Efficient coding algorithm for affine motion parameters
Yun-Ho Ko, Jae Gark Choi, Sun-Jae Cho, Seong-Dae Kim · Optical Engineering · 2001
We describe an efficient method for the coding of the affine motion parameters. Conventional direct quantization method consists of a linear quantizer and an entropy coder. Although this is the easiest way to code affine parameters, it has some problems. First, its implementa- tion requires too many quantizers and entropy code tables. Second, the direct quantization method does not take into account the interrelation- ship between the parameters. Therefore, it shows much degradation af- ter motion compensation if the bit rates allocated to the parameters for the transmission or the storage are reduced. To overcome these prob- lems, we propose a new method that deduces the real translational mo- tion from the six affine motion parameters, which have more physical meaning and a strong temporal correlation. In addition, the scaling and rotational motion are transformed into 2-D vector elements, and then the vector quantization method is used to code them. Simulation results show that our proposed scheme provides better performance than the conventional direct quantization method. © 2001 Society of Photo-Optical In-