1. An encoding method comprising the steps of: detecting a structure information from an input image data; linking the structure information; profiling the structure information; prioritizing the structure information; modeling the structure information using a discrete cosine transform (DCT) coupled with an inter-chain differential pulse code modulation(DPCM); and encoding the structure information including a geometric average as to which edge chains to encode; wherein both edge geometry and intensity parameters are reorganized into at least two sequences; wherein structure information including a set of edge chains is used for encoding.