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US006859495B1
(12) United States Patent ao) Patent No.: us 6,859,495 Bi
Poon et al. (45) Date of Patent: Feb. 22,2005
(54) DIGITAL VIDEO FORMAT CONVERTER AND METHOD THEREFOR
(75) Inventors: Tommy C. Poon, Murray Hill, NJ
(US); Huifang Sun, Cranbury, NJ (US);
Jay Bao, Plainsboro, NJ (US); Anthony
Vetro, Staten Island, NY (US)
(73) Assignee: Mitsubishi Electric Research
Laboratories, Inc., Cambridge, MA
(US)
( * ) Notice: Subject to any disclaimer, the term of this patent is extended or adjusted under 35 U.S.C. 154(b) by 0 days.
(21) Appl. No.: 08/741,714
(22) Filed: Oct. 31, 1996
(51) Int. CI. II04N 7/12
(52) U.S. CI 375/240.21; 382/298; 348/445
(58) Field of Search 348/426, 398,
348/441, 342, 445, 420, 402, 392, 639, 413, 443, 427, 431, 437, 438, 408.1, 397, 395, 845.2, 403, 454; 358/141; 360/81; 375/240.21, 240.05, 240.2; 382/298
(56) References Cited
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OTHER PUBLICATIONS
Final Technical Report, Federal Comm. Commision, Advisory Committee on Advanced Television Services, Oct. 31, 1995.
"Hierarchical Decoder for MPEG Compressed Video Data," IEEE Trans, on Cons. Electronics, Aug. 1993, vol. 39, pp. 559-562, H. Sun.
"An SDTV Decoder with HDTV Capability: An All-format ATV Decoder," SMPTE Fall Conf., New Orleans, 1995, Boyce et al.
"Manipulation and Compositing of MC-DCT Compressed Video," Chang et al, IEEE, vol. 13, No. 1, Jan. 1995. Interframe Video Coding Using Overlapped Motion Compensation and Perfect Reconstruction Filter Banks—Hiroshisa Jozawa et al.—IEEE Trans. 1992, pp. IV-649-IV-652.
Frequency-Domain Motion Estimation Using a Complex Lapped Transform—Robert W. Young and Nick G. Kingsbury, Member, IEEE, IEEE Transaction on Image Processing vol. 2, No. 1 Jan. 1993.
* cited by examiner
Primary Examiner—Gims Philippe
(74) Attorney, Agent, or Firm—Dirk Brinkman; Andrew J. Curtin
(57) ABSTRACT
A digital video format converter and method therefor includes a first and second converter. The first converter receives a digital video signal and converts, in the frequency domain, inter-coded pictures in the digital video signal into intra-coded pictures. The first converter performs motion compensation in the frequency domain on the inter-coded pictures in the digital video signal to convert the inter-coded pictures into intra-coded pictures. The second converter down converts output of the first converter. Further signal processing then completes placing the digital video signal output by the second converter in a format acceptable to standard lower definition digital decoders.
4 Claims, 11 Drawing Sheets
