CN111093052A - Image acquisition device, image acquisition method and monitoring system - Google Patents
Image acquisition device, image acquisition method and monitoring system Download PDFInfo
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- CN111093052A CN111093052A CN201811247289.1A CN201811247289A CN111093052A CN 111093052 A CN111093052 A CN 111093052A CN 201811247289 A CN201811247289 A CN 201811247289A CN 111093052 A CN111093052 A CN 111093052A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
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- H—ELECTRICITY
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- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/56—Cameras or camera modules comprising electronic image sensors; Control thereof provided with illuminating means
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Abstract
The invention provides an image acquisition device, an image acquisition method and a monitoring system, wherein the image acquisition device comprises a light source module and an acquisition module, the light source module is used for transmitting a first light beam to a target to be acquired, the acquisition module is used for acquiring an image comprising the target to be acquired according to the first light beam, and light rays incident to the acquisition module comprise p-polarized light and s-polarized light with a preset range amount. The image acquisition device provided by the embodiment of the invention realizes the purpose of acquiring high-quality images including the target to be acquired by limiting the light rays incident to the acquisition module to include p polarized light and s polarized light with a preset range amount, namely, the image acquisition device provided by the invention greatly relieves or even avoids the glare phenomenon of the target to be acquired, and further enables the image acquisition device to acquire images with higher quality.
Description
Technical Field
The invention relates to the technical field of image processing, in particular to an image acquisition device, an image acquisition method and a monitoring system.
Background
With the development of image processing technology, intelligent devices that implement functions such as intelligent recognition by means of image processing technology are receiving increasing attention. However, the existing intelligent recognition function realized by means of an image processing technology is greatly influenced by ambient light, and the recognition accuracy is not high.
For example, vehicle monitoring systems with machine vision are highly susceptible to ambient light sources, especially high intensity light sources in dark states (e.g., at night). When the vehicle-mounted monitoring system is used for judging the state of a driver (or a passenger) by identifying the eyeball activity of the driver (or the passenger) during driving at night, because the eyeball or the glasses can generate glare to a light source, and the generated glare can seriously influence the identification operation of the vehicle-mounted monitoring system, the existing vehicle-mounted monitoring system is difficult to realize highly intelligent monitoring functions such as fatigue driving early warning and the like.
Disclosure of Invention
In view of the above, embodiments of the present invention are directed to providing an image capturing device, an image capturing method and a monitoring system, so as to solve the problem that the existing image capturing device cannot clearly capture an image of a target to be captured, which includes glare to incident light.
In a first aspect, an embodiment of the present invention provides an image capturing device, which includes a light source module and a capturing module, wherein the light source module is configured to emit a first light beam to a target to be captured, and the capturing module is configured to capture an image including the target to be captured according to the first light beam, and light incident to the capturing module includes p-polarized light and s-polarized light within a preset range.
In an embodiment of the invention, the first illumination beam is p-polarized light.
In an embodiment of the present invention, the light source module includes a light source emitting unit and a first polarization unit, the light source emitting unit is configured to emit a first light beam, and the first polarization unit is configured to filter the first light beam emitted by the light source emitting unit into p-polarized light.
In an embodiment of the present invention, the collecting module includes an image collecting unit and a second polarizing unit, the second polarizing unit is configured to filter s-polarized light in reflected light of the first light beam reflected by the target to be collected, and the image collecting unit is configured to collect an image including the target to be collected.
In an embodiment of the present invention, an incident angle of the first light beam on the target to be collected falls within a preset range of brewster's angle.
In an embodiment of the present invention, the target to be collected includes a first reflection surface, an incident angle of the first light beam on the first reflection surface is a brewster angle, and the collection module collects reflected light of the first light beam on the first reflection surface.
In an embodiment of the invention, the first reflective surface is an eyeball reflective surface.
