CN112507754A - Scanning decoding system and method - Google Patents
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- CN112507754A CN112507754A CN202011417652.7A CN202011417652A CN112507754A CN 112507754 A CN112507754 A CN 112507754A CN 202011417652 A CN202011417652 A CN 202011417652A CN 112507754 A CN112507754 A CN 112507754A
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Abstract
The invention provides a scanning decoding system and a method. The scanning decoding system comprises a light source component, a receiving component, a voltage conversion component and a control component, wherein the voltage conversion component is electrically connected with the receiving component and is used for receiving the current signal and converting the current signal into a voltage signal; the control component is electrically connected with the voltage conversion component and used for decoding the voltage signal; the control assembly further comprises a signal processing module, wherein the signal processing module is used for generating a control signal and an evaluation value from the voltage signal which cannot be decoded by the control assembly, and adjusting the light source assembly, the receiving assembly or the voltage conversion assembly through the control signal and the evaluation value. The scanning decoding system can efficiently and quickly finish the identification of the bar code, has good scanning sensitivity and accuracy, is convenient and fast in scanning and decoding method, and is suitable for popularization and use.
Description
Technical Field
The invention relates to a scanning decoding system and a scanning decoding method, belonging to the technical field of scanning decoding.
Background
With the development of technology, barcode payment scanning, application scanning and the like are more and more involved in life. The scanner is a reading device for reading information contained in the bar code, and the content of the bar code is decoded and transmitted to a computer or other identification devices through a data line or a wireless mode by using an optical principle. The bar code scanner is widely applied to a plurality of fields such as commercial POS cash register systems, express storage logistics, book and clothing medicines, bank insurance communication and the like.
The commodity bar code scanning device is a code scanner, a machine for reading commodity bar code information. The commodity bar code scanning device emits a laser light source, the chip is used for decoding according to the laser reflection result, and finally the correct character represented by the bar code is returned. Specifically, the barcode of the commodity is formed by combining black and white lines, and the barcode scanner judges the width of the barcode by means of the difference of the reflection degree of the black and white to the laser, so that voltages with different heights are generated according to the difference of the intensity of the reflected light, and further logical data decoding is generated.
However, due to the influence of the external environment light and the material of the bar code itself, the sensitivity and accuracy of code scanning are affected. For example, in a dark environment, since the reflected light is weak, the optical signal received by the photodiode is also weak, which often causes failure of subsequent decoding; alternatively, if the bar code is printed on a material with a green background color, the reflectivity of the material is low, which also causes the light signal received by the photodiode to be weak, and thus the subsequent decoding is often failed.
In view of the above, it is necessary to provide a new scan decoding method to solve the above problem.
Disclosure of Invention
The invention aims to provide a scanning and decoding system and a method, the scanning and decoding system can efficiently and quickly finish the identification of a bar code, has good scanning sensitivity and accuracy, is convenient and fast in scanning and decoding method, and is suitable for popularization and use.
In order to achieve the above object, the present invention provides a scanning and decoding system, including a light source assembly for emitting scanning light to a barcode to be scanned; the receiving component is used for receiving the reflected light signal reflected by the bar code to be scanned and converting the reflected light signal into a current signal; the voltage conversion assembly is electrically connected with the receiving assembly and is used for receiving the current signal and converting the current signal into a voltage signal; the control component is electrically connected with the voltage conversion component and used for decoding the voltage signal; the control assembly further comprises a signal processing module, wherein the signal processing module is used for generating a control signal and an evaluation value from the voltage signal which cannot be decoded by the control assembly, and adjusting the light source assembly, the receiving assembly or the voltage conversion assembly through the control signal and the evaluation value.
As a further improvement of the present invention, the evaluation value is an adjustment value, and the evaluation value is a difference between a minimum voltage value recognizable by the digital-to-analog conversion module and a voltage value unrecognizable by the digital-to-analog conversion module actually.
As a further improvement of the present invention, the receiving component includes a photodiode and an adjusting component, the photodiode is used for receiving a reflected light signal reflected by a bar code to be scanned and converting the reflected light signal into a current signal; the adjusting component is used for adjusting the performance of the photodiode; and a light receiving surface of the receiving assembly is provided with a filtering device for filtering interference light.
