Robert D Harvey

US Patent:

53135326, May 17, 1994

Filed:

Oct 28, 1991

Appl. No.:

7/784634

Inventors:

Robert L. Harvey - Lexington MA
Paul N. DiCaprio - Belmont MA
Karl G. Heinemann - Cambridge MA

Assignee:

Massachusetts Institute of Technology - Cambridge MA

International Classification:

G06K 962

US Classification:

382 15

Abstract:

A pattern (e. g. , the normal or abnormal characteristics of a biological cell) within an image is recognized based on visual characteristics of the pattern, the image being represented by signals whose values correspond to the visual characteristics, using a location channel which determines the location of the pattern within the image based on the signal values, and a classification channel which categorizes the pattern based on the signal values, the location channel and the classification channel operating in parallel and cooperatively to recognize the pattern. In other aspects, there the orientations of edges of the pattern within subwindows of the image are analyzed as are the strengths of edges of the pattern near the periphery of portions of the image; an unsupervised classifier defines internal representation classes of objects, and a supervised classifier maps the classes to user-specified categories; and there is a feedback path from the classification channel to the location channel to cause the location channel to adapt to classification results generated by the classification channel.

US Patent:

52492591, Sep 28, 1993

Filed:

May 28, 1992

Appl. No.:

7/892401

Inventors:

Robert L. Harvey - Lexington MA

Assignee:

Massachusetts Institute of Technology - Cambridge MA

International Classification:

G06F 1518

US Classification:

395 13

Abstract:

A generic algorithm search is applied to determine an optimum set of values (e. g. , interconnection weights in a neural network), each value being associated with a pair of elements drawn from a universe of N elements, N an integer greater than zero, where the utility of any possible set of said values may be measured. An initial possible set of values is assembled, the values being organized in a matrix whose rows and columns correspond to the elements. A genetic algorithm operator is applied to generate successor matrices from said matrix. Matrix computations are performed on the successor matrices to generate measures of the relative utilities of the successor matrices. A surviving matrix is selected from the successor matrices on the basis of the metrics. The steps are repeated until the metric of the surviving matrix is satisfactory.

US Patent:

55439390, Aug 6, 1996

Filed:

Sep 2, 1994

Appl. No.:

8/300587

Inventors:

Robert L. Harvey - Lexington MA
David J. Cipolle - Newton NH

Assignee:

Massachusetts Institute of Technology - Cambridge MA

International Classification:

H04N 141
H04N 140
H04N 712
H04N 1102

US Classification:

358426

Abstract:

Differential image data compression systems and techniques are disclosed for use in video telephone systems for full duplex, real time transmission of audio and video images over nominal 3 kHz residential telephone lines and other narrow bandwidth channels. Each video telephone device consists of a transmitting portion and a receiving portion. In the transmitting section a reduced grey-scale (luminance) image, preferably consisting of only black-and-white pixels, is compared in an image processing module with a similarly reduced image derived from previous values to determine pixel positions that have changed. Information representative of the changes is then encoded and modulated and (time or frequency) multiplexed with the audio and/or chrominance signals for transmission. At the receiver, the incoming signal is demodulated and demultiplexed to separate the audio and video portions, the image portion is decoded and the luminance value is updated by an image updating unit. Adaptive resolution, pixel averaging and interpolation techniques are also disclosed for picture enhancement.