Electronics for Imaging Gmbh

Other

U.S. Wireless Corporation

Abraham A Bar

Oliver A Hilsenrath

Mati Wax

Efraim Arazi

Ravi Rajapakse

William F Schreiber

Guy Morag

Emanuel Menczer

Raphael Holtzman

A CDMA receiver for measuring spatial signal information corresponding to several user transmitters comprises a bank of coherent receivers coupled to an antenna array, a bank of signal buffers for recording samples of the received signal data, and a bank of I/Q despreaders for despreading selected signal samples. The receiver also comprises a buffer control circuit for selecting active power control groups in the recorded signal samples for despreading, and a despreader control circuit for selecting PN despreading sequences required to despread the selected power groups. Selected data samples from the signal buffers are fed into the despreaders. The output of the despreaders is a set of spatially correlated I/Q data streams divided into temporal frames, where each frame contains active power control groups from different user transmitters.

Measurement of spatial signature information in CDMA wireless communication systems

A system for easily and inexpensively distributing real time location information of cellular telephone users to various third party information subscribers comprises an HTTP server machine which maintains a dynamic database of current cellular users. The database has a list of caller entries, where each entry typically comprises a user ID number, such as a phone number, mobile ID number, and/or handset serial ID. The entry also includes, for each user ID number, a user location identifier such as a latitude and longitude, a sector number, a caller or called phone number and/or a street address. The HTTP server is connected to the internet so that registered third party information subscribers have access to the database by means of standard HTTP protocols that ensure authentication and provide encryption for security. Using caller ID or other means for obtaining a caller's phone number, the third party subscriber can obtain, via a simple internet query, the current location of the caller by submitting the phone number to the HTTP server using an HTML form. Standard software on the central server machine verifies the authenticity of the subscriber, looks up the location information in the database, and returns the information to the subscriber. The subscriber can then use the location information to provide any of a wide range of services to the caller, or to dispatch emergency vehicles to the location of the caller. In addition, the server can directly provide many location-based services to callers.

Internet distributed real-time wireless location database

A method and apparatus for location finding in a CDMA wireless communication system uses multipath signals in order to accurately determine a transmitter&mdash;s location. Direct path and multipath signals from a mobile transmitter arrive at an array of p antennas belonging to a cellular network base station. A location finding apparatus connected to the base station contains a multichannel receiver that uses PN sequence information provided by the base station receiver to despread the p signals and to separate each of the p signals into temporally distinct multipath parts. A signal processor calculates a signal signature for each active mobile. The signature is comprises a code correlation function, a set of temporal delays corresponding to the multipath parts and a set of signal subspaces. The signature is then compared to a database of calibrated signal signatures and corresponding locations, and a location whose calibrated signature best matches the measured signature is selected as the most likely location of the mobile transmitter. The location information can be used to increase the performance of a cellular telephone network and/or to provide useful services to cellular telephone customers.

Radio transmitter location finding in CDMA wireless communication systems

A method and apparatus for modifying colors in an image displayed on a display device by a computer controlled display system. The method includes selecting at least one color being representative of at least one pixel of the image, where the image includes a plurality of pixels on the display device; determining the colorimetric values for the at least one color; selecting a second color and determining the colorimetric values for the second color; and modifying the colorimetric values of a plurality of pixels in said image such that for any given pixel of the plurality of pixels having colorimetric values being matched to the colorimetric values of the at least one color, then the colorimetric values of the given pixel are modified to match the colorimetric values of the second color. The apparatus of the invention includes a display device; a cursor positioning device; a plurality of smoothed, look-up tables to provide a selection of a region of a color space, which selection is representative of a portion of said image near the at least one color; memory for storing data representative of the region and a second color; and a data processing unit. The method and apparatus allow a selection and automatic modification of a group of colors while maintaining the relationship among the colors so as to appear relatively the same with respect to texture and tonality.

Selective color correction

A method and apparatus for color processing of an image displayed on a display device of a computer controlled display system. The method comprises storing the first image and a second image in a first memory; displaying the first image on the display device; displaying the second image on the display device; storing a first color information for the first image in a second memory; storing a second color information for the second image in a third memory; modifying the display of the first image by storing a third color information into the second memory. An example of an apparatus for performing this method includes a frame buffer for storing the first and second image in a computer controlled display device with a processor for controlling the display device. The apparatus further includes a memory for storing the color information, such as a video look-up table. The invention provides a way for modifying the display of one image displayed on a display device without modifying the other image on a display device and without modifying the data in the frame buffer for either image. The invention further provides a plurality of variants of the first image which may be selected to thereby modify the display of the first image according to the variant which was selected. The invention also provides analog controls which are linked to the variants for modifying the first image.

Animated windows with multi-choice variants and analog controls

The color correction system will enhance an operator's ability to edit and correct the appearance of a color image. This system is particularly useful in desk-top publishing applications. A reference image with an overall desired visual impression is displayed on a screen. This reference image is known to print in an acceptable fashion and give a desired visual impression. When the image to be corrected is modified in order to approximate the visual impression of a reference picture, then the picture to be corrected should print acceptably.

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Palo Alto, CA, United States of America

Abraham A Bar