In this brain lecture I explain what is contrast stretching in the brain and why it is important for human brain.
Contrast stretching is an algorithmic process that is raising contrast in the perceived image on expense of correct perception of color and brightness values. As a consequence of this process we perceive many colors and brightness values as false compared to the actual values that are entering our brain.
Four famous optical “illusions” are presented in this lecture to demonstrate this process: chessboard illusion, gradient illusion, red strawberries illusion and face with colored iris illusion.
Lecture also explains that terms “color constancy” and “simultaneous contrast” known from neurosciences are nonsensical because all the brain is doing here is adjusting contrast.
-------- Contents of this brain lecture --------
00:00 - Start of the video with this lecture website URL's in QR-codes
00:07 - Donate cryptocurrency to support my lectures & videos
00:15 - Start of the lecture (introduction to contrast stretching in the brain)
01:02 - Theory about contrast
04:29 - Optical illusion #1: Chessboard squares of same brightness
10:45 - Optical illusion #2: Center stripe with false grayscale gradient
14:02 - Optical illusion #3: Red strawberries that are not red
20:20 - Optical illusion #4: Face with falsely perceived colored iris
23:35 - Conclusions learned from this lecture
25:02 – Explanation why term “Color constancy” is wrong
26:30 – Explanation why term “Simultaneous contrast” is wrong
27:07 - Acknowledgments
27:38 - Last question
27:54 - Brain algorithms (trailer)
28:04 - Copyright & author's website URL in QR-code
28:08 - Author's recommended videos (feature available only on YouTube)
