... a zone of transition.The Laplacian operator [4] is a second-order derivativeoperator and is used to detect boundary at locations of thezero crossing. The Canny operator [5, 6], another gradientoperator, ... and zero otherwise. Once theparameters Ti, jk,l and Ii, jare obtained using (14), eachneuron can evaluate and adjust its state according to (10 )and (12).Figure 6: Original wood image.Once ... thickness of the body and energy of the X-ray. For a monochromatic narrow beam X-ray (w hichI0X-rayTIFigure 1: Attenuation diagram of X-ray imaging law.has a single wavelength), when it penetrates...