CN111368747A - System and method for realizing palm vein characteristic correction processing based on TOF technology - Google Patents
System and method for realizing palm vein characteristic correction processing based on TOF technology Download PDFInfo
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- CN111368747A CN111368747A CN202010150800.7A CN202010150800A CN111368747A CN 111368747 A CN111368747 A CN 111368747A CN 202010150800 A CN202010150800 A CN 202010150800A CN 111368747 A CN111368747 A CN 111368747A
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- 210000003462 vein Anatomy 0.000 title claims abstract description 108
- 238000012545 processing Methods 0.000 title claims abstract description 40
- 238000000034 method Methods 0.000 title claims abstract description 30
- 238000012937 correction Methods 0.000 title claims abstract description 25
- 230000003287 optical effect Effects 0.000 claims abstract description 26
- 238000001514 detection method Methods 0.000 claims abstract description 8
- 238000003333 near-infrared imaging Methods 0.000 claims abstract description 5
- 239000000284 extract Substances 0.000 claims description 4
- 230000007547 defect Effects 0.000 description 2
- 230000003542 behavioural effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 210000002615 epidermis Anatomy 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002366 time-of-flight method Methods 0.000 description 1
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- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
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- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V10/00—Arrangements for image or video recognition or understanding
- G06V10/10—Image acquisition
- G06V10/12—Details of acquisition arrangements; Constructional details thereof
- G06V10/14—Optical characteristics of the device performing the acquisition or on the illumination arrangements
- G06V10/145—Illumination specially adapted for pattern recognition, e.g. using gratings
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06V—IMAGE OR VIDEO RECOGNITION OR UNDERSTANDING
- G06V40/00—Recognition of biometric, human-related or animal-related patterns in image or video data
- G06V40/10—Human or animal bodies, e.g. vehicle occupants or pedestrians; Body parts, e.g. hands
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Abstract
The invention relates to a system for realizing palm vein characteristic correction processing based on TOF technology, which comprises a TOF ranging module, a time of flight (TOF) module and a time of flight (TOF) module, wherein the TOF ranging module is used for acquiring the detection distance of a target through a transmitted optical signal and a received reflected optical signal; the palm vein capturing module is used for shooting a digital image of the palm vein blood vessel through a near infrared imaging technology; and the data processing module is used for processing and comparing the palm vein images. The invention also relates to a palm vein characteristic correction method based on TOF. By adopting the system and the method for realizing palm vein characteristic correction processing based on the TOF technology, the palm position information of the user can be accurately acquired by using the TOF ranging, so that the user is free from the constraint of the palm, non-contact palm vein recognition is realized, the characteristics of cleanness, sanitation and the like are achieved, and the user acceptance is effectively improved. The method is different from other methods, the image is processed firstly, the palm vein features are extracted, and then correction and identification are carried out, so that the method is less in calculation amount, high in processing speed and more accurate in palm vein feature restoration.
Description
Technical Field
The invention relates to the field of traffic equipment, in particular to the field of palm vein recognition, and specifically relates to a system and a method for realizing palm vein feature correction processing based on TOF technology.
Background
Remote user authentication has become very common in today's society. The unreliability of an authentication system can cause immeasurable losses to a company or enterprise, especially for some remote authentication systems, where security issues are more pronounced. The traditional authentication has the defects of easy forgetting, loss, sharability and the like, and the reliability of the traditional authentication cannot be guaranteed. The biometric system performs verification by using physiological or behavioral characteristics of individual characteristics, avoids the hidden danger of conventional authentication, and biometric information is difficult to copy or share.
The palm vein of a human body is hidden under the epidermis and cannot be shot under visible light, but can be shot under near infrared light, the structure is complex and is difficult to copy, in addition, the palm needs to be stretched flat when the palm vein is shot, and the hand is in a half-fist state under a natural state, so that the palm vein cannot be stolen and shot, and the palm vein becomes a biological characteristic with high safety.
In the palm vein recognition system, the inclination of the palm can cause very big influence to the discernment precision, and most palm vein recognition appearance fix the palm through the mode of putting the support additional at present to reach the purpose of location palm. However, the method is contact type, and is not clean and sanitary enough when used by multiple persons, so that the user acceptance is not high. If the palm is not completely flush with the palm vein recognition device, the palm is difficult to correct.
TOF is an abbreviation of Time of Flight (TOF) technology, i.e. a sensor emits modulated near-infrared light, which is reflected after encountering an object, and the sensor converts the distance of the photographed scene by calculating the Time difference or phase difference between light emission and reflection to generate depth information.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a system and a method for realizing palm vein characteristic correction treatment based on TOF technology, which are clean and sanitary, simple and convenient to operate and wide in application range.