As a further improvement of the present invention, the adjusting component is electrically connected to the control component and the photodiode respectively, and includes a determining module, a negative voltage circuit electrically connected to the determining module, and a feedback module connected between the negative voltage circuit and the determining module.
As a further improvement of the present invention, the determining module is electrically connected to the control component, and is configured to receive the control signal and the evaluation value fed back by the signal processing module, and control the opening of the negative voltage circuit.
As a further improvement of the present invention, the feedback module is electrically connected to the negative voltage circuit and the determination module, respectively, and is configured to monitor a voltage value actually output by the negative voltage circuit in real time, and feed back the voltage value actually output by the negative voltage circuit to the determination module.
As a further improvement of the present invention, the voltage conversion module is electrically connected to the receiving module, and is configured to receive the current signal and convert the current signal into a voltage signal, and the voltage conversion module includes an I/V conversion module, and the I/V conversion module is configured to convert the current signal acquired by the receiving module into a voltage signal with a certain pulse width.
As a further improvement of the present invention, the voltage conversion module further includes a signal amplification module electrically connected to the I/V conversion module, and the signal amplification module is configured to multiply and amplify the voltage signal converted by the I/V conversion module.
As a further improvement of the present invention, the control component further includes a digital-to-analog conversion module electrically connected to the signal processing module, and the digital-to-analog conversion module is electrically connected to the voltage conversion component to decode and output the voltage signal.
As a further improvement of the present invention, the light source assembly includes a light source body and an adjustable component electrically connected to the light source body, the adjustable component is electrically connected to the control assembly, and the adjustable component can adjust the illumination intensity of the light source body under the control of the control assembly; the light source component is internally provided with a light source wavelength adjustable device used for adjusting the wavelength of the scanning light.
In order to achieve the above object, the present invention further provides a scanning decoding method, including the following steps:
s1, the light source component emits scanning light to the bar code to be decoded;
s2, the receiving component receives the reflected light reflected by the bar code to be decoded and converts the reflected light signal into a current signal;
s3, the voltage conversion component receives the current signal transmitted by the receiving component and converts the current signal into a voltage signal;
s4, the control component identifies the voltage signal, and if the voltage signal can be identified, the control component directly outputs a decoding result; if the control component can not identify the voltage signal, the control component controls the receiving component to enhance the performance and repeatedly executes the steps S1-S4 until the decoding result is output.
As a further improvement of the present invention, the receiving module includes a photodiode and a regulating module, and the step S2 specifically includes:
s21, the photodiode receives the reflected light signal reflected by the bar code to be decoded and converts the reflected light signal into a current signal;
s22, the adjusting component receives the control signal and the evaluation value of the control component to control the opening or closing of the negative pressure circuit in the adjusting component;
and S23, the negative voltage circuit is started to control the performance enhancement of the photodiode.
As a further improvement of the present invention, the voltage conversion module includes an I/V conversion module and a signal amplification module, and the step S3 specifically includes:
s31, the I/V conversion module receives the current signal transmitted by the receiving component and converts the current signal into a voltage signal;
s32, decoding the voltage signal by a digital-to-analog conversion module in the control assembly;
s33, if the voltage signal can be decoded by the digital-to-analog conversion module, the digital-to-analog conversion module directly outputs a decoding result; if the digital-to-analog conversion module cannot decode the voltage signal, the digital-to-analog conversion module transmits the voltage signal to the control assembly for control processing and forms a control signal and an evaluation value.
As a further improvement of the present invention, the voltage conversion module includes an I/V conversion module and a signal amplification module, the control module includes a digital-to-analog conversion module and a signal processing module, and the digital-to-analog conversion module includes a first conversion module and a second conversion module, at this time, step S33 further includes:
s331, the first conversion module and the second conversion module decode the voltage signal V at the same time;
s332, if the voltage signal can be decoded by the second conversion module, the second conversion module directly outputs a decoding result;
s333, if the second conversion module cannot decode the voltage signal, the signal amplification module amplifies the voltage signal and transmits the amplified voltage signal to the first conversion module for decoding again;
s334, if the amplified voltage signal can be decoded by the first conversion module, the first conversion module directly outputs a decoding result; if the first conversion module cannot decode the amplified voltage signal, the first conversion module transmits the voltage signal to the signal processing module for control processing and forms a control signal and an evaluation value.
