CN113612934B - Light intensity self-adaptive camera system based on IR-CUT - Google Patents
Light intensity self-adaptive camera system based on IR-CUT Download PDFInfo
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Abstract
The invention provides an IR-CUT-based light intensity self-adaptive camera system which is characterized by comprising a processor, an imaging subsystem and a filtering subsystem, wherein the filtering subsystem is used for detecting and improving incident light, the imaging subsystem is used for forming an image according to the incident light, the processor is used for processing data detected by the filtering subsystem and controlling the filtering subsystem, the filtering subsystem comprises an illumination sensor, a wavelength filtering module and a polarization filtering module, the illumination sensor is used for detecting the illumination intensity of light entering the camera system, the wavelength filtering module is used for controlling the wavelength range of the light entering the imaging subsystem, and the polarization filtering module is used for controlling the illumination intensity entering the imaging subsystem; the system makes the light used for imaging closer to the ideal situation by controlling two aspects of the wavelength range and the illumination intensity.
Description
Technical Field
The invention relates to the technical field of camera processing, in particular to an IR-CUT-based light intensity self-adaptive camera system.
Background
In a camera system, an imaging element can recognize light which cannot be observed by human eyes, so that the final imaging effect is deviated from the effect observed by naked eyes, and in a dark environment, due to insufficient illumination, imaging is dark and a clear picture cannot be presented, so that an IR-CUT filter is required to preprocess the light, and the IR-CUT filter is automatically switched according to the intensity of external light, so that the image achieves the optimal effect.
A number of camera systems have now been developed, and after a number of searches and references, it has been found that there are camera systems such as those disclosed in the publication nos. KR101815106B1, KR101782304B1, CN109996061B and KR100848167B1, whose IR-CUTs are installed in a surveillance camera placed in a light box in which the intensity of infrared light and visible light is adjustable, the method comprising: and setting the working state of the monitoring camera to be a black-and-white state or a color state in response to the operation of a user, respectively calculating the total color value of each color in the three primary colors of all pixel points on the image according to the image acquired by the monitoring camera in the black-and-white state or the color state, and further determining whether the IR-CUT is abnormal according to the ratio of the total color values of different colors. However, the IR-CUT in this system has a limited switching state, and the adjustment effect has discreteness, and cannot achieve the optimal image adjustment effect.
Disclosure of Invention
The invention aims to provide an IR-CUT-based light intensity adaptive camera system aiming at the defects,
the invention adopts the following technical scheme:
an IR-CUT-based light intensity self-adaptive camera system is characterized by comprising a processor, an imaging subsystem and a filtering subsystem, wherein the filtering subsystem is used for detecting and improving incident light rays, the imaging subsystem is used for forming images according to the incident light rays, and the processor is used for processing data detected by the filtering subsystem and controlling the filtering subsystem;
the filtering subsystem comprises an illuminance sensor, a wavelength filtering module and a polarization filtering module, wherein the illuminance sensor is used for detecting the illumination intensity I of light rays entering the camera system, and the wavelength filtering module is used for controlling the wavelength range (lambda) of the light rays entering the imaging subsystemc，λd) The polarization filtering module is used for controlling the illumination intensity entering the imaging subsystem;
controlling lambda when the illumination intensity I is larger than a threshold value IdComprises the following steps:
wherein λ is0The critical wavelength of infrared light and visible light, Δ λ is the basic bandwidth, and the expression of the intermediate parameter u is:
wherein k isIIs a base bandwidth factor;
controlling the polarization angle theta of the polarization filtering module to be:
furthermore, the wavelength filtering module comprises a front optical filter switching module and a front optical filter switching driver, the front optical filter switching module comprises a band-pass filtering unit, the band-pass filtering unit consists of a short-wave pass optical filter and a long-wave pass optical filter, the long-wave pass optical filter is fixed on the optical axis, the front filter switching driver consists of a circuit for driving a motor of the front optical filter switching module, and according to a control instruction of the processor, the front optical filter switching driver moves the short-wave pass optical filter by driving a motor of the front optical filter switching module so as to enable the required short-wave pass optical filter to be on the optical axis;
further, the short-wave pass filter comprises n different infrared filters, and the filtering boundary of the infrared filters uses lambda1、λ2、..、λnIndicates the filtering boundary lambda of the ith infrared external filteriThe method comprises the following steps:
further, the polarization filter module includes a polarization filter rotation driver and a polarization filter, the polarization filter rotation driver is composed of a circuit for driving a polarization filter rotating motor and rotates a polarization axis of the polarization filter disposed on an optical axis by a predetermined angle;
further, the camera system also comprises short-wavelength illumination, and when the illumination intensity I is smaller than a threshold value I', the light quantity suitable for imaging is compensated by enabling the short-wavelength illumination.
