Title :
Rate-distortion optimized motion smoothing for MPEG-2 encoding
Author_Institution :
Sarnoff Corp., Princeton, NJ, USA
Abstract :
A new bit allocation technique between motion vectors and DCT coefficients for MPEG-2 encoding is presented. In MPEG-2 encoding, the differential between two neighboring motion vectors is losslessly encoded by a Huffman table. In order to adjust the bit allocation for the motion vectors, a motion vector smoothing approach is taken. The motion vectors are smoothed by a low pass filter when the bit allocation for the motion vector has to be reduced. An algorithm based on the Lagrange multiplier is used to achieve the optimal balance between motion vector smoothing and DCT coefficients quantization
Keywords :
Huffman codes; discrete cosine transforms; low-pass filters; motion estimation; optimisation; rate distortion theory; smoothing methods; transform coding; video coding; DCT coefficients; DCT coefficients quantization; Huffman table; Lagrange multiplier; MPEG-2 encoding; bit allocation technique; low pass filter; motion vectors; neighboring motion vectors; rate-distortion optimized motion smoothing; Bit rate; Costs; Discrete cosine transforms; Encoding; Lagrangian functions; Low pass filters; Motion estimation; Nonlinear filters; Quantization; Rate-distortion; Smoothing methods; Vectors;
Conference_Titel :
Image Processing, 1997. Proceedings., International Conference on
Conference_Location :
Santa Barbara, CA
Print_ISBN :
0-8186-8183-7
DOI :
10.1109/ICIP.1997.638669
