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In CMOS image sensors tiny semiconductor variations cause a distortion of the image known as fixed pattern noise (FPN). With a good FPN compensation CMOS sensors can deliver very good image quality. Compensation algorithms differ in complexity, maximum frame rate, and compensation quality with thermal drift. This paper analyzes existing approaches to offset FPN compensation and their drawbacks. We...
This paper introduces the design of a high-speed 2K times 2K CMOS imaging system that is part of a Wide Field Monitor System proposed in China recent years. The CMOS sensor used in this imaging system is LUPA-4000 from Cypress corp. This CMOS camera is composed of an analogue system and a digital embedded system. The digital embedded system integrated with an NIOS II soft-core processor serves as...
We designed new photodiodes sensors including current mirror amplifiers. These photodiodes have been fabricated using a CMOS 0.6 micrometers process from Austria Micro System (AMS). The photodiode areas are respectively 1 mm ?? 1 mm and 0.4 mm ?? 0.4 mm with fill factor 98% and total chip area is 2 square millimetres. The sensor pixels show a logarithmic response in illumination and are capable of...
This paper reports a custom CMOS light sensor which can be used in a pyramid wavefront sensor based adaptive optics system for eye imaging. A pyramid sensor produces four pupil images and therefore, this CMOS light sensor consists of 4 arrays of 32 times 32 active reset pixels with synchronous analogue outputs. In an eye imaging adaptive optics system the light available for wavefront sensing is of...
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