A subband coding technique for image compression in single CCD cameras with Bayer color filter arrays

Author

Toi, Takao ; Ohita, M.

Author_Institution

Silicon Syst. Res. Lab., NEC Corp., Kanagawa, Japan

Volume

45

Issue

1

fYear

1999

fDate

2/1/1999 12:00:00 AM

Firstpage

176

Lastpage

180

Abstract

This paper presents a subband coding technique suitable for image compression in a single CCD camera with a Bayer color filter array (CFA). In it, we have applied a SSKF (symmetric short kernel filter) both horizontally and vertically to red and blue color signals, and a two dimensional perfect reconstruction filter to green color signals. Here, we compare this technique to two other image compression methods: DPCM and the Hadamard transform, each of which also allows an output signal from the CCD in a color camera to be compressed directly with simple logic circuitry and is suitable for use in low cost video conference cameras. Simulation results demonstrate that the subband coding offers the best quality (27-30 dB) with a compression ratio of approximately 2 bit/pel

Keywords

CCD image sensors; channel bank filters; data compression; image colour analysis; two-dimensional digital filters; video cameras; video coding; Bayer color filter arrays; color signals; image compression; logic circuitry; output signal; single CCD cameras; subband coding technique; symmetric short kernel filter; two dimensional perfect reconstruction filter; video conference cameras; Charge coupled devices; Charge-coupled image sensors; Costs; Filters; Image coding; Image reconstruction; Kernel; Logic circuits; Video compression; Videoconference;

fLanguage

English

Journal_Title

Consumer Electronics, IEEE Transactions on

Publisher

ieee

ISSN

0098-3063

Type

jour

DOI

10.1109/30.754434

Filename

754434