As a further improvement of the present invention, the control component includes a digital-to-analog conversion module and a signal processing module, and the step S4 is specifically;
s41, decoding the voltage signal by a digital-to-analog conversion module in the control assembly;
s42, if the voltage signal can be decoded by the digital-to-analog conversion module, the digital-to-analog conversion module directly outputs a decoding result; and if the digital-to-analog conversion module cannot decode the voltage signal, the digital-to-analog conversion module transmits the voltage signal to a signal processing module in the control assembly for control processing, and a control signal and an evaluation value are formed.
The invention has the beneficial effects that: the invention improves the sensitivity and the accuracy of the scanning decoding system to the bar code identification by arranging the adjusting component capable of improving the performance of the receiving component and the signal amplification module for amplifying the voltage signal of the I/V conversion module in a multi-stage simultaneous/step processing mode; meanwhile, the structure of the light source component enables the scanning decoding system to successfully decode under various ambient lights; the problem of decoding failure caused by the material of the bar code printing position and reflection is avoided.
Drawings
FIG. 1 is a block diagram of a scan decoding system according to a preferred embodiment of the present invention.
FIG. 2 is a block diagram of a scanning decoding system according to another preferred embodiment of the present invention.
Fig. 3 is a flow chart diagram of the scan decoding method of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
It should be noted that, in order to avoid obscuring the present invention with unnecessary details, only the structures and/or processing steps closely related to the aspects of the present invention are shown in the drawings, and other details not closely related to the present invention are omitted.
In addition, it is also to be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a block diagram of a scanning decoding system 100 according to the present invention. The scanning decoding system 100 comprises a light source assembly 1, a receiving assembly 2, a voltage conversion assembly 3 and a control assembly 4, wherein the light source assembly 1 is used for emitting scanning light to the bar code, the receiving assembly 2 receives reflected light reflected by the bar code, the reflected light is converted by the voltage conversion assembly 3, and finally the control assembly 4 decodes the reflected light. The control assembly further comprises a signal processing module 42, wherein the signal processing module 42 is configured to generate a control signal and an evaluation value from the voltage signal V that cannot be decoded by the control assembly 4, and adjust the light source assembly 1, the receiving assembly 2 or the voltage converting assembly 3 according to the control signal and the evaluation value, so as to improve the accuracy of barcode identification.
The light source assembly 1 is used for emitting scanning light with a specific wavelength to a barcode to be scanned, and in a preferred embodiment of the present invention, the light source assembly 1 includes a light source body 11 and an adjustable member 12 electrically connected to the light source body 11. The adjustable component 12 is electrically connected to the control component 4, and the adjustable component 12 can adjust the output power of the light source body 11 under the control of the control component 4. With this arrangement, the scanning light irradiated on the barcode can be adjusted, and the intensity of the reflected light reflected by the barcode can be adjusted by adjusting the light intensity of the light source body 11.
In a preferred embodiment of the present invention, a light source wavelength adjusting device (not shown) is disposed inside the light source module 1, and the light source wavelength adjusting device is mainly used for fixing the wavelength of the formed scanning light within a specific wavelength range, so that the light source module 1 adjusts the wavelength of the light source according to different requirements. For example: in some application scenarios where visibility to the scanning light is desired, the wavelength of the scanning light can be adjusted to be within the visible wavelength range; in some application scenarios where it is desirable to be invisible to the scanning light, the wavelength of the scanning light can be adjusted to be within the range of infrared light wavelengths. As another example, in some particular scenarios, to exclude interference from light of 400nm-500nm wavelength, the wavelength of the scanned light may be adjusted outside of this wavelength range.
The receiving component 2 is used for receiving the reflected light reflected by the bar code to be scanned and converting the reflected light into a current signal I. The receiving component 2 comprises a photodiode 21 and an adjusting component 22, wherein the photodiode 21 is used for receiving a reflected light signal reflected by a bar code to be scanned and converting the reflected light signal into a current signal I; the adjustment assembly 22 is used to adjust the performance of the photodiode 21. The axes of the receiving assembly 2 and the light source assembly 1 in the horizontal direction are located on the same plane, so that the reflected light is received by the receiving assembly 2 to the maximum extent. In a preferred embodiment of the present invention, a filter (not shown) is disposed at the light receiving surface of the receiving component 2, and the filter can filter out the interference light according to the setting of the wavelength, so as to improve the accuracy of the scanning and decoding.
