Image analysis – Color image processing – Compression of color images
Patent
1997-12-17
2000-07-04
Au, Amelia
Image analysis
Color image processing
Compression of color images
348587, 348592, H04N 975
Patent
active
060849827
ABSTRACT:
A method of performing chroma-key coding including the steps of defining color regions and quantifying the number of pixels in the regions, classifying macroblocks in accordance with the number of pixels thus quantified, assigning chroma complexity weights for use in the computation of quantization step-size based on the classification of the macroblocks, computing the quantization step-size, performing quantization and performing variable length coding.
REFERENCES:
patent: 5621466 (1997-04-01), Miyane et al.
patent: 5835158 (1998-11-01), Lowe
Horne et al., "Study of the Characteristics of the MPEG2 4:2:2 Profile--Application of MPEG2 in Studio Environment", IEEE Transactions on Circuits and Systems for Video Technology, vol. 6, No. 3, pp. 251-272, Jun. 1996.
"Televison Animation Store: Digital Chroma-Key and Mixer Units" by V.G. Devereux; BBC Research and Development Report, published 1984.
"A proposed Computer-Controlled Digital HDTV Chroma-Key System", by Z. Misawa et al, S.M.P.T.E. Journal, Mar. 1995.
Challapali Kiran
Chen Yingwei
Au Amelia
Philips Electronics North America Corp.
Prikockis Larry
Thorne Gregory L.
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