CMOS image sensor that outputs Walsh-Hadamard coefficents

Yang Ni

doi:10.1117/12.323999

7 September 1998 CMOS image sensor that outputs Walsh-Hadamard coefficents

Yang Ni

Proceedings Volume 3410, Advanced Focal Plane Arrays and Electronic Cameras II; (1998) https://doi.org/10.1117/12.323999
Event: SYBEN-Broadband European Networks and Electronic Image Capture and Publishing, 1998, Zurich, Switzerland

Abstract

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.

Citation Download Citation

Yang Ni "CMOS image sensor that outputs Walsh-Hadamard coefficents", Proc. SPIE 3410, Advanced Focal Plane Arrays and Electronic Cameras II, (7 September 1998); https://doi.org/10.1117/12.323999

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available