Image data transfer system using object reference table

Details Image data transfer system using object reference table Image data transfer system using object reference table

1997-12-15

2000-05-23

Amsbury, Wayne

Data processing: database and file management or data structures

Database design

Data structure types

707513, 707514, 707517, 707101, 395117, G06F 1500

Patent

active

060675535

DESCRIPTION:

BRIEF SUMMARY
The present invention relates to a system for making data available to a plurality of viewing stations, comprising data storage apparatus and means for writing received data to said data storage apparatus, wherein said writing means receives data defined in accordance with a standard document format having object definitions, references to said definitions and a structure table.


INTRODUCTION

Over recent years advances have been made concerning the speed of data communication over existing telecommunications networks. With appropriate interfacing equipment, existing speech-based telephone lines may be used for transferring significant amounts of data between data processing environments. Such interfacing circuits transmit data over the speech-based telephone lines by a process of modulation and a complementary process of demodulation is then performed at the receiving station; a device capable of performing both of these operations is generally referred to as a modem.
Various advances in the design of modem circuitry have facilitated significant improvements to the rates at which data is transmitted over existing telephone lines. Furthermore, additional improvements have recently been achieved by the establishment of data compression standards. These enable greater data rates of data transfer to be achieved by the removal of redundancy within binary code streams and by the use of code libraries, that provide a digital shorthand for those binary codes which are most often used, such as codes representing selected letters of the alphabet.
Alternatively, dedicated high-speed data communications lines, such as the integrated services digital network (ISDN) may be used. Thus, as a result of improvements made in speed of data communication over telecommunications lines, services are now provided to customers generally referred to as "on-line" services.
Many standards exist for the transmission and reception of data. The most widely used of these is the American Standard Code for Information Interchange (ASCII). ASCII represents symbols and characters of the English alphabet with seven or eight bit binary codes. A large amount of information stored on remotely accessible databases is stored by means of ASCII codes and when a database is accessed using a suitably configured terminal, ASCII data is transferred to the terminal, with each ASCII code representing a letter of the alphabet, a numerical value or a simple symbol. In addition, some special codes are also defined to provide line feed, tabulation, new page and other simple text-related features.
The appearance of ASCII files, received by a suitable terminal, is not very elegant. Even subtle variations in text format, such as font size and appearance, underlining and italics, cannot be achieved using the accepted ASCII protocol. Thus, a file which was originally part of a magazine article, for example, and which included various sizes of text and various fonts for sub-headings etc. must have substantially all of this layout information removed if it is to be rendered as a sequence of ASCII symbols for transmission purposes. Furthermore, this process is not suitable for the transmission of associated illustrations and graphics etc.
A standard for data communication between computers and printers has been developed by Adobe Systems Incorporated and marketed under the trade mark "PostScript". PostScript defines a large number of codes for communicating complex text and graphics in a variety of presentations. Full typesetting information may be defined within a PostScript file, which may be previewed on a small office printer having a medium resolution of a few hundred dots per inch. Once a satisfactory result has been achieved, the file may then be sent to a professional printing house where high quality artwork may be generated using a printer having a resolution of several thousand dots per inch. Thus the PostScript standard has become firmly established as a method of storing and transmitting high quality text and graphical documents.
The widespread accepta

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