The beneficial effects obtained by the invention are as follows:
the infrared filter of the system is integrated in an annular structure, the switching state quantity of the IR-CUT is improved as much as possible on the premise of not occupying a large space, and meanwhile, the light intensity is adjusted by matching with the polarizing filter, so that the adjusting effect has linear change, and the light used for imaging is more approximate to the ideal condition.
Drawings
The invention will be further understood from the following description in conjunction with the accompanying drawings. The components in the figures are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the embodiments. Like reference numerals designate corresponding parts throughout the different views.
FIG. 1 is a schematic view of an overall structural framework;
FIG. 2 is a schematic diagram of system mode selection;
FIG. 3 is a schematic diagram of a bandpass filtering unit;
FIG. 4 is a schematic diagram of a filter boundary distribution of an infrared filter;
FIG. 5 is a schematic diagram of the polarization decomposition of the polarized light by the polarizing filter.
Detailed Description
In order to make the objects and advantages of the present invention more apparent, the present invention will be further described in detail with reference to the following embodiments; it should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. Other systems, methods, and/or features of the present embodiments will become apparent to those skilled in the art upon review of the following detailed description. It is intended that all such additional systems, methods, features and advantages be included within this description, be within the scope of the invention, and be protected by the accompanying claims. Additional features of the disclosed embodiments are described in, and will be apparent from, the detailed description that follows.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not indicated or implied that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and are not to be construed as limitations of the present patent, and specific meanings of the terms may be understood by those skilled in the art according to specific situations.
The first embodiment.
With reference to fig. 1, the present embodiment provides an IR-CUT-based light intensity adaptive camera system, which includes a processor, an imaging subsystem, and a filtering subsystem, wherein the filtering subsystem is configured to detect and improve incident light, the imaging subsystem is configured to form an image according to the incident light, and the processor is configured to process data detected by the filtering subsystem and control the filtering subsystem;
the filtering subsystem comprises an illuminance sensor, a wavelength filtering module and a polarization filtering module, wherein the illuminance sensor is used for detecting the illumination intensity I of light rays entering the camera system, and the wavelength filtering module is used for controlling the wavelength range (lambda) of the light rays entering the imaging subsystemc，λd) The polarization filtering module is used for controlling the illumination intensity entering the imaging subsystem;
controlling lambda when the illumination intensity I is larger than a threshold value IdComprises the following steps:
wherein λ is0The critical wavelength of infrared light and visible light, Δ λ is the basic bandwidth, and the expression of the intermediate parameter u is:
wherein k isIIs a base bandwidth factor;
controlling the polarization angle theta of the polarization filtering module to be:
the wavelength filtering module comprises a front optical filter switching module and a front optical filter switching driver, the front optical filter switching module comprises a band-pass filtering unit, the band-pass filtering unit consists of a short-wave pass optical filter and a long-wave pass optical filter, the long-wave pass optical filter is fixed on an optical axis, the front filter switching driver consists of a circuit for driving a motor of the front optical filter switching module, and the front optical filter switching driver moves the short-wave pass optical filter by driving a motor of the front optical filter switching module according to a control instruction of the processor so as to enable the required short-wave pass optical filter to be on the optical axis;
the short-wave pass filter comprises n different infrared filters, and the filtering boundary of the infrared filters uses lambda1、λ2、..、λnIndicates the filtering boundary lambda of the ith infrared external filteriThe method comprises the following steps:
the polarization filter module comprises a polarization filter rotation driver and a polarization filter, wherein the polarization filter rotation driver is composed of a circuit for driving a polarization filter rotating motor and enables a polarization axis of the polarization filter arranged on an optical axis to rotate by a preset angle;
the camera system also includes short wavelength illumination that compensates for an amount of light suitable for imaging by enabling the short wavelength illumination when the illumination intensity I is less than a threshold I'.
Example two.
