This paper presents a smart sensor for an eye tracker using pixel-level analog image processing to eliminate the needs of many peripherals and the high power consumption of the conventional eye trackers. The pixel-level image processing was implemented with floating gate capacitors and nonlinear circuit computations. The prototype chip was fabricated for an 80 \,×\,60 smart CMOS Image Sensor (CIS) pixel array whose pixel pitch is 22.4 \,×\,22.4 μ m2 in a 0.35-μ m CMOS process. The test results show 2 pixel error and 200- μ s processing time. The power consumption is 100 mW with a 3.3 V supply voltage and the silicon area is 7.5 mm2.
Bibliographical noteFunding Information:
The authors are grateful to Jihyun Cho and Seunghyun Lim for their assistance in designing and testing. The prototype chip fabrication was supported by Samsung Electronics Co. Ltd.
All Science Journal Classification (ASJC) codes
- Electrical and Electronic Engineering