Font compression and retrieval

Inactive Publication Date: 2002-08-29
TELEFON AB LM ERICSSON (PUBL)
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Furthermore, each symbol is the size of at least some hundreds of pixels; and, as a result, to store a complete Chinese font requires a large amount of memory.
Such methods are inappropriate for font compression, however; where, ideally, only a single glyph should be decompressed at a time.
If sequential methods of this type are employed, some blocking of the glyphs is required, and a trade-off must be made between the two extremes of com

Method used

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  • Font compression and retrieval
  • Font compression and retrieval
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[0039] By the use of predictive coding, as provided in the second embodiment described above, with a fixed prediction table followed by a fixed Huffman code, it becomes possible to have a very fast decompression while retaining reasonable compression. This method is particularly suitable for hardware implementation.

[0040] In general, in the present invention, by using an indexing method with a length table, and indexing tables in which are performed at least one search; each table is reduced to a list of identifiers. With the present invention, the total size of the addressing tables are only marginally larger than the space originally occupied by the identifiers; and, thus, we have gained the property of random access to the glyphs with only a slight increase in index table size.

[0041] It should be emphasized that the term "comprises / comprising" when used in this specification is taken to specify the presence of stated features, integers, steps or components, but does not preclude ...

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Abstract

Method and apparatus for compressing data representing a set of symbols such that each symbol of the set can be separately accessed and decompressed. Each symbol of the set of symbols is encoded in the form of a two-pair code wherein a first part of the code is common for all encoded symbols and a second part of the code encodes the data representing a symbol. An identifier is given for each symbol for permitting each encoded symbol to be separately accessed and decompressed. The invention is particularly useful for storing large fonts such as a Chinese or Japanese character set.

Description

[0001] 1. Field of the Invention[0002] The present invention relates generally to the compression and retrieval of data representing a font or other set of symbols; and, more particularly, to a method and apparatus for storing a large font, such as a Chinese or Japanese character set, in a compressed form while retaining access to individual symbols of the font.[0003] 2. Description of the Prior Art[0004] In order to display messages in languages such as Chinese or Japanese on a CRT or an LCD display, a large set of symbols, or glyphs, is required. For example, the Chinese Unicode standard character set contains about 21,000 different Chinese symbols. Furthermore, each symbol is the size of at least some hundreds of pixels; and, as a result, to store a complete Chinese font requires a large amount of memory. Being able to store the glyphs in a more compact format than pure bitmaps will substantially reduce memory requirements.[0005] For laser printers or high resolution displays, a ...

Claims

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Application Information

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IPC IPC(8): G06T9/00H03M7/30
CPCG06T9/00H03M7/30G06V10/20
Inventor SMEETS, BERNARDABERG, JAN
Owner TELEFON AB LM ERICSSON (PUBL)
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