MATLAB: Can we change the intensity value of the histogram?

histogram

suppose we ha histogram. on a particular x value i want to change the y value . can it be possible ? if yes then tell me ..

Best Answer

Yes. To change the counts array, just change it. For example to change the number of counts in bin #101 (which holds counts for gray level 100), and to get rid of big spikes at the ends, do this:

[pixelCounts, grayLevels] = imhist(grayImage);
pixelCounts(101) = 1234; % Change count to 1234.
% Suppress big spikes at 0 and 255:
pixelCounts(1) = 0;
pixelCounts(256) = 0;

Related Solutions

MATLAB: Image processing

Histogram is a statistic of the image that gives information about the number of pixels of a particular intensity. It is irreversible, in the sense that with a histogram, you cannot recreate the image, and hence cannot predict the pixel value at a particular point. Having said this, it is possible to calculate the percentage of a particular gray level. This is equivalent to just normalizing the histogram on a unit scale. For example,

I = imread('rice.png');

hist = imhist(I);

%percentage of pixels that have the value 105, is

hist(105)/sum(hist) %This is the fraction.

and as a check, sum(hist) should always be equal to the number of pixels in the image.

Hope this helps!

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

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

Best Answer

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MATLAB: Image processing

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

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