摘要
传统的四叉树分形图像编码方法不考虑图像内容,将其划分成规则的正方形块处理,存在当分块较大时会影响恢复图像的视觉效果,降低信噪比,而当分块较小时又会降低压缩比,增加编码时间的矛盾。本文在传统四叉树分割方法的基础上提出了一种新的改进方法,该方法根据图像内容的不同将其划分成多种矩形块进行处理,从而解决了上述矛盾,使图像在恢复质量不变的情况下,压缩比有了明显提高。
The traditional quadtree method for fractal image coding does not consider the contents of an image block but separate directly it into regular square blocks.Therefore, there is a contradiction that the bigger blocks affect the effect of reconstructed image, the smaller blocks decrease compression ratio and increase computation time.In this paper, an advanced quadtree method for fractal image coding is presented, the method can tackle above-mentioned contradiction and obtain higher compression ratio while the quality of reconstructed image is the same.
出处
《华东船舶工业学院学报》
2004年第4期71-75,共5页
Journal of East China Shipbuilding Institute(Natural Science Edition)
关键词
图像压缩
图像编码
分形
四叉树
image compression
image coding
fractal
quadtree
