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Trellis-based R-D optimal quantization in H.263+

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3 Author(s)
Jiangtao Wen ; PacketVideo Corp., San Diego, CA, USA ; Luttrell, M. ; Villasenor, J.

We describe a trellis-based algorithm which enables R-D optimum quantization decisions in the H.263+ video coding standard. The algorithm allows the quantization decisions for all coefficients in a block to be made jointly, and experiments conducted using H.263+ for video coding rates of 40-50 kbps show an average improvement of 3.5% in bitrate relative to implementations which follow the International Telecommunications Union (ITU) Test Model specifications in making quantization decisions

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Image Processing, IEEE Transactions on  (Volume:9 ,  Issue: 8 )