An efficient compressed domain spatial transcoding scheme for adaptive video content delivery

  • Authors:

  • Nishant Khanwalkar;Shashikala Tapaswi;Manisha Pattanaik

  • Affiliations:

  • Department of Information Technology, Indian Institute of Information Technology and Management, Gwalior, MP, India;Department of Information Technology, Indian Institute of Information Technology and Management, Gwalior, MP, India;Department of Information Technology, Indian Institute of Information Technology and Management, Gwalior, MP, India

  • Venue:
  • PCM'10 Proceedings of the Advances in multimedia information processing, and 11th Pacific Rim conference on Multimedia: Part II
  • Year:
  • 2010

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Abstract

Video transmission over network is increasingly gaining popularities now-a-days. The heterogeneity of network has always been a problem for transmission because of various channels and communication links having different constraints (especially for wireless networks) and end devices having different capabilities. In this paper we solve the problem for end terminals having lower display and processing capabilities through spatial transcoding which allow downscaling of videos to lower resolution. In spatial transcoding for downscaled video the new motion vectors and coefficients for output frames need to be calculated. The convectional pixel domain approach for this is computationally very expensive. We propose an efficient spatial transcoding scheme in compressed domain for adaptive content delivery of video sequences. The downscaled motion vectors are refined to improve outgoing video quality. We implemented our proposed scheme and experiments are carried out for MPEG-1 video sequences, the results are found to be promising.