Computer Vision Foundations · 免费预览
拉普拉斯金字塔
从父层减去上采样后的层，可将每个尺度带分解为各自的图像，即拉普拉斯金字塔——一种过完备的可逆表示，可从微小残差出发向下重建。
1. What each level has that its child lacks
What each level has that its child lacks
2. Upsampling, with a factor of two
Upsampling, with a factor of two
3. Building it back, downward
Building it back, downward
4. Overcomplete, and usefully so
Overcomplete, and usefully so
5. The subtraction's meaning
The Laplacian level l_k = g_k minus F_k g_{k+1} is called band-pass. What does it contain?
6. Why the factor of two
In F_k = 2 B_k U_k, why does the factor of two appear?
7. The residual count
How many low-pass residual images does a complete Laplacian pyramid keep at its tip? Write the number.