Adaptive Threshold Selection Technique for Denoising in Dithered Quantizers

We described an adaptive denoising method to improve image quality in a wavelet-based image compression process that uses dithered quantization, In our method, the second-order moment of the quantization noise is made independent of the signal by random quantization. Then, the quantization noise is reduced by thresholding wavelet coefficients. We first obtained a fixed threshold using any known technique. Then, a neighborhood is searched for the optimal threshold to optimize some cost function.