在matlab中排序颜色 [英] sorting colors in matlab

问题描述

我在260000 * 3维数组中有不同的RGB值。我要按升序或降序排列这些颜色（不重要是哪一个），以使相似的颜色更接近。什么是最有效的方法来做到这一点？

I have different RGB values in a 260000 * 3 dimension array. I wan to sort these colors in ascending or descending order (it does not matter which) so that similar colors are closer. What's the most efficient way to do this?

推荐答案

示例：

首先， ：

Example:

First we start with the regular Jet colormap:

%# sample image mapped to Jet colormap
I = repmat(1:100, 100, 1);
C = jet(100);

figure
subplot(211), imagesc(I), colormap(C)
subplot(212), rgbplot(C)

首先，我们洗牌的颜色。然后，我们尝试恢复原始的颜色分组（我们通过在 HSV 颜色空间中排序根据色调和值）：

First we shuffle the colors. Then we try to recover the original grouping of colors (we do this by sorting in the HSV colorspace according to the hue and value):

%# shuffle colors
C = C(randperm(100), :);

%# rearrage according to HSV colorspace
C = rgb2hsv(C);
C = sortrows(C, [-1 -3 2]);  %# sort first by Hue, then by value
C = hsv2rgb(C);

figure
subplot(211), imagesc(I), colormap(C)
subplot(212), rgbplot(C)

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