John W Fields

US Patent:

6476545, Nov 5, 2002

Filed:

Apr 28, 2000

Appl. No.:

09/561536

Inventors:

Joseph Michael Carpinelli - Lawrenceville NJ
Dennis John Bechis - Yardley PA
George Herbert Needham Riddle - Princeton NJ
David Arthur New - Mercerville NJ
John Richard Fields - Princeton Junction NJ

Assignee:

Sarnoff Corporation - Princeton NJ

International Classification:

H01J 2972

US Classification:

313433, 313427, 313432, 313439

Abstract:

A cathode ray tube includes an electron gun directing electrons away from a faceplate having an electrode biased at screen potential. A plurality of electrodes located on or near the rear wall of the tube envelope are biased at graduated potentials so that the electron beam is deflected by the electrostatic field produced thereby to impinge upon the faceplate. The electron beam is magnetically deflected over a relatively small angle as it exits the electron gun to scan across the faceplate to impinge upon phosphors thereon to produce light depicting an image or information. The electrodes may be biased at or below screen potential, with the electrode closest the electron gun typically biased at a negative or ground potential and the electrode closest the faceplate (i. e. distal the electron gun) typically biased below screen potential to direct electrons towards the faceplate, thereby to increase the landing angle thereof.

US Patent:

6670745, Dec 30, 2003

Filed:

Mar 22, 2002

Appl. No.:

10/104752

Inventors:

Joseph Michael Carpinelli - Lawrenceville NJ
Michael Denton Grote - Hamilton NJ
John Richard Fields - Princeton Junction NJ

Assignee:

Sarnoff Corporation - Princeton NJ
Orion Electric Company, LTD - Kyung-Bukm

International Classification:

H01J 2970

US Classification:

313440, 335210, 335213

Abstract:

A cathode ray tube deflection yoke is provided wherein the deflection yoke includes a plurality of deflection coils. One or more of the deflection coils have a non-constant distribution of turns, whereby an electron beam passing through the deflection yoke is deflected by a magnetic field that varies according to different numbers of turns relative to position of electrons of the electron beam between the entrance and exit of the deflection yoke. The non-constant turns distribution may be linear or non-linear, may be monotonic or non-monotonic, and/or may have a positive or negative turns bias, either in whole or in part. The horizontal deflection coil and/or the vertical deflection coil, or both, may have a non-constant turns distribution.

US Patent:

8059887, Nov 15, 2011

Filed:

Sep 25, 2007

Appl. No.:

11/860650

Inventors:

John Richard Fields - Princeton Junction NJ, US
James Russell Bergen - Hopewell NJ, US
Garbis Salgian - Princeton NJ, US

Assignee:

SRI International - Menlo Park CA

International Classification:

G06K 9/00

US Classification:

382154, 382112, 382141, 382144, 382145

Abstract:

The present invention provides an improved system and method for estimating range of the objects in the images from various distances. The method comprises receiving a set of images of the scene having multiple objects from at least one camera in motion. Due to the motion of the camera, each of the images are obtained at different camera locations Then an object visible in multiple images is selected. Data related to approximate camera positions and orientations and the images of the visible object are used to estimate the location of the object relative to a reference coordinate system. Based on the computed data, a projected location of the visible object is computed and the orientation angle of the camera for each image is refined. Additionally, pairs of cameras with various locations can then be chosen to obtain dense stereo for regions of the image at various ranges. The process is further structured so that as new images arrive, they are incorporated into the pose adjustment so that the dense stereo results can be updated.

US Patent:

8305430, Nov 6, 2012

Filed:

Sep 18, 2006

Appl. No.:

11/532897

Inventors:

Taragay Oskiper - East Windsor NJ, US
John Fields - Princeton Junction NJ, US
Rakesh Kumar - West Windsor NJ, US

Assignee:

SRI International - Menlo Park CA

International Classification:

H04N 13/00

US Classification:

348 47, 348 48

Abstract:

A visual odometry system and method for a fixed or known calibration of an arbitrary number of cameras in monocular configuration is provided. Images collected from each of the cameras in this distributed aperture system have negligible or absolutely no overlap. The relative pose and configuration of the cameras with respect to each other are assumed to be known and provide a means for determining the three-dimensional poses of all the cameras constrained in any given single camera pose. The cameras may be arranged in different configurations for different applications and are made suitable for mounting on a vehicle or person undergoing general motion. A complete parallel architecture is provided in conjunction with the implementation of the visual odometry method, so that real-time processing can be achieved on a multi-CPU system.

US Patent:

8428344, Apr 23, 2013

Filed:

Sep 23, 2011

Appl. No.:

13/242533

Inventors:

John Richard Fields - Princeton NJ, US
James Russell Bergen - Princeton NJ, US
Garbis Salgian - Princeton NJ, US

Assignee:

SRI International - Menlo Park CA

International Classification:

G06K 9/00

US Classification:

382154, 382294, 382209, 382112, 382141

Abstract:

The present invention provides an improved method for estimating range of objects in images from various distances comprising receiving a set of images of the scene having multiple objects from at least one camera in motion. Due to the motion of the camera, each of the images are obtained at different camera locations. Then an object visible in multiple images is selected. Data related to approximate camera positions and orientations and the images of the visible object are used to estimate the location of the object relative to a reference coordinate system. Based on the computed data, a projected location of the visible object is computed and the orientation angle of the camera for each image is refined. Additionally, pairs of cameras with various locations can obtain dense stereo for regions of the image at various ranges.

US Patent:

42635292, Apr 21, 1981

Filed:

Oct 22, 1979

Appl. No.:

6/087451

Inventors:

Wieslaw W. Siekanowicz - Lawrenceville NJ
John R. Fields - Cranbury NJ

Assignee:

RCA Corp. - New York NY

International Classification:

H01J 2946
H01J 2948

US Classification:

313422

Abstract:

An evacuated envelope is divided into a plurality of electron propagation channels. Each channel includes an electron gun section and a beam guide section. The electron gun section provides electrons in the form of beams to the guide section. The guide section includes spaced guide meshes and the electrons are propagated along the channel in the space between the guide meshes. A launch section, in the form of at least one pair of launch electrodes, is arranged between the electron gun section and the beam guide section. The conditions under which electrons leave the gun section and enter the guide section are selected by the application of selected voltages to the launch electrodes.

US Patent:

20050015201, Jan 20, 2005

Filed:

Jul 16, 2003

Appl. No.:

10/621239

Inventors:

John Fields - Princeton Jct. NJ, US
John Southall - Philadelphia PA, US

International Classification:

G08G001/16

US Classification:

701301000, 340903000, 340436000

Abstract:

A method and apparatus for detecting obstacles in off-road applications. A stereo camera and specific image-processing techniques enable a vehicle's vision system to identify drivable terrain in front of the vehicle. The method uses non-drivable residuals (NDR), where the NDR is zero for all terrain that can be easily traversed by the vehicle and greater than zero for terrain that may not be traversable by the vehicle. The method utilizes a depth map having a point cloud that represents the depth to objects within the field of view of the stereo cameras. The depth map is tiled such that the point cloud data is represented by an average (smoothed) value. The method scans pixels in the smoothed depth map to find sequences of “good” points that are connected by line segments having an acceptable slope. Points that lie outside of the acceptable slope range will have an NDR that is greater than zero. The vehicle control system can use the NDRs to accurately make decisions as to the trajectory of the vehicle.