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Upsampling is the process of increasing the sampling rate of a signal. For instance, upsampling raster images such as photographs means increasing the resolution of the image.

In signal processing, downsampling (or "subsampling") is the process of reducing the sampling rate of a signal. This is usually done to reduce the data rate or the size of the data.

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Q: What is up sampling and down sampling?
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Related questions

What is sampling up?

Sampling up an image is the same with enlarging it. You can use up sampling to fit an image to a larger surface.


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You are correct; convenience sampling is not random sampling.


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What is the difference between quota sampling and cluster sampling


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