Hide Research, Based On Vector Quantization And Wavelet Image

Images are widely used in our daily lives along with the development on network and communication technology. However, the more extensively we use images, the more important their security becomes. Thus, image security has become an important issue in the current computer world.We present an image-hiding cryptosystem based on vector quantization and wavelet transform. The key information of secret image is encrypted and then hidden into another image, which can be publicly accessed. In the paper, we compress the key image information using vector quantization, and apply wavelet transform method in compressing and noise-removing to improve the image quality. The experiment shows that the cryptosystem can provide enough image quality. Also, the DES algorithm encrypts the key information of secret image, even if illegal users steal it, it's difficult for them to decrypt the key information. Therefore, it's a much safer and more practical cryptosystem than tradition ones.