The adjusting component 22 is electrically connected to the control component 4 and the photodiode 21, and includes a determining module 221, a negative voltage circuit 222 electrically connected to the determining module 221, and a feedback module 223 connected between the negative voltage circuit 222 and the determining module 221. The determining module 221 is electrically connected to the control component 4, and is configured to receive the control signal and the evaluation value fed back by the signal processing module 42, so as to control the opening of the negative voltage circuit 222.
The negative voltage circuit 222 is electrically connected to the determining module 221 and the receiving module 2, respectively, and is configured to apply a reverse voltage to the photodiode 21, so as to improve the performance of the photodiode 21. Specifically, due to the electrical characteristics of the photodiode 21, the body of the photodiode will generate a parasitic capacitance Cs during production and manufacturing, and at the same time, the junction capacitance Cj will be generated at the PN junction as with all diodes, and the terminal capacitance Ca formed by the superposition of these two capacitances will affect the response speed of the photodiode 21 during the operation of the photodiode 21. The influence of the terminal capacitor Ca is mainly reflected in that the current generated by reflecting the reflected light to the photodiode 21 needs to be charged before the subsequent current is output to the outside, thereby seriously influencing the response efficiency and response sensitivity of the output signal of the photodiode 21. When the terminal capacitor Ca of the photodiode 21 itself is designed to be large or the reflected light is weak, the small current generated on the photodiode 21 may be completely absorbed by the terminal capacitor Ca and cannot be output, thereby causing the scan decoding system 100 to be unable to be used normally or to generate decoding errors. Therefore, in the present invention, the photodiode 21 is charged by applying a negative voltage to the terminal capacitor Ca, so as to improve the performance of the photodiode 21 and improve the response rate of the photodiode 21 to a small current.
The feedback module 223 is electrically connected to the negative voltage circuit 222 and the determining module 221, respectively, and is configured to monitor the voltage value actually output by the negative voltage circuit 222 in real time, and feed back the voltage value actually output by the negative voltage circuit 222 to the determining module 221, and the determining module 221 controls the output target voltage through the feedback device parameter of the negative voltage circuit 222, so as to meet the minimum requirement of the photodiode 21 on the current output. It should be noted that, in order to reduce the terminal capacitance Ca in the device of the photodiode 21, it is feasible to apply a proper reverse voltage to the photodiode 21 to reduce the terminal capacitance Ca, thereby improving the timeliness of the signal output of the photodiode 21, and certainly, the amplitude of the reverse voltage applied to the photodiode 21 needs to reasonably meet the application requirement, and cannot be too high to break down the photodiode 21, that is, in the present invention, although the reverse voltage value of the negative voltage circuit 222 is not limited, it needs to be ensured that the reverse voltage value provided by the negative voltage circuit 222 meets the above requirement.
The voltage conversion component 3 is electrically connected with the receiving component 2, and is used for receiving the current signal I and converting the current signal I into a voltage signal V. The voltage conversion assembly 3 comprises an I/V conversion module 31 and a signal amplification module 32 which are connected in sequence, the I/V conversion module 31 is used for converting the current signal I acquired by the receiving assembly 2 into a voltage signal V with a certain pulse width, and the signal amplification module 32 is used for performing multiple amplification on the converted voltage signal V.
The control component 4 is electrically connected with the receiving component 2 and is used for decoding or feeding back the voltage signal V. The control assembly 4 comprises a digital-to-analog conversion module 41 and a signal processing module 42 which are connected in sequence. The digital-to-analog conversion module 41 is electrically connected to the voltage conversion module 3, and is configured to decode and output the voltage signal V. Preferably, the digital-to-analog conversion module 41 may be an ADC analog-to-digital converter.