In an embodiment of the present invention, the object to be collected further includes a second reflection surface parallel to the first reflection surface, the refracted light of the first light beam on the first reflection surface is a second light beam, the second light beam is incident on the second reflection surface, and the incident angle of the second light beam on the second reflection surface is brewster's angle.
In an embodiment of the invention, the first reflective surface is a glasses reflective surface, and the second reflective surface is an eyeball reflective surface.
In an embodiment of the invention, an angle range of an incident angle of the first light ray bundle on the first reflecting surface is ± 10 ° of the brewster angle.
In a second aspect, an embodiment of the present invention further provides a monitoring system, where the monitoring system includes the image capturing device mentioned in any of the above embodiments, and further includes a processing module in signal connection with the image capturing device, and the processing module is configured to perform a processing operation on an image captured by the image capturing device.
In a third aspect, an embodiment of the present invention further provides an image capturing method, where the image capturing method includes illuminating an object to be captured with a first light beam; and acquiring an image comprising a target to be acquired according to the first light ray bundle, wherein the acquired light rays comprise p-polarized light and s-polarized light with a preset range amount.
The image acquisition device provided by the embodiment of the invention realizes the purpose of acquiring high-quality images including the target to be acquired by limiting the light rays incident to the acquisition module to include p polarized light and s polarized light with a preset range amount, namely, the image acquisition device provided by the invention greatly relieves or even avoids the glare phenomenon of the target to be acquired, and further enables the image acquisition device to acquire images with higher quality.
In addition, according to the image acquisition device provided by the embodiment of the invention, the first polarization unit, the second polarization unit, the polarization system and other structures are arranged, so that the P polarized light in the reflected light of the first light beam reflected by the target to be acquired is filtered and removed, the light incident to the acquisition module only comprises the P polarized light, and the interference of the glare phenomenon on the image acquisition process is completely avoided.
Drawings
Fig. 1a is a schematic application diagram of an image capturing device according to a first embodiment of the present invention.
Fig. 1b is a schematic view illustrating a light direction in an image capturing device according to a first embodiment of the present invention.
Fig. 2 is a schematic application diagram of an image capturing device according to a second embodiment of the present invention.
Fig. 3 is a schematic application diagram of an image capturing device according to a third embodiment of the present invention.
Fig. 4a is a schematic application diagram of an image capturing device according to a fourth embodiment of the present invention.
Fig. 4b is a schematic view illustrating a light direction in an image capturing device according to a fourth embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a light source module in an image capturing device according to a fifth embodiment of the present invention.
Fig. 6 is a schematic flow chart of an image acquisition method according to a sixth embodiment of the present invention.
Fig. 7 is a schematic structural diagram of a monitoring system including an image capturing device according to a seventh embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The generation of the glare is caused by specular reflection (specular reflection) at the interface in terms of the functional relationship between light and a substance. The interface is defined as any surface with two abrupt changes of refractive index, and typically comprises two surfaces of a spectacle lens, an eyeball surface and the like. The specular reflection itself does not contain any information about the surface to be measured and the substances present under the surface. It can also be seen by name that specular reflection resembles a mirror, and this portion of the light is actually the source of the light that is imaged as illumination. It is therefore an object of the present invention how to mitigate or even remove the specular reflection of such interfaces while retaining information that the interfaces include the diffuse reflection (dispersion) of objects behind the interface. The diffuse reflection itself contains more material structure information, a typical analogy being for example dirt on the mirror surface or scratches on the back etc. In particular for our application, diffuse reflection encompasses all other light rays reflected from the eye, such as reflected light rays from the pupil, retina, etc., except for specular reflections from portions of the cornea on the surface of the eye. Effective utilization of controlling the polarization state of incident and collected light is an effective way to suppress specular reflection (i.e., glare).
Fig. 1a is a schematic application diagram of an image capturing device according to a first embodiment of the present invention. As shown in fig. 1a, the image capturing device provided in the embodiment of the present invention includes a light source module 1 and a capturing module 2, the light source module 1 is configured to emit a first light beam to a target 3 to be captured, and the capturing module 2 is configured to capture an image including the target 3 to be captured according to reflected light of the first light beam at the target 3 to be captured, where an incident angle of the first light beam on the target 3 to be captured falls within a preset range of brewster angle, and the first light beam is a light beam including both p-polarized light and s-polarized light.
