Efficient down-scaling of DCT compressed images

Details Efficient down-scaling of DCT compressed images Efficient down-scaling of DCT compressed images

2005-03-15

2005-03-15

Wu, Jingge (Department: 2621)

Image analysis

Image compression or coding

Transform coding

C375S240200

Reexamination Certificate

active

06868188

ABSTRACT:
In a method and a device for calculation of the Discrete Cosine Transform (DCT) only the DCT coefficients representing the first half and the second half of an original sequence are required for obtaining the DCT for the entire original sequence. The device and the method are therefore very useful when calculations of DCTs of a certain length is supported by hardware and/or software, and when DCTs of other sizes are desired. Areas of application are for example still image and video transcoding, as well as scalable image and/or video coding and decoding.

REFERENCES:
patent: 4293920 (1981-10-01), Merola
patent: 5107345 (1992-04-01), Lee
patent: 5293434 (1994-03-01), Feig et al.
patent: 5363096 (1994-11-01), Duhamel et al.
patent: 5452104 (1995-09-01), Lee
patent: 5479364 (1995-12-01), Jones et al.
patent: 5485279 (1996-01-01), Yonemitsu et al.
patent: 5485533 (1996-01-01), Hatano et al.
patent: 5528533 (1996-06-01), Kitaura et al.
patent: 5537440 (1996-07-01), Eyuboglu et al.
patent: 5541852 (1996-07-01), Eyuboglu et al.
patent: 5594678 (1997-01-01), Jones et al.
patent: 5835151 (1998-11-01), Sun et al.
patent: 5854858 (1998-12-01), Girod et al.
patent: 5870146 (1999-02-01), Zhu
patent: 6031572 (2000-02-01), Christopoulos
patent: 6192081 (2001-02-01), Chiang et al.
patent: 6577767 (2003-06-01), Lee
patent: 9841929 (1998-09-01), None
IEEE Transactions On Signal Processing, vol. 41, No. 1, Jan. 1993, pp. 480-485, N. Rama Murthy et al., “On a Novel Decomposition of the DCT and its Application”.
Digital Image Processing Volume, 1987 (Addison-Wesley Publishing Company), Reading, Mass et al., R.C. Gonzales et al., pp. 100-105; pp. 121-122.
U.S. patent application Ser. No. 09/394,428, filed Sep. 13, 1999 entitled “Down Scaling of Images”.

Affiliated with

Also associated with

Rating

Efficient down-scaling of DCT compressed images does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Efficient down-scaling of DCT compressed images, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Efficient down-scaling of DCT compressed images will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-3439518