The signal processing module 42 is configured to perform control processing on the voltage signal V that cannot be identified by the digital-to-analog conversion module 41, and finally form a control signal and an evaluation value. It should be noted that the evaluation value is a preferable adjustment value for ensuring that the scanning decoding system 100 does not damage the device and reduces the power consumption while successfully decoding; that is, the evaluation value is a difference between the minimum voltage value that the digital-to-analog conversion module 41 can recognize and the voltage value that the actual digital-to-analog conversion module 41 cannot recognize. Generation of evaluation value:
firstly, when the digital-to-analog conversion module 41 cannot identify the voltage signal V, the waveform of the voltage signal V is converted from the time domain to the frequency domain by applying FFT (fast fourier transform) algorithm operation;
secondly, optimizing the waveform of the voltage signal V, and performing FFT inverse transformation on the optimized waveform of the voltage signal V to obtain the waveform of the voltage signal V after the signal-to-noise ratio is optimized;
then, comparing and evaluating the voltage signal V waveform after the signal-to-noise ratio optimization with the voltage signal V waveform which can be successfully decoded; specifically, the best and worst area of the barcode contrast, the start and end positions of the barcode, and the suspected light reflection area are identified mainly according to the specification of the width-to-width ratio of the barcode, thereby generating a preliminary evaluation value.
Finally, the amplitude difference between the wide bar and the narrow bar of the bar code is identified, and a final evaluation value is generated.
The voltage signal V waveform optimization means comprises:
preferably, high-frequency and low-frequency noise in the voltage signal V waveform is filtered, and 1 KHz-20 KHz frequency band signals where the effective information of the bar code to be identified is located are reserved. Meanwhile, since fixed interference noise is generated in the frequency band, some typical frequency points need to be specifically suppressed, and the fixed interference noise is filtered out to complete filtering of a frequency domain. It should be noted that, the typical frequency points in the present invention include conventional signal frequency points, and further include specific signal frequency points obtained by self-learning after the scanning and decoding system 100 is used for multiple times, so that the optimization of the signal processing module 42 on the voltage signal V waveform can be effectively promoted, and the identification and decoding of the digital-to-analog conversion module 41 are facilitated.
Preferably, whether the waveform of the generated voltage signal V has a certain frequency variation is determined, and if yes, the received voltage signal V generated for the scanning light is determined to be received; and conversely, generating a voltage signal V for the interference light in the environment.
Preferably, the lower limit trend analysis of the voltage signal V waveform is performed to remove the dc component in the voltage signal V waveform. The dc component of the voltage signal V waveform is usually caused by signal fluctuations due to uneven printing and smearing of the scanned bar code, ambient light noise, and significant reflected light intensity differences due to different reflectivities of narrow wavelength lasers by materials of different colors and textures.
Preferably, the peak trend analysis of the voltage signal V waveform is performed to filter out abnormal peaks. The abnormal peak in the waveform of the voltage signal V is usually caused by the interference signal introduced by the reflection of light by the material.
The signal processing module 42 is electrically connected to the adjustable component 12, and the signal processing module 42 feeds back a control signal to the adjustable component 12, so as to control the adjustable component 12 to adjust. Meanwhile, in order to effectively control the adjustment strength of the adjustable member 12, the signal processing module 42 feeds back the evaluation value to the adjustable member 12. The signal processing module 42 is electrically connected to the signal amplifying module 32, and the signal processing module 42 feeds back the control signal to the signal amplifying module 32, so as to control the signal amplifying module 32 to adjust. Meanwhile, in order to effectively control the adjustment strength of the signal amplification module 32, the signal processing module 42 feeds back the evaluation value to the signal amplification module 32. The signal processing module 42 is electrically connected to the adjusting component 22, and the signal processing module 42 feeds back the control signal and the evaluation value to the determining module 221 in the adjusting component 22, so as to control the determining module 221 to turn on the negative pressure circuit 222.
Please refer to fig. 2, which is a block diagram illustrating another scan decoding system 200 according to the present invention. The scan decoding system 200 also includes a light source module 1, a receiving module 2, a voltage converting module 3 ', and a control module 4', and the scan decoding system 200 is different from the scan decoding system 100 only in the voltage converting module 3 'and the control module 4', and the following description will be described with respect to the differences between the scan decoding system 200 and the scan decoding system 100, and the same or similar parts will not be repeated herein.
In this embodiment, the voltage conversion module 3 'includes a signal amplification module 32' electrically connected to the I/V conversion module 31 'and the I/V conversion module 31', and the signal amplification module 32 'is electrically connected to the I/V conversion module 31' and the digital-to-analog conversion module 41 ', respectively, for performing multiple amplification on the voltage signal V converted by the I/V conversion module 31'.
