Computer Vision Foundations · free preview
Everyday Cameras and Camera Clues
Round spots under trees, vanishing points that reveal camera orientation, and motion blur that encodes depth.
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.
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