Patents by Inventor Rajarshi Ray

Rajarshi Ray has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20080039058
    Abstract: Methods, devices, computer program products, processors and wireless networks are presented that provide for temporary storage of media content on a wireless communication device. According to aspects, when a wireless communication device requests media content from a media content service but is unable to receive the media due to insufficient memory availability, insufficient wireless network signal strength or another delivery attribute, the media content service automatically re-directs delivery of the content to the associated temporary storage wireless communication device. In turn, the wireless device that requested the media content is able to automatically retrieve the media content from the temporary storage device when memory capacity or network signal strength is deemed sufficient to provide for storage or reception.
    Type: Application
    Filed: January 25, 2007
    Publication date: February 14, 2008
    Applicant: QUALCOMM INCORPORATED
    Inventor: Rajarshi Ray
  • Patent number: 6751473
    Abstract: A portable wireless communication terminal includes electronics for receiving and transmitting both video and audio signals. The electronics are housed in rugged, drop-tolerant consoles, which are interconnected so that they may be extended and reconfigured relative to each other for convenient use and easy, compact storage. A camera lens is included in a camera console, a video display is included in a video display console, and alphanumerical keys are included in a base console. The camera console can be rotated relative to the video display console so that the user can transmit a video signal of the surroundings while watching the video display. Further, the video display console can be extended and tilted relative to the base console.
    Type: Grant
    Filed: February 26, 1999
    Date of Patent: June 15, 2004
    Assignee: Lucent Technologies Inc.
    Inventors: Suresh Goyal, Rajarshi Ray
  • Patent number: 6192257
    Abstract: A wireless communication terminal is configured for enabling a user to receive and transmit video images as well as receive and transmit audio or speech signals associated with the user of the terminal and another user at, for example, a remote location. The received video image is obtained from a video image signal received over a radio frequency communications link established between the wireless communication terminal and a cellular base station. This received video image is displayed in a video image display conveniently associated with the wireless communication terminal. The transmitted video image signal may be that of the user of the terminal, of a scene within the field of view of the video camera or of text either coupled to the terminal through one of many well known data interfaces, or an image of text as captured by the camera.
    Type: Grant
    Filed: March 31, 1998
    Date of Patent: February 20, 2001
    Assignee: Lucent Technologies Inc.
    Inventor: Rajarshi Ray
  • Patent number: 5596658
    Abstract: Compression of a plurality of signal samples y(t.sub.0),y(t.sub.1),y(t.sub.2) . . . y(t.sub.z) may be accomplished by performing a first linear regression to obtain a curve fitted thereto which is represented by a polynomial having a first set of coefficients (a.sub.0,a.sub.1,a.sub.2,a.sub.3 . . . a.sub.n) which is stored in memory (18) or transmitted by a transmitter (20). The error between each of the actual signal samples (y(t.sub.0),y(t.sub.1),y(t.sub.2) . . . y(t.sub.z) and the value approximated by the curve fitted to the values is computed and then thresholded. A second regression analysis is then performed to fit a curve, having a second set of coefficients (b.sub.0,b.sub.1,b.sub.2,b.sub.3 . . . b.sub.q) to the thresholded error values. The second set of coefficients is also stored or transmitted and used, in conjunction with the first set of coefficients, to closely approximate the original set of signal samples.
    Type: Grant
    Filed: June 1, 1993
    Date of Patent: January 21, 1997
    Assignee: Lucent Technologies Inc.
    Inventors: Robert B. Levy, Rajarshi Ray
  • Patent number: 5407488
    Abstract: In-situ removal of material, such as solder paste (12), from openings (26--26) in a stencil (22) is accomplished by imparting a vibrational motion to the stencil. In practice, the stencil (22) may be vibrated by one or more DC solenoids (28--28), each having its plunger (28) in contact with the periphery of the stencil and each excited with AC so that the solenoid plunger undergoes a linear oscillation to vibrate the stencil.
