Patent ID: 6034741
Filing Date: 2000-03-07
Classification: G06T,H03H

Abstract:
A filter for reducing pulsed noise in an image by using fuzzy logic, the filter comprising:an interface circuit, having an input that receives a plurality of digital signals of the image that are consecutive in time including a digital signal to be processed, and an output that provides an image window having the digital signal to be processed at a center of the image window;a plurality of subtractors, each having a first input that receives the digital signal to be processed, a second input that receives a respective one of the plurality of digital signals, and an output that provides a difference signal that represents a difference between the first input and the second input;a comparator block, having a plurality of inputs each coupled to the output of one of the plurality of subtractors, and an output that provides a result of a comparison performed on the plurality of differences;a memory circuit, coupled to the output of the comparator block, that stores values of a fuzzy logic parameter, an output that provides a selected one of the values of the fuzzy logic parameter based upon the result output from the comparator block;a filtering circuit, having a plurality of inputs that each receives one of a group of the plurality of digital signals, and an output that provides one of the plurality of digital signals based upon an organization of the plurality of digital signals received at the plurality of inputs of the filtering circuit; andan arithmetic block, having a first input coupled to the output of the memory circuit, and a second input that receives the digital signal to be processed, a third input coupled to the output of the filtering circuit, the arithmetic block performing a switch between the digital signal to be processed and the output of the filtering circuit based upon the selected value of the fuzzy logic parameter.