Change resize algorithm in figure window

Hi,

Does anyone know which resize algorithm matlab is using to represent my data in a limited number of pixels? Is it some flavour of imresize?

Secondly, I would like to change which algorithm is used, any info on that?

(Specifically, I am using imagesc to create a plot, and I am not happy with how the data is represented. But my question is probably not specific to imagesc).

Answer 1

[Jan]

If you mean, how image() resizes the data to match the pixels of the display, see: https://www.mathworks.com/matlabcentral/answers/454161-interpolation-method-of-image

[Andreas Westlund]

Thanks, but that seems to be another question regarding the same thing, but no answer :)

[Jan]

The answer of this other question shows, that a nearest neighbor method is applied.

If you want to change it, replace imagesc() by a function, which resizes the image using imresize() using the available pixels in the figure.

[Andreas Westlund]

But how do I get this done dynamically, i.e. when zooming in the figure?

[Jan]

You can insert this in the SizeChangedFcn of the figure. Put the original image data in the UserData of the image object. Then apply the reizing whenever the size is changed. This can cause troubles due to the delay. See https://www.mathworks.com/matlabcentral/answers/400382-delay-when-resizing-a-figure-in-r2016b