It should be noted that the preset range of the brewster angle refers to a preset angle range capable of polarizing the reflected light generated by the first light beam on the target 3 to be collected. For example, when the target 3 to be acquired only includes one reflecting surface (e.g., an eyeball), the preset range of the brewster angle is the brewster angle; when the target 3 to be collected includes two reflecting surfaces (i.e., a first reflecting surface and a second reflecting surface, such as a lens and an eyeball), light firstly enters the first reflecting surface and then enters the second reflecting surface, and the collection module 2 collects the reflected light on the second reflecting surface, the preset range of the brewster angle is just capable of ensuring that the specular reflection light of the first light beam on the second reflecting surface can be polarized, i.e., the angle of the incident light of the first light beam on the second reflecting surface is the brewster angle. Because the brewster angles of the first reflecting surface and the second reflecting surface are possibly different, the requirement of the brewster angle of the first reflecting surface is ensured when the first reflecting surface and the second reflecting surface cannot be considered simultaneously.
Therefore, the preset range of the brewster angle can be set according to the actual situation, and the embodiment of the invention does not limit the preset range uniformly.
Furthermore, it should be noted that the object 3 to be collected should comprise a smooth surface capable of causing glare (i.e. specular reflection) to the light. It should be understood that a smooth surface includes, but is not limited to, a smooth plane or a smooth curved surface, which may approximate a smooth plane.
Fig. 1b is a schematic view illustrating a light direction in an image capturing device according to a first embodiment of the present invention. With reference to fig. 1b, it should be noted that, since the incident angle of the first light beam on the target 3 to be collected falls within the preset range of brewster angle, the reflected light of the first light beam on the target 3 to be collected is polarized according to the fresnel reflection and refraction law, that is, the reflected light is divided into s-polarized light for specular reflection and p-polarized light for diffuse reflection. It should be understood that the source of the glare effect is s-polarized light reflected by a mirror surface, so that the glare effect can be reduced or completely avoided by reducing or eliminating the s-polarized light, and a clear image including more effective information related to the target 3 to be acquired is acquired.
Specifically, referring to fig. 1b, the reflection surface is a smooth surface of the target 3 to be collected, which generates glare to light, and when the first light beam (i.e., the incident light p + s) is incident on the reflection surface of the target 3 to be collected, reflection and refraction phenomena occur. Since the first bundle of rays is incident at the brewster angle, the angle between the reflected light and the refracted light formed based on the first bundle of rays is 90 °, and the reflected light polarizes the light into s-polarized light and p-polarized light.
It should be understood that the reflected light formed based on the first light beam is the light incident on the collection module 2, that is, a specific triangular position relationship is formed among the light source module 1, the collection module 2 and the target 3 to be collected, and when the target 3 to be collected only includes one reflection surface, the specific triangular position relationship can ensure that the incident angle of the first light beam on the target 3 to be collected is at the brewster angle. In addition, it should be noted that specific position data of the specific triangular position relationship may be calculated according to a fresnel equation, which is not described in detail in the embodiments of the present invention.
In the practical application process, the reflected light is polarized and divided into s-polarized light and p-polarized light, so that the purpose of clearly acquiring effective information related to the target 3 to be acquired can be achieved as long as the acquisition module 2 only acquires the p-polarized light and filters the s-polarized light.
Preferably, the collection module 2 is implemented by a technology of collecting only p-polarized light and filtering out s-polarized light, and the technology can be implemented by a polarizer, which is not uniformly limited and described in detail in the embodiment of the present invention.