Further, the digital-to-analog conversion module 41 ' in this embodiment includes a first conversion module 411 ' and a second conversion module 412 ', the first conversion module 411 ' is electrically connected to the signal amplification module 32 ' and the signal processing module 42 ', respectively, and further electrically connected to the I/V conversion module 31 ' through the signal amplification module 32 ', and the signal amplification module 32 ' can amplify the voltage signal V output by the I/V conversion module 31 ', so as to facilitate the first conversion module 411 ' to analyze the voltage signal V; the second conversion module 412 'is directly electrically connected to the I/V conversion module 31'.
In particular, the voltage signal V delivered by the I/V conversion module 31 'is susceptible to the current signal I delivered by the receiving component 2, so that the voltage signal V is not easily received or decoded by the digital-to-analog conversion module 41'. In the present embodiment, the first conversion module 411 ' and the second conversion module 412 ' can decode the voltage signal V delivered by the I/V conversion module 31 ' at the same time. In particular, when the voltage signal V output by the I/V conversion module 31 'is small, the voltage signal V cannot be decoded by the second conversion module 412'; the voltage signal V output from the I/V conversion module 31 'may be amplified by the signal amplification module 32' and the voltage signal V amplified by the signal amplification module 32 'may be decoded by the first conversion module 411'. When the voltage signal V outputted from the I/V conversion module 31 ' is large enough, the voltage signal V can be directly decoded by the second conversion module 412 ', and the signal amplification module 32 ' does not need to amplify the voltage signal V.
Further, when the voltage signal V still cannot be decoded by the first conversion module 411 ' after being amplified by the signal amplification module 32 ', the signal processing module 42 ' identifies the voltage signal V to obtain the control signal and the evaluation value for further processing, which is not described herein again. That is, in this embodiment, the scan decoding system 200 increases the amplification adjustment manner of the voltage signal V, so that the scan decoding system 200 can further identify the barcode conveniently, and the first conversion module 321 'and the second conversion module 322' operate simultaneously, so that the barcode identification speed and the barcode identification accuracy of the scan decoding system 200 can be effectively improved.
Referring to fig. 3, the present invention further provides a scanning decoding method, including the following steps:
s1, the light source component 1 emits scanning light to the bar code to be decoded;
s2, the receiving component 2 receives the reflected light reflected by the bar code to be decoded and converts the reflected light signal into a current signal I;
s3, the voltage conversion component 3 receives the current signal I transmitted by the receiving component 2 and converts the current signal I into a voltage signal V;
s4, the control component 4 identifies the voltage signal V, and if the voltage signal V can be identified, the control component 4 directly outputs a decoding result; if the control unit 4 cannot recognize the voltage signal V, the control unit 4 controls the receiving unit 2 to perform performance enhancement and repeatedly perform steps S1 to S4 until a decoding result is output.
The following description will be made in detail with respect to steps S1 to S4.
Step S1 specifically includes: the light source assembly 1 is electrically driven to emit scanning light having a specific wavelength and irradiates a barcode.
Step S2 specifically includes:
s21, the photodiode 21 receives a reflected light signal reflected by the bar code to be decoded and converts the reflected light signal into a current signal I;
s22, the adjusting component 22 receives the control signal and the evaluation value of the control component 4 to control the opening or closing of the negative pressure circuit 222 in the adjusting component 22;
s23, the negative voltage circuit 222 is turned on, and the performance of the control photodiode 21 is enhanced.
Step S3 specifically includes:
s31, the I/V conversion module 31 receives the current signal I transmitted by the receiving component 2, and converts the current signal I into a voltage signal V;
s32, the digital-to-analog conversion module 41 in the control component 4 decodes the voltage signal V;
s33, if the voltage signal V can be decoded by the digital-to-analog conversion module 41, the digital-to-analog conversion module 41 directly outputs the decoding result; if the digital-to-analog conversion module 41 cannot decode the voltage signal V, the digital-to-analog conversion module 41 transmits the voltage signal V to the signal processing module 42 in the control component 4 for control processing and forming a control signal and an evaluation value.
