Encryption and Compression Scheme of Color Image Based on a Hyperchaotic System

In order to encrypt and compress a color image simultaneously, an encryption and compression algorithm for color image was proposed based on a hyperchaotic system. A hyperchaotic system was utilized to make a pure white image into a uniform distribution and colorful palette. In compression process, indexing technology was utilized to map the 3D data of color image to two-dimensional subscript of palette. The compressed image would continue to be encrypted by loop feedback in physical space and time space. Simulation experiments show that the algorithm is realized to encrypt and compress a color image simultaneously. It has large key space, high security, and big compression ratio as well as great application value in secure communication of color image.