This paper presents a new method, based on gray-scale mathematical morphology, called bitwise decomposition. Aimed at visual prosthetics, the design is compact and portable. The use of the proposed gray-scale erosion allows for on-pixel image processing and a higher fill factor. The design is based on Digital Pixel Sensors, where analog-to-digital conversion is carried out next to the photodiode. The advantages are faster readout and better reliability. Implemented in 0.13 μm CMOS technology, the design achieves a fill factor of 22%. The pixel array needs only a minimum of external control and processing circuitry to produce an edge image.

Additional Metadata
Persistent URL dx.doi.org/10.1109/MWSCAS.2007.4488541
Conference 2007 50th Midwest Symposium on Circuits and Systems, MWSCAS - Conference
Citation
Jabakhanji, D. (Duha), & Shams, M. (2007). A CMOS imager with on-pixel gray-scale erosion. Presented at the 2007 50th Midwest Symposium on Circuits and Systems, MWSCAS - Conference. doi:10.1109/MWSCAS.2007.4488541