
Accession Number : ADD013185
Title : Analog Gaussian Convolver.
Descriptive Note : Patent, Filed 23 Apr 82, patented 18 Sep 84,
Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC
Personal Author(s) : Larson,Noble G
Report Date : 18 Sep 1984
Pagination or Media Count : 5
Abstract : An analog Gaussian convolver for performing high speed convolutions of arbitrary functions (e.g., image arrays) with or operators which uses two units of 2dimensional Gaussians G(u,v) and the like. The output of the two units are subtracted to obtain difference of Gaussian operators (DOG), a very important parameter in computer vision. Input data in the form of a 2dimensional digital array representing image pixels from the image array is converted into analog form and is then convolved with a 1dimensional Gaussian operator in a first direction and the result is clocked into a tapped analog delay line. The outputs of the analog tapped delay line are also convolved with another (normally identical) 1dimensional Gaussian operator in a direction normal to the first direction. The results so obtained represents the convolution of the image with a 2dimensional Gaussian operator in a channel. By duplicating the two 1dimensional convolvers and driving a second channel with the same rastering window, the image can be simultaneously convolved with another Gaussian operator and obtaining convolution with a DOG which is useful in a computer vision system for edge detection and binocular stereo.
Descriptors : *PATENTS, *ANALOG SYSTEMS, *INVERTER CIRCUITS, GAUSSIAN QUADRATURE, CONVOLUTION, IMAGE PROCESSING, VISION
Subject Categories : Electrical and Electronic Equipment
Distribution Statement : APPROVED FOR PUBLIC RELEASE