Artificial retina chip made of a 128 x 128 pn-np variable-sensitivity photodetector array
Abstract
An artificial retina chip is an image detection device that, like biological retinas, can extract essential features directly from projected images. This paper presents an artificial retina chip consisting of a 128 x 128 array of pn-np variable-sensitivity photodetectors (VSPD's). This photodetector (PD) utilizes pn junctions and thus avoids the rather inflexible memory effect encountered in our previously reported device, which used Schottky contacts in a metal-semiconductor-metal (MSM) configuration. We introduce a novel 'filter division' method for arbitrary two-dimensional (2-D) filter operation, and successfully employ it in a 2-D edge extraction task.
- Publication:
-
IEEE Photonics Technology Letters
- Pub Date:
- February 1995
- DOI:
- 10.1109/68.345918
- Bibcode:
- 1995IPTL....7..188F
- Keywords:
-
- Chips (Electronics);
- Image Analysis;
- Image Processing;
- P-N Junctions;
- Photometers;
- Retina;
- Spectral Sensitivity;
- Vision;
- Edge Detection;
- Extraction;
- Microprocessors;
- Msm (Semiconductors);
- Schottky Diodes;
- Electronics and Electrical Engineering