Hierarchical neural networks for edge preservation and restoration

Si Wei Lu; Anthony Szeto

doi:10.1117/12.135116

Abstract

In the paper, a hierarchical neural network system is designed to adjust edge measurements based on the information provided by neighboring edges. The local edge pattern is analyzed to determine and reinforce edge structures while suppressing unwanted noise and false edges. The neural network is made up of four levels of subnets. The subnet in the first level determines the potential adjustment on the element of interest by detecting edge contours according to the selected processes in the neural nets and the input local edge pattern. The second level consists of a cooperative-competitive neural net model to find the orientation of the strongest edge contour in the local edge pattern. The subnet in the third level ascertains the conditions for adjusting the gradient magnitude and determines the amount of adjustment to the gradient magnitude, and calculates the new adjusted gradient magnitude and determines if the element of interest is to be an edge element or a non-edge element. The subnet in level four is a semilinear feedforward net which is used to assign the new orientation for the element of interest. An iterative approach incorporated into the neural network system has also enabled the application of global analysis in the process of adjusting the edge measurements.

Citation Download Citation

Si Wei Lu, Anthony Szeto, "Hierarchical neural networks for edge preservation and restoration", Proc. SPIE 1608, Intelligent Robots and Computer Vision X: Neural, Biological, and 3-D Methods, (1 March 1992); doi: 10.1117/12.135116; https://doi.org/10.1117/12.135116

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