Computer Vision Foundations · 免费预览
色彩与空间锐度
人眼对亮度分辨精细，但对色度分辨较差，因此颜色可以用比空间细节更低的分辨率存储，而不会造成任何可见损失。
1. Not all channels resolve equally
Not all channels resolve equally
2. The Lab decomposition
The Lab decomposition
3. The blur experiment
The blur experiment
4. Chroma subsampling in compression
Chroma subsampling in compression
5. Which blur is invisible
An image is split into Lab channels and one channel is blurred while the others stay sharp. Which choice changes the image least visibly?
6. Why compression subsamples chroma
A video encoder stores luma at full resolution but chroma at half resolution in each dimension. Why does the decoded video look sharp?
7. The chroma budget
Chroma is stored at half resolution in each spatial direction relative to luma. Write the fraction of luma samples that one chroma channel needs.