1.2.2 Color Ambiguity (1)

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Nov 24, 2024

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PSYC 224 Cognitive Psychology Perception Color ambiguity
Example: Determining color (1 of 2) Think about how to design a system that detects whether an object is red, blue, or purple… The perceived color of objects depends on what frequencies of light those objects absorb vs reflect. Perception – Color ambiguity – 2
Example: Determining color (1 of 2) • Assume red objects reflect 80% of the red light that hits them and only 10% of the blue light. • Assume purple objects reflect 50% red, 50% blue. • Assume blue objects reflect 80% of the blue light and 10% of the red. 3 Perception – Color ambiguity –
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Simple color determination Light comes in with 100 units of red and 100 units of blue frequency: Red object Purple object Blue object Red freq 80 50 10 Blue freq 10 50 80 4 Perception – Color ambiguity –
Light sources differ (1 of 2) But what if the light source changes? 5 Perception – Color ambiguity –
Light sources differ (2 of 2) Light comes in with 10 units of red and 190 units of blue : Red object Purple object Blue object Red freq 8 5 1 Blue freq 19 95 152 6 Perception – Color ambiguity –
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Not-so-simple color determination Light comes in with 100 units of red and 100 units of blue: Red object Purple object Blue object Red freq 80 50 10 Blue freq 10 50 80 Light comes in with 10 units of red and 190 units of blue : Red object Purple object Blue object Red freq 8 5 1 Blue freq 19 95 152 7 Perception – Color ambiguity –
How do we solve this? (1 of 4) 8 © Edward H. Adelson/ CC BY-SA 4.0 / https://tinyurl.com/y5tvuxtc Perception – Color ambiguity –
How do we solve this? (2 of 4) 9 © Edward H. Adelson/ CC BY-SA 4.0 / https://tinyurl.com/y5tvuxtc Perception – Color ambiguity –
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How do we solve this? (3 of 4) © Edward H. Adelson/ CC BY-SA 4.0 / https://tinyurl.com/y5tvuxtc 10 Perception – Color ambiguity –
How do we solve this? (4 of 4) © Edward H. Adelson/ CC BY-SA 4.0 / https://tinyurl.com/y5tvuxtc The brain determines shade or color by NORMALIZING (comparing those colors/shades across the scene) 11 Perception – Color ambiguity –
Colors are judged relative to nearby colors 12 Perception – Color ambiguity –
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