sang wook hong. segmenting objects from their backgrounds learning about the properties of objects...
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Sang Wook Hong
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Segmenting objects from their backgrounds
Learning about the properties of objects
Signaling
Color coding
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Segmenting objects from their backgrounds
Learning about the properties of objects
Signaling
Color coding
![Page 4: Sang Wook Hong. Segmenting objects from their backgrounds Learning about the properties of objects Signaling Color coding](https://reader036.vdocuments.site/reader036/viewer/2022062305/5697bf7a1a28abf838c82bdb/html5/thumbnails/4.jpg)
Segmenting objects from their backgrounds
Learning about the properties of objects
Signaling
Color coding
![Page 5: Sang Wook Hong. Segmenting objects from their backgrounds Learning about the properties of objects Signaling Color coding](https://reader036.vdocuments.site/reader036/viewer/2022062305/5697bf7a1a28abf838c82bdb/html5/thumbnails/5.jpg)
Segmenting objects from their backgrounds
Learning about the properties of objects
Signaling
Color coding
![Page 6: Sang Wook Hong. Segmenting objects from their backgrounds Learning about the properties of objects Signaling Color coding](https://reader036.vdocuments.site/reader036/viewer/2022062305/5697bf7a1a28abf838c82bdb/html5/thumbnails/6.jpg)
Segmenting objects from their backgrounds
Learning about the properties of objects
Signaling
Color coding
“Providing Jobs to researchers”
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In the ‘Light’?
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Metamers: Two lights that have different wavelengthdistributions but are perceptually identical
580530 + 620
wavelength
intensity
wavelength
intensity
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Color induction: Color appearance is affected by nearby light
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This isn't real...This isn't real...
What is "real"? How do you What is "real"? How do you define "real"? define "real"? If you're talking about what If you're talking about what you can feel, what you can smell, you can feel, what you can smell, what you can taste and see, what you can taste and see, then "real" is simply electrical then "real" is simply electrical signals signals interpretedinterpreted by your brain... by your brain...
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Color is in the Brain
Perceived color is a neural representation for the lightreflected from a target object
A I AI
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Hue: The experience of a chromatic color such as red, green,yellow, or blue or combinations of these colors
Saturation: The relative amount of whiteness in a chromaticcolor
Brightness: Perceived light level
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Reflected light from objects
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Reflectance Color Appearance
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Hermann von Helmholtz (1821 - 1894)
Actually, I just got the idea fromThomas Young (1773 - 1829)
color vision depends on the activity of three different receptor mechanisms
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Color Matching Experiment
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Color Matching Experiment
400 500 600 700
Pri
mar
y in
tens
ity “Our perception of color may
be determined by the ratio
of activity in three receptor
mechanisms with different
spectral sensitivities.”
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S MM L
Blue
Red
YellowYellow
Gray
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Is there a color appearing bluish yellow or yellowish blue?
Is there a color appearing reddish green or greenish red?
Ewald Hering (1834 - 1918)
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Hue Cancellation Experiment: Jameson & Hurvich (1955)
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Electrophysiological recordings from color and spatially opponent
midget ganglion cell in the monkey retinaGreen On/Red OFF
+M-L
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Bistratified ganglion cell
Dacey (1996)
counter-phase modulation between blue andred+green(luminance)
isolated S-cone modulation