How to change the size of a image, which is saved as a .mat file?

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Gulfam Saju
Gulfam Saju 2022-3-16
评论： Walter Roberson 2022-3-18
load e15802s13_P50176.7.h5.mat;
I have this image. I want to change the size/dimension of the image from this mat file. How can I do that?
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Walter Roberson
Walter Roberson 2022-3-18
Your input has:
  • input dimension #1 has size 20
  • input dimension #2 has size 640
  • input dimension #3 has size 20
  • input dimension #4 has size 640
You want 256 x 256 x 8 output.
Which of the input dimensions should correspond to your output dimension #1, size 256?
Which of the input dimensions should correspond to your output dimension #2, size 256?
Which of the input dimensions should correspond to your output dimension #3, size 8?
What should happen to the 4th input dimension? For example are you wanting to take mean() over a dimension? max() over a dimension ("Maximum Projection" is a real thing and sometimes very useful) ?

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回答（1 个）

DGM
DGM 2022-3-16
Since a .mat file can contain any number of things, I'm going to have to assume that:
  • you know what's in the file and how to open it
  • the content is something which can be handled with existing image processing tools
  • you know how you want to save the file and how to save it
... in which case the answer is incredibly generic:
Open the file, resize the image(s) with imresize(), and then save the result in whatever way you intend.
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Walter Roberson
Walter Roberson 2022-3-16
If the .mat file contains a figure that has an image displayed inside it, then you can use imhandles() https://www.mathworks.com/help/images/ref/imhandles.html on the figure to get the handles of the image() objects. Then you can access the CData property to get the data.
(You might also need to cmap = colormap(ancestor(ImageHandle, 'axes')) in order to get the color map. And in some cases you might need to caxis(ancestor(ImageHandle, 'axes')) in order fetch the color mapping properties.)

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