So the digital image compression technology and the digital image encryption technology have been born and applied in many field, such as multimedia, communication, medicine and so on.

Digital image compression is an important problem both in efficient image storage and transmission.

Aiming at the features of micro unmanned air vehicle and real-time requirement of its digital image compression, the embedded extension 5/3 lifting wavelet improved algorithm is mainly discussed and the hardware structure of 2-D digital image wavelet transform is designed in this paper.

A fixed compression dictionary is created to change the fact that an image has one-to-one compression dictionary and advance the application of the Mandelbrot image in fractal image compression algorithm.

A steady dictionary is constructed to change the fact that an image has only one compression dictionary.

Fractal image compression dictionary is a key factor in the realiation of fractal image compression coding, and the main defect of traditional fractal image compression dictionary coding designed by Barnsley is that the compression dictionary is very small.

Research of dictionary compression scheme based on ARMv4 instruction set;

During the research and analysis of the dictionary compression methods,an improved algorithm based on the combination of dynamic and static circumstances is put forward.