公开(公告)号：CA1171517A

公开(公告)日：1984-07-24

申请号：CA354501

申请日：1980-06-20

Applicant: IBM

Inventor： KANTOR SHERWOOD ,  MADDOX RANDALL A ,  YOSIM PAUL S

IPC: H04N1/387 ,  G06K9/32 ,  G06T1/00 ,  H04N1/00 ,  H04N1/047 ,  H04N1/10 ,  H04N1/113 ,  H04N1/19 ,  H04N1/193 ,  H04N1/04

Abstract: APPARATUS AND METHOD FOR CORRECTING DIMENSIONAL VARIATIONS BETWEEN THE ARRAYS OF A MULTIPLE ARRAY SCANNER Dimensional variations, such as skew, alignment and abutment, in an array scanner are corrected by scanning and storing into a storage means an uncorrected electronic Image generated from a test pattern. Correctional factors are generated from the stored electronic image. The correctional factors are used to correct the dimensional variations in the electronic image of the test pattern and/or dimensional variations in subsequent electronic image outputted from the scanner. BO978056

公开(公告)号：CA2092630A1

公开(公告)日：1993-12-26

申请号：CA2092630

申请日：1993-03-12

Applicant: IBM

Inventor： LUCAS BRUCE D ,  MACINNIS ALEXANDER G ,  YOSIM PAUL S

IPC: G09G5/00 ,  G09G3/20 ,  G09G5/02 ,  H04N1/64 ,  H04N11/04 ,  G06F15/62

Abstract: This invention provides a method of and apparatus for compressing digital video color signals derived from a natural image and generating display signals for a color image composed of pixels derived from the compressed signals in which digital color signals representative of color depth intensities of three colors for each pixel to be displayed, each color signal having at least four bits representing the color intensity of a corresponding color for a corresponding pixel and arranged from most to least significant bits, are received; a digital dither signal for each pixel to be displayed is generated; a selected number of the most significant bits of each received color signal are summed with the corresponding generated dither signal; a selected number of the least significant bits of the summed color and dither signals are discarded to compress the corresponding received color signal; the compressed color signals related to a common pixel are concatenated to generate a digital output signal having a predetermined bit length less than the summed bit lengths of the received digital color signals and representative of the depth intensities of three colors for the common pixel; and analog display driver signals representative of the color intensities of pixels to be displayed are generated by selecting from a color lookup table stored in a digital to analog converter analog signals corresponding to the stored output signals.

公开(公告)号：CA1235537A

公开(公告)日：1988-04-19

申请号：CA481698

申请日：1985-05-16

Applicant: IBM

Inventor： RACKLEY DARWIN P ,  SAENZ JESUS A ,  YOSIM PAUL S

IPC: G09G5/18 ,  G06F3/153 ,  G09G1/16 ,  G09G1/28 ,  G09G5/00 ,  G09G5/02 ,  G09G5/04 ,  G09G5/36

Abstract: DIGITAL DISPLAY SYSTEM A digital display system includes a monitor arranged to receive digital display data and synchronizing signals to develop displays on a cathode ray tube. The monitor is switched between different line structure and/or color definition modes in response to the polarity of one of the vertical or horizontal synchronizing signals trains. A circuit receives this train to provide control signals to the horizontal time base and/or a color signal code converter. The time base control signal, in accordance with its binary value, controls the frequency of the time base. The color converter, in response to the control signals, either passes color signals received in parallel over six input lines without change to the cathode ray tube drive circuits or converts color signals on four of the input lines to output signals on the six lines to the drive circuits.

公开(公告)号：AU4254985A

公开(公告)日：1986-01-23

申请号：AU4254985

申请日：1985-05-16

Applicant: IBM

Inventor： RACKLEY DARWIN P ,  SAENZ JESUS A ,  YOSIM PAUL S

IPC: G09G5/18 ,  G06F3/153 ,  G09G1/16 ,  G09G1/28 ,  G09G5/00 ,  G09G5/02 ,  G09G5/04 ,  G09G5/36 ,  H04N3/27 ,  H04N3/32 ,  H04N5/46

Abstract: A digital display system includes a monitor arranged to receive digital display data and synchronising signals to develop displays on a cathode ray tube. The monitor is switched between different line structure and/or colour definition modes in response to the polarity of one of the vertical or horizontal synchronising signals trains. A circuit receives this train to provide control signals to the horizontal time base and/or a colour signal code converter. The time base control signal, in accordance with its binary value, controls the frequency of the time base. The colour converter, in response to the control signals, either passes colour signals received in parallel over six input lines without change to the cathode ray tube drive circuits or converts colour signals on four of the input lines to output signals on the six lines to the drive circuits.