CN108363940B - Distance measurement control method and device applied to iris acquisition module - Google Patents
Distance measurement control method and device applied to iris acquisition module Download PDFInfo
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- CN108363940B CN108363940B CN201711285615.3A CN201711285615A CN108363940B CN 108363940 B CN108363940 B CN 108363940B CN 201711285615 A CN201711285615 A CN 201711285615A CN 108363940 B CN108363940 B CN 108363940B
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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
- G06V40/18—Eye characteristics, e.g. of the iris
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- G—PHYSICS
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- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C3/00—Measuring distances in line of sight; Optical rangefinders
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- 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
- G06V10/143—Sensing or illuminating at different wavelengths
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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
- G06V10/147—Details of sensors, e.g. sensor lenses
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Abstract
The invention relates to iris acquisition. The iris acquisition module measures distance by using infrared light emitted by an infrared distance measurement sensor, the iris acquisition module shoots an iris image of a human eye by using an iris image sensor, and in the process of shooting the iris image of the human eye by using the iris image sensor, infrared light emitted by the infrared distance measurement sensor is periodically switched between reaching the human eye and not reaching the human eye; therefore, the iris image of the human eye under the infrared light exists in the image obtained by the iris image sensor, and the iris image of the human eye under the infrared light exists or not. This patent provides the condition for iris image sensor obtains the people's eye iris image under the no infrared light. The distance measuring device applied to the iris acquisition module adopts a distance measuring control method applied to the iris acquisition module.
Description
Technical Field
The invention relates to the field of optical devices, in particular to iris acquisition.
Background
At present, a distance measuring module is used as one of core components of an iris image collector and is mainly used for measuring the distance between human eyes and a lens so as to guide a user to adjust the distance between the human eyes and the lens and ensure that a clear iris image is collected at a proper distance. At present, the distance measurement method of the distance measurement module mainly includes two kinds: one is a distance measurement method based on a hardware infrared distance measurement sensor, such as an iris distance measurement plate disclosed in patent CN103099624A, an iris recognition device for dynamic human eye tracking disclosed in patent CN106778713A, etc.; another is a distance measurement method based on software, for example, patent CN105654040A discloses a distance measurement method based on software, which calculates the distance between the lens and the eye according to the parameters such as the radius or diameter of the iris, the area of the image sensor, and the angle of view, etc. measured in the collected image on the premise that the diameters of the irises of different users are the same.
The first two patents based on hardware all use the infrared distance measuring sensor, but do not mention the influence of infrared light emitted by the sensor on an iris image during imaging, if the wavelength of the infrared light is 940nm, the infrared distance measuring sensor directly influences the iris image, and if the wavelength of the infrared light is 870nm, the generated scintillation light spot also influences the iris image, which is not beneficial to acquiring a high-quality clear image. The distance measurement method based on software has a problem that when the iris cannot be detected without clear imaging, the distance measurement cannot be completed, so that the distance measurement method has certain disadvantages.
Disclosure of Invention
The invention aims to provide a distance measurement control method applied to an iris acquisition module to solve the problem.
The invention aims to provide a distance measurement control device applied to an iris acquisition module, which is a distance measurement device adopting a distance measurement control method applied to the iris acquisition module.
The technical problem solved by the invention can be realized by adopting the following technical scheme:
a distance measurement control method applied to an iris acquisition module, the iris acquisition module measures distance by using infrared light emitted by an infrared distance measurement sensor, the iris acquisition module shoots an iris image of a human eye by using an iris image sensor,
the method is characterized in that in the process of shooting an iris image of a human eye by an iris image sensor, infrared light emitted by an infrared distance measuring sensor is periodically switched between reaching the human eye and not reaching the human eye;
therefore, the iris image of the human eye under the infrared light exists in the image obtained by the iris image sensor, and the iris image of the human eye under the infrared light exists or not.
The infrared ranging sensor of this patent sends infrared light is periodic switches between arriving people's eyes and can't reach people's eyes, because of infrared light part time can arrive people's eyes, so can carry out the range finding in this time, because of infrared light part time can not arrive people's eyes in addition, provides the condition for iris image sensor obtains people's eyes iris image under the no infrared light to the problem that iris image received the infrared light influence has been avoided.
The creativity of the patent lies not only in solving the problem proposed by the patent through such a simple method, but also in proposing the problem that the iris image is affected by infrared light.
