SPIHT-based joint image compression and encryption
- 1. College of Computer Science and Engineering, Chongqing University, Chongqing 400044, China;
- 2. Dept of Electronic Engineering, City University of Hong Kong, 83 Tat Chee Avenue, Kowloon Tong, Hong Kong, China;
- 3. Centre of Network Management, Chongqing Education of College, Chongqing 400067, China
- Received Date:
- Accepted Date:
- Available Online:
Project supported by the Research Grants Council of the Hong Kong Government, China (Grant No. CityU 122308), the Natural Science Foundation Project of CQ CSTC (Grant No. CSTC, 2010BB2279), the Applying Basic Research Program of Chongqing Education Committee (Grant Nos. kj091501, kj091502, kj101501), and the China Postdoctoral Science Foundation (Grant No. 2011M501391).
Abstract: A joint of image encryption and compression is investigated, and a novel joint encryption and compression scheme is proposed. In our scheme, the encryption process is performed before compression. Making use of the properties of discrete wavelet transform (DWT) and Set Partitioning in Hierarchical Trees (SPIHT) coding, confusion is restricted to the interior of single subband image itself and so image details are retained. Furthermore, diffusion preserves the two most significant bits (MSBs) and the sign bit, which contain important information about the image. The experiments show that the proposed algorithm possesses a good visual quality of the reconstructed image and a high encryption speed.