Computer Vision Foundations · 免费预览
混合与方向可控金字塔
在高斯金字塔掩模下按拉普拉斯带混合，可通过随层级加宽过渡来消除接缝；而方向可控金字塔加入方向子带，从而得到一种多尺度、有方向、自逆且非混叠的表示。
1. The seam problem
The seam problem
2. Blend in every band
Blend in every band
3. Adding orientation
Adding orientation
4. Four transforms, one picture
Four transforms, one picture
5. Where the seam survives
Why does a single soft mask blended on the original image leave a visible seam between two textures, while blending inside the Laplacian pyramid removes it?
6. Choosing a transform family
A compression system must rebuild the image from as few numbers as the transform allows, with no redundancy. Which family fits, and what does it give up?
7. Mask levels for seven bands
Blending an image with 7 Laplacian band levels needs a Gaussian mask pyramid. Write the total number of mask levels including the residual.