The present embodiment includes all the contents of the first embodiment, and provides an IR-CUT-based light intensity adaptive imaging system, including a processor, a memory, an imaging device, an illumination driver, short wavelength illumination, a lens block, a lens driver, an in-lens filter switching module, an in-lens filter switching driver, a front filter switching module, a front filter switching driver, a polarizing filter rotation driver, and an illuminance sensor;
the processor serves as a controller that controls the overall operation of the system, performs a control process that controls the operation of each unit, a data input and output process between units, a data calculation process, and a data storage process, operates according to a program stored in a memory, uses the memory during operation, and temporarily stores data or information generated or acquired by the processor in the memory;
the memory comprises two parts, namely a RAM and a ROM, wherein the RAM is used for temporarily storing data or information used in system operation, and the ROM stores programs needed for executing the system operation in advance;
the imaging element is an image sensor capable of imaging, and is implemented by a solid-state imaging element that generates an electric signal of a captured image based on photoelectric conversion of incident light to be imaged on an imaging plane, the imaging element being implemented by an integrated circuit board having thereon the above-mentioned solid-state imaging element, an amplifier for amplifying the electric signal output from the solid-state imaging element, a gain adjusting unit capable of adjusting a gain, the output of the imaging element being input to a processor and performing predetermined signal processing to generate data of a captured image, or the imaging element may be provided with a control circuit to perform the above-mentioned predetermined signal processing to generate data of the captured image;
the illumination driver is implemented by a switching circuit, controls the switching circuit in accordance with a control instruction from the processor to turn on or off each short-wavelength illumination, and may further include a variable amplifier circuit capable of adjusting the light emission amount of the short-wavelength illumination, in which case the illumination driver may adjust the light emission amount of the short-wavelength illumination in accordance with the control instruction from the processor;
the short wavelength illumination is realized by a light emitting diode, the image pickup system is configured with a plurality of short wavelength illuminations, the short wavelength illuminations are irradiated with IR light, the IR light is illumination light with intensity according to control of an illumination driver so as to form an image of an object in the closed space, and the amount of infrared light suitable for the image formation is compensated by irradiation with the IR light from the short wavelength illuminations;
the lens block includes a focus lens that images an optical image of an object on an imaging surface of the imaging element by focusing according to a distance thereof to the object, and a zoom lens that can change magnification, a position of the focus lens and a position of the zoom lens in the lens block being stored in a memory as camera parameters;
the lens driver is composed of a circuit for adjusting the position of the lens constituting the lens block, the lens driver adjusting the position of the focus lens in the lens block according to a control instruction from the processor, the lens driver being capable of changing the zoom magnification by adjusting the position of the zoom lens according to the control instruction from the processor;
the in-lens filter switching module, in which a visible light cut filter and a plane glass can be switched and alternately switched and disposed on an optical axis of an optical element, is disposed behind a lens block and in front of an imaging element, and, for example, during a daytime mode, the in-lens filter switching module arranges the visible light cut filter on the optical axis so that the imaging element receives light that is not blocked in visible light and obtains a captured image with good image quality, and, on the other hand, arranges the plane glass on the optical axis so that, in a nighttime mode, the imaging element receives incident light in which components of an IR band pass through the plane glass, and obtains an IR image with constant brightness based on the incident light, the in-lens filter switching driver is composed of a circuit for driving the in-lens filter switching module, and drives the in-lens filter switching module according to a control instruction from the processor;
the front optical filter switching module comprises a band-pass filtering unit, the band-pass filtering unit consists of a short-wave pass optical filter and a long-wave pass optical filter, the long-wave pass optical filter is fixed on an optical axis, the front optical filter switching driver consists of a circuit for driving a motor of the front optical filter switching module, and the front optical filter switching driver moves the short-wave pass optical filter by driving a motor of the front optical filter switching module according to a control instruction of the processor so that the required short-wave pass optical filter is on the optical axis;
the polarization filter rotation driver is composed of a circuit for driving a polarization filter rotating motor, the polarizing filter rotation driver drives the polarizing filter rotation motor in accordance with a control instruction from the processor, a polarizing axis of a polarizing filter provided on an optical axis is rotated by a predetermined angle, an amount of light transmitted through the polarizing filter is limited by tilting the polarizing axis of the polarizing filter, the polarizing filter is rotatable within a mechanical rotation range, when the rotation of the polarizing filter rotating motor is accelerated after the polarizing filter rotating motor is started, the angular velocity of the polarizing filter rotating motor is gradually increased and reaches a constant angular velocity, in this case, the polarizing filter is accelerated to a range where the polarizing filter can be rotated at a constant speed, and, on the other hand, when the rotation of the polarizing filter rotating motor is decelerated, the angular velocity of the polarizing filter rotating motor is gradually reduced to 0;
the range in which the polarizing filter can rotate at a constant speed can be randomly adjusted through the torque of a polarizing filter rotating motor, the angle of a polarizing axis of the polarizing filter is adjusted according to the rotation amount of the polarizing filter from an original point detected by a polarizing filter rotating original point sensor, and the deflection angle of the polarizing filter is stored in a memory as a camera parameter;
referring to fig. 2, the illuminance sensor for detecting illuminance of light around the camera system, the illuminance sensor using a photodiode or a phototransistor is mounted in front of the lens block so as to be able to detect illuminance as light in a direction in which the illuminance sensor detects illuminance information input to the processor, and the processor determines whether an operation mode of the camera system is a daytime mode or a nighttime mode at a current point in time based on the illuminance information, for example, when the processor determines that the illuminance information is higher than a predetermined threshold, the processor sets the operation mode of the camera system to be switched to the daytime mode, and when the processor determines that the illuminance information is lower than the predetermined threshold, the processor sets the operation mode of the vehicle-mounted camera to be switched to the nighttime mode, and information indicating the daytime mode or the nighttime mode is temporarily stored in the memory.
