Image analysis – Image compression or coding – Quantization
Patent
1997-04-14
1999-05-11
Boudreau, Leo H.
Image analysis
Image compression or coding
Quantization
382239, G06K9/00
Patent
active
059036796
ABSTRACT:
A method for producing a decoded signal approximate to an original signal upon decoding a quantized signal which is produced by vector-quantizing every block of an original signal or by vector-quantizing every block of a transform coefficient obtained after every block of the original signal is processed by a transform process such as a discrete cosine transform (DCT). The method includes the steps of determining a narrow vector quantization constraint set domain in which each vector or block divided from the decoded signal exists prior to the vector quantization at the transmitting site, and outputting a signal indicative of the determined narrow vector quantization constraint set domain, and performing a projection for returning a vector existing beyond the narrow vector quantization constraint set domain to its original domain, and repeating the projection for returning a vector existing beyond the narrow vector quantization constraint set domain to its original domain.
REFERENCES:
patent: 5534925 (1996-07-01), Zhong
patent: 5610729 (1997-03-01), Nakajima
patent: 5699481 (1997-12-01), Shlomot et al.
patent: 5712927 (1998-01-01), Kim et al.
patent: 5787204 (1998-07-01), Fukuda
patent: 5799110 (1998-08-01), Israelsen et al.
patent: 5802208 (1998-09-01), Podilchuk et al.
Ramamurthi, Bhaskar and Allen Gersho, "Nonlinear Space-Variant Postprocessing of Block Coded Images", IEEE Transactions on Acoustics, Speech, and Signal Processing, vol. assp-34, No. 5, pp. 1258-1268. Oct. 1986.
Yang, Yongyi, Nikolas P. Galatsanos and Aggelos K. Katsaggelos, "Regularized Reconstruction to Reduce Blocking Artifacts of Block Discrete Cosine Transform Compressed Images", IEEE Transactions on Circuits and Systems for Video Technology, vol. 3, No. 6, pp. 421-432. Dec.1993.
Zakhor, Avideh, "Iterative Procedures for Reduction of Blocking Effects in Transform Image Coding", IEEE Transactions on Circuits and Systems for Video Technology, vol. 2, No. 1, pp. 91-95. Mar. 1992.
Boudreau Leo H.
Korea Telecommunication Authority
Tadayon Bijan
LandOfFree
Method for decoding signal vector-quantized by blocks does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for decoding signal vector-quantized by blocks, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for decoding signal vector-quantized by blocks will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-252301