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downsampling

 
 
chibitul
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      07-26-2003
how does a camera with 1280x960 capcure images at lower resolution, say
1024x768? is there a mathematical downsampling algorithm, or simply
"skips" some pixels?
 
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JPS@no.komm
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      07-27-2003
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<(E-Mail Removed)>,
chibitul <(E-Mail Removed)> wrote:

>how does a camera with 1280x960 capcure images at lower resolution, say
>1024x768? is there a mathematical downsampling algorithm, or simply
>"skips" some pixels?


I can't say that no camera does it, but skipping pixels would be a
disaster, especially if the full resolution isn't a multiple of the
output, as in your example; that would distort the placement of pixels
in the scene, such that you'd have tiles of the original scene, with
missing grid-lines, and the left-over tiles stretched to cover the
missing space. Even if it was every other pixel, the placement of
pixels wouldn't be distorted, but the image would be too sharp and have
artifacts, because the anti-aliasing filter that prevents moire will be
basically over-ridden.
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