Computer Vision Foundations · free preview

Color and Spatial Sharpness

The eye resolves luminance finely but chrominance poorly, so color can be stored at a fraction of the spatial detail without any visible loss.

1. Not all channels resolve equally

Not all channels resolve equally

The Lab decomposition

The blur experiment

Chroma subsampling in compression

An image is split into Lab channels and one channel is blurred while the others stay sharp. Which choice changes the image least visibly?

A video encoder stores luma at full resolution but chroma at half resolution in each dimension. Why does the decoded video look sharp?

Chroma is stored at half resolution in each spatial direction relative to luma. Write the fraction of luma samples that one chroma channel needs.

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