In order to improve the ratio of binary image compression, using top-dowm method of coding, bring forward a fractal image compression method based on isosceles right triangle, and simulated.

• 摘要为了提高二值图像的压缩比，采用自顶向下的编码方法，提出一种基于等腰直角三角形的分形图像压缩算法，并进行仿真实验。