Adaptive threshold selection technique for denoising in dithered quantizers
Samuel P. Kozaitis, Hemen Goswami · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2001
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.