A high-resolution CMOS image sensor with Hadamard transform function

Kosuke Katayama, Atsushi Iwata

Research output: Contribution to journalArticle

Abstract

This paper proposes a high-resolution CMOS image sensor, which has Hadamard transform function. This Hadamard transform circuit consists of two base generators, an array of pixel circuits, and analog-to-digital converters. In spite of simple composition, a base generator outputs a variety of bases, a pixel circuit calculates a two-dimensional base from one-dimensional bases and outputs values to common line for current addition, and analog-to-digital converter converts current value to digital value and stabilize a common line voltage for elimination of parasitic capacitance. We simulated these circuit elements and optimized using SPICE. Basic operations of this Hadamard transform circuit are also confirmed by simulation. A 256 × 256 pixel test chip was designed in 4.73mm × 4.73mm area with 0.35μm CMOS technology. A fill factor of this chip is 42% and dynamic range is 55.6 [dB], Functions of this chip are Hadamard transform, Harr transform, projection, obtaining center of gravity, and so on.

Original languageEnglish
Pages (from-to)396-403
Number of pages8
JournalIEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
VolumeE86-A
Issue number2
Publication statusPublished - 2003
Externally publishedYes

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Keywords

  • Functional image sensor
  • Hadamard transform
  • Orthogonal transform

ASJC Scopus subject areas

  • Signal Processing
  • Computer Graphics and Computer-Aided Design
  • Applied Mathematics
  • Electrical and Electronic Engineering

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