Format independent visual communications

• US 4,897,799 A
• Filed: 09/15/1987
• Issued: 01/30/1990
• Est. Priority Date: 09/15/1987
• Status: Expired due to Fees

• Current Assignee: Telcordia Technologies Incorporated (Telefonaktiebolaget LM Ericsson)
• Original Assignee: Bell Communications Research, Inc. (Telefonaktiebolaget LM Ericsson)
• Inventors: Le Gall, Didier J., Robbins, John D.
• Primary Examiner(s): Lall, Parshotam S.
• Assistant Examiner(s): Trans, V. N.
• Application Number:
  US07/096,738
• Time in Patent Office: 868 Days
• Field of Search: 364/514, 364/518, 364/521, 364/522, 364/200, 364/900, 358/257, 358/11, 358/12, 358/256, 340/720, 340/721, 340/812
• US Class Current: 709/246
• CPC Class Codes: G06F 3/14 Digital output to display device ; Cooperation and interconnection of the display device with other functional units
• CPC Class Codes: G09G 1/16 the pattern of rectangular co-ordinates extending over the whole area of the screen, i.e. television type raster
• CPC Class Codes: G09G 1/167 Details of the interface to the display terminal specific for a CRT details suitable for both CRT and flat panel G09G5/006, specific for a flat panel G09G3/2096
• CPC Class Codes: H04N 1/33315 reading or reproducing mode only, e.g. sheet size, resolution
• CPC Class Codes: H04N 1/33338 adapting to particular facsimile group, e.g. G3
• CPC Class Codes: H04N 1/64 Systems for the transmission or the storage of the colour picture signal; Details therefor, e.g. coding or decoding means therefor H04N19/00 takes precedence

Abstract

A method for enabling format independent communication of visual information between diverse computers, work stations, and terminals is disclosed. The inventive method relies on a universal format which can be used to represent the data comprising any raster display. Illustratively, the data comprising a raster display is first translated from the native format of an originating system into the universal format. When in the universal format, it is possible to convert the raster from one type to another (e.g., from color to pseudo-color or grey to pseudo-color) so that the raster can be displayed by a receiving system which comprises equipment different from that of the originating system.

Claims

1. A method for enabling the transmission of raster image data having a first raster format from a first display system to a second display system which uses a second raster format, said method comprising the steps of

providing a universal conversion unit including a group of algorithms for converting data from one raster format out of a multiplicity of possible raster formats to another raster format out of said multiplicity of possible raster formats,

comparing at said universal conversion unit information explicitly identifying a plurality of predetermined characteristics of said first raster format with information explicitly identifying a plurality of predetermined characteristics of said second raster format, said first and second raster formats belonging to said multiplicity of raster formats,

based on said comparison, selecting a subset of algorithms from said group of algorithms, said selected subset of algorithms comprising the subset of algorithms from said group of algorithms necessary to convert said raster image data in said first raster format to said second raster format,

processing said raster image data in said first raster format with said selected subset of algorithms so that said raster image data in said first raster format is converted to said second raster format, and

receiving said raster image data in said second raster format at said second display system.

2. The method of claim 1 wherein said predetermined characteristics of said first and second raster formats include pixel aspect ratio, color mode, raster size and number of bits per pixel.

3. A method for transmitting image data in a first raster format characterized by a first pixel aspect ratio, a first color mode, a first raster size and a first number of bits per pixel from a first display system to a second display system capable of displaying image data in a second raster format characterized by a second pixel aspect ratio, a second color mode, a second raster size and a second number of bits per pixel, said method comprising the steps,

providing a raster format conversion unit including a group of algorithms capable of selectively converting the pixel aspect ratio, color mode, raster size and numbers of bits per pixel of data in a raster format,

transmitting from said first display system to said conversion unit data explicitly identifying said first aspect ratio, first color mode, first raster size, and first number of bits per pixel of said first raster format,

transmitting from said second display system to said conversion unit data explicitly identifying said second aspect ratio, second color mode, second raster size and second number of bits per pixels of said second raster format,

comparing at said conversion unit said first and second aspect ratios, color modes, raster sizes and numbers of bits per pixel,

based on said comparing step, selecting one or more algorithms from said group of algorithms for converting said image data in said first raster format and having said first aspect ratio, first color mode, first raster size and first number of bits per pixel into image data in said second raster format and having said second aspect ratio, second color mode, second raster size and second number of bits per pixel, and processing said image data in said first raster format using said one or more selected algorithms so that said image data is converted into said second raster format for display at said second display system.