分形编码中的最优压缩映射

提高传统分形压缩编码的性能。方法将分形变换编码建模为一个不等式约束条件下的非线性规划问题，将压缩射条件作用到最优射的求解过程中，得到全局意义上的最优压缩映射，给出了该模型及相应的求解算法，对算法收敛性，初始点选择等问题进行了讨论。

Optimal Contractive Map in Fractal Coding

Aim\ To improve the performance of fractal compression coding Methods A new idea was proposed in which the fractal coding process was modeled as a nonlinear program with inequality constraints As a result, the global optimal solution of contractive map was obtained directly because the constraint conditions were considered during the solution for optimal map The optimal model as well as the algorithm for solution was presented The convergence of the algorithm and the best choice of initial point were also discussed Results Coding result of the proposed method is better than that of the present fractal transform coding methods, especially in compression of signals with sudden changes Conclusion The proposed method is an effective way to achieve better coding quality