MATLAB: How does the imhist function work for RGB image

digital image processingimage analysisimage processingImage Processing ToolboxMATLAB

Hello everyone.

I looked up the use of imhist function. It plots the histogram for a grayscale image. But if the input is an RGB image, it still produces a histogram? Is it converting the RGB to grayscale and then showing the histogram?

And would it be technically correct to show the histogram for a RGB image this way? Thanks in advance!

Best Answer

Did you try to look at the source code

>> edit imhist.m

Also, see attached demo. You might like it.

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MATLAB: How the Peak value of the image histogram can be obtaind

[pixelCounts, grayLevels] = imhist(grayImage);
[maxCount, indexOfMax] = max(pixelCounts);
grayLevelAtMax = grayLevels(indexOfMax);

MATLAB: Intepretation of image histogram

Your image values range from 0 to 1. Perhaps you used im2double to scale a floating point image to the range that most MATLAB functions that operate on floating point images like. The bar chart represents the frequency of occurrence of that intensity value. So you have a lot of dark pixels and not as many bright ones.

Best Answer

Related Solutions

MATLAB: How the Peak value of the image histogram can be obtaind

MATLAB: Intepretation of image histogram

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