Since the traditional H.261/3 and MPEG-1/2 standards employ the block-based compression algorithm

decoded images are suffered from severely blocky artifacts and mosquito effects at low bit rate. To overcome these weakness

object-based video coding approaches are proposed which segment each image into regions of coherent motion.However

the estimation of more complex motion model is required a lot of times and a large amount of computations is

therefore

unavoided.In this paper

a fast temporal-spatio segmentation algorithm is presented using quadric spatial transfirmations motion model.Based on the image spatial segmentation and the estimation of the parameters of quadric spatial transformations motion model

the amount of computation for temporal-spatio segmentation is efficiently decreased through the linearization the estimating for model parameters、Householder transformation and the fast approach forR、zmatrix.