Step S4 specifically includes;
s41, the digital-to-analog conversion module 41 in the control component 4 decodes the voltage signal V;
s42, if the voltage signal V can be decoded by the digital-to-analog conversion module 41, the digital-to-analog conversion module 41 directly outputs the decoding result; if the digital-to-analog conversion module 41 cannot decode the voltage signal V, the digital-to-analog conversion module 41 transmits the voltage signal V to the signal processing module 42 for control processing and forming a control signal and an evaluation value.
In a preferred embodiment of the present invention, the voltage conversion assembly 3 includes an I/V conversion module 31 'and a signal amplification module 32', the control module 4 'includes a digital-to-analog conversion module 41' and a signal processing module 42 ', and the digital-to-analog conversion module 41' includes a first conversion module 411 'and a second conversion module 412', in which case, step S33 further includes:
s331, the digital-to-analog conversion module 41 ' (including the first conversion module 411 ' and the second conversion module 412 ') decodes the voltage signal V at the same time;
s332, if the voltage signal V can be decoded by the second conversion module 322 ', the second conversion module 412' directly outputs the decoding result;
s333, if the second conversion module 322 ' cannot decode the voltage signal V, the signal amplification module 32 ' amplifies the voltage signal V and transmits the amplified voltage signal V to the first conversion module 411 ' for decoding again;
s334, if the amplified voltage signal V can be decoded by the first conversion module 411 ', the first conversion module 411' directly outputs a decoding result; if the first conversion module 411 ' cannot decode the amplified voltage signal V, the first conversion module 411 ' transfers the voltage signal V to the signal processing module 42 ' for control processing and forming a control signal and an evaluation value.
In summary, the scanning decoding systems 100 and 200 of the present invention improve the performance of the interfacing photodiode 21 by the adjusting component 22, and improve the sensitivity and accuracy of the scanning decoding systems 100 and 200 for bar code identification by adopting a multi-stage simultaneous/step-by-step processing manner for the signal amplification modules 32 and 32 'that amplify the voltage signals V of the I/V conversion modules 31 and 31'; meanwhile, the structure of the light source assembly 1 is set up so that the scanning and decoding systems 100 and 200 can successfully decode under various ambient lights; the problem of decoding failure caused by the material of the bar code printing position and reflection is avoided.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the spirit and scope of the present invention.
Claims (15)
1. A scanning decoding system, comprising:
the light source component is used for emitting scanning light to the bar code to be scanned;
the receiving component is used for receiving the reflected light signal reflected by the bar code to be scanned and converting the reflected light signal into a current signal;
the voltage conversion assembly is electrically connected with the receiving assembly and is used for receiving the current signal and converting the current signal into a voltage signal;
the control component is electrically connected with the voltage conversion component and used for decoding the voltage signal;
the control assembly further comprises a signal processing module, wherein the signal processing module is used for generating a control signal and an evaluation value from the voltage signal which cannot be decoded by the control assembly, and adjusting the light source assembly, the receiving assembly or the voltage conversion assembly through the control signal and the evaluation value.
2. The scanning decoding system of claim 1, wherein: the evaluation value is an adjustment value, and the evaluation value is a difference value between a minimum voltage value which can be identified by the digital-to-analog conversion module and a voltage value which cannot be identified by the digital-to-analog conversion module actually.
3. The scanning decoding system of claim 1, wherein: the receiving assembly comprises a photodiode and an adjusting assembly, wherein the photodiode is used for receiving a reflected light signal reflected by a bar code to be scanned and converting the reflected light signal into a current signal; the adjusting component is used for adjusting the performance of the photodiode; and a light receiving surface of the receiving assembly is provided with a filtering device for filtering interference light.
4. The scanning decoding system of claim 3, wherein: the adjusting assembly is electrically connected with the control assembly and the photodiode respectively and comprises a judging module, a negative pressure circuit electrically connected with the judging module and a feedback module connected between the negative pressure circuit and the judging module.
5. The scanning decoding system of claim 4, wherein: the judging module is electrically connected with the control assembly and used for receiving the control signal and the evaluation value fed back by the signal processing module and controlling the opening of the negative pressure circuit.
6. The scanning decoding system of claim 4, wherein: the feedback module is electrically connected with the negative pressure circuit and the judgment module respectively and is used for monitoring the voltage value actually output by the negative pressure circuit in real time and feeding back the voltage value actually output by the negative pressure circuit to the judgment module.