The iris acquisition module uploads parameters for judging whether infrared light reaches human eyes and human iris images to an upper computer, the upper computer picks out the human iris images under the infrared light according to the existence of the infrared light reaching the human eyes, and the human iris images under the absence of the infrared light are reserved and used as images for subsequent processing.
The method for periodically switching the infrared light emitted by the infrared distance measuring sensor between reaching the human eyes and not reaching the human eyes can be as follows:
the method comprises the following steps: the infrared distance measuring sensor is periodically switched between a working state and a stopping state;
the second method comprises the following steps: the light-emitting light path of the infrared distance measuring sensor is periodically shielded.
In the first method, the infrared distance measuring sensor can be connected with a power supply module through a power supply control module, and the power supply control module is provided with a timing unit. The power supply control module controls power supply time through the timing unit and supplies power to the infrared distance measuring sensor periodically.
In the method, the power supply of the iris acquisition module by the power supply control module is used as a parameter for judging whether no infrared light reaches human eyes.
In the second method, the iris collecting module further comprises a driving motor, and a shielding piece capable of blocking infrared light emitted by the infrared distance measuring sensor is fixed on a rotating shaft of the driving motor. The driving motor drives the rotating shaft to rotate, so that the shielding piece on the rotating shaft is driven to rotate, and infrared light emitted by the infrared distance measuring sensor is periodically blocked.
In the method, the position of the shielding piece is used as a judgment parameter for no infrared light reaching human eyes by the iris acquisition module.
The wavelength of the infrared light emitted by the infrared distance measuring sensor is preferably 940 nm.
The distance measurement control method applied to the iris acquisition module is also provided with an infrared photosensitive sensor for monitoring ambient light, the external photosensitive sensor detects the ambient light with the wavelength of 450 nm-650 nm, and the iris acquisition module uploads the ambient light parameters detected by the external photosensitive sensor to an upper computer. And the upper computer adjusts the shooting parameters of the iris image sensor according to the environmental light parameters, including exposure time, analog gain and the like. The upper computer adjusts the brightness and contrast of the iris image according to the environmental light parameters so as to ensure that a clear high-quality iris image is acquired and can adapt to different environments for acquisition.
The utility model provides a be applied to range unit in iris collection module, includes an iris collection module, iris collection module includes a processor system, a processor system connects an iris image sensor who is used for gathering the iris image, processor system still connects an infrared distance measurement sensor who is used for measuring the distance between people's eye and the camera lens, a serial communication port, infrared distance measurement sensor connects a power module through a power control module, power control module is equipped with a timing unit. The power supply control module controls power supply time through the timing unit and supplies power to the infrared distance measuring sensor periodically. So that the infrared light emitted by the infrared distance measuring sensor is periodically switched between reaching the human eyes and not reaching the human eyes; therefore, the iris image of the human eye under the infrared light exists in the image obtained by the iris image sensor, and the iris image of the human eye under the infrared light exists or not.
The power supply control module can be directly connected with the upper computer and also can be connected with the processor system, and the power supply control module is connected with the upper computer through the processor system in a communication mode.
Another kind is applied to range unit in iris collection module, including an iris collection module, iris collection module includes a processor system, a processor system connects an iris image sensor who is used for gathering the iris image, a infrared distance measuring sensor who is used for measuring the distance between people's eye and the camera lens is still connected to the processor system, a serial communication port, iris collection module still includes a driving motor, be fixed with one in driving motor's the pivot and block the piece that shelters from of the infrared light that infrared distance measuring sensor sent. The driving motor drives the rotating shaft to rotate, so that the shielding piece on the rotating shaft is driven to rotate, and infrared light emitted by the infrared distance measuring sensor is periodically blocked. So that the infrared light emitted by the infrared distance measuring sensor is periodically switched between reaching the human eyes and not reaching the human eyes; therefore, the iris image of the human eye under the infrared light exists in the image obtained by the iris image sensor, and the iris image of the human eye under the infrared light exists or not.
The two distance measuring devices have similar relation of other components, and can adopt the following structures:
the iris acquisition module comprises a shell, and the infrared distance measuring sensor is fixed in the middle of the shell;
the device comprises two iris image sensors, wherein one iris image sensor is fixed on the right side of the infrared distance measuring sensor and used for collecting right-eye iris images, and the other iris image sensor is fixed on the left side of the infrared distance measuring sensor and used for collecting left-eye iris images;
and the two iris image sensors are respectively connected with the processor system.
