Computer Vision Foundations · 免费预览
景深与望远镜
弥散圆与景深公式、凹透镜及其虚焦点，以及由两片透镜构成的伽利略望远镜。
1. Focus is not all or nothing
Focus is not all or nothing
2. The f-number and the depth of field law
The f-number and the depth of field law
3. Concave lenses and virtual focus
Concave lenses and virtual focus
4. A telescope from two lenses
A telescope from two lenses
5. Stopping down the aperture
A ruler is photographed from a fixed distance at f/2, then at f/4, then at f/8, with the camera position unchanged and the focus left alone. What happens to the band of numbers that reads as sharp?
6. What makes the rays emerge parallel
A Galilean telescope must send out parallel rays when parallel rays arrive, so that the eye can view the image without straining. What arrangement of the two lenses achieves this?
7. Telescope magnification
A Galilean telescope is built with a convex objective of focal length centimeters and a concave eyepiece of focal length centimeters. Using , compute the magnification and write the number.