射到 uint8 然后才能查看它：

It's possible you then might need to cast it to a uint8 before you can view it:

I_grey = uint8(mean(I_colour, 3));

或者如果你想要真正准确，你应该找到加权平均值。有关加权选项，请参阅此问题的答案：确定RGB颜色亮度的公式

Or if you want to be really accurate you should actually be finding a weighted average. See the answer to this question for weighting options: Formula to determine brightness of RGB color

这是一个例子：

W = permute([0.3086, 0.6094, 0.0820], [3,1,2]);
I_grey = uint8(sum(bsxfun(@times, double(I_colour), W),3));

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