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Image from matrix with specific x y scaling

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Pratik Samant
Pratik Samant on 22 May 2017
Answered: Will Nitsch on 25 May 2017
I have a 38x2252 matrix representing an image. I also have an asymmetrix x and y value distribution between the pixels in this image. I.e. the vector of x locations is [1:38]*200 (in nanometers) and the vector of y locations is [1:2252]*4.5 (in nanometers).
When displaying this image, is it possible to scale the view such that the pixel locations are plotted to scale as compared to their corresponding x y coordinates? Also, is it then possible to take this image and convert it to gray scale while maintaining this aspect ratio? Current if I convert to grayscale the image becomes severely compressed because MATLAB scales both axes the same way.
So far I have tried
dy = 4.5e-9;
dx=200e-9;
imshow(I(:,1:2252,10)','XData',[dx dx*38],'YData',[dy dy*2252]);
But the displayed image is 'too big to fit on screen' This doesn't make sense to be because it's only a 38x2252 image and so shouldn't have any issues on a desktop screen like mine.
Thanks,

Answers (1)

Will Nitsch
Will Nitsch on 25 May 2017
Have you tried adjusting the 'DataAspectRatio' property of the axes in which the image is displayed?
hFig = figure; hAx = gca; imshow(yourData); hAx.DataAspectRatio = [38*200, 2252*4.5, 1];
Not sure if that's what you are trying to do but perhaps knowledge of that property is useful information for you.

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