Need help-Image Smoothing problem ?

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Annika 2014-8-4

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https://ww2.mathworks.cn/matlabcentral/answers/146241-need-help-image-smoothing-problem

评论： Annika 2014-8-5

Hello,

I am working on a project, where I have to plot some COMSOL images. I choose to get data from COMSOL and plot it through MATLAB, as i have many images. Its a 2D plot.

I am attaching both the images. Problem is I get a very smooth image from COMSOL but when plotting it through MATLAB give me not so good image.

I tried using some noise filter , but could not get a good reslt.

Can some one suggest me, how can i smoothen the image?

First image is COMSOL generated and second is MATLAB plotted.

Thanks Anushka

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Answer 1

Image Analyst 2014-8-4

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在 MATLAB Online 中打开

You are just using a colorbar with not many colors (64) so it looks posterized. Use a colormap with higher precision/more colors

colormap(jet(256));

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Annika 2014-8-4

Thank you so much.

Annika 2014-8-5

在 MATLAB Online 中打开

May I also know how did you keep this number 256? What is the range of numbers that can be used? Cause when i inter-change the axis 'Y' to 'Z' and 'Z' to 'Y', i again view posterized image. I already tried using 128 and 64 instead of 256 but it still looks not ok. Below is the code i used and also attaching image,

if true
  for i=3:length(datamat)
sig{i}=XY2Mat(datamat{1},datamat{2},datamat{i},200,250);
figure(i);
  imagesc(sig{i});
  caxis([-max(abs(datamat{i})) max(abs(datamat{i}))])
  colormap(jet(512));
  colorbar
  xlabel('Y')
  ylabel('Z')
  hold on;  
end 
end