GPU-Based Block-Wise Nonlocal Means Denoising for 3D Ultrasound Images

Algorithm 1

For each similar window within the searching window, except the fiducial window

  For each voxel of the similar window

   Calculate the distance for similarity;

  End for

Calculate the similarity weight;

  Cumulate the weight and weighted gray-scales, save the maximal similarity weight;

End for

Cumulate the weight and weighted gray-scales on fiducial patch of search window;

Normalize the cumulative sum of the weighted gray-scales, and obtain the new gray-scale;