A high-resolution CMOS image sensor with Hadamard transform function

Kousuke Katayama*, Atsushi Iwata


研究成果: Article査読


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.

ジャーナルIEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
出版ステータスPublished - 2003 2月

ASJC Scopus subject areas

  • 信号処理
  • コンピュータ グラフィックスおよびコンピュータ支援設計
  • 電子工学および電気工学
  • 応用数学


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