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Page bitmap self-adaptive compression and restoration method and device

A compression method and adaptive technology, applied in the direction of image communication, electrical components, etc., can solve the problem of inappropriate decompression and time-consuming, and achieve the effect of improving decompression efficiency

Inactive Publication Date: 2018-04-27
PEKING UNIV FOUNDER GRP CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The inventor found that, for a VDP job synthesized by multiple VDP jobs, the above method of encoding and compressing based on the previous page is not suitable for decompression. Assuming that the page bitmap of the 1000th page is to be extracted, then It needs to be restored to page 1000 based on the first page. Restoring the dot matrix on the 1000th page is obviously more time-consuming than restoring the dot matrix on the 10th page

Method used

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  • Page bitmap self-adaptive compression and restoration method and device

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Embodiment Construction

[0029] The present invention will be described in further detail below with reference to the accompanying drawings and examples.

[0030] VDP refers to the printing of different content on each printed matter or publication, including text, numbers, pictures, barcodes, etc. For a page of a printing job, data other than variable data is called reusable data, and a page containing only reusable data is called a template page, most typically with one or several common page backgrounds print job. Considering the reusable data of the VDP job, the VDP job has the characteristics of "similar"; if considering the variable data of the VDP job, the VDP job has the characteristics of "different".

[0031] Aiming at the problem of low efficiency in decompression of the method of encoding and compressing based on the previous page in the prior art, the embodiment of the present invention provides a method for adaptive page bitmap compression in the process of encoding and compressing base...

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Abstract

The invention discloses a page dot matrix self-adaptive compression method and device. The method comprises the steps that page dot matrix data in VDP work are acquired with a page acting as a unit; the page dot matrix data are compressed in turn and compression ratio of each page is recorded; and a compression mode is dynamically regulated according to compression ratio, and the compression mode comprises a previous-page-based encoding compression mode and a run length encoding compression mode. The invention also discloses a page dot matrix self-adaptive reduction method and device. With application of the method, decompression efficiency can be enhanced.

Description

technical field [0001] The invention relates to the field of digital printing, in particular to a page dot matrix self-adaptive compression and restoration method and device. Background technique [0002] Make full use of the "similar" characteristics of variable data printing (Variable Data Printing, referred to as VDP), the scheme based on the encoding and compression method of the previous page is that each page is compared with the previous page in dot matrix by unit (BYTE, WORD , DWORD) for sequential comparison, the same part records the length of the same data without recording the dot matrix, and only needs to record the original page dot matrix of the different part, thereby reducing the recording of dot matrix data for reusable dot matrix. [0003] In practical applications, for a VDP printing job, the first page uses a blank page as the reference page for encoding and compression, the second page uses the first page as the reference for encoding and compression, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N1/41
CPCH04N1/41
Inventor 贺杰
Owner PEKING UNIV FOUNDER GRP CO LTD
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