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Coding method and coder

An encoding method and encoding device technology, applied in the direction of code conversion, digital recording/reproduction, electrical components, etc., can solve the problems that cannot expect high processing speed, etc.

Inactive Publication Date: 2007-06-06
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0050] However, in order to perform the above-mentioned rounding processing on each piece of data which is an initial set of raw data (for example, multivalued image data), processing in proportion to the amount of data is required, and a high processing speed cannot be expected.

Method used

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  • Coding method and coder

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no. 2 Embodiment approach

[0292]FIG. 16 shows another example of the compressed bit recoding unit of the present invention (second embodiment).

[0293] The compressed bit encoding device in FIG. 16 adds a raw_data signal to the data division unit 1401 in order to input not only the compressed bit encoded data but also the compressed bit encoded data from encode_data (1410).

[0294] In the compressed bit encoding device according to the second embodiment, when 0 is input from raw_data, the data division unit 1401 performs the operation when the compressed bit encoded data is input from encode_data (111) as shown in FIG. 2 . When 1 is input, the operation is performed when the original data before compressed bit encoding is input from encode_data (111).

[0295] When raw data is input from encode_data (111), the input data is output from data (115) to the data processing unit 102, and at the same time, 1 (01h) is output from num (116) as the continuous number of data.

[0296] Thus, in the data combin...

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Abstract

This invention re-encodes encoded data (e.g., PackBits encoded data), which is expressed by a data format of a runlength code part indicating the runlength of the same data and a data part indicating the data, and a runlength code part indicating the runlength of a different data stream and a data part indicating the different data stream, to the same data format without decoding that encoded data, thereby improving a compression ratio. To this end, upon reception of data encoded by a PackBits encoding process, a data division unit separates that data into information indicating the runlength of data, and a data part, and outputs them as num and data. A data processing unit masks a predetermined bit in accordance with an instruction from a monitor unit, and outputs that result to a data combining unit. The data combining unit and a data output unit reconstruct and output data in the PackBits format in accordance with the masked data part and num data.

Description

technical field [0001] The present invention relates to the technique of processing encoded data and performing re-encoding. Background technique [0002] As a compression coding technique for data, Pack Bit Sencoding (Pack Bit Sencoding) is well known. This compressed bit encoding is one of run-length encodings, and can be decoded without loss of information before encoding, that is, it is also lossless encoding. [0003] In the following, description will be made on the assumption that one piece of data as a unit to be coded is composed of 8 bits and compressed bit coding is performed (data is, for example, 8-bit multi-valued pixel data). In addition, data before encoding is called original data, and a stream of original data before encoding is called original data stream. [0004] Compression bit coding refers to distinguishing original data into "parts in which the same data continues" and "parts in which different data continues" and "length information" of data is ad...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M7/46G11B20/10H04N1/41H04N1/419H04N19/00H04N19/40H04N19/423H04N19/48H04N19/90H04N19/93
CPCH03M7/46H04N19/00957H04N19/93
Inventor 梅田嘉伸
Owner CANON KK