how to normalized a hsv histogram?

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R 2013-7-10

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https://ww2.mathworks.cn/matlabcentral/answers/81648-how-to-normalized-a-hsv-histogram

i want to normalize hsv histogram. i have three different of each h,s,and v. i want to normalize them so that i can compare it with h,s and v plot. for this firstly i have to normalize the histogram i tried in following way but it did not work..

rgb = imread('wheatimage.jpg');hsv = rgb2hsv(rgb);

h = hsv(:, :, 1);

v = hsv(:, :, 3);

numberOfBins = 50;

s = hsv(:, :, 2); % or whatever.

[countsH valuesH] = hist(h, numberOfBins);

figure; subplot(2, 2, 1);

bar(valuesH, countsH, 'BarWidth', 1);

title('Histogram of the H Channel', 'FontSize', 15);

[countsS, valuesS] = hist(s, numberOfBins);

subplot(2, 2, 2);

bar(valuesS, countsS, 'BarWidth', 1);

title('Histogram of the S Channel', 'FontSize', 15);

[countsV, valuesV] = hist(v, numberOfBins);

bar(valuesV, countsV, 'BarWidth', 1);

title('Histogram of the V Channel', 'FontSize', 15);%# create histogram from a normal distribution.

g=1/sqrt(2*pi)*exp(-0.5*valuesH.^2);%# pdf of the normal distribution

% DIVIDE BY AREA figure(1)

bar(valuesH,countsH/trapz(valuesH,countsH));hold on

plot(valuesH,g,'r');hold off

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R 2013-7-11

is their any other way to normalize hsv histogram other than this.

Jan 2013-7-11

What exactly should be "normal" after the normalization? All we see is the code, which does not do what you want. But this does not allow to identify, what you want.

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回答（1 个）

Jan 2013-7-11

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/81648-how-to-normalized-a-hsv-histogram#answer_91475

What exactly should be normalized? The area under each curve or all 3 curves?

Perhaps this helps: FEX: NormalizedHistogram

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R 2013-7-11

i want to compare to image on the base of hsv and compare their histogram on bases of chi-square dist method. so for that i want to normalize my hsv histograms..

R 2013-7-11