This patent is equipped with two iris image sensor, can gather the iris image of both eyes, and in addition, this patent has optimized iris image sensor's position, makes the acquisition result more accurate.
The processor system is also connected with an infrared photosensitive sensor for monitoring ambient light, and an infrared photosensitive element of the infrared photosensitive sensor is fixed below the infrared distance measuring sensor. This patent has installed infrared photosensitive sensor additional on current synchronous collector of iris eyes, allows the treater system according to ambient light data, and the exposure time of iris image sensor, parameters such as analog gain can be controlled to the host processor, and clear high quality iris image is guaranteed to gather to the luminance and the contrast of the iris image that dynamic adjustment gathered.
The driving motor is preferably fixed on the side wall of the infrared distance measuring sensor, the length direction of the rotating shaft is the same as the infrared light emitting direction of the infrared distance measuring instrument, and the shielding piece is positioned in front of the light outlet of the infrared distance measuring sensor;
the shielding piece is preferably in a disc shape, a plurality of light-transmitting openings are formed in the shielding piece, and the plurality of light-transmitting openings are encircled into a ring shape by taking the central axis of the rotating shaft as the center;
the aperture of the light-transmitting opening is not smaller than the aperture of the light-emitting opening, and the minimum distance between two adjacent light-transmitting openings is not smaller than the aperture value of one light-transmitting opening;
the distance from the center of the light outlet to the rotating shaft is equal to the distance from the center of the light transmitting opening to the rotating shaft.
The shielding piece rotates under the drive of the rotating shaft, the light-transmitting openings sequentially reach the light-emitting openings, when the light-transmitting openings reach the light-emitting openings, the light emitted by the infrared distance measuring sensor is not shielded, and before the light reaches the light-emitting openings, the light emitted by the infrared distance measuring sensor is shielded.
The iris acquisition module comprises a shell, wherein a first opening is formed in the left side of the shell, a second opening is formed in the right side of the shell, the lens of the iris image sensor for the left eye is stretched out through the first opening, and the lens of the iris image sensor for the right eye is stretched out through the second opening. So that the lens is as far as possible aligned with the human eye.
A sliding groove is formed in the inner surface of the shell, and a sliding rail capable of sliding along the sliding groove is arranged behind the lens of the left-eye iris image sensor and the lens of the right-eye iris image sensor respectively;
the iris acquisition module also comprises a driving mechanism for driving the sliding rail to move on the sliding groove;
the first opening and the second opening are both long-strip-shaped openings. The sliding system has been add to this patent to the structure of trompil has been optimized, allows the camera lens horizontal slip, and the distance between adjustment two camera lenses equals or is close with shooter's interpupillary distance, thereby the most possible positive photo that obtains eyes.
The infrared distance measuring sensor comprises an infrared emitter and an infrared receiver, two light holes are formed in the shell, and the infrared emitter and the infrared receiver are respectively positioned behind one light hole;
and a light baffle is arranged between the infrared transmitter and the infrared receiver. So as to prevent the light emitted by the infrared emitter from directly entering the infrared receiver and influencing the detection precision.
A spherical cover body is arranged at the position of the light transmitting hole where the infrared receiver is located, the outer wall of the spherical cover body is smooth, and the inner wall of the spherical cover body is frosted. The spherical cover body has been add to this patent, can effectively increase and add the plain area, improves and detects the precision, in addition, still chooses interior dull polish, outer glossy material for use, and the light diffusion degree in the multiplicable printing opacity cover makes the interior light intensity of cover more even, can further improve and detect the precision.
The processor system is fixed within the housing, preferably below the housing. To improve the weight layout of the apparatus and to shift the center of gravity toward the lower middle.
An infrared filter is arranged at the light inlet end of the lens. The infrared filter is preferably optical glass plated with an infrared filter membrane. The infrared filter has a high transmittance for infrared light and a high reflectance for visible light.
Drawings
FIG. 1 is a schematic partial structure diagram of a distance measuring device in accordance with embodiment 1;
fig. 2 is a partial structural schematic diagram of a distance measuring device in embodiment 2.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific drawings.