Of course, if the light emitted by the light source itself does not contain s-polarization, specular reflection on the collection object is naturally reduced or even eliminated. This has the advantage that the intensity of light incident on the human eye is reduced and is more safe for the human eye. As used herein, the wavelength is most commonly infrared, and the typical center wavelength is 940nm or 850nm, and the light source may be an infrared LED or the like. The polarized incident light may be realized by a polarizing plate or the like.
According to the image acquisition device provided by the embodiment of the invention, the polarization division of the reflected light of the first light beam on the reflecting surface of the target to be acquired is realized by limiting the incident angle of the first light beam to fall into the preset range of the Brewster angle, the glare phenomenon is avoided through the selective acquisition function of the acquisition module, the s-polarized light in the reflected light of the first light beam reflected by the target to be acquired is filtered and removed, the light incident on the acquisition module only comprises the p-polarized light, and compared with the case that the light incident on the acquisition module simultaneously comprises the p-polarized light and the s-polarized light, the image acquisition device provided by the embodiment of the invention greatly relieves the glare phenomenon generated by the target to be acquired on the first light beam, reduces and even avoids the interference of the glare phenomenon on the image acquisition process, and further enables the image acquisition device to acquire images with higher quality.
In an embodiment of the present invention, the target 3 to be collected is an eyeball of a human or an animal, and the reflective surface of the target 3 to be collected is an eyeball reflective surface of a human or an animal.
In another embodiment of the invention, the object 3 to be acquired is an eyeball (i.e. comprising two reflecting surfaces) comprising lenses, and the preset range of brewster angle is 56 ° to 60 °. Specifically, the calculation formula is as follows:
n1×sinα＝n2×sinβ(1)
in the formula (1), n1Is the refractive index of air, n2For the refractive index of the lens in the object to be acquired, tan α ═ n2，α+β＝90°。
When n is calculated by the formula (1)2When 1.5, α is 56.3 deg., when n is2When the incident angle of the first light beam incident on the lens is limited to 56 ° to 60 °, 1.732, α is 60 °.
It should be noted that, when the first reflecting surface in the target 3 to be collected is made of other materials, if it is to be ensured that the incident angle of the light incident on the second reflecting surface is the brewster angle, the incident angle range of the light incident on the first reflecting surface can also be calculated according to the formula (1), which is not described in detail in the embodiment of the present invention.
As can be seen from the brewster angle of the above embodiments and common materials, the incident angle of the first light ray bundle on the first reflection surface is preferably within ± 10 ° of the brewster angle.
That is, in the present invention, it is sufficient to ensure that the light incident on the collection module 2 includes p-polarized light and a preset range amount of s-polarized light. The preset range amount of the s-polarized light refers to a preset range amount which can ensure that the s-polarized light does not obstruct the acquisition process of the acquisition module 2 and can not generate serious glare.
Preferably, the predetermined range amount is zero, i.e. the light incident on the collection module 2 does not comprise s-polarized light.
Fig. 2 is a schematic application diagram of an image capturing device according to a second embodiment of the present invention. The second embodiment of the present invention is extended from the first embodiment of the present invention, and the differences between the second embodiment and the first embodiment will be emphasized below, and the descriptions of the same parts will not be repeated.
As shown in fig. 2, in the image capturing apparatus provided in the embodiment of the present invention, the target 3 to be captured is an eyeball including only one reflecting surface, and the light source module 1 includes a light source emitting unit 11 and a first polarizing unit 12. In practical applications, the light source emitting unit 11 is configured to emit a first light beam, where the first light beam includes both p-polarized light and s-polarized light; the first polarization unit 12 is configured to filter the first bundle of light rays emitted by the light source emission unit 11 into p-polarized light.
That is to say, in the embodiment of the present invention, the first polarization unit 12 filters the first light beam into p-polarized light, and the p-polarized light obtained after filtering is incident on the target to be collected, so that the light finally incident on the collection module 2 has no s-polarized light, and the occurrence of the glare phenomenon is completely avoided.
It should be noted that, in the embodiment of the present invention, an angle range of an incident angle at which the p-polarized light is incident on the target to be collected may also be other than the brewster angle, and this is not uniformly limited in the embodiment of the present invention.
