resampling

resampling - Resampling Image Scaling This image is too big...

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Unformatted text preview: Resampling Image Scaling This image is too big to fit on the screen. How can we reduce it? How to generate a half- sized version? Image sub-sampling Throw away every other row and column to create a 1/2 size image 1/4 1/8 Why does this look so crufty? Called nearest-neighbor sampling Even worse for synthetic images Sampling and the Nyquist rate Aliasing can arise when you sample a continuous signal or image Demo applet http://www.cs.brown.edu/exploratories/freeSoftware/repository/edu/brown/cs/exploratories/applet occurs when your sampling rate is not high enough to capture the amount of detail in your image formally, the image contains structure at different scales called frequencies in the Fourier domain the sampling rate must be high enough to capture the highest frequency in the image To avoid aliasing: sampling rate > 2 * max frequency in the image i.e., need more than two samples per period This minimum sampling rate is called the Nyquist rate Subsampling with Gaussian pre-filtering...
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resampling - Resampling Image Scaling This image is too big...

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