Re-quantization Codebook Using Fingerprint

Re-quantization is a key technology for reducing the bit rate of compressed data. The reduction of the bit rate and in certain cases may result in signal quality degradation. Techniques need to be deployed to enhance the signal quality based on optimization techniques. The proposed scheme constructed an optimal re-quantization codebook in an iterative manner for a given original quantization codebook that was constructed based on the quantization codebook of the transmitter. The construction process was iteratively repeated until a local optimum solution is reached. Algorithm implemented in fingerprint compression means using VQ codebook that had been computed from several previous training images. Better quality and low PSNR values were attained with this methodology compared with those using VQ codebook of several training images.