Barcode reader, method and program for reading barcode, and module-point extracting apparatus
First Claim
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1. A barcode reader comprising:
- a signal fetching unit that fetches a signal that includes binarized information disposed with a predetermined information length, from a barcode;
a module-frequency extracting unit that extracts a module frequency equivalent to a basic unit length in the binarized information, from the signal;
a frequency shifting unit that shifts a frequency to 0 Hertz based on the module frequency, for the signal;
a low pass filter that passes a low frequency component included in an output signal from the frequency shifting unit;
a module-point extracting unit that extracts a module point that is synchronized with the signal and that has the module frequency, based on the module frequency extracted and an output signal of the low pass filter; and
a demodulating unit that demodulates a character of the barcode based on the module point extracted.
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Abstract
A signal fetching unit fetches a signal that includes binarized information disposed with a predetermined information length, from a barcode. A module-frequency extracting unit extracts a module frequency equivalent to a basic unit length in the binarized information from the signal. A frequency shifting unit shifts a frequency to 0 Hz based on the module frequency for the signal. A low pass filter passes a low frequency component included in an output signal from the frequency shifting unit. A module-point extracting unit extracts a module point synchronized with the signal and that has the module frequency, based on the module frequency extracted and an output signal of the low pass filter. A demodulating unit demodulates a character of the barcode based on the module point extracted.
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Citations
10 Claims
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1. A barcode reader comprising:
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a signal fetching unit that fetches a signal that includes binarized information disposed with a predetermined information length, from a barcode; a module-frequency extracting unit that extracts a module frequency equivalent to a basic unit length in the binarized information, from the signal; a frequency shifting unit that shifts a frequency to 0 Hertz based on the module frequency, for the signal; a low pass filter that passes a low frequency component included in an output signal from the frequency shifting unit; a module-point extracting unit that extracts a module point that is synchronized with the signal and that has the module frequency, based on the module frequency extracted and an output signal of the low pass filter; and a demodulating unit that demodulates a character of the barcode based on the module point extracted. - View Dependent Claims (2, 3, 4, 5)
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6. A method of reading a barcode, the method comprising:
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fetching a signal that includes binarized information disposed with a predetermined information length, from a barcode; extracting a module frequency equivalent to a basic unit length in the binarized information, from the signal; shifting a frequency to 0 Hertz based on the module frequency, for the signal; passing a low frequency component included in an output signal at the shifting; extracting a module point that is synchronized with the signal and that has the module frequency, based on the module frequency extracted and an output signal at the passing; and demodulating a character of the barcode based on the module point extracted.
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7. A computer-readable recording medium that stores a computer program for reading a barcode, wherein the computer program makes a computer execute:
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fetching a signal that includes binarized information disposed with a predetermined information length, from a barcode; extracting a module frequency equivalent to a basic unit length in the binarized information, from the signal; shifting a frequency to 0 Hertz based on the module frequency, for the signal; passing a low frequency component included in an output signal at the shifting; extracting a module point that is synchronized with the signal and that has the module frequency, based on the module frequency extracted and an output signal at the passing; and demodulating a character of the barcode based on the module point extracted.
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8. A module-point extracting apparatus comprising:
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a signal fetching unit that fetches a signal that includes binarized information disposed with a predetermined information length, from a barcode; a module-frequency extracting unit that extracts a module frequency equivalent to a basic unit length in the binarized information, from the signal; a frequency shifting unit that shifts a frequency to 0 Hertz based on the module frequency, for the signal; a low pass filter that passes a low frequency component included in an output signal from the frequency shifting unit; and a module-point extracting unit that extracts a module point that is synchronized with the signal and that has the module frequency, based on the module frequency extracted and an output signal of the low pass filter. - View Dependent Claims (9, 10)
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Specification
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Current AssigneeFujitsu Frontech Limited (Fujitsu Limited), Fujitsu Limited
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Original AssigneeFujitsu Frontech Limited (Fujitsu Limited), Fujitsu Limited
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InventorsKaku, Takashi, Miyazawa, Hideo, Watanabe, Mitsuo, Yamazaki, Kozo, Iwaguchi, Isao, Ohkawa, Masanori
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Primary Examiner(s)LE, THIEN MINH
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Application NumberUS11/067,342Publication NumberTime in Patent Office463 DaysField of Search23546201-46245, 235/472.01, 235/472.02, 235/472.03, 235/454, 235/455, 235/494, 382/141, 455/456.1US Class Current235/462.25CPC Class CodesG06K 7/10851 Circuits for pulse shaping,...G06K 7/14 using light without selecti...