Example three.
This embodiment has contained the whole content of above-mentioned embodiment, combines fig. 3, fig. 4, this embodiment the short wave pass filter constitutes an tourniquet, the tourniquet is installed on the ring rail, prefilter switches the driver and can control the tourniquet is in move on the ring rail, the tourniquet is equally cut into a plurality of infrared filter and a full transmission spectrum light filter, and every infrared filter is equipped with different filtration boundary lambdadThe wavelength interval of the light which can be transmitted by the infrared filter is (0, lambda)d) The wavelength range of the light which can be transmitted by the long-wave pass filter is (lambda)c, + ∞) of the infrared filter or the full-transmission spectral filter and the long-wave pass filter form a band-pass filter unit in combination such that the wavelength is at (λ)c，λd) The light in the infrared filter can pass through the filter, and the infrared wavelength range which can be transmitted is controlled by selecting different infrared filters on the optical axis;
if the filtering boundary lambda of different infrared filtersdBy λ1、λ2、...、λnWherein n represents the number of the infrared filters on the circular ring belt, the filtration boundary lambda of the ith infrared filteriThe method comprises the following steps:
wherein λ is0The critical wavelength of infrared light and visible light, and delta lambda is the basic bandwidth;
with reference to fig. 5, the light intensity of the transmitted light can be controlled by the polarization angle θ of the polarization filter, and the percentage η between the transmitted light intensity and the original light intensity is:
η＝(cosθ)2；
controlling short-wavelength illumination, selection of an infrared filter and a polarization angle of a polarization filter according to the illumination information detected by the illumination sensor, thereby improving the imaging quality of the camera system;
when the illumination information I detected by the illumination sensor is lower than a threshold value I', enabling the short-wavelength illumination, selecting a full-transmission spectral filter in a circular ring band, setting the polarization angle theta of the polarization filter to be 0 DEG, and enabling the number n of the short-wavelength illuminationdComprises the following steps:
wherein, I0The illumination intensity of single short-wavelength illumination, k is a compensation coefficient;
when the illumination information I detected by the illumination sensor is higher than a threshold value I', the short-wavelength illumination is turned off, the appropriate infrared filter in the circular ring band and the polarization angle theta of the polarization filter are selected, and the filtering boundary lambda of the selected infrared filter isd' is:
wherein, the expression of the intermediate parameter u is:
wherein k isIIs a base bandwidth factor;
the calculation formula of the polarization angle theta of the polarization filter is as follows:
the incident light in the daytime mode is weakened by controlling the wavelength range and the polarization angle of the transmitted light, so that the light entering the camera system is closer to ideal imaging light, and the final imaging quality is improved.
Although the invention has been described above with reference to various embodiments, it should be understood that many changes and modifications may be made without departing from the scope of the invention. That is, the methods, systems, and devices discussed above are examples. Various configurations may omit, substitute, or add various procedures or components as appropriate. For example, in alternative configurations, the methods may be performed in an order different than that described, and/or various components may be added, omitted, and/or combined. Moreover, features described with respect to certain configurations may be combined in various other configurations, as different aspects and elements of the configurations may be combined in a similar manner. Further, elements therein may be updated as technology evolves, i.e., many elements are examples and do not limit the scope of the disclosure or claims.