A distance measurement control method applied to an iris acquisition module is characterized in that the iris acquisition module measures distance by using infrared light emitted by an infrared distance measurement sensor, the iris acquisition module shoots an iris image of a human eye by using an iris image sensor, and in the process of shooting the iris image of the human eye by using the iris image sensor, infrared light emitted by the infrared distance measurement sensor is periodically switched between reaching the human eye and not reaching the human eye; therefore, the iris image of the human eye under the infrared light exists in the image obtained by the iris image sensor, and the iris image of the human eye under the infrared light exists or not. The infrared ranging sensor of this patent sends infrared light is periodic switches between arriving people's eyes and can't reach people's eyes, because of infrared light part time can arrive people's eyes, so can carry out the range finding in this time, because of infrared light part time can not arrive people's eyes in addition, provides the condition for iris image sensor obtains people's eyes iris image under the no infrared light to the problem that iris image received the infrared light influence has been avoided.
The iris acquisition module uploads parameters for judging whether infrared light reaches human eyes and human iris images to an upper computer, the upper computer picks out the human iris images under the infrared light according to the existence of the infrared light reaching the human eyes, and the human iris images under the absence of the infrared light are reserved and used as images for subsequent processing.
The method for periodically switching the infrared light emitted by the infrared distance measuring sensor between reaching the human eyes and not reaching the human eyes can be as follows:
the method comprises the following steps: the infrared distance measuring sensor is periodically switched between a working state and a stopping state; the second method comprises the following steps: the light-emitting light path of the infrared distance measuring sensor is periodically shielded.
In the first method, the infrared distance measuring sensor can be connected with a power supply module through a power supply control module, and the power supply control module is provided with a timing unit. The power supply control module controls power supply time through the timing unit and supplies power to the infrared distance measuring sensor periodically. In the method, the power supply of the iris acquisition module by the power supply control module is used as a parameter for judging whether no infrared light reaches human eyes.
In the second method, the iris collecting module further comprises a driving motor, and a shielding piece capable of blocking infrared light emitted by the infrared distance measuring sensor is fixed on a rotating shaft of the driving motor. The driving motor drives the rotating shaft to rotate, so that the shielding piece on the rotating shaft is driven to rotate, and infrared light emitted by the infrared distance measuring sensor is periodically blocked. In the method, the position of the shielding piece is used as a judgment parameter for no infrared light reaching human eyes by the iris acquisition module.
The distance measurement control method applied to the iris acquisition module is also provided with an infrared photosensitive sensor for monitoring ambient light, the external photosensitive sensor detects the ambient light with the wavelength of 450 nm-650 nm, and the iris acquisition module uploads the ambient light parameters detected by the external photosensitive sensor to an upper computer. And the upper computer adjusts the shooting parameters of the iris image sensor according to the environmental light parameters, including exposure time, analog gain and the like. The upper computer adjusts the brightness and contrast of the iris image according to the environmental light parameters so as to ensure that a clear high-quality iris image is acquired and can adapt to different environments for acquisition. The wavelength of the infrared light emitted by the infrared distance measuring sensor is preferably 940 nm.
Detailed description of the preferred embodiment 1
Referring to fig. 1, a be applied to range unit among iris collection module, including an iris collection module, iris collection module includes a processor system, and a processor system connects an iris image sensor 1 that is used for gathering the iris image, and processor system still connects an infrared distance measurement sensor who is used for measuring the distance between people's eye and the camera lens, and infrared distance measurement sensor 2 is connected a power module through a power supply control module, and the power supply control module is equipped with a timing unit. The power supply control module controls power supply time through the timing unit and supplies power to the infrared distance measuring sensor 2 periodically. So that the infrared light emitted by the infrared distance measuring sensor 2 is periodically switched between reaching the human eyes and not reaching the human eyes; thus, the iris image sensor 1 can obtain an iris image of the human eye under infrared light and an iris image of the human eye under no infrared light. The power supply control module can be directly connected with the upper computer, can also be connected with the processor system, and is connected with the upper computer through the processor system in a communication mode. And the power supply control module switches the power supply state at least once every 2 seconds.
The iris acquisition module comprises a shell, and an infrared distance measuring sensor 2 is fixed in the middle of the shell; the number of the iris image sensors 1 is two, wherein one iris image sensor is fixed on the right side of the infrared distance measuring sensor 2 and used for collecting right eye iris images, and the other iris image sensor is fixed on the left side of the infrared distance measuring sensor 2 and used for collecting left eye iris images; the two iris image sensors are respectively connected with the processor system. This patent is equipped with two iris image sensor, can gather the iris image of both eyes, and in addition, this patent has optimized iris image sensor's position, makes the acquisition result more accurate.