    Type: Grant
    Filed: October 12, 1993
    Date of Patent: April 18, 1995
    Assignee: AT&T Corp.
    Inventor: Rajarshi Ray
  • Patent number: 5311598
    Abstract: Detection of a defect (18) on the surface (15) of an article (10), such as a semiconductor chip, is accomplished by illuminating the chip in a bright field and then capturing the image thereof with a television camera (30) coupled to a machine vision processor (32). To detect the defect (18), the vision processor first adaptively thresholds the captured image to effectively eliminate areas in the image brighter than those associated with the defect (18) which are usually dark. Thereafter, the vision processor (32) erodes and then dilates the dark areas within the image remaining after binarization to isolate those dark areas associated with the defect. The existence of a defect can then be established by the existence of a now-isolated dark area.
    Type: Grant
    Filed: June 13, 1990
    Date of Patent: May 10, 1994
    Assignee: AT&T Bell Laboratories
    Inventors: Chinmoy B. Bose, Rajarshi Ray
  • Patent number: 5267063
    Abstract: The contrast of an LCD cell (12) is enhanced by the use of a gradient index plate mirror (16',16") positioned behind the cell to reflect light from a light source (14',14") through the cell in a well-collimated beam. The mirror (16',16") is formed of an optical plate (34',34") having first and second major surfaces (36',36") and (38',38"), the latter having a reflective coating (40',40") thereon. The optical plate (34',34") has a gradient index of refraction which increases from its first to its second major surface. As a consequence, the light entering the plate and reflected back therethrough is refracted so as to be bent closer to the plate normal (42',42"), causing the light leaving the mirror and entering the LCD cell to be well collimated, which is desirable for improving the display contrast.
    Type: Grant
    Filed: July 2, 1992
    Date of Patent: November 30, 1993
    Assignee: AT&T Bell Laboratories
    Inventor: Rajarshi Ray
  • Patent number: 5172420
    Abstract: Inspection of a metallized pattern (14) on a substrate (12) to monitor both the lateral dimensions and the intensity variation beyond tolerance limits is carried out by first capturing the image of the pattern with a television camera (20). The captured image is then compared to each of two models (40 and 42) comprising comparison patterns whose features have their lateral dimensions eroded and dilated, respectively, and the other aspect dilated and eroded, respectively, by a factor corresponding to the dimensional and intensity tolerances. The results of such comparison are logically combined to yield an image containing only defects (if any).
    Type: Grant
    Filed: May 11, 1992
    Date of Patent: December 15, 1992
    Assignee: AT&T Bell Laboratories
    Inventors: Rajarshi Ray, David R. Riese
  • Patent number: 5136428
    Abstract: Distortion of the image displayed by a cathode ray tube display (10,10') can be compensated by placing a flat-plate optical device, fabricated from two plates (14,14') of optical material joined at their edges an an angle, in the field of view of the display. Each of the plates (14,14') is advantageously constructed so as to have a gradient index of refraction such that the index of the plate changes across its length from its free edge to the vertex (16) formed with the other plate. By fabricating each of the plates (14 and 14') such that the index of refraction of each decreases or increases from the free edge of each plate to the vertex formed with the other plate, the device formed by the plates will compensate for either barrel or pincushion distortion, respectively.
    Type: Grant
    Filed: June 3, 1991
    Date of Patent: August 4, 1992
    Assignee: AT&T Bell Laboratories
    Inventor: Rajarshi Ray
  • Patent number: 5058178
    Abstract: Defective or missing solder bumps (18) on a surface (13) of an article (10) such as a chip carrier are detected by first illuminating the surface with dark field illumination. Next, the image of the surface of the article is captured, typically by a television camera (30). The captured image is processed to detect defects by first creating a window (57) in the image about each group of solder bumps and then creating a bounding box (58) about each bump in each window. Each of a set of attributes, including: the number, size and location of the windows, the size location and number of boxes in each window, and the dimensions, shape and brightness of the image in each box, is measured. The value of each attribute is compared to a reference value, representing the value of the attribute when no defects are present. If the attribute differs by more than a predetermined tolerance for its reference value, than a particular defect is prevent.
