Title :
A maximum a posteriori estimator for high resolution video reconstruction from MPEG video
Author :
Altunbasak, Yucel ; Patti, Andrew J.
Author_Institution :
Georgia Tech. Res. Inst., Georgia Inst. of Technol., Atlanta, GA, USA
Abstract :
With the plummeting cost of video capture equipment and the availability of free applications allowing MPEG encoding, hobbiests can now affordably capture and encode their home videos for storage and transmission in MPEG format. To produce a high-quality still image from this archived MPEG video, motion compensation must be applied to a number of video frames. A great deal of work has been done formulating this problem in the spatial domain, however, the classical spatial domain formulations are suboptimal for transform-coded video. Patti and Altunbasak (see Proc. IEEE Int. Conf. Image Processing, 1999) proposed a POCS solution that directly incorporates the transform domain quantization information by working with the compressed bit stream. We present an alternative maximum a posteriori (MAP) solution that not only incorporates quantization information, but can also impose additional blocking artifact reduction constraints. We apply this new formulation to MPEG compressed video and demonstrate its effectiveness.
Keywords :
code standards; data compression; discrete cosine transforms; image reconstruction; image resolution; image sequences; motion compensation; parameter estimation; quantisation (signal); telecommunication standards; transform coding; video coding; DCT; MAP estimator; MPEG compressed video; MPEG encoding; MPEG format; POCS solution; blocking artifact reduction constraints; compressed bit stream; high resolution video reconstruction; high-quality still image; home video storage; home video transmission; maximum a posteriori estimator; motion compensation; spatial domain; transform domain quantization information; transform-coded video; video capture equipment; video frames; Availability; Costs; Image coding; Image processing; Image reconstruction; Maximum a posteriori estimation; Motion compensation; Quantization; Streaming media; Video compression;
Conference_Titel :
Image Processing, 2000. Proceedings. 2000 International Conference on
Conference_Location :
Vancouver, BC, Canada
Print_ISBN :
0-7803-6297-7
DOI :
10.1109/ICIP.2000.899792