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I'm new to Matlab and am trying to do a bit of image processing. I have two color images that I convert to grayscale. My goal is to be able to put the histograms for both grayscale images on the same figure so I can compare them. My code looks like this:
a=imread('image1.jpg')
agray=rgb2gray(a)
b=imread('image2.jpg')
bgray=rgb2gray(b)
figure,imhist(agray)
figure,imhist(bgray)
The code works fine for looking at the two histograms independently, but I can find how to combine them into one figure for comparison. Please help!!
239
The imhist function creates a histogram plot by defining n equally spaced bins, each representing a range of data values, and then calculating the number of pixels within each range. You can use the information in a histogram to choose an appropriate enhancement operation.
I = imread('pout. tif'); Display a histogram of the image. Since I is grayscale, by default the histogram will have 256 bins.
Description. histogram2( X,Y ) creates a bivariate histogram plot of X and Y . The histogram2 function uses an automatic binning algorithm that returns bins with a uniform area, chosen to cover the range of elements in X and Y and reveal the underlying shape of the distribution.
If you want both on the same axes and you don't mind loosing the lower bar, try this (I don't have the Image Toolbox right now, so I haven't tested it):
a=imread('image1.jpg')
agray=rgb2gray(a)
b=imread('image2.jpg')
bgray=rgb2gray(b)
[counts,x] = imhist(agray)
stem(counts,x,'b')
hold on
[counts,x] = imhist(bgray)
stem(counts,x,'r')
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