File:40 by 40 thumbnail of 'Green Sea Shell' fourier interpolated.png
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40_by_40_thumbnail_of_'Green_Sea_Shell'_fourier_interpolated.png (160 × 160 pixels, file size: 37 KB, MIME type: image/png)
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Summary
| Description |
English: This is an example image with a fourier domain scaling algorithm applied (x4). The thumbnail before scaling up was a 40 by 40 scaled-down version of the Wikipedia Commons photograph 'Green sea shell (11985932994).jpg' by James Petts
%MATLAB code, after opening File:40 by 40 thumbnail of 'Green Sea Shell'.png: i=1; shell_i(:,:,i)=(interpft(interpft(shell(:,:,i),size(shell,2)*2,2),size(shell,1)*2,1)); %fourier interpolation 2D / padding with 0 freq components i=2; shell_i(:,:,i)=(interpft(interpft(shell(:,:,i),size(shell,2)*4,2),size(shell,1)*4,1)); i=3; shell_i(:,:,i)=(interpft(interpft(shell(:,:,i),size(shell,2)*4,2),size(shell,1)*4,1)); shell_i=[]; shell_i=shell_i-min(shell_i(:)); shell_i=shell_i./max(shell_i(:)); export_fig '40 by 40 thumbnail of 'Green Sea Shell' fourier interpolated.png' '-png' '-native' '-a1' |
| Date | |
| Source |
This file was derived from: Green sea shell (11985932994).jpg |
| Author | James Petts from London; shaddim |
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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 17:41, 29 March 2016 | | 160 × 160 (37 KB) | Shaddim | User created page with UploadWizard |
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