A self-calibrating single-chip CMOS camera with logarithmic response

Abstract

A high-dynamic-range CMOS image sensor consisting of nonintegrating, continuously working photoreceptors with logarithmic response is presented. The nonuniformity problem caused by the device-to-device variations is greatly reduced by an implemented analog self-calibration. After performing this calibration, the remaining fixed pattern noise amounts to 3.8% (RMS) of an intensity decade at a uniform illumination of 1 W/m/sup 2/. The sensor provides a resolution of 384/spl times/288 pixels and a dynamic range of 6 decades in the intensity region from 3 mW/m/sup 2/ to 3 kW/m/sup 2/. It contains all components required for operating as a camera-on-a-chip. The image data can be read out either via a single analog line (video standard) or via a digital interface after undergoing an analog-to-digital conversion on the chip. Additional features like automatic exposure control, averaging of adjacent pixels, and digital zoom have been implemented, making the sensor suitable for a wide field of applications.

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