MATLAB: How i can get color histogram of H channel of HSV image

h channel

how i can get H channel color histogram of HSV image

Best Answer

Use histogram() or histcounts() . Or accumarray()

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MATLAB: Histogram plotting where the x-axis is in multiples of 0.1

You have two options:

1. You can use the histogram command. When calling histogram you can specify your bins:

binwidth = 0.1;
histogram(X,-0.5:binwidth :0.5)

2. The histogram command will create bars that are touching one another, which doesn't quite match your image. If you want bars that do not touch one another, you will have to bin and plot your data in two steps using histcounts and bar.

binwidth = 0.1;
[N,edges] = histcounts(X,-0.5:binwidth :0.5);
ctrs = (edges(1:end-1)+edges(2:end))/2;
barwidth = 0.5;
bar(ctrs,N,barwidth);

MATLAB: How to obtain the brightness value of the image taken by any camera

What is your definition of brightness? Do you want to convert to grayscale, CIELAB color space and take the L channel, or HSV color space and take the V channel?

brightness = rgb2gray(rgbImage);
hsvImage = rgb2hsv(rgbImage);
brightness = hsvImage(:, 3);
labImage = rgb2lab(rgbImage);
brightness = labImage(:, 1);

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Related Solutions

MATLAB: Histogram plotting where the x-axis is in multiples of 0.1

MATLAB: How to obtain the brightness value of the image taken by any camera

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