The processor system is also connected with an infrared photosensitive sensor for monitoring ambient light, and an infrared photosensitive element 3 of the infrared photosensitive sensor is fixed below the infrared distance measuring sensor 2. This patent has installed infrared photosensitive sensor additional on current synchronous collector of iris eyes, allows the treater system according to ambient light data, and the exposure time of iris image sensor, parameters such as analog gain can be controlled to the host processor, and clear high quality iris image is guaranteed to gather to the luminance and the contrast of the iris image that dynamic adjustment gathered.
The left side of the shell is provided with a first opening, the right side of the shell is provided with a second opening, the lens of the iris image sensor for the left eye extends out of the first opening, and the lens of the iris image sensor for the right eye extends out of the second opening. So that the lens is as far as possible aligned with the human eye.
A sliding groove is arranged on the inner surface of the shell, and a sliding rail capable of sliding along the sliding groove is respectively arranged behind the lens of the left-eye iris image sensor and the lens of the right-eye iris image sensor; the iris acquisition module also comprises a driving mechanism for driving the sliding rail to move on the sliding groove; the first opening and the second opening are both long-strip-shaped openings. The sliding system has been add to this patent to the structure of trompil has been optimized, allows the camera lens horizontal slip, and the distance between adjustment two camera lenses equals or is close with shooter's interpupillary distance, thereby the most possible positive photo that obtains eyes.
The infrared distance measuring sensor 2 comprises an infrared emitter and an infrared receiver, two light holes are formed in the shell, and the infrared emitter and the infrared receiver are respectively positioned behind one light hole; and a light baffle is arranged between the infrared transmitter and the infrared receiver. So as to prevent the light emitted by the infrared emitter from directly entering the infrared receiver and influencing the detection precision.
A spherical cover body is arranged at the position of the light transmitting hole where the infrared receiver is located, the outer wall of the spherical cover body is smooth, and the inner wall of the spherical cover body is frosted. The spherical cover body has been add to this patent, can effectively increase and add the plain area, improves and detects the precision, in addition, still chooses interior dull polish, outer glossy material for use, and the light diffusion degree in the multiplicable printing opacity cover makes the interior light intensity of cover more even, can further improve and detect the precision. The processor system is fixed within the housing, preferably below the housing. To improve the weight layout of the apparatus and to shift the center of gravity toward the lower middle. The light inlet end of the lens is provided with an infrared filter. The infrared filter is preferably an optical glass plated with an infrared filter film. The infrared filter has a high transmittance for infrared light and a high reflectance for visible light.
Specific example 2
Referring to fig. 2, another distance measuring device applied to an iris collecting module comprises an iris collecting module, the iris collecting module comprises a processor system, the processor system is connected with an iris image sensor 1 for collecting an iris image, the processor system is further connected with an infrared distance measuring sensor 2 for measuring the distance between the human eye and the lens, the iris collecting module further comprises a driving motor, and a shielding piece 5 capable of blocking infrared light emitted by the infrared distance measuring sensor 2 is fixed on a rotating shaft 4 of the driving motor. The driving motor drives the rotating shaft 4 to rotate, so that the shielding piece on the rotating shaft is driven to rotate, and the infrared light emitted by the infrared distance measuring sensor 2 is periodically blocked. So that the infrared light emitted by the infrared distance measuring sensor 2 is periodically switched between reaching the human eyes and not reaching the human eyes; thus, the iris image sensor 1 can obtain an iris image of the human eye under infrared light and an iris image of the human eye under no infrared light.
The iris acquisition module comprises a shell, and an infrared distance measuring sensor 2 is fixed in the middle of the shell; the number of the iris image sensors 1 is two, wherein one iris image sensor is fixed on the right side of the infrared distance measuring sensor 2 and used for collecting right eye iris images, and the other iris image sensor is fixed on the left side of the infrared distance measuring sensor 2 and used for collecting left eye iris images; the two iris image sensors are respectively connected with the processor system. This patent is equipped with two iris image sensor, can gather the iris image of both eyes, and in addition, this patent has optimized iris image sensor's position, makes the acquisition result more accurate.
