Hollow calcium carbonate(CaCO3) microspheres were prepared in aqueous solution with the presence of polyoxyethylene(20) sorbitan monolaurate(Tween20) and sodium
Associated with ITU-T G.719,a post-processing method in frequency domain for enhancing the perceptual quality of the decoded transient audio is proposed only to
Gradient vector flow(GVF) is an effective external force for active contours,but its isotropic nature handicaps its performance.The recently proposed gradient vector flow in the normal direction(NGVF)