Image processing

Clear Eddy Current Flaw Image Using Computerized Tomography Inversion Technique

“…This process can be expressed by a linear system as shown in Figure 2. If an input image d(x,y) is applied to a linear system with point spread function p(x,y), the resultant degraded output image b(x,y) is given by the following convolution [9].…”

“…Signals given by Equations (7) and (8) (9) where K is constant. The resultant signal contains the information on the flaw depth D(x,y) and is obtained by the line integrals along the lines perpendicular to the scanning directions of the tangential coil which is analogous to Radon transform given by Equation (6).…”

“…The resultant signal contains the information on the flaw depth D(x,y) and is obtained by the line integrals along the lines perpendicular to the scanning directions of the tangential coil which is analogous to Radon transform given by Equation (6). Thus the authors have thought that Cf inversion technique can be applied to ECf signals transformed by Equation (9) in order to obtain clear ECf flaw images.…”

Accuracy and space bandwidth in space variant optical correlators

“…Space variant optical processing techniques have been investigated for several years [1][2][3] but only recently have they been applied to pattern recognition systems [4]. A general formulation of space variant correlation using coordinate transformations to produce optical pattern recognition systems invariant to specific input deformations has recently been described [5].…”

A two-dimensional digital filter chip set for modular two-dimensional filter implementation

“…In the case of multi-dimensional filters the same procedure is not possible because of the "Fundamental Curse" of multi-dimensional rational functions [1]. which may be rewritten as…”