Lecture 7
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Transcript of Lecture 7
Outline
• The eye and the retina• Artificial Vs biological vision systems• Fundamentals of photo receptors • Read-out strategies• Examples of neuromorphic vision systems• Further processing
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Outline
• The eye and the retina• Artificial Vs biological vision systems• Fundamentals of photo receptors • Read-out strategies• Examples of neuromorphic vision systems• Further processing
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Frame-based Sensors Vs Biological Vision
Artificial Vision Biological Systems
Frame-based Continuous Detection
Global AGC Local AGC
Redundancy Low redundancy
High power consumption Low power consumption
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Dynamic Range
Rüedi et al, JSSC 2003 ”A 128x128 Pixel 120dB Dynamic-Range Vision-Sensor Chip for Image Contrast and Orientation Extraction”
Bad choice of the integration time
The human eye has a dynamic range higher than 10 decades
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Outline
• The eye and the retina• Artificial Vs biological vision systems• Fundamentals of photo receptors • Read-out strategies• Examples of neuromorphic vision systems• Further processing
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Some Possible Photodetectors in CMOS Technology
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A. Moini. ‘Vision Chips’. Kluwer Academic Publishers, 2000.
Outline
• The eye and the retina• Artificial vision Vs biological systems• Fundamentals of photo receptors • Read-out strategies• Examples of neuromorphic vision systems• Further processing
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Read-out Strategies:
Addressing/Scanning Charge Coupled Devices (CCD) Address Event Representation (AER)
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Outline
• The eye and the retina• Artificial Vs vision biological systems• Fundamentals of photo receptors • Read-out strategies• Examples of neuromorphic vision systems• Further processing
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Dynamic Vision Sensor (DVS)
P. Lichtsteiner, C. Posch, and T. Delbrück, “A 128x128 120dB 15µs latency asynchronous temporal
contrast vision sensor,” IEEE J. Solid-State Circuits, vol. 43, no. 2, pp. 566–576, Feb. 2008.
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Examples of Biomorphic Vision Sensors
Spatio-Temporal Contrast Detector:http://folk.uio.no/juanle/Projects/Spatial_contrast_retina.html
Dynamic Vision Sensor:http://folk.uio.no/juanle/Projects/DVS.html
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Outline
• The eye and the retina• Artificial vision Vs biological systems• Fundamentals of photo receptors • Read-out strategies• Examples of neuromorphic vision systems• Further processing
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