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.

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.