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    12.
    发明专利
    未知

    公开(公告)号：DE69222247D1

    公开(公告)日：1997-10-23

    申请号：DE69222247

    申请日：1992-07-16

    Applicant: IBM

    Inventor： CHOI SUNG MIN ,  LUMELSKY LEON ,  PEEVERS ALAN WESLEY ,  PITTAS JOHN LOUIS ,  SWART CALVIN BRUCE

    IPC: H04N5/202 ,  G06T5/00 ,  G09G1/28 ,  G09G5/04 ,  G09G5/39

    Abstract: An image display system includes an input to a source (10, 12, 14) of image pixel data wherein each pixel is expressed as an M-bit value within a non-linear range of values. A first LUT (16) is coupled to an output of the source for converting each M-bit pixel value to an N-bit value within a linear range of values. An image memory, or frame buffer (18), has an input coupled to an output of the first LUT for storing the N-bit pixel values. The system further includes a second LUT (20) coupled to an output of the frame buffer for converting N-bit pixel values output by the frame buffer to P-bit pixel values within a non-linear range of values. The converted values are subsequently applied to a display (24). In an exemplary embodiment, the first LUT stores gamma corrected pixel values and the second LUT stores inverse gamma corrected pixel values. Preferably the second LUT stores a plurality of sets of inverse gamma corrected pixel values. Also, the frame buffer stores, for each of the N-bit pixel values, a value that specifies a particular one of the plurality of sets of inverse gamma corrected pixel values for use in converting an associated one of the N-bit pixel values.

    15.
    发明专利
    未知

    公开(公告)号：DE68917771T2

    公开(公告)日：1995-03-30

    申请号：DE68917771

    申请日：1989-04-13

    Applicant: IBM

    Inventor： GUPTA SATISH ,  LARKY STEVEN PHILIP ,  PEEVERS ALAN WESLEY ,  ST CLAIR JOE CHRISTOPHER

    IPC: G09G1/02 ,  G06F3/153 ,  G06F12/08 ,  G06F12/10 ,  G09G5/00 ,  G09G5/14 ,  G09G5/36 ,  G09G5/39 ,  G09G1/16 ,  G09G1/00

    Abstract: A display control means such as a virtual display adapter (110) allows the advanced functions of a display controller to be utilized in a large area of memory in addition to the normal use in display memory (120). This large area of memory includes system memory (130), and efficient access to this large area of memory is permitted for normal system use. The display controller also functions with non-contiguous and non-resident bitmaps. The flexibility of demand-paged virtual memory is utilized for display tasks, as display bitmaps may be written to the large area of memory as well as the display memory.

    17.
    发明专利
    未知

    公开(公告)号：DE69222247T2

    公开(公告)日：1998-03-26

    申请号：DE69222247

    申请日：1992-07-16

    Applicant: IBM

    Inventor： CHOI SUNG MIN ,  LUMELSKY LEON ,  PEEVERS ALAN WESLEY ,  PITTAS JOHN LOUIS ,  SWART CALVIN BRUCE

    IPC: H04N5/202 ,  G06T5/00 ,  G09G1/28 ,  G09G5/04 ,  G09G5/39

    Abstract: An image display system includes an input to a source (10, 12, 14) of image pixel data wherein each pixel is expressed as an M-bit value within a non-linear range of values. A first LUT (16) is coupled to an output of the source for converting each M-bit pixel value to an N-bit value within a linear range of values. An image memory, or frame buffer (18), has an input coupled to an output of the first LUT for storing the N-bit pixel values. The system further includes a second LUT (20) coupled to an output of the frame buffer for converting N-bit pixel values output by the frame buffer to P-bit pixel values within a non-linear range of values. The converted values are subsequently applied to a display (24). In an exemplary embodiment, the first LUT stores gamma corrected pixel values and the second LUT stores inverse gamma corrected pixel values. Preferably the second LUT stores a plurality of sets of inverse gamma corrected pixel values. Also, the frame buffer stores, for each of the N-bit pixel values, a value that specifies a particular one of the plurality of sets of inverse gamma corrected pixel values for use in converting an associated one of the N-bit pixel values.

    Multi-source image real time mixing and anti-aliasing
    18.
    发明专利
    Multi-source image real time mixing and anti-aliasing 未知

    公开(公告)号：SG43717A1

    公开(公告)日：1997-11-14

    申请号：SG1996000134

    申请日：1992-07-02

    Applicant: IBM

    Inventor： CHOI SUNG MIN ,  LUMELSKY LEON ,  PEEVERS ALAN WESLEY ,  PITTAS JOHN LOUIS

    IPC: G09G5/06 ,  G06T3/00 ,  G06T11/20 ,  G09G5/14 ,  G09G5/36 ,  G09G5/395 ,  H04N5/265 ,  H04N5/272 ,  H04N5/262 ,  G09G1/16

    Abstract: Method and apparatus for implementing a raster graphic display video data path that provides arbitrary mixing of a plurality of images. The video data path is highly parallelized, and employs parallel devices operating under the control of a set of look-up tables. The look-up tables are loadable from a controller, such as a host workstation. The raster graphic display video data path functions with unlimited screen resolutions, and also enables a variety of different pixel data formats from a potentially large number of different sources. Outputs from several image sources are mixed under the control of the host workstation, with a resultant pixel value being based on (a) a combined translucency coefficient (alpha) of the images, for each image source, and (b) a window identification number assigned by the host workstation. Pixel value conversion to a common predetermined format provides coherency between pixel values generated by a number of different image sources, such as HDTV and graphics servers. A separate frame buffer is allocated for each of the sources.

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