1. A method for producing a globally de-noised cone beam 3D image of an object, the method comprising: (a) taking raw cone beam tomography projection image data from the object: (b) applying a wavelet domain denoising technique to the image data; (c) applying at lease one other denoising technique to the image data; and (d) reconstructing the final image from the denoised projection image data to achieve global denoising.