how to project image into (x,y) coordinates graph

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I have an image and wish to project the pixel details into graphical form in which x,y coordinates are pixel position and pixel number and vice versa. Can anyone help me
  3 Comments
SHOBA MOHAN
SHOBA MOHAN on 3 Jan 2018
Kindly apologize for typo errors. I wish to plot x_width and y_height of image. In x_width plot, x and y axis are pixel position and pixel number whereas in y_height plot, the x and y axis are vice versa. Suggest me to do this

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Answers (2)

Walter Roberson
Walter Roberson on 2 Jan 2018
YourImage = imread('shadow_remove.
jpg') ;
GreyImage = rgb2gray(YourImage) ; %jpeg are rarely rarely greyscale files even if they look to be
plot(GreyImage(:))
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Walter Roberson
Walter Roberson on 3 Jan 2018
The horizontal and vertical projection are max(GreyImage,[],1) and max(GreyImage,[],2) which you could then plot() or bar() to display.

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Guillaume
Guillaume on 3 Jan 2018
If I understood correctly you have a binary image and you want the pixel count (which you call the pixel number) along each column and along each row:
%binaryimage: a binary image
xwidth = 1:size(binaryimage, 2);
xcount = sum(binaryimage, 1);
yheight = 1:size(binaryimage, 1);
ycount = sum(binaryimage, 2);
You can plot that any number of ways, e.g.:
figure;
subplot(1, 2, 1);
bar(xwidth, xcount);
xlabel('pixel position along x');
ylabel('pixel count');
title('horizontal histogram');
subplot(1, 2, 2);
barh(yheight, ycount);
xlabel('pixel count');
ylabel('pixel position along y');
title('vertical histogram');

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