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Method and module for enhancing periodic one-dimensional bar code signal

A dimensional barcode and periodic technology, applied in the field of barcode recognition, which can solve the problems of low signal-to-noise ratio of single original signal, incomplete single signal information, and prolonged decoding time at the later stage.

Active Publication Date: 2017-08-18
西安中颖电子有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the large randomness of the signal, the signal-to-noise ratio of the single original signal is low, which will lead to longer decoding time in the subsequent stage
For contaminated or worn barcodes, the information of a single signal is incomplete, and the traditional method will fail, resulting in missed detection

Method used

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  • Method and module for enhancing periodic one-dimensional bar code signal
  • Method and module for enhancing periodic one-dimensional bar code signal
  • Method and module for enhancing periodic one-dimensional bar code signal

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Embodiment Construction

[0039] The detailed features and advantages of the present invention are described in detail below in the specific embodiments, the content of which is sufficient to enable any person skilled in the art to understand the technical content of the present invention and implement it accordingly, and according to the specification, claims and drawings disclosed in this specification , those skilled in the art can easily understand the related objects and advantages of the present invention.

[0040] A one-dimensional barcode is a symbol composed of lines and blanks according to certain coding rules, such as figure 1 shown. The reader is composed of components such as a light source 201, a vibrating mirror 204, and a signal processing unit, such as figure 2 shown. When identifying the barcode 205, the light emitted by the light source 201 is irradiated on the barcode symbol through the optical system. Since the reflectivity of the lines and blanks is different for light, the ref...

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Abstract

The invention provides a method and a module for enhancing a periodic one-dimensional bar code signal. The method comprises the steps of a, determining a frame period T of a signal acquired by an analog front end, and acquiring Y frames with T as a period; B, sampling the Y frames to obtain Y sampling sequences, wherein each sequence is expressed as x[i][0], x[i][1], x[i][2]......x[i][m-1], wherein Fs=N*(1 / w); c, carrying out weighting processing by use of a weighted sliding window, wherein a window sequence is w[0], w[1],......, w[m-1], carrying out weighting processing on the sampling sequence x[i] in each period, obtaining Y sequences h after weighting, wherein each sequence is expressed as h[i][0], h[i][1], h[i][2],......,h[i][m-1], i=0, 1, ..., (Y-1), h[i][j]=w[j]*x[i][j], and j=0, 1, 2, ...(m-1); d, sliding the weighted Y sequences h in step c with the period T in step a, accumulating signal sequences h in time domain to obtain a repetition-frequency accumulated signal sequence y[0], y[1], y[2],......y[m-1], wherein the formula is as shown in the description, j=0,1,......m-1; e, carrying out extraction on the sequence y in step d with the frequency of Fs / N in step b; and f, selecting a threshold G, and carrying out 1 / 0 judgment on the sequence b.

Description

technical field [0001] The invention relates to barcode identification, in particular to one-dimensional barcode identification technology. Background technique [0002] In the prior art, the image processing and the design of the filter are to sample the original signal once, and fail to take advantage of the periodicity of the signal. Due to the large randomness of the signal, the signal-to-noise ratio of the single original signal is low, which will lead to longer decoding time in the subsequent stage. For contaminated or worn barcodes, the information of a single signal is incomplete, and the traditional method will fail, resulting in missed detection. Contents of the invention [0003] In order to solve the problems of the prior art, the present invention provides a method for strengthening periodic one-dimensional barcode signals, characterized in that the method includes: [0004] a. Determine the frame period T of the analog front-end acquisition signal, and obta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06K7/10
CPCG06K7/10851G06K7/1413
Inventor 冯恒
Owner 西安中颖电子有限公司
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