7. The scanning decoding system of claim 1, wherein: the voltage conversion assembly is electrically connected with the receiving assembly and used for receiving the current signal and converting the current signal into a voltage signal, and the voltage conversion assembly comprises an I/V conversion module which is used for converting the current signal acquired by the receiving assembly into the voltage signal with a certain pulse width.
8. The scanning decoding system of claim 1, wherein: the voltage conversion assembly further comprises a signal amplification module electrically connected with the I/V conversion module, and the signal amplification module is used for performing multiple amplification on the voltage signal converted by the I/V conversion module.
9. The scanning decoding system of claim 1, wherein: the control assembly further comprises a digital-to-analog conversion module electrically connected with the signal processing module, and the digital-to-analog conversion module is electrically connected with the voltage conversion assembly so as to decode and output the voltage signal.
10. The scanning decoding system of claim 1, wherein: the light source assembly comprises a light source body and an adjustable component electrically connected with the light source body, the adjustable component is electrically connected with the control assembly, and the adjustable component can adjust the illumination intensity of the light source body under the control action of the control assembly; the light source component is internally provided with a light source wavelength adjustable device used for adjusting the wavelength of the scanning light.
11. A scan decoding method, comprising the steps of:
s1, the light source component emits scanning light to the bar code to be decoded;
s2, the receiving component receives the reflected light reflected by the bar code to be decoded and converts the reflected light signal into a current signal;
s3, the voltage conversion component receives the current signal transmitted by the receiving component and converts the current signal into a voltage signal;
s4, the control component identifies the voltage signal, and if the voltage signal can be identified, the control component directly outputs a decoding result; if the control component can not identify the voltage signal, the control component controls the receiving component to enhance the performance and repeatedly executes the steps S1-S4 until the decoding result is output.
12. The scan decoding method of claim 11, wherein: the receiving component includes a photodiode and an adjusting component, and the step S2 specifically includes:
s21, the photodiode receives the reflected light signal reflected by the bar code to be decoded and converts the reflected light signal into a current signal;
s22, the adjusting component receives the control signal and the evaluation value of the control component to control the opening or closing of the negative pressure circuit in the adjusting component;
and S23, the negative voltage circuit is started to control the performance enhancement of the photodiode.
13. The scan decoding method of claim 11, wherein: the voltage conversion assembly comprises an I/V conversion module and a signal amplification module, and the step S3 specifically comprises:
s31, the I/V conversion module receives the current signal transmitted by the receiving component and converts the current signal into a voltage signal;
s32, decoding the voltage signal by a digital-to-analog conversion module in the control assembly;
s33, if the voltage signal can be decoded by the digital-to-analog conversion module, the digital-to-analog conversion module directly outputs a decoding result; if the digital-to-analog conversion module cannot decode the voltage signal, the digital-to-analog conversion module transmits the voltage signal to the control assembly for control processing and forms a control signal and an evaluation value.
14. The scan decoding method of claim 13, wherein: the voltage conversion module includes an I/V conversion module and a signal amplification module, the control module includes a digital-to-analog conversion module and a signal processing module, and the digital-to-analog conversion module includes a first conversion module and a second conversion module, at this time, step S33 further includes:
s331, the first conversion module and the second conversion module decode the voltage signal V at the same time;
s332, if the voltage signal can be decoded by the second conversion module, the second conversion module directly outputs a decoding result;
s333, if the second conversion module cannot decode the voltage signal, the signal amplification module amplifies the voltage signal and transmits the amplified voltage signal to the first conversion module for decoding again;
s334, if the amplified voltage signal can be decoded by the first conversion module, the first conversion module directly outputs a decoding result; if the first conversion module cannot decode the amplified voltage signal, the first conversion module transmits the voltage signal to the signal processing module for control processing and forms a control signal and an evaluation value.
15. The scan decoding method of claim 11, wherein: the control component comprises a digital-to-analog conversion module and a signal processing module, and the step S4 is specifically;
s41, decoding the voltage signal by a digital-to-analog conversion module in the control assembly;
s42, if the voltage signal can be decoded by the digital-to-analog conversion module, the digital-to-analog conversion module directly outputs a decoding result; and if the digital-to-analog conversion module cannot decode the voltage signal, the digital-to-analog conversion module transmits the voltage signal to a signal processing module in the control assembly for control processing, and a control signal and an evaluation value are formed.
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