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:
Jan. 16, 2001
Filed:
Mar. 12, 1997
Hee-Yong Kim, Plainsboro, NJ (US);
Edwin Robert Meyer, Bensalem, PA (US);
Ren Egawa, Princeton, NJ (US);
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A discrete cosine transform domain (DCT) filter for lowpass filtering a high resolution encoded video image represented as frequency-domain coefficient values, such as macroblocks, before decimation of the video image in the spatial domain. The DCT filter masks or weights the DCT coefficients of the video image macroblocks before processing by an inverse DCT. The filter may be implemented as a block mirror filter in the frequency domain, and the filter values may be combined with the IDCT coefficient values. Original motion vectors of the high resolution encoded video image are translated because low resolution reference images used by the decoder are not equivalent to the original high resolution images. Therefore, motion vectors are scaled to retrieve low resolution prediction blocks which are up-sampled to generate the original pixel and half-pixel values in the spatial domain. The up-sampled prediction block is added to the DCT filtered inverse-DCT transformed pixel values if the current macroblock is part of a non-intraframe encoded image. After motion compensation processing of the original macroblock, the reconstructed macroblock in the lower resolution is decimated accordingly.