sensing and the imaging process (ii)ben-shahar/teaching/computational-vision… · sensing and the...
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Sensing and the Imaging Process
(II)
Introduction to Computational and Biological Vision
CS 202-1-5261
Computer Science Department, BGU
Ohad Ben-Shahar
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The human eye
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The human eye
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The human eye
Pinhole camera model
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The human eye
Pinhole camera model
wP
hP
iP
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The human eye
The retina:
The biological image plane
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The human eye
Aside – Neural signaling and communication
Retinal bipolar cell Cerebellar
pyramidal cell
Cerebellar
Purkinje cell
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The human eye
Aside – Neural signaling and communication
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The human eye
Aside – Neural signaling and communication
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The human eye
The retina
Variety of cells:
Photoreceptors: ~100 million (95% rods,5% cones)
Bipolar cells
Ganglion cells
Amacrine cells
Horizontal cells
Optic nerve:
Made of axons of secondary (ganglion) neurons
~1 million axons
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The human eye
A defective design?
Light
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The human eye
The optic disk and the blind spot
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The human eye
The optic disk and the blind spot
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The human eye
Rods and cones
Rods:
•Extremely sensitivity to light
•Single photon response
•Low spatial resolution
•Single response profile
•B&W night vision (scotopic)
Cones:
•Relatively insensitive to light
•100 photos for response comparable with rods
•High spatial resolution
•Different (3 types of) response profiles
•Color daylight vision (photopic)
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The human eye
Rods and cones
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The human eye
Rods and cones
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The human eye
Rods and cones: distribution across the retina
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The human eye
The fovea (“pit”)
•Extremely high density of cone receptors
•Few rods. None in the foveola.
•Displaced neural layers
•No blood vessels
•1-1 relationship with bipolar and ganglion cells
1.2 mm
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The human eye
The fovea: distribution of optic fibers