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
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Guillaume
2018-1-2
You use some odd terms in your question which makes it difficult to understand. What do you mean by project? What is pixel number? And what do you mean by vice versa?
It sounds like you simply want to display your image which you'd do with
imshow(yourimagearray)
If you wanted to see the axis, you'd do
axis on
afterward. But I've no idea if that's what you're asking.
回答(2 个)
Walter Roberson
2018-1-2
YourImage = imread('shadow_remove.
jpg') ;
GreyImage = rgb2gray(YourImage) ; %jpeg are rarely rarely greyscale files even if they look to be
plot(GreyImage(:))
2 个评论
Walter Roberson
2018-1-3
The horizontal and vertical projection are max(GreyImage,[],1) and max(GreyImage,[],2) which you could then plot() or bar() to display.
Guillaume
2018-1-3
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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