    Type: Grant
    Filed: December 21, 1989
    Date of Patent: October 15, 1991
    Assignee: AT&T Bell Laboratories
    Inventor: Rajarshi Ray
  • Patent number: 5023917
    Abstract: Accurate inspection of a pattern (14) of metallized areas (12) printed on a substrate (10) is accomplished by compensating the pattern for any deformation prior to comparing the image thereof to that of a perfect (master) pattern (14'). The amount of compensation is determined by first capturing the image of selected elements in the pattern with the aid of a television camera (32). A machine vision processor (36) processes the output of the camera (32) to determine the offset of each of the selected elements in the pattern from the corresponding elements within a master pattern (14') which represents a perfectly formed version of the actual pattern (14). From the amount of offset between the selected elements in the pattern (14) and the corresponding elements in the master pattern (14'), the amount of pattern deformation at the preselected elements, as well as at all intermediate sites, is determined and the pattern is compensated accordingly.
    Type: Grant
    Filed: August 15, 1988
    Date of Patent: June 11, 1991
    Assignee: AT&T Bell Laboratories
    Inventors: Chinmoy B. Bose, Rajarshi Ray
  • Patent number: 4975972
    Abstract: Detection of a defect (18) on the surface (15) of an article (10), such as a semiconductor chip, is accomplished by illuminating the chip in a bright field and then capturing the image thereof with a television camera (30) coupled to a machine vision processor (32). To detect the defect 18, the vision processor first adaptively thresholds the captured image to effectively eliminate areas in the image brighter than those associated with the defect (18) which are usually dark. Thereafter, the vision processor (32) erodes and then dilates the dark areas within the image remaining after binarization to isolate those dark areas associated with the defect. The existence of a defect can then be established by the existence of a now-isolated dark area.
    Type: Grant
    Filed: October 18, 1988
    Date of Patent: December 4, 1990
    Assignee: AT&T Bell Laboratories
    Inventors: Chinmoy B. Bose, Rajarshi Ray
  • Patent number: 4688939
    Abstract: Automated inspection of solder bumps (18--18) on a major surface (14) of a chip carrier (10) is accomplished by placing the chip carrier on a platform (22) beneath a ring light (28) which is in registration with a television camera (30). Light from the ring light, which is directed at an angle towards all sides (12--12) of the chip carrier, is only reflected upwardly into the television camera by the solder bumps. The output signal of the television camera, which varies with the intensity of the light reflected from the solder bumps, is processed by a vision system (32) to obtain a one-dimensional plot of the light intensity. The one-dimensional intensity plot is analyzed automatically by the vision system to detect for missing, bridged or excessive solder bumps on the chip carrier.
    Type: Grant
    Filed: December 27, 1985
    Date of Patent: August 25, 1987
    Assignee: AT&T Technologies, Inc.
    Inventor: Rajarshi Ray
  • Patent number: 4613269
    Abstract: A robotic apparatus and method of acquiring jumbled objects or workpieces from a bin, and transferring them to a final site, or to an intermediate site for quality inspection. A video camera system produces a video signal representing a brightness image of the jumbled objects. An intermediate amplitude range of the video signal is selected, expanded, stored, and quantized into digital pixels. A computer enhances the image using histogram techniques, performs edge suppression, performs repeated shrinking with progressively-increased pixel thresholds until an area limit is reached, performs clustering of closely-spaced pixels, and commands movement of the robot gripper to a computed grip site on a recognized object. The gripper may limit its gripping pressure as a function of the deformation of the object gripped.
    Type: Grant
    Filed: February 28, 1984
    Date of Patent: September 23, 1986
    Assignee: Object Recognition Systems, Inc.
    Inventors: Joseph Wilder, Rajarshi Ray