Computer Vision Foundations · 免费预览
日常相机与相机线索
树下圆形的光斑、揭示相机朝向的消失点，以及编码深度的运动模糊。
1. Round spots under a tree
Round spots under a tree
2. Horizontal or vertical
Horizontal or vertical
3. Why photos blur from a moving car
Why photos blur from a moving car
4. What the round spots under a tree are
On a sunny day, the light spots under a tree are round even though the gaps between leaves have irregular shapes. What is the correct explanation?
5. Reading vanishing points
A line drawing of a tiled surface is rotated 90 degrees, and the perception flips from a horizontal floor to a vertical wall. Which geometric quantity changed enough to flip the interpretation?
6. How far the blur reaches
A car photographs the same street twice with the same exposure time. In photo A the car moves at 10 meters per second, and in photo B the car moves at 30 meters per second. Photo A shows a streak of 4 pixels on a nearby sign. How many pixels of streak does the same sign show in photo B, assuming blur grows in proportion to camera speed during the exposure? Write the number.