公开(公告)号：AT168808T

公开(公告)日：1998-08-15

申请号：AT93480167

申请日：1993-10-19

Applicant: IBM

Inventor： BRAUDAWAY GORDON WESLEY ,  DELP HELEN ROXLO

IPC: G06T1/00 ,  G06T11/00 ,  G09G5/00 ,  G09G5/06

Abstract: Faithful color images are created in an efficient manner for display on a specific computer display. A standard computer system generates a palette calibration table, based on information about a standard display. The standard computer system then creates a device independent image from the palette calibration table and from an original image. The palette calibration table and device independent image are then transmitted to a specific computer system. The specific computer system receives the palette calibration table and device independent image from the standard computer system. It calculates a display specific palette from the palette calibration table and from information about the specific display. The specific computer system then generates the faithful color image for display by sending the device independent image and the display specific palette to the display adapter in the specific computer system.

公开(公告)号：DE69727440T2

公开(公告)日：2004-12-30

申请号：DE69727440

申请日：1997-10-15

Applicant: IBM

Inventor： BRAUDAWAY GORDON WESLEY ,  MINTZER FREDERICK COLE

IPC: H04N1/38 ,  G06T1/00 ,  G09C5/00 ,  H04N1/32 ,  H04N1/387 ,  H04N7/08 ,  H04N7/081 ,  G06T11/00

公开(公告)号：GB2358115A

公开(公告)日：2001-07-11

申请号：GB0022614

申请日：2000-09-15

Applicant: IBM

Inventor： BRAUDAWAY GORDON WESLEY ,  HOWARD PATRICK D ,  KAMESAM PASUMARTI VENKATA ,  MINTZER FREDERICK COLE ,  SACHAR HOWARD EDWARD ,  SMITH SEAN WILLIAM ,  SOCOLOFSKY JOHN MARK ,  TRESSER CHARLES PHILIPPE LOUIS ,  WU CHAI WAH

IPC: G03G21/04 ,  G07F17/26 ,  H04N1/32 ,  H04N1/44 ,  H04L9/30

Abstract: A communication link is provided between a certified document owner and a remote printing station. The printing station is provided with a leaf of special paper and determines whether the leaf is legitimate by comparing a representative number and its encrypted version (encrypted using a first key) at locations on the leaf Extra hidden data may also be provided on the leaf for checking its authenticity. The printing station transmits the representative number and its encrypted version to the certified document owner who can also perform the authenticity check. The certified document owner appends a document with the representative number, computes a digitally signed version of the appended document (using a second key) and transmits the document and the signed version to the printing station for printing. As such, further unauthorised prints of this document as well as copies of this document can be recognized as non-authentic. The printer used does not need to be specialised with security controls.

公开(公告)号：DE69319848D1

公开(公告)日：1998-08-27

申请号：DE69319848

申请日：1993-10-19

Applicant: IBM

Inventor： BRAUDAWAY GORDON WESLEY ,  DELP HELEN ROXLO

IPC: G06T1/00 ,  G06T11/00 ,  G09G5/00 ,  G09G5/06

Abstract: Faithful color images are created in an efficient manner for display on a specific computer display. A standard computer system generates a palette calibration table, based on information about a standard display. The standard computer system then creates a device independent image from the palette calibration table and from an original image. The palette calibration table and device independent image are then transmitted to a specific computer system. The specific computer system receives the palette calibration table and device independent image from the standard computer system. It calculates a display specific palette from the palette calibration table and from information about the specific display. The specific computer system then generates the faithful color image for display by sending the device independent image and the display specific palette to the display adapter in the specific computer system.

公开(公告)号：DE3687792T2

公开(公告)日：1993-08-19

申请号：DE3687792

申请日：1986-12-18

Applicant: IBM

Inventor： MELTZER CLIFFORD BENNETT ,  KANNAN KRISHNAMURTHI ,  BURKET THOMAS GERARD ,  KRUESI DEBORAH JEAN ,  BRAUDAWAY GORDON WESLEY

IPC: H04N7/173 ,  H04L1/00 ,  H04L1/16 ,  H04L29/08 ,  H03M13/00

Abstract: Automatic detection of and recovery from errors of transmissions in the form of a sequence of data packets is described as well as an improved combination of end-of-text (ETX) bytes along with checksums in each data packet to detect errors. The ETX character (12) is dynamically selected for each packet after the data comprising the packet has been assembled. This character is coded differently from the remaining character codes in its respective packet and is made the second byte thereof following the start-of-text byte (STX). The third byte (3) in each packet is made the complement of the preceding ETX byte, the latter of which is also made the last byte in the packet. Other bytes in each packet include: one byte (4) indicating the location of the packet in a set in a given transmission sequence; a byte (7) distinguishing the packet's set from other transmission sequences; two bytes (5,6) indicative of the number of data bytes in the packet; one byte (8) operating as a control character indicating the functional nature of the packet; data bytes; and two checksum bytes (9,10+m) which precede the last ETX byte. Upon detection of an error in a packet, the transmitter is immediately notified and retransmission is carried out only from the erroneous packet rather than from the beginning of the entire sequence as in the prior art.