Digital video blue-screen editing in compressed domain

Bo Shen; Ishwar K. Sethi; Bhaskaran Vasudev

doi:10.1117/12.263309

10 January 1997 Digital video blue-screen editing in compressed domain

Bo Shen, Ishwar K. Sethi, Bhaskaran Vasudev

Proceedings Volume 3024, Visual Communications and Image Processing '97; (1997) https://doi.org/10.1117/12.263309
Event: Electronic Imaging '97, 1997, San Jose, CA, United States

Abstract

Chroma-keying or blue screen matting is an important video editing operational. In blue screen matting, everything in the image that has the 'user specified level for the blue channel' is 'keyed' out and replaced by either another image or a color from a color generator. We develop a technique for blue screen matting that manipulates the image when the information for the image is available only in compressed form such as a JPEG or MPEG bitstream. Specifically, for the compressed domain approach, we show that the matting process is a convolution operation; hence, we develop a DCT convolution theorem. The DCT convolution theorem can be used to show that the compressed domain approach proposed in this paper provides a significant reduction in computation complexity compared to previously developed approaches which were mostly adhoc techniques. The convolution theorem exploits the sparseness as well as the orthogonality of the data available in the DCT domain and thus yields an efficient algorithm for he chroma-keying or blue screen matting. The algorithm extends to the DCT domain concepts such as alpha channel and premultiplied alpha. The method is also extended to MPEG video domain wherein we explore the efficiency of the matting process when interframe coding is used.

Citation Download Citation

Bo Shen, Ishwar K. Sethi, and Bhaskaran Vasudev "Digital video blue-screen editing in compressed domain", Proc. SPIE 3024, Visual Communications and Image Processing '97, (10 January 1997); https://doi.org/10.1117/12.263309

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