The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 10, 2003
Filed:
Jun. 26, 2002
Jungwoo Lee, Monmouth Junction, NJ (US);
Sarnoff Corporation, Princeton, NJ (US);
Abstract
An input encoded video bitstream conforming to a first DCT-based image compression standard (e.g., MJPEG or DV) is converted into an output encoded video bitstream conforming to a second DCT-based image compression standard (e.g., MPEG) without having to fully decode the first bitstream according to the first image compression standard and without having to fully encode according to the second image compression standard in order to generate the output bitstream. Rather, a partial video decoder of a transcoding system applies steps of the first image compression standard to the input bitstream to generate dequantized DCT coefficient data. A DCT data converter of the transcoding system then processes the dequantized DCT coefficient data in the DCT domain as necessary to enable a partial video encoder of the transcoding system to apply steps of the second image compression standard to the converted DCT coefficient data in order to generate the output bitstream. The processing performed in the DCT domain by the partial video encoder includes motion estimation at block boundaries.