In order to achieve the above object, the system and method for realizing palm vein feature correction processing based on TOF technology of the present invention are as follows:
this system based on TOF technique realizes palm vein characteristic correction processing, its key feature be, the system include:
the TOF ranging module is used for acquiring the detection distance of the target through the transmitted optical signal and the received reflected optical signal;
the palm vein capturing module is connected with the TOF ranging module and used for shooting a digital image of the palm vein blood vessel through a near-infrared imaging technology;
and the data processing module is connected with the palm vein capturing module and used for processing and comparing the palm vein image.
Preferably, the TOF ranging module comprises:
the transmitting unit is connected with the palm vein capturing module and is used for transmitting optical signals to the palm;
the receiving unit is connected with the palm vein capturing module and used for receiving the optical signal reflected by the palm;
and the control unit is connected with the palm vein capturing module and used for controlling other units, calculating the phase difference between the optical signal transmitted by the transmitting unit and the optical signal received by the receiving unit, and acquiring the detection distance of the target object based on the phase difference.
Preferably, the data processing module processes the palm vein image, extracts the palm vein feature, and compares the palm vein feature with the palm vein feature in the database.
The palm vein feature correction method based on TOF by utilizing the system is mainly characterized by comprising the following steps:
(1) the TOF ranging module acquires palm distance information;
(2) judging whether the distance of at least one point is smaller than a set value, if so, continuing the step (3); otherwise, continuing the step (1);
(3) shooting a palm image to obtain palm vein characteristics and position information;
(4) the data processing module corrects the characteristics of the palm veins and calculates the similarity;
(5) judging whether the similarity is greater than a set value, if so, successfully identifying; otherwise, the identification fails.
Preferably, the step (3) specifically includes the following steps:
(3.1) the palm vein capturing module captures a palm image;
(3.2) extracting the palm vein features by the data processing module;
and (3.3) the TOF ranging module acquires the position information of the palm vein features.
Preferably, the step (4) specifically includes the following steps:
(4.1) correcting the palm vein characteristics by the data processing module;
and (4.2) comparing the corrected palm vein feature database, finding out the nearest sample number, and calculating the similarity.
By adopting the system and the method for realizing palm vein characteristic correction processing based on the TOF technology, the palm position information of the user can be accurately acquired by using the TOF ranging, so that the user is free from the constraint of the palm, non-contact palm vein recognition is realized, the characteristics of cleanness, sanitation and the like are achieved, and the user acceptance is effectively improved. The method is different from other methods, the palm vein features are extracted by processing the image, and then correction and identification are carried out, so that the method is less in calculation amount, high in processing speed and more accurate in palm vein feature restoration, palm vein feature correction can be realized while the constraint of the bracket is eliminated, and non-contact identification is realized.
Drawings
Fig. 1 is a schematic structural diagram of a system for implementing palm vein feature correction processing based on TOF technology according to the invention.
Fig. 2 is a flowchart of a palm vein feature correction method based on TOF according to the invention.
Detailed Description
In order to more clearly describe the technical contents of the present invention, the following further description is given in conjunction with specific embodiments.
The system for realizing palm vein characteristic correction treatment based on TOF technology comprises the following steps:
the TOF ranging module is used for acquiring the detection distance of the target through the transmitted optical signal and the received reflected optical signal;
the palm vein capturing module is connected with the TOF ranging module and used for shooting a digital image of the palm vein blood vessel through a near-infrared imaging technology;
and the data processing module is connected with the palm vein capturing module and used for processing and comparing the palm vein image.
As a preferred embodiment of the present invention, the TOF ranging module includes:
the transmitting unit is connected with the palm vein capturing module and is used for transmitting optical signals to the palm;
the receiving unit is connected with the palm vein capturing module and used for receiving the optical signal reflected by the palm;
and the control unit is connected with the palm vein capturing module and used for controlling other units, calculating the phase difference between the optical signal transmitted by the transmitting unit and the optical signal received by the receiving unit, and acquiring the detection distance of the target object based on the phase difference.
In a preferred embodiment of the present invention, the data processing module processes the palm vein image, extracts the palm vein feature, and compares the palm vein feature with the palm vein feature in the database.
The palm vein feature correction method based on TOF by utilizing the system comprises the following steps:
(1) the TOF ranging module acquires palm distance information;
(2) judging whether the distance of at least one point is smaller than a set value, if so, continuing the step (3); otherwise, continuing the step (1);
(3) shooting a palm image to obtain palm vein characteristics and position information;
(3.1) the palm vein capturing module captures a palm image;
(3.2) extracting the palm vein features by the data processing module;
(3.3) the TOF ranging module acquires position information of the palm vein features;
(4) the data processing module corrects the characteristics of the palm veins and calculates the similarity;
(4.1) correcting the palm vein characteristics by the data processing module;
(4.2) comparing the corrected palm vein feature database with the corrected palm vein feature database, finding out the nearest sample number, and calculating the similarity;
(5) judging whether the similarity is greater than a set value, if so, successfully identifying; otherwise, the identification fails.