According to the image acquisition device provided by the embodiment of the invention, the first light ray bundle is filtered into p-polarized light by virtue of the first polarization unit in the light source module, and the p-polarized light obtained after filtering is incident on the target to be acquired, so that the interference of the glare phenomenon on the image acquisition process is completely avoided.
In addition, according to the image acquisition device provided by the embodiment of the invention, the first polarization unit is arranged between the light source emission unit and the target to be acquired, and the first light beam can be incident on the target to be acquired only by passing through the first polarization unit, so that the possible damage of the first light beam to the target to be acquired is effectively reduced. For example, the embodiment of the invention can effectively reduce the intensity of light incident on the eyeball (namely the target to be collected) while ensuring that the collection module collects the non-glare image, thereby avoiding the possible damage of the first light beam to the eyeball and improving the safety of the eyeball.
Fig. 3 is a schematic application diagram of an image capturing device according to a third embodiment of the present invention. The third embodiment of the present invention is extended from the first embodiment of the present invention, and the differences between the third embodiment and the first embodiment will be emphasized below, and the descriptions of the same parts will not be repeated.
As shown in fig. 3, in the image capturing apparatus according to the embodiment of the present invention, the target 3 to be captured is an eyeball including only one reflecting surface, the first light beam emitted by the light source module 1 includes both p-polarized light and s-polarized light, and the capturing module 2 includes the image capturing unit 21 and the second polarizing unit 22. In practical application, the second polarization unit 22 is configured to filter out s-polarized light in reflected light of the first light beam reflected by the target 3 to be acquired, and the image acquisition unit 21 is configured to acquire an image including the target to be acquired.
That is to say, in the embodiment of the present invention, after the first light beam emitted by the light source module 1 enters the object 3 to be collected at an angle of incidence of brewster angle, the reflected light may be polarized, specifically, the reflected light is polarized and divided into s-polarized light for generating specular reflection and p-polarized light for generating diffuse reflection, and then the second polarization unit 22 filters out the s-polarized light in the reflected light, so that only the p-polarized light enters the image collection unit in the collection module 2 from the reflected light of the first light beam entering the object 3 to be collected.
According to the image acquisition device provided by the embodiment of the invention, the s-polarized light in the reflected light of the first light beam reflected by the target to be acquired is filtered by means of the second polarization unit in the acquisition module, so that the interference of the glare phenomenon on the image acquisition process is completely avoided.
Fig. 4a is a schematic application diagram of an image capturing device according to a fourth embodiment of the present invention. Fig. 4b is a schematic view illustrating a light direction in an image capturing device according to a fourth embodiment of the present invention. The fourth embodiment of the present invention is extended from the first embodiment of the present invention, and the differences between the fourth embodiment and the first embodiment will be emphasized below, and the descriptions of the same parts will not be repeated.
As shown in fig. 4a and 4b, compared with the first embodiment, the target 3 to be collected in the embodiment of the present invention includes an eyeball 31 and a lens 32 located on the front side of the eyeball 31 (where the front side is the left side of the orientation shown in fig. 4 a).
It should be understood that since the thickness of the lens 32 is thin, the lens 32 is approximated to a first reflection surface 321 for reflecting and refracting light rays, respectively, the eyeball 31 is approximated to a second reflection surface 311 for reflecting and refracting light rays, and the first reflection surface 321 is parallel to the second reflection surface 311.
