Proceedings of SPIE - the International Society for Optical Engineering
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.
Kozaitis, S. P., & Goswami, H. (2001). Adaptive threshold selection technique for denoising in dithered quantizers. Proceedings of SPIE - the International Society for Optical Engineering, 4391, 127-133.