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A Bio-Inspired AER Temporal Tri-Color Differentiator Pixel Array.
IEEE Transactions on Biomedical Circuits and Systems
|November 6, 2015
Summary
This study presents a bio-inspired vision sensor that detects color transitions using voltage spikes, mimicking neural signals. This novel sensor offers high-speed, real-time color change detection for various applications.
Area of Science:
- Neuromorphic Engineering
- Biomimetic Sensors
- Computer Vision
Background:
- Mammalian retinas exhibit retinal color opponency for efficient visual processing.
- Traditional vision sensors often lack the speed and efficiency of biological systems in detecting rapid color changes.
Purpose of the Study:
- To develop a bio-inspired vision sensor mimicking retinal color opponency.
- To enable high-speed detection of color transients using event-based processing.
Main Methods:
- Fabrication of a vision sensor with three stacked photodiodes per pixel using TSMC 90 nm CMOS technology.
- Implementation of in-pixel color processing inspired by retinal color opponency.
- Utilizing the Address Event Representation (AER) protocol for off-chip data transmission.
- Development of a post-processing method for real-time color transition decoding.
Main Results:
- The sensor successfully detects color transitions at high speeds (up to 2.7 kHz).
- Achieved a dynamic range of 58 dB and a power consumption of 22.5 mW.
- Demonstrated real-time display of color changes in visual scenes.
Conclusions:
- The bio-inspired vision sensor effectively captures transient color shifts.
- The sensor's performance is suitable for applications in industrial automation, robotics, and automotive systems.
- This technology offers a novel approach to event-based color sensing.
