At present,the transform in IFS is limit to affine transform.However,affine IFS is unable to do anything with the anomalous dissection on discretionary quadrangle area.

• 目前迭代函数系统中的变换多限于仿射变换,而仿射迭代函数系统对于区域的任意四边形不规则剖分情形是不能实现的。