In a specific embodiment of the present invention, the present invention provides a system for implementing palm vein feature correction processing based on TOF technology, which includes a TOF ranging module including a transmitting unit, a receiving unit, and a control unit; a palm vein capturing module: the palm vein imaging system is responsible for shooting and obtaining a clear palm vein image; a data processing module: and the palm vein image is processed and compared.
Specifically, TOF ranging systems: the transmitting unit is used for transmitting optical signals to the palm, the receiving unit is used for receiving the optical signals reflected back by the palm, the control unit is used for controlling the transmitting module to transmit the optical signals to the palm, controlling the receiving unit to receive the optical signals reflected back by the palm, calculating the phase difference between the optical signals transmitted by the transmitting unit and the optical signals received by the receiving unit, and acquiring the detection distance of the target object based on the phase difference. The palm vein capturing module is used for shooting a digital image of the palm vein blood vessel by utilizing a near infrared imaging technology. The data processing module processes the palm vein image shot by the palm vein capturing module, extracts the palm vein features, and then compares the extracted palm vein features with the palm vein features in the database.
By adopting the system and the method for realizing palm vein characteristic correction processing based on the TOF technology, the palm position information of the user can be accurately acquired by using the TOF ranging, so that the user is free from the constraint of the palm, non-contact palm vein recognition is realized, the characteristics of cleanness, sanitation and the like are achieved, and the user acceptance is effectively improved. The method is different from other methods, the image is processed firstly, the palm vein features are extracted, and then correction and identification are carried out, so that the method is less in calculation amount, high in processing speed and more accurate in palm vein feature restoration.
In this specification, the invention has been described with reference to specific embodiments thereof. It will, however, be evident that various modifications and changes may be made thereto without departing from the broader spirit and scope of the invention. The specification and drawings are, accordingly, to be regarded in an illustrative rather than a restrictive sense.
Claims (6)
1. A system for realizing palm vein characteristic correction treatment based on TOF technology is characterized by comprising:
the TOF ranging module is used for acquiring the detection distance of the target through the transmitted optical signal and the received reflected optical signal;
the palm vein capturing module is connected with the TOF ranging module and used for shooting a digital image of the palm vein blood vessel through a near-infrared imaging technology;
and the data processing module is connected with the palm vein capturing module and used for processing and comparing the palm vein image.
2. The system of claim 1, wherein the TOF ranging module comprises:
the transmitting unit is connected with the palm vein capturing module and is used for transmitting optical signals to the palm;
the receiving unit is connected with the palm vein capturing module and used for receiving the optical signal reflected by the palm;
and the control unit is connected with the palm vein capturing module and used for controlling other units, calculating the phase difference between the optical signal transmitted by the transmitting unit and the optical signal received by the receiving unit, and acquiring the detection distance of the target object based on the phase difference.
3. The system of claim 1, wherein the data processing module processes the palm vein image, extracts the palm vein feature, and compares the palm vein feature with the palm vein features in the database.
4. A method for implementing palm vein feature correction processing based on TOF technology by using the system of claim 1, wherein the method comprises the following steps:
(1) the TOF ranging module acquires palm distance information;
(2) judging whether the distance of at least one point is smaller than a set value, if so, continuing the step (3); otherwise, continuing the step (1);
(3) shooting a palm image to obtain palm vein characteristics and position information;
(4) the data processing module corrects the characteristics of the palm veins and calculates the similarity;
(5) judging whether the similarity is greater than a set value, if so, successfully identifying; otherwise, the identification fails.
5. The method for realizing palm vein feature correction processing based on TOF technology as claimed in claim 3, wherein said step (3) includes the following steps:
(3.1) the palm vein capturing module captures a palm image;
(3.2) extracting the palm vein features by the data processing module;
and (3.3) the TOF ranging module acquires the position information of the palm vein features.
6. The method for realizing palm vein feature correction processing based on TOF technology as claimed in claim 3, wherein said step (4) includes the following steps:
(4.1) correcting the palm vein characteristics by the data processing module;
and (4.2) comparing the corrected palm vein feature database, finding out the nearest sample number, and calculating the similarity.
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| CN202010150800.7A CN111368747A (en) | 2020-03-06 | 2020-03-06 | System and method for realizing palm vein characteristic correction processing based on TOF technology |
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Cited By (1)
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| CN113221891A (en) * | 2021-05-12 | 2021-08-06 | 佛山育脉科技有限公司 | Method and device for adjusting recognition angle of palm vein image |
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