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The brain's ability to do "shadow removal" is really impressive. You can see it happening in the final example depicted in the article. I think this ability is
by cvoss 3y ago
The brain's ability to do "shadow removal" is really impressive. You can see it happening in the final example depicted in the article. I think this ability is what was used to explain "the dress". It also comes up in a classic optical illusion [0] where a checkerboard of light and dark gray squares has an object sitting on it and casting a shadow. The shadowed light gray squares are exactly the same shade as the unshadowed dark gray squares, but if you point this out to someone, they'll have a really hard time accepting it because they are so good at unconsciously accounting for shadows.
[0] https://en.wikipedia.org/wiki/Checker_shadow_illusion https://en.wikipedia.org/wiki/Checker_shadow_illusion
- aftbit 3y agoHey thanks, this one is new to me. 100% it is impossible to convince myself that those two squares are the same color. I have a camera looking over my driveway with motion detection that triggers all the time because of the shadow of a tree waving in the wind. My current weekend project is to use FastSAM to detect cars / animals / people in the driveway instead of just looking at a threshold of changed pixels. 1: https://github.com/CASIA-IVA-Lab/FastSAM https://github.com/CASIA-IVA-Lab/FastSAM
- thehappypm 3y agoIt's because the squares are not the same color. The alternating squares are different colors... in absence of a shadow. Your brain is correctly adjusting for the shadow to correctly identify the "true" color.