As can be seen by referring to fig. 4b, in the embodiment of the present invention, the first illumination beam emitted by the light source module 1 includes both p-polarized light and s-polarized light. In the embodiment of the present invention, the propagation process of light is: a first light beam emitted by the light source module 1 firstly enters the lens 32 in the target 3 to be collected at an angle of which the incident angle falls in a preset range of a Brewster angle, and the reflected light of the first light beam reflected by the lens 32 is polarized and divided into s-polarized light and p-polarized light and enters the collection module 2; in addition, since the first reflection surface 321 approximated by the glasses 32 is parallel to the second reflection surface 311 approximated by the eyeball 31, the refracted light (including both p-polarized light and s-polarized light) of the first light beam refracted by the lens 32 enters the eyeball 31 at the brewster angle of the incident angle, the refracted light entering the eyeball 31 is reflected on the eyeball 31 to form a reflected light, the reflected light is also polarized and divided into s-polarized light and p-polarized light, and the reflected light reflected by the eyeball 31 enters the collection module 2 through the glasses 32.
It should be noted that, from a strict optical point of view, the interfaces with different refractive indexes are optical reflection surfaces, and therefore, from a strict optical point of view, the eyeglasses include two optical reflection surfaces. However, since the thickness of the glasses has a negligible effect in the embodiments of the present invention, it is fully possible to make the two optical reflection surfaces of the glasses equivalent to the first reflection surface in the present application, so as to facilitate the description and presentation of the following embodiments.
As described in the first embodiment, in the practical application process, since the reflected light is already polarized and divided into s-polarized light and p-polarized light, as long as the collection module 2 collects only p-polarized light and filters out s-polarized light, the purpose of clearly collecting effective information related to the target 3 to be collected can be achieved.
Preferably, the collection module 2 is implemented by a technology of collecting only p-polarized light and filtering out s-polarized light, and the technology can be implemented by a polarizer, which is not uniformly limited and described in detail in the embodiment of the present invention.
In the embodiment of the present invention, although the object 3 to be captured includes the first reflecting surface 321 and the second reflecting surface 311 (i.e., the eyeglasses 32 and the eyeball 31) which are parallel to each other, when the first bundle of light rays emitted from the light source module 1 is incident on the first reflecting surface 321 in the object 3 to be captured at an angle of incidence which falls within a preset range of brewster's angle, the generated refracted light may be incident on the second reflecting surface 311 at an angle of incidence which is the brewster's angle. That is, the reflected light incident into the collection module 2 after being reflected by the first reflection surface 321 and the second reflection surface 311 is polarized and divided into s-polarized light and p-polarized light, and then the s-polarized light in the emitted light is filtered and removed by virtue of the selective collection function of the collection module 2. Therefore, compared with the case that the light rays incident into the acquisition module 2 comprise both p-polarized light and s-polarized light, the embodiment of the invention greatly relieves the glare phenomenon of the target to be acquired, which comprises two parallel reflecting surfaces, to the first light ray bundle, reduces or even avoids the interference of the glare phenomenon to the image acquisition process, and further enables the image acquisition device to acquire images with higher quality.
Preferably, in an embodiment of the present invention, the image capturing device further includes a third polarization unit for filtering out s-polarized light, wherein the third polarization unit is disposed between the object 3 to be captured and the capturing module 2. It should be understood that the third polarization unit is used to filter out s-polarized light in the reflected light reflected by the first reflection surface 321 and the second reflection surface 311 of the target 3 to be collected, that is, after being filtered by the third polarization unit, the reflected light reflected by the first reflection surface 321 and the second reflection surface 311 only includes p-polarized light, so as to completely avoid interference of the glare phenomenon on the image collection process.
Preferably, another embodiment of the present invention is extended on the basis of the fourth embodiment of the present invention, and the differences between the embodiment of the present invention and the fourth embodiment are mainly described below, and the descriptions of the same parts are omitted. Specifically, in the embodiment of the present invention, the image capturing device further includes a polarization system for converting a type of polarized light, so as to realize flexible conversion between different polarized lights, thereby achieving the purpose of completely eliminating s-polarized light in reflected light of the target 3 to be captured, and completely avoiding interference of a glare phenomenon on an image capturing process. It should be noted that the specific number and the setting position of the polarization systems can be set according to the actual situation, and detailed description is omitted in the embodiments of the present invention.
