Computer Vision Foundations · free preview
The Pinspeck Camera
Putting an occluder inside an open camera records a shadow, and the missing light is the picture.
1. Turning the design inside out
Turning the design inside out
2. Writing the matrix as a complement
Writing the matrix as a complement
3. Reading the missing light
Reading the missing light
4. Why the trick is worth knowing
Why the trick is worth knowing
5. Why the pinspeck is bright
A pinspeck camera and a pinhole camera are built with apertures of the same size, and the pinspeck replaces a pinhole's open area with a small blocker. Why does the pinspeck collect far more light?
6. Recovering the picture from the shadow
A pinspeck camera records a bright uniform field with a small dark mark where the blocker prevents light from one world sample from arriving. What operation recovers the world sample that the mark encodes?
7. The missing light
A flatland pinspeck camera with a fully open aperture would read a total of units, and the blocker hides a world sample worth units. Compute the reading at the sensor element in the shadow and write the number.
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