Computer Vision Foundations · 免费预览

下采样与上采样

下采样采用预滤波加抽取，对于2的幂次通过级联实现；上采样采用零填充扩展加插值滤波器。

1. Downsampling is two operators in a trench coat

Downsampling is two operators in a trench coat

Expansion, the transpose

Interpolation filters fill the gaps

The two directions are not opposites

Which composition correctly defines downsampling an image by a factor of two, and why is the order of the operators not interchangeable?

The signal $[a, b]$ is expanded by $k = 2$ . Which statement about the result and its spectrum is correct?

The two-sample signal $[a, b]$ is expanded by a factor of $k = 2$ using zero-stuffing. Write the value at index 1 of the expanded signal.

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