Help with Pixel intensity histogram and export

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Chris
Chris 2014-6-5
回答： Image Analyst 2014-6-5
Hi everyone,
So I have a gray image, and I have created a matrix of the pixel intensity values. I then plotted these on a histogram to see the frequency of certain pixel intensities. Right now, I'm having trouble with two things:
  • How do I export this data, getting the "bin" sizes from the x axis and the frequency on the y axis?
  • How can I fit the behavior of the "tops" of the histogram via a non-normal distribution (the shape I have is like 3 mountains).
Here is my code:
clc grid on; imagename = 'blah.jpg'; I=imread(imagename); K=rgb2gray(I); imshow(K); [x,y]=size(K); X=1:x; Y=1:y; [xx,yy]=meshgrid(Y,X); i=im2double(K)
figure;mesh(xx,yy,i);colorbar; figure;h=pcolor(i);set(h,'Edgecolor','none'); figure;imhist(i,256); %256 since the range of gray pixel is 0 to 255 [hh,xxx]=hist(i,256);
Thanks!

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回答（1 个）

Image Analyst
Image Analyst 2014-6-5
You can use
[pixelCounts, grayLevels] = imhist(grayImage, 256);
bar(grayLevels, pixelCounts);
Not sure exactly what you mean by export but you can try fprintf(), save(), xlswrite(), writetable(), csvwrite(), dlmwrite(), etc.
Not sure how you want to fit 3 mountains. Maybe 3 Gaussians, maybe a 6th order polynomial (if the peaks are spaced evenly).

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