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Image matrix dimensions flipped compared to original image

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Punnag Chatterjee
Punnag Chatterjee 2020-12-4
评论： Bjorn Gustavsson 2020-12-4
img1 = rgb2gray(imread('Image1.png'));
size(img1)
ans =
384 512
When I apply this command to load the image the matrix 384x512. However, the original png image has 512x384 pixels. What am I missing here that the image matrix in MATLAB looked flipped. I was expecting MATLAB to create a 512x384 matrix.

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Ameer Hamza
Ameer Hamza 2020-12-4
编辑：Ameer Hamza 2020-12-4
Commonly image resolution is expressed as width x height. However, in MATLAB the size() returns "number of rows (height)" x "number of columns (width)". However, it should not look flipped due to this. imshow() should show the same image as shown outside MATLAB.
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Punnag Chatterjee
Punnag Chatterjee 2020-12-4
Yes, when I use imshow it does show the image correctly, the problem occurs when I am indexing the individual matrix elements for some image operations.
Bjorn Gustavsson
Bjorn Gustavsson 2020-12-4
Then you'll have to "learn to accept" the matlab-indexing-notation/convention:
I_xy = Img(row_idx_y,col_idx_x);

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