In this paper

an encoding algorithm based on optimal SV (support vector) fitting was presented for lowbit-rate image description. The main contributions include: 1) a sample set shrinking strategy was suggested for fast simulation of the most significant AC coefficients in SVM (support vector machine) model. With almost the same accuracy as that of the traditional SVM approximation

the shrinking operation improved the regression speed and reduced the numbers of output parameter. 2) a BBB-DP(bit-by-bit differential prediction) method was suggested for DCs coding

the generation method of optimal bit stream was also proposed. Experiments demonstrated that our method saved coding time

while can acquire images of improved quality images at the same bit-rate. Unlike the previous SV coding

this rapid fitting based method is more feasible and describes the bit-stream structure in detail.