Encoding method and encoding apparatus, and computer program...

Details Encoding method and encoding apparatus, and computer program... Encoding method and encoding apparatus, and computer program...

2005-10-25

2005-10-25

Tokar, Michael (Department: 2819)

Coded data generation or conversion

Digital code to digital code converters

To or from bit count codes

C341S106000, C382S197000, C382S198000

Reexamination Certificate

active

06958714

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.

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