Specific details are given in the description to provide a thorough understanding of the exemplary configurations including implementations. However, configurations may be practiced without these specific details, for example, well-known circuits, processes, algorithms, structures, and techniques have been shown without unnecessary detail in order to avoid obscuring the configurations. This description provides example configurations only, and does not limit the scope, applicability, or configuration of the claims. Rather, the foregoing description of the configurations will provide those skilled in the art with an enabling description for implementing the described techniques. Various changes may be made in the function and arrangement of elements without departing from the spirit or scope of the disclosure.
In conclusion, it is intended that the foregoing detailed description be regarded as illustrative rather than limiting, and that it be understood that these examples are illustrative only and are not intended to limit the scope of the invention. After reading the description of the invention, the skilled person can make various changes or modifications to the invention, and these equivalent changes and modifications also fall into the scope of the invention defined by the claims.
Claims (5)
1. An IR-CUT-based light intensity self-adaptive camera system is characterized by comprising a processor, an imaging subsystem and a filtering subsystem, wherein the filtering subsystem is used for detecting and improving incident light rays, the imaging subsystem is used for forming images according to the incident light rays, and the processor is used for processing data detected by the filtering subsystem and controlling the filtering subsystem;
the filtering subsystem comprises an illuminance sensor, a wavelength filtering module and a polarization filtering module, wherein the illuminance sensor is used for detecting the illumination intensity I of light rays entering the camera system, and the wavelength filtering module is used for controlling the wavelength range (lambda) of the light rays entering the imaging subsystemc，λd) The polarization filtering module is used for controlling the illumination intensity entering the imaging subsystem;
controlling lambda when the illumination intensity I is larger than a threshold value IdComprises the following steps:
wherein λ is0The critical wavelength of infrared light and visible light, Δ λ is the basic bandwidth, and the expression of the intermediate parameter u is:
wherein k isIIs a base bandwidth factor;
controlling the polarization angle theta of the polarization filtering module to be:
wherein the boundary λ 'is filtered'dComprises the following steps:
2. an IR-CUT based light intensity adaptive camera system according to claim 1, wherein the wavelength filtering module comprises a front filter switching module and a front filter switching driver, the front filter switching module comprises a band-pass filtering unit, the band-pass filtering unit comprises a short-wave pass filter and a long-wave pass filter, the long-wave pass filter is fixed on the optical axis, the front filter switching driver comprises a circuit for driving a motor of the front filter switching module, and the front filter switching driver moves the short-wave pass filter by driving a motor of the front filter switching module according to a control instruction of the processor, so that the required short-wave pass filter is on the optical axis.
3. An IR-CUT based adaptive camera system according to claim 2, wherein the short wave pass filter comprises n different IR filters, and the filtering boundary of the IR filter is defined by λ1、λ2、..、λnIndicates the filtering boundary lambda of the ith infrared external filteriThe method comprises the following steps:
4. the IR-CUT-based light intensity adaptive image capturing system according to claim 3, wherein the polarization filtering module comprises a polarization filter rotation driver constituted by a circuit for driving a polarization filter rotating motor and rotating a polarization axis of a polarization filter disposed on an optical axis by a predetermined angle, and a polarization filter.
5. An IR-CUT based adaptive illumination camera system according to claim 4, wherein said camera system further comprises short wavelength illumination, when said illumination intensity I is less than a threshold I', the amount of light suitable for imaging is compensated by enabling short wavelength illumination.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102997996A (en) * | 2012-11-30 | 2013-03-27 | 中国科学院上海技术物理研究所 | Shortwave infrared day and night remote multispectral imager and imaging method |
| CN103945201A (en) * | 2013-01-21 | 2014-07-23 | 浙江大华技术股份有限公司 | IR-Cut optical filter switching method, device and camera |
| WO2021034002A1 (en) * | 2019-08-16 | 2021-02-25 | 경북대학교 산학협력단 | Device and method for acquiring multi-luminosity images |
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| US8781266B2 (en) * | 2011-12-23 | 2014-07-15 | General Electric Company | Distributed, multiplexed fiber optic current transducer using optical power division |
| JP6793857B2 (en) * | 2017-11-27 | 2020-12-02 | 三菱電機株式会社 | Monitoring device |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102997996A (en) * | 2012-11-30 | 2013-03-27 | 中国科学院上海技术物理研究所 | Shortwave infrared day and night remote multispectral imager and imaging method |
| CN103945201A (en) * | 2013-01-21 | 2014-07-23 | 浙江大华技术股份有限公司 | IR-Cut optical filter switching method, device and camera |
| WO2021034002A1 (en) * | 2019-08-16 | 2021-02-25 | 경북대학교 산학협력단 | Device and method for acquiring multi-luminosity images |
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