Utilizing the echoic intension and distribution of different organizations and local details

ultrasonic image catches the important medical pathological changes.However ultrasonic image may be contaminated by the speckle noise in its forming process

which degrades image quality specially concealing some details

and works disadvantages to image segmentation

character extraction and image recognition

disease diagnosis and quantitative analysis.Using local coordinate transform

the first and second order normal derivatives of edge and local detail and the hyperbolic tangent function

also combining the anisotropic diffusion equation

we have put forth an ultrasonic image denoising and edge enhancement scheme

which can preserve edges

local details and ultrasonic echoic bright strips on denoising.This has been indicated theoretically and experimentally.