Fig. 5 is a schematic structural diagram of a light source module in an image capturing device according to a fifth embodiment of the present invention. As shown in fig. 5, the light source module in the image capturing device according to the embodiment of the present invention includes a light source 51, a polarization recovery module 52, and a polarizing plate 53. Wherein the light source 51 is used for emitting a bundle of light rays; the polarization recovery module 52 is used to convert the type of polarized light, such as s-polarized light to p-polarized light; the polarizing plate 53 serves to filter out s-polarized light that may cause a glare phenomenon.
Preferably, the polarization recovery module 52 is a reflective polarizer (DBEF).
The image acquisition device provided by the embodiment of the invention realizes the purpose of recycling and converting different types of polarized light by virtue of the polarization recycling module in the light source module, thereby further improving the adaptability and the application universality of the image acquisition device provided by the embodiment of the invention, and in addition, more solutions can be provided for eliminating the glare phenomenon of the target to be acquired.
In an embodiment of the invention, the Light source 51 is a Light Emitting Diode (LED), the Light emitted by the LED includes both p-polarized Light and s-polarized Light, and the polarization recycling module 52 is configured to recycle the s-polarized Light, i.e., convert the s-polarized Light into p-polarized Light.
Fig. 6 is a schematic flow chart of an image acquisition method according to a sixth embodiment of the present invention. As shown in fig. 6, an image capturing method according to a sixth embodiment of the present invention includes the following steps.
Step S10: and irradiating the target to be acquired by utilizing the first light beam.
Step S20: and acquiring an image comprising a target to be acquired according to the first light ray bundle, wherein the acquired light rays comprise p-polarized light and s-polarized light with a preset range amount.
In the practical application process, firstly, a target to be collected is irradiated by the first light beam, and then an image including the target to be collected is collected according to the first light beam, wherein the collected light includes p-polarized light and s-polarized light with a preset range amount.
Preferably, the preset range amount of s-polarized light is zero.
It should be understood that the image acquisition method provided by the embodiment of the invention alleviates or even eliminates the glare phenomenon of the target to be acquired on the first light beam, reduces or even avoids the interference of the glare phenomenon on the image acquisition process, and further enables the image acquisition device to acquire images with higher quality.
Fig. 7 is a schematic structural diagram of a monitoring system including an image capturing device according to a seventh embodiment of the present invention. As shown in fig. 7, the monitoring system provided in the embodiment of the present invention includes the image capturing device mentioned in any one of the above embodiments, wherein the image capturing device includes a light source module 72, a capturing module 7, and a processing module 71 in signal connection with the image capturing device, and the processing module 71 is configured to process an image captured by the image capturing device.
Preferably, the processing operation performed by the processing module 71 is a processing operation performed according to the image acquired by the acquisition module 7 in the image acquisition device, including but not limited to an operation of warning, marking, and the like.
It should be understood that the monitoring system provided by the embodiment of the present invention can acquire a non-glare image including an object to be acquired by using the image acquisition device mentioned in the above embodiments, and further perform operations such as image analysis and processing on the acquired non-glare image.
In an embodiment of the present invention, the monitoring system mentioned in the above embodiment is applied to an automobile, that is, an on-board monitoring system, which monitors fatigue driving of a driver by acquiring an eyeball image of the driver, and sends out an early warning signal in case of emergency. It should be understood that when the vehicle is in a night driving state or in a dim light scene, the vehicle-mounted monitoring system provided by the embodiment of the invention can still realize a monitoring function, and by means of the arrangement of the image acquisition device in the vehicle-mounted monitoring system, a glare phenomenon possibly generated by eyeballs of a driver under light irradiation is fully avoided, so that high-quality images for subsequent processing are acquired, and finally, intelligent monitoring functions such as fatigue driving early warning and the like are realized.
In addition, it should be understood that the setting position of each module structure in the vehicle-mounted monitoring system may be set according to the actual situation, so as to sufficiently improve the adaptability and the application universality of the vehicle-mounted monitoring system provided by the embodiment of the present invention, which is not limited in this embodiment of the present invention.
