A Composite Compression/Decompression Method for Pipeline Millisecond Level Online Data

A technology of data compression and composite compression, applied in electrical components, code conversion, etc., can solve the problems of important information loss and high compression ratio

Active Publication Date: 2018-04-06
NORTHEASTERN UNIV LIAONING
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

Lossless compression methods mainly include Huffman coding, arithmetic coding, run-length coding, and dictionary coding, etc., which can realize data lossless compression, but the compression ratio is high; lossy compression methods mainly include wavelet transform compression algorithm, but the lossy compression band The massive loss of important information coming is unacceptable

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  • A Composite Compression/Decompression Method for Pipeline Millisecond Level Online Data
  • A Composite Compression/Decompression Method for Pipeline Millisecond Level Online Data
  • A Composite Compression/Decompression Method for Pipeline Millisecond Level Online Data

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Embodiment Construction

[0071] Below in conjunction with accompanying drawing and concrete example the present invention is described in further detail:

[0072] The composite compression method of pipeline millisecond-level online data in this embodiment, such as figure 1 shown, including the following steps:

[0073] Step 1: Collect the real-time millisecond-level running signal of the pipeline, convert it into an analog electrical signal, filter and amplify it, and then convert it into a digital electrical signal; The number is 150, and the data mainly includes time information and pipeline operating pressure data.

[0074] Step 2: Using the multi-wavelet threshold compression algorithm to perform multi-wavelet transformation on the pipeline operation digital electrical signal in step 1 to obtain a wavelet coefficient matrix with a high-frequency wavelet coefficient part and a low-frequency wavelet coefficient part; the specific method is as follows:

[0075] In this embodiment, the CL4 multi-wa...

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Abstract

The invention discloses a pipeline millisecond online data compound compression / decompression method, belonging to the field of data compression. The method comprises the following steps of: firstly, performing wavelet decomposition for the data, screening high-frequency and low-frequency wavelet coefficients with a threshold value, then, performing lossy compression for the data corresponding to the screened high-frequency wavelet coefficient through a SPIHT algorithm, performing lossy compression for the data corresponding to the screened low-frequency wavelet coefficient through a LZ77 algorithm, and finally obtaining the compression result. In an upper computer, data is decompressed through dSPIHT and dLZ77 methods. The compression method provided by the invention can reduce compression ratio under the premise of guaranteeing information integrity, save space for storage of millisecond data of a lot of pipelines and improve speed of data transmission; and the decompression method provided by the invention not only can guarantee decompression speed, but also can guarantee accuracy and integrity of recovered information.

Description

Technical field [0001] The invention belongs to the field of data compression, and in particular relates to a compound compression / decompression method for pipeline millisecond-level online data. Background technique [0002] With the laying of oil and gas pipelines at home and abroad getting longer and longer and the transportation volume gradually increasing, the safety and efficiency of oil and gas pipeline transportation have received greater attention. During the years of use of oil and gas pipelines, it is inevitable that they will be corroded and worn by the external environment and internal environment, as well as other unexpected damages, which will cause oil and gas to leak during the transportation process. Once a leak occurs, it will not only cause huge economic losses and a huge waste of energy, but also pollute the environment and even endanger human safety. Since the online detection system is used for pipeline leak detection, the length of the pipeline to be...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03M7/30
Inventor 张化光马大中冯健李晓瑜胡旭光刘金海汪刚陈杨
Owner NORTHEASTERN UNIV LIAONING
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