-
公开(公告)号：DE3689280D1
公开(公告)日：1993-12-16
申请号：DE3689280
申请日：1986-08-26
Applicant: IBM
Inventor： GUPTA SATISH , LUCAS BRUCE DAVID
Abstract: A method for improving the viewing quality of a CRT display image without increasing resolution of the display. With the invention disclosed herein, characters are apparently positioned at sub-pixel locations to improve the viewing quality of a CRT display image. This apparent positioning is accomplished by changing intensity values assigned to pixels on a CRT display. In the preferred embodiment, the change in intensity values is effected by linear interpolation with intensity values of neighbouring pixels to yield second intensity values. These second intensity values, then, improve the viewing quality of the CRT display image.
-
公开(公告)号：DE3485479D1
公开(公告)日：1992-03-05
申请号：DE3485479
申请日：1984-11-27
Applicant: IBM
Inventor： BANTZ DAVID FREDERICK , GUPTA SATISH , LUCAS BRUCE DAVID
-
Patent Agency Ranking
公开(公告)号：BR9100844A
公开(公告)日：1991-11-05
申请号：BR9100844
申请日：1991-03-01
Applicant: IBM
Inventor： LUCAS BRUCE DAVID , RACKLEY DARWIN P , SAENZ JESUS ANDRES
Abstract: Method and apparatus for converting multibit pixel data to a lesser number of bit pixel data and re-expanding the compressed data. Luminance data for each pixel is established as the 5 most significant bits of the original luminance signal. The chrominance information for groups of pixels is subsampled, and a common chrominance value assigned to each of the pixels in a group. The resulting compressed pixels may be 8 bits wide providing economical possibilities to store the 8 bit wide data. The data is expanded for display by adding lower order data bits to the compressed luminance signal data bits. A subsampled chrominance data signal is appended to the expanded luminance data for display.
-
公开(公告)号：CA2092630C
公开(公告)日：1998-12-22
申请号：CA2092630
申请日：1993-03-12
Applicant: IBM
Inventor： LUCAS BRUCE DAVID , MACINNIS ALEXANDER GARLAND , YOSIM PAUL STEWART
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：DE68915232T2
公开(公告)日：1994-11-10
申请号：DE68915232
申请日：1989-09-02
Applicant: IBM
Inventor： LARKY STEVEN PHILIP , LUCAS BRUCE DAVID , MCCABE DANIEL HELMUT , RODGERS TODD KANNER
Abstract: A color display device which includes dither apparatus for each primary color to be displayed. A dither matrix provides a dither signal output as a function of the position of a pixel on the color display device. An input primary color signal includes an integer signal and a fraction signal. The integer signal is incremented by an incrementer. There is means for providing an output primary color signal which is the incremented signal whenever a predetermined relationship exists between the dither signal and the fraction signal, and which is the integer signal whenever the predetermined relationship does not exist.
-
公开(公告)号：DE68915232D1
公开(公告)日：1994-06-16
申请号：DE68915232
申请日：1989-09-02
Applicant: IBM
Inventor： LARKY STEVEN PHILIP , LUCAS BRUCE DAVID , MCCABE DANIEL HELMUT , RODGERS TODD KANNER
Abstract: A color display device which includes dither apparatus for each primary color to be displayed. A dither matrix provides a dither signal output as a function of the position of a pixel on the color display device. An input primary color signal includes an integer signal and a fraction signal. The integer signal is incremented by an incrementer. There is means for providing an output primary color signal which is the incremented signal whenever a predetermined relationship exists between the dither signal and the fraction signal, and which is the integer signal whenever the predetermined relationship does not exist.
-
公开(公告)号：DE3689280T2
公开(公告)日：1994-05-11
申请号：DE3689280
申请日：1986-08-26
Applicant: IBM
Inventor： GUPTA SATISH , LUCAS BRUCE DAVID
Abstract: A method for improving the viewing quality of a CRT display image without increasing resolution of the display. With the invention disclosed herein, characters are apparently positioned at sub-pixel locations to improve the viewing quality of a CRT display image. This apparent positioning is accomplished by changing intensity values assigned to pixels on a CRT display. In the preferred embodiment, the change in intensity values is effected by linear interpolation with intensity values of neighbouring pixels to yield second intensity values. These second intensity values, then, improve the viewing quality of the CRT display image.
-
-
-
-
-
-
Search Results
7
records
(took 0.017 seconds)