Alternatively, the light source module 72 in the image acquisition device of the monitoring system is disposed on the a-pillar of the vehicle cab, and the acquisition module 73 in the image acquisition device of the monitoring system is disposed on the rear view mirror in the vehicle cab.
Alternatively, the light source module 72 in the image acquisition device of the monitoring system is disposed on the rear view mirror in the vehicle cab, and the acquisition module 73 in the image acquisition device of the monitoring system is disposed on the a-pillar in the vehicle cab.
Alternatively, the light source module 72 in the image acquisition device of the monitoring system is disposed on the steering wheel in the vehicle cab, and the acquisition module 73 in the image acquisition device of the monitoring system is disposed on the dashboard of the vehicle cab.
Preferably, the light source module 72 in the image acquisition device of the monitoring system is an LED light source, and the number of the light source modules 72 is plural.
Preferably, the acquisition module 73 in the image acquisition device of the monitoring system is a coms (complementary metal oxide semiconductor) image sensor.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and the like that are within the spirit and principle of the present invention are included in the present invention.
Claims (12)
1. The utility model provides an image acquisition device which characterized in that, includes light source module and collection module, the light source module is used for launching first pencil to waiting to gather the target, collection module is used for according to first pencil collection includes waiting to gather the image of target, wherein, incides collection module's light includes p polarized light and the s polarized light of predetermineeing the scope volume.
2. The image capture device of claim 1, wherein the first bundle of rays is p-polarized light.
3. The image capturing device as claimed in claim 1, wherein the light source module comprises a light source emitting unit and a first polarizing unit, the light source emitting unit is configured to emit the first light beam, and the first polarizing unit is configured to filter the first light beam emitted by the light source emitting unit into p-polarized light.
4. The image capturing device according to claim 1, wherein the capturing module includes an image capturing unit and a second polarization unit, the second polarization unit is configured to filter s-polarized light in reflected light of the first light beam reflected by the object to be captured, and the image capturing unit is configured to capture an image including the object to be captured.
5. The image capturing device of claim 1, wherein an incident angle of the first light beam on the target to be captured falls within a preset range of brewster's angle.
6. The image capturing device according to claim 5, wherein the object to be captured includes a first reflecting surface, an incident angle of the first light beam on the first reflecting surface is brewster angle, and the capturing module captures the reflected light of the first light beam on the first reflecting surface.
7. The image capturing device of claim 6, wherein the first reflective surface is an eye reflective surface.
8. The image capturing device according to claim 6, wherein the object to be captured further includes a second reflecting surface locally parallel to the first reflecting surface in the vicinity of the light incident point, the refracted light of the first light beam on the first reflecting surface is a second light beam, the second light beam is incident on the second reflecting surface, and the incident angle of the second light beam on the second reflecting surface is brewster's angle.
9. The image capturing device of claim 8, wherein the first reflective surface is a pair of glasses comprising sunglasses and a vision correcting reflective surface, and the second reflective surface is an eye-ball reflective surface.
10. The image capturing device of claim 8 or 9, wherein the angle range of the incident angle of the first light ray bundle on the first reflecting surface is ± 10 ° of brewster's angle.
11. A monitoring system comprising the image capturing device as claimed in any one of claims 1 to 10, and further comprising a processing module in signal communication with the image capturing device, the processing module being configured to perform a processing operation on the image captured by the image capturing device.
12. An image acquisition method, comprising:
irradiating a target to be acquired by using a first light beam;
and collecting an image including the target to be collected according to the first light ray bundle, wherein the collected light rays include p-polarized light and s-polarized light within a preset range.
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| CN201811247289.1A CN111093052A (en) | 2018-10-24 | 2018-10-24 | Image acquisition device, image acquisition method and monitoring system |
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| CN201811247289.1A CN111093052A (en) | 2018-10-24 | 2018-10-24 | Image acquisition device, image acquisition method and monitoring system |
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