The processor system is also connected with an infrared photosensitive sensor for monitoring ambient light, and an infrared photosensitive element 3 of the infrared photosensitive sensor is fixed below the infrared distance measuring sensor 2. This patent has installed infrared photosensitive sensor additional on current synchronous collector of iris eyes, allows the treater system according to ambient light data, and the exposure time of iris image sensor, parameters such as analog gain can be controlled to the host processor, and clear high quality iris image is guaranteed to gather to the luminance and the contrast of the iris image that dynamic adjustment gathered.
The driving motor is preferably fixed on the side wall of the infrared distance measuring sensor 2, the length direction of the rotating shaft 4 is the same as the infrared light emitting direction of the infrared distance measuring instrument, and the shielding piece 5 is positioned in front of the light outlet of the infrared distance measuring sensor 2; the shielding piece is preferably in a disc shape, a plurality of light-transmitting openings are formed in the shielding piece, and the plurality of light-transmitting openings are encircled into a ring shape by taking the central axis of the rotating shaft as the center; the aperture of each light-transmitting opening is not smaller than the aperture of each light-emitting opening, and the minimum distance between every two adjacent light-transmitting openings is not smaller than the aperture value of one light-transmitting opening; the distance from the center of the light outlet to the rotating shaft is equal to the distance from the center of the light transmitting opening to the rotating shaft. The shielding piece rotates under the drive of the rotating shaft, the light-transmitting openings sequentially reach the light-emitting openings, when the light-transmitting openings reach the light-emitting openings, the light emitted by the infrared distance measuring sensor is not shielded, and before the light reaches the light-emitting openings, the light emitted by the infrared distance measuring sensor is shielded. The rotating speed of the driving motor is at least 1 revolution per 2 seconds, and the number of the light-transmitting openings on the shielding piece is two. There are 2 light-transmitting openings in fig. 2.
The left side of the shell is provided with a first opening, the right side of the shell is provided with a second opening, and the lens of the left iris image sensor extends out of the first opening. So that the lens is as far as possible aligned with the human eye.
A sliding groove is arranged on the inner surface of the shell, and a sliding rail capable of sliding along the sliding groove is respectively arranged behind the lens of the left-eye iris image sensor and the lens of the right-eye iris image sensor; the iris acquisition module also comprises a driving mechanism for driving the sliding rail to move on the sliding groove; the first opening and the second opening are both long-strip-shaped openings. The sliding system has been add to this patent to the structure of trompil has been optimized, allows the camera lens horizontal slip, and the distance between adjustment two camera lenses equals or is close with shooter's interpupillary distance, thereby the most possible positive photo that obtains eyes.
The infrared distance measuring sensor comprises an infrared emitter and an infrared receiver, two light holes are formed in the shell, and the infrared emitter and the infrared receiver are respectively positioned behind one light hole; and a light baffle is arranged between the infrared transmitter and the infrared receiver. So as to prevent the light emitted by the infrared emitter from directly entering the infrared receiver and influencing the detection precision. A spherical cover body is arranged at the position of the light transmitting hole where the infrared receiver is located, the outer wall of the spherical cover body is smooth, and the inner wall of the spherical cover body is frosted. The spherical cover body has been add to this patent, can effectively increase and add the plain area, improves and detects the precision, in addition, still chooses interior dull polish, outer glossy material for use, and the light diffusion degree in the multiplicable printing opacity cover makes the interior light intensity of cover more even, can further improve and detect the precision. The processor system is fixed within the housing, preferably below the housing. To improve the weight layout of the apparatus and to shift the center of gravity toward the lower middle. The light inlet end of the lens is provided with an infrared filter. The infrared filter is preferably an optical glass plated with an infrared filter film. The infrared filter has a high transmittance for infrared light and a high reflectance for visible light.
