An Hadamard transform chip using the PWM circuit technique and its application to image processing

Katayama Kousuke, Iwata Atsushi, Morie Takashi, Nagata Makoto

Research output: Contribution to journalArticle

1 Citation (Scopus)


A circuit that carries out an Hadamard transform of an input image using the pulse width modulation technique is proposed. The proposed circuit architecture realizes the function of an Hadamard transform with a full-size pixel image. A test chip that we designed and fabricated integrates 64 × 64 pixels in a 4.9mm × 4.9mm area, with 0.35 μm CMOS technology. The functional operation and linearity of this chip are measured. An image processing application utilizing this chip is demonstrated.

Original languageEnglish
Pages (from-to)1596-1603
Number of pages8
JournalIEICE Transactions on Electronics
Issue number8
Publication statusPublished - 2002 Aug



  • Charge sharing
  • Hadamard transform
  • Image sensor
  • Pulse width modulation technique

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

Cite this