A Composition of Mosaic Images based on MPEG Compressed Information 


Vol. 28,  No. 1, pp. 47-55, Jan.  2003


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  Abstract

This paper proposes a composition method of mosaic image from the compressed MPEG-2 video stream, in which the displacement between successive frames according to the camera operation is estimated directly from the information involved in the stream In the proposed method, the approximated optical flow is constructed from motion vectors of macro blocks, and it is used to determine the parameters of the displacements according to the camera operation associated with pan and tilt. The extracted parameters are used to determine the geometric transform of successive video frames in order to construct a mosaic image
The construction of mosaic uses several blending techniques including the one proposed by Nicoles in which an analytic weight is used to determine pixel values. Through the experiment, the blending technique based on analytic weights was superior to the others such as averaging and median-based techniques It provided more smooth changes in background and made use of instantaneous frame information to construct a mosaic The mosaic in the paper puts the emphasis on the reduction of computation because it is constructed from the motion vectors included in the compressed video without decoding and recalculating exact optical flows The constructed mosaic can be used in the retrieval of the compressed video as the representative frame of a shot

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  Cite this article

[IEEE Style]

J. Seol, S. Lee, J. Lee, "A Composition of Mosaic Images based on MPEG Compressed Information," The Journal of Korean Institute of Communications and Information Sciences, vol. 28, no. 1, pp. 47-55, 2003. DOI: .

[ACM Style]

Jung-kyu Seol, Seung-hee Lee, and Joonwhoan Lee. 2003. A Composition of Mosaic Images based on MPEG Compressed Information. The Journal of Korean Institute of Communications and Information Sciences, 28, 1, (2003), 47-55. DOI: .

[KICS Style]

Jung-kyu Seol, Seung-hee Lee, Joonwhoan Lee, "A Composition of Mosaic Images based on MPEG Compressed Information," The Journal of Korean Institute of Communications and Information Sciences, vol. 28, no. 1, pp. 47-55, 1. 2003.

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pISSN : 1226 - 4717
eISSN : 2287 - 3880