How to get the hue/saturation of a colourful images?

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ahmad Al sarairah 2019-12-29

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编辑： Guillaume 2020-1-8

I have a set of color images and I want to get the values of hue and saturation and brightness using matlab , But I want to get the values quickly for all the images because the number of images is too large.

thanks to all.

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回答（2 个）

KALYAN ACHARJYA 2019-12-29

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rgb2hsv and get the data

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ahmad Al sarairah 2019-12-29

how do i save data in cell array?

KALYAN ACHARJYA 2019-12-29

编辑：KALYAN ACHARJYA 2019-12-29

在 MATLAB Online 中打开

for i=1:...
variable_name{i}=data_to_be_save
end 

See here

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Image Analyst 2019-12-29

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https://ww2.mathworks.cn/matlabcentral/answers/498355-how-to-get-the-hue-saturation-of-a-colourful-images#answer_408078

在 MATLAB Online 中打开

See the FAQ: https://matlab.fandom.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F

Then inside the loop over k, call rgb2hsv(). If you want the means, do

hsvImage = rgb2hsv(rgbImage);
hmean(k) = mean2(hsvImage(:, :, 1))
smean(k) = mean2(hsvImage(:, :, 2))
vmean(k) = mean2(hsvImage(:, :, 3))

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Image Analyst 2020-1-7

mean2() is a function in the Image Processing Toolbox that takes the mean of a 2-D array. It's basically the same as mean(array(:)).

Guillaume 2020-1-8

编辑：Guillaume 2020-1-8

在 MATLAB Online 中打开

Or since R2018b, you can also use mean(array, 'all'). There's not much need for mean2 anymore. You could also calculte the mean of all 3 channels at once as a 1x3 vector with:

hsvmean = squeeze(mean(hsvImage, [1, 2])); %requires R2018b or later

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