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Creating a plot of intensity of pixels across an image using MATLAB?

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Niranjan
Niranjan 2011-1-21
评论： Walter Roberson 2020-11-14
Hi am a newbie to MATLAB. Can anyone suggest me a code to plot a graph for number of pixels in each column of an image? any serious help would be appreciated.Thanks in advance.I need a code to get the density of black pixels in every column of an image.

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Walter Roberson
Walter Roberson 2011-1-21
It is not clear to me what kind of output you want, but
bar(mean(~im))
should calculate the average density of black (== 0) down the columns and draw a bar chart of the result.

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Doug Hull
Doug Hull 2011-1-21
Since you want the density of black pixels in an image, I am assuming you have an image that is:
  • Intensity based (not RGB, or indexed)
  • You want only pure black pixels (value 0 for black, 255 for white)
(edit your question if these assumptions are wrong)
im = round(rand(5))*255
subplot(2,1,1)
image(im);
colormap(gray)
isBlack = (im == 0);
numBlack = sum(isBlack);
numPix = size(isBlack,1);
denBlack = numBlack/numPix;
subplot(2,1,2)
plot(denBlack)

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