In the above two embodiments, the processor system may include a signal processing circuit, an 8-bit/16-bit analog-to-digital converter, the signal processing circuit is connected to the analog-to-digital converter, and the analog-to-digital converter is connected to the left-eye iris image sensor, the right-eye iris image sensor, the infrared distance measuring sensor, and the infrared photosensitive sensor. To enable communication of the modules with the signal processing circuitry. The signal processing circuit is also connected with a USB data transmission interface. And the iris acquisition module transmits the data to the host through the USB data transmission interface.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. A distance measurement control method applied to an iris acquisition module, the iris acquisition module measures distance by using infrared light emitted by an infrared distance measurement sensor, the iris acquisition module shoots an iris image of a human eye by using an iris image sensor,
the method is characterized in that in the process of shooting an iris image of a human eye by an iris image sensor, infrared light emitted by an infrared distance measuring sensor is periodically switched between reaching the human eye and not reaching the human eye; the infrared light part time can reach human eyes, distance measurement is carried out in the time, and the infrared light part time can not reach the human eyes, so that iris images of the human eyes under the condition of no infrared light are obtained in the time;
therefore, the iris image of the human eye under the infrared light exists in the image obtained by the iris image sensor, and the iris image of the human eye under the infrared light exists or not;
the iris acquisition module uploads parameters for judging whether infrared light reaches human eyes and an iris image of the human eyes to an upper computer, the upper computer picks out the iris image of the human eyes under the infrared light according to the fact that the infrared light reaches the human eyes, and the iris image of the human eyes under the infrared light is reserved and used as an image for subsequent processing;
the iris image sensors of the iris acquisition module are two, wherein one iris image sensor is fixed on the right side of the infrared distance measurement sensor and used for acquiring an iris image of a right eye, and the other iris image sensor is fixed on the left side of the infrared distance measurement sensor and used for acquiring an iris image of a left eye;
the distance between the two lenses is adjusted to be equal to or close to the interpupillary distance of the photographed person by sliding the lenses of the iris image sensor left and right, so that the front photos of the eyes are obtained.
2. A ranging control method applied to an iris acquisition module according to claim 1, wherein: the method for periodically switching the infrared light emitted by the infrared distance measuring sensor between reaching the human eyes and not reaching the human eyes is that the infrared distance measuring sensor is periodically switched between a working state and a stopping state;
the infrared distance measuring sensor is connected with a power supply module through a power supply control module, the power supply control module is provided with a timing unit,
the power supply control module controls power supply time through the timing unit and supplies power to the infrared distance measuring sensor periodically.
3. A ranging control method applied to an iris acquisition module according to claim 1, wherein: the method for periodically switching the infrared light emitted by the infrared distance measuring sensor between reaching the human eyes and not reaching the human eyes is that the light emitting path of the infrared distance measuring sensor is periodically shielded;
the iris acquisition module also comprises a driving motor, and a shielding piece capable of blocking infrared light emitted by the infrared distance measuring sensor is fixed on a rotating shaft of the driving motor;
the driving motor drives the rotating shaft to rotate, so that the shielding piece on the rotating shaft is driven to rotate, and infrared light emitted by the infrared distance measuring sensor is periodically blocked.
4. A distance measuring device applied to an iris acquisition module comprises the iris acquisition module, the iris acquisition module comprises a processor system, the processor system is connected with an iris image sensor used for acquiring an iris image, and the processor system is also connected with an infrared distance measuring sensor used for measuring the distance between human eyes and a lens, and the distance measuring device is characterized in that the infrared distance measuring sensor is connected with a power supply module through a power supply control module, and the power supply control module is provided with a timing unit;
the power supply control module controls power supply time through the timing unit and supplies power to the infrared distance measuring sensor periodically;
so that the infrared light emitted by the infrared distance measuring sensor is periodically switched between reaching the human eyes and not reaching the human eyes; the infrared light part time can reach human eyes, distance measurement is carried out in the time, and the infrared light part time can not reach the human eyes, so that iris images of the human eyes under the condition of no infrared light are obtained in the time;
therefore, the iris image of the human eye under the infrared light exists in the image obtained by the iris image sensor, and the iris image of the human eye under the infrared light exists or not;
the iris acquisition module uploads parameters for judging whether infrared light reaches human eyes and an iris image of the human eyes to an upper computer, the upper computer picks out the iris image of the human eyes under the infrared light according to the fact that the infrared light reaches the human eyes, and the iris image of the human eyes under the infrared light is reserved and used as an image for subsequent processing;
the iris acquisition module comprises a shell, and an infrared distance measuring sensor is fixed in the middle of the shell; the device comprises two iris image sensors, wherein one iris image sensor is fixed on the right side of an infrared distance measuring sensor and used for collecting right-eye iris images, and the other iris image sensor is fixed on the left side of the infrared distance measuring sensor and used for collecting left-eye iris images; the two iris image sensors are respectively connected with the processor system;
the left side of the shell is provided with a first opening, the right side of the shell is provided with a second opening, a lens of the iris image sensor for collecting the iris image of the left eye extends out of the first opening, and a lens of the iris image sensor for collecting the iris image of the right eye extends out of the second opening;
a sliding groove is arranged on the inner surface of the shell, and a sliding rail capable of sliding along the sliding groove is respectively arranged behind the lens of the left-eye iris image sensor and the lens of the right-eye iris image sensor; the iris acquisition module also comprises a driving mechanism for driving the sliding rail to move on the sliding groove;
the first opening and the second opening are both long-strip-shaped openings.
