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7 September 1998 CMOS image sensor that outputs Walsh-Hadamard coefficents
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Proceedings Volume 3410, Advanced Focal Plane Arrays and Electronic Cameras II; (1998)
Event: SYBEN-Broadband European Networks and Electronic Image Capture and Publishing, 1998, Zurich, Switzerland
Waish-Hadamard transformation is one of the most interesting linear transformations in image processing domain. The particularity of Walsh-Hadamard transformation is that it uses a set of basis functions which contain only +1 and -1, this results in a direct and simple computation without multiplication. This simplicity can not only reduce the complexity of the conventional digital processing unit, but also make possible some special rn-sensor cellular computation. This paper presents an original CMOS image sensor which can output directly the coefficient Waish-Hadamard of the sensed image. When the pixel i,jis addressed, it outputs the coefficient ij of the transformation Walsh-Hadamard instead of the gray level of pixel ij in a conventional image sensor. This image sensor has the following advantages : 1 0 gray level image can be reconstructed from partially read coefficients. This permits possible exchange between sensor output bandwidth and reconstructed image resolution, for example only quarter of coefficients can give a pretty good image; 2° some transformation based algorithms such as pattern recognition, image compression, etc. can use directly the sensor output without any hardware/software cost.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Yang Ni "CMOS image sensor that outputs Walsh-Hadamard coefficents", Proc. SPIE 3410, Advanced Focal Plane Arrays and Electronic Cameras II, (7 September 1998);


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