Hughes Aircraft Company

Teledyne Technologies Incorporated

Topaz Systems, Inc.

Teledyne Controls, LLC

David Ray Stevens

Anthony Edward Zank

James F Alves

John F Grabowsky

Gerry R Cacnio

An electronic signature management system includes a graphic tablet digitizer for signaling position coordinates of a stylus being moved to produce a handwritten signature, a clock circuit of the digitizer defining a fixed interval between successive stylus position measurements, a computer processor electrically interfaced with the tablet and programmed for receiving and storing a multiplicity of the coordinates in sequential order as an electronic signature forming a time history of the stylus movement. The computer is also programmed for verifying the fixed time intervals of the measurements, such as by comparing a ratio of total elapsed time and total number of the measurements with a standard measurement interval, and for comparing the electronic signature with a reference signature, such as by feeding a stored reference signature counterpart and the electronic signature into a cross-correlator for evaluating a degree of correspondence between respective time histories of the electronic signature and the reference signature. The signatures can also be compared visually in a simultaneous display wherein respective pointers follow the signatures orthogonally in response to an operator-controlled slider, with pertinent data corresponding to the pointer positions being displayed. The electronic signature is preferably encrypted using a hash function or message digest of the document as a key. Also disclosed are methods for electronically signing a document, wherein the electronic signature is electronically bound to the document, wherein the electronic signature is encrypted using a key derived from the document and not saved, and methods for decrypting and verifying electronic signatures.

Electronic signature management system

An aircraft data transmission system used with an aircraft having a data acquisition unit. The system includes a communications unit located in the aircraft and in communication with the data acquisition unit. The system also includes a cellular infrastructure in communication with the data communications unit after the aircraft has landed. The system further includes a data reception unit in communication with the cellular infrastructure.

Aircraft flight data acquisition and transmission system

A video image processor (100) for processing video images performing the steps of generating video images (103) with a multi-spectral video source (102), converting analog color data contained in the generated video images (103) to digital color data for subsequent signal processing, extracting the digital color data from designated areas of the generated video images and utilizing the extracted digital color data for identifying a color distinguishable from a background color. Thus, the video image processor (100) processes the generated video images and has an intrinsic immunity to the effects of shadows by exploiting multi-spectral color information to distinguish, for example, a passing vehicle from the roadway 116. In a preferred embodiment, the video image processor (100) includes a multi-spectral video source (102) for generating the video images. A color digitizer (104) is employed for converting the analog color data contained in the generated video images to the digital color data for the subsequent signal processing. Then, a digital signal processor (106) is employed to extract the digital color data from the designated areas of the generated video images. Finally, a central processing unit (108) utilizes the extracted digital color data to identify a color distinguishable from the background color.

Video image processor and method for detecting vehicles

Growing community of inventors

Simi Valley, CA, United States of America

David Ray Stevens