3D Wavelet Subbands Mixing for Image Denoising

Table 1

Comparison of different implementations of NL-means in terms of computational time and denoising quality. The computational time was obtained with multithreading on a DualCore Intel(R) Pentium(R) D CPU 3.40 GHz. These results were obtained on a T1-w phantom image of 181×217×181 voxels with 9% of noise.

	Computational time (s)	PSNR (dB)
NLM	4208	32.59
Blockwise NLM	734	31.73
Optimized NLM	778	34.44
Optimized blockwise NLM	135	33.75
Optimized blockwise NLM with WM	181	34.47