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Method and device for collecting blood-vessel image under near infrared light

A technology of blood vessel images and near-infrared light, which is applied in human identification, character and pattern recognition, medical science, etc., can solve the problems of low image resolution and large difference in image resolution, improve resolution, avoid Comfort, avoiding the effects of application limitations

Active Publication Date: 2011-01-12
YANNAN GUOCHUANG TECH BEIJING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The object of the present invention is to provide a method and device for collecting blood vessel images irradiated by near-infrared light, so that the collected blood vessel images can effectively overcome the problem of low image resolution caused by the two phenomena described in the background technology
[0007] The invention adopts a plurality of infrared light sources to form a light-emitting array, and each light source emits a beam of parallel infrared light to illuminate different parts of the part to be collected, and solves the problem of large differences in image resolution by controlling the intensity of infrared rays emitted by each light source. question

Method used

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  • Method and device for collecting blood-vessel image under near infrared light
  • Method and device for collecting blood-vessel image under near infrared light
  • Method and device for collecting blood-vessel image under near infrared light

Examples

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Embodiment 1

[0034] In this embodiment, the following blood vessel image acquisition device is designed to collect blood vessel images of fingers:

[0035] The infrared light source in the infrared light generating unit is an infrared light-emitting diode with a center wavelength of 850 nanometers, 15 light-emitting diodes are arranged in a straight line, and the distance between two adjacent light-emitting diodes is 5.08 mm.

[0036] Control unit by ATMEL ATMEGA8 produced by the company Composed of a microcontroller and corresponding external circuits, the microcontroller controls each light-emitting diode through the IO port, and obtains control instructions from the corresponding port of the personal computer running the calculation program through the universal serial bus.

[0037] In this embodiment, the light intensity is controlled by means of pulse width modulation, that is, the driving signal applied to both ends of the infrared light-emitting diode is a fixed-frequency square ...

Embodiment 2

[0050] The present invention has designed another blood vessel image acquisition device for collecting blood vessel images of the palm and forearm, which is described as follows:

[0051] The light source in the infrared light generating unit also uses infrared light-emitting diodes with a center wavelength of 850 nanometers, arranged in a square array of 15×15, and the interval between adjacent rows and columns is 5.08 millimeters.

[0052] The control unit adopts ATMEL ATMEGA128 produced by the company Composed of a microcontroller and corresponding external circuits, the microcontroller controls each light-emitting diode through an IO port, and obtains control instructions through a universal serial bus port.

[0053] The information processing unit uses an Altera-based The embedded system of the company's Cyclone II FPGA video image solution sends control instructions to the control unit through the serial bus port.

[0054] This example is controlled by pulse freque...

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Abstract

The invention provides a method and a device for collecting a blood vessel image irradiated by near infrared light. A plurality of infrared light sources are adopted to form a luminous array; each light source gives out a beam of parallel infrared light which respectively illuminate the different parts of the position to be collected; the brightness and darkness of the current image are analyzed by using a computer program for automatically adjusting the light intensity of each light source; the blood vessel image after the changing of the light intensity of the light source is repeatedly collected for a plurality of times until an image meeting the requirements is collected, thereby solving the problem of larger difference between the resolving capability of parts of the images; besides,the invention can stably image without interference of external environmental light. The invention has an excellent market prospect, can effectively improve the recognition speed and the recognition rate as well as can reduce the mistaken recognition rate when the invention is applied to a biologic characteristic recognition device based on the blood vessel image and can obtain a top-grade image,improve the resolving capability and can reduce the error during checking when the invention is applied to medical inspection.

Description

technical field [0001] The invention belongs to the fields of biological feature recognition and infrared biological image acquisition, and in particular relates to a method and a device for acquiring blood vessel images under near-infrared light irradiation. Background technique [0002] Blood vessels can be distinguished in human tissue images acquired under near-infrared light irradiation, and are applied in biological identification and medical inspection. Chinese patents CN1472692A, CN1799063A, CN1564191A, and CN1586395A all describe a method and device for biometric identification through blood vessel images illuminated by infrared light. [0003] Since each person's skin, muscle tissue, and blood have different absorptivity and reflectivity of infrared light, when using the existing blood vessel image acquisition device to acquire blood vessel images, the average brightness of different people's blood vessel images, as well as the blood vessels and The contrast of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61B5/00A61B5/117G06K9/20A61B5/1171
Inventor 戴阳刚黄贝宁李文新许卓群
Owner YANNAN GUOCHUANG TECH BEIJING CO LTD
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