How to get the histogram features of an RGB image? and can use it as color extraction? i want to find the mean, variance ,skewness, energy ,kurtosis, and entropy .. please help

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jerome liwanag 2019-2-26

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https://ww2.mathworks.cn/matlabcentral/answers/447115-how-to-get-the-histogram-features-of-an-rgb-image-and-can-use-it-as-color-extraction-i-want-to-fin

回答： Image Analyst 2019-2-28

I have this project that need to extact the color features . I already know how to get the average RGB but i want to add more feautes .

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Niti K 2019-2-26

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you can either convert rgb image to grayscale using rgb2gray or plot histograms for individual channel using indexing.

for example red channel for an RGB image can be accessed by I(:,:,1) where I is the rgb image.

For colour extraction you could first convert the image from RGB to HSV, HSI (though that has wrapping/branch-cut issues in the hue) or Lab space. Those image formats might give more meaningful colour histograms. Also have a look at the file exchange contributions that does this task well:

Color and hue histograms, color histograms and color-clouds, color image histogram

jerome liwanag 2019-2-28