5. A distance measuring device applied to an iris acquisition module according to claim 4, wherein: the power supply control module switches the power supply state at least once every 2 seconds.
6. A distance measuring device applied to an iris acquisition module comprises the iris acquisition module, the iris acquisition module comprises a processor system, the processor system is connected with an iris image sensor used for acquiring an iris image, and the processor system is also connected with an infrared distance measuring sensor used for measuring the distance between human eyes and a lens;
the driving motor drives the rotating shaft to rotate, so that the shielding piece on the rotating shaft is driven to rotate, and the infrared light emitted by the infrared distance measuring sensor is periodically blocked;
so that the infrared light emitted by the infrared distance measuring sensor is periodically switched between reaching the human eyes and not reaching the human eyes; the infrared light part time can reach human eyes, distance measurement is carried out in the time, and the infrared light part time can not reach the human eyes, so that iris images of the human eyes under the condition of no infrared light are obtained in the time;
therefore, the iris image of the human eye under the infrared light exists in the image obtained by the iris image sensor, and the iris image of the human eye under the infrared light exists or not;
the iris acquisition module uploads parameters for judging whether infrared light reaches human eyes and an iris image of the human eyes to an upper computer, the upper computer picks out the iris image of the human eyes under the infrared light according to the fact that the infrared light reaches the human eyes, and the iris image of the human eyes under the infrared light is reserved and used as an image for subsequent processing;
the iris acquisition module comprises a shell, and an infrared distance measuring sensor is fixed in the middle of the shell; the device comprises two iris image sensors, wherein one iris image sensor is fixed on the right side of an infrared distance measuring sensor and used for collecting right-eye iris images, and the other iris image sensor is fixed on the left side of the infrared distance measuring sensor and used for collecting left-eye iris images; the two iris image sensors are respectively connected with the processor system;
the left side of the shell is provided with a first opening, the right side of the shell is provided with a second opening, a lens of the iris image sensor for collecting the iris image of the left eye extends out of the first opening, and a lens of the iris image sensor for collecting the iris image of the right eye extends out of the second opening;
a sliding groove is arranged on the inner surface of the shell, and a sliding rail capable of sliding along the sliding groove is respectively arranged behind the lens of the left-eye iris image sensor and the lens of the right-eye iris image sensor; the iris acquisition module also comprises a driving mechanism for driving the sliding rail to move on the sliding groove;
the first opening and the second opening are both long-strip-shaped openings.
7. The distance measuring device as claimed in claim 6, wherein: the driving motor is fixed on the side wall of the infrared distance measuring sensor, the length direction of the rotating shaft is the same as the infrared light emitting direction of the infrared distance measuring sensor, and the shielding piece is positioned in front of the light outlet of the infrared distance measuring sensor;
the shielding piece is in a wafer shape, a plurality of light-transmitting openings are formed in the shielding piece, and the plurality of light-transmitting openings are encircled into a ring shape by taking the central axis of the rotating shaft as the center;
the aperture of the light-transmitting opening is not smaller than the aperture of the light-emitting opening, and the minimum distance between two adjacent light-transmitting openings is not smaller than the aperture value of one light-transmitting opening;
the distance from the center of the light outlet to the rotating shaft is equal to the distance from the center of the light transmitting opening to the rotating shaft.
8. Another distance measuring device applied to an iris acquisition module as claimed in claim 7, wherein: the rotating speed of the driving motor is at least 1 revolution per 2 seconds, and the number of the light-transmitting openings in the shielding piece is two.
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| CN101630064A (en) * | 2009-08-11 | 2010-01-20 | 广东工业大学 | Head video perspective three-dimensional display and control method thereof |
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