CN110572583A - method for shooting image and camera - Google Patents
method for shooting image and camera Download PDFInfo
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- CN110572583A CN110572583A CN201810479029.0A CN201810479029A CN110572583A CN 110572583 A CN110572583 A CN 110572583A CN 201810479029 A CN201810479029 A CN 201810479029A CN 110572583 A CN110572583 A CN 110572583A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/45—Cameras or camera modules comprising electronic image sensors; Control thereof for generating image signals from two or more image sensors being of different type or operating in different modes, e.g. with a CMOS sensor for moving images in combination with a charge-coupled device [CCD] for still images
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/73—Circuitry for compensating brightness variation in the scene by influencing the exposure time
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—Circuitry for compensating brightness variation in the scene
- H04N23/74—Circuitry for compensating brightness variation in the scene by influencing the scene brightness using illuminating means
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/95—Computational photography systems, e.g. light-field imaging systems
- H04N23/951—Computational photography systems, e.g. light-field imaging systems by using two or more images to influence resolution, frame rate or aspect ratio
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N25/00—Circuitry of solid-state image sensors [SSIS]; Control thereof
- H04N25/60—Noise processing, e.g. detecting, correcting, reducing or removing noise
- H04N25/62—Detection or reduction of noise due to excess charges produced by the exposure, e.g. smear, blooming, ghost image, crosstalk or leakage between pixels
Abstract
the invention provides a method for shooting images and a camera, which relate to the technical field of image processing, and the method comprises the following steps: carrying out light splitting treatment on the received composite light to obtain visible light and infrared light; receiving the visible light on a first image sensor, and acquiring a first image according to a first shutter speed; receiving the infrared light on a second image sensor, and acquiring a second image according to a second shutter speed, wherein the first shutter speed is greater than the second shutter speed; and carrying out image fusion on the first image and the second image which are acquired simultaneously to obtain a target image. The invention can fully utilize infrared light which can not be sensed by human eyes under the condition of weak visible light, and the obtained image has higher brightness and definition and more identifiable information while maintaining the original color restoration.
Description
Technical Field
The present invention relates to the field of image processing technologies, and in particular, to a method for capturing an image and a camera.
Background
With the development of science and technology, cameras have become indispensable tools. The camera can be used for a series of security activities such as security inspection, real-time control, investigation and evidence obtaining, and provides a lot of convenience for people. For example, a camera on a road captures a target vehicle by monitoring the vehicle on the road surface, so that the target vehicle can be identified according to the shot pictures in the subsequent process. In order to accurately identify the vehicle, it is necessary to ensure that the license plate number of the vehicle, the information related to the body of the vehicle, and the details of the environment around the vehicle can be identified in the photographed picture. When the ambient brightness is low, for example, at night, the shutter speed is generally increased during shooting to prevent the problem that the license plate information cannot be identified due to vehicle trailing, but when the shutter speed is high, the brightness of the image is low, and the monitoring details related to the vehicle body and the environment cannot be identified.
In order to solve the above problems, at present, a high-power visible light supplement lamp is usually installed as an auxiliary light source to improve the ambient brightness, so that the situation that the monitoring details in the image cannot be identified due to low ambient brightness is solved.
In the process of implementing the invention, the inventor finds that at least the following problems exist in the prior art:
The visible light supplement lamp has strong illumination, is easy to cause light pollution and interferes the life of nearby residents; and the light filling lamp easily produces the amazing to the eyes, causes the influence to driver's normal driving.
Disclosure of Invention
in view of the above, the present invention provides a method for capturing an image and a camera, so as to obtain an image with more recognizable information in an environment with weak visible light.
Specifically, the method comprises the following technical scheme:
In a first aspect, the present invention provides a method of capturing an image, comprising:
carrying out light splitting treatment on the received composite light to obtain visible light and infrared light;
receiving the visible light on a first image sensor, and acquiring a first image according to a first shutter speed;
Receiving the infrared light on a second image sensor, and acquiring a second image according to a second shutter speed, wherein the first shutter speed is greater than the second shutter speed;
And carrying out image fusion on the first image and the second image which are acquired simultaneously to obtain a target image.
optionally, the method further comprises:
And carrying out infrared light supplement on the shooting scene.
Optionally, the method further comprises:
and synchronously performing infrared supplementary lighting on the shooting scene during the exposure of the second image sensor.
Optionally, the method further comprises:
and controlling the first image sensor and the second image sensor to synchronously expose.
Optionally, the method further comprises:
Before the first image is acquired according to the first shutter speed, adjusting the shutter speed corresponding to the first image sensor until first target information identified in a picture formed by the first image sensor sensing visible light meets a first preset condition, and then setting the corresponding shutter speed as the first shutter speed; and/or the presence of a gas in the gas,
before the second image is acquired according to the second shutter speed, the shutter speed corresponding to the second image sensor is adjusted until second target information identified in a picture formed by the second image sensor sensing infrared light meets a second preset condition, and then the corresponding shutter speed is set as the second shutter speed.
Optionally, before image fusing the first image and the second image acquired simultaneously, the method further includes:
processing the first image to improve the color reduction degree; and/or the presence of a gas in the gas,
And performing definition improving processing on the second image.
In a second aspect, the present invention provides a camera comprising a beam splitter, a first image sensor, a second image sensor, and an image processor, wherein,
the spectroscope is used for separating the received composite light into visible light and infrared light, transmitting the visible light to the first image sensor and transmitting the infrared light to the second image sensor;
the first image sensor is used for receiving the visible light, acquiring a first image according to a first shutter speed and sending the first image to the image processor;
The second image sensor is used for receiving the infrared light, acquiring a second image according to a second shutter speed and sending the second image to the image processor, wherein the first shutter speed is greater than the second shutter speed;
the image processor is configured to perform image fusion on the first image and the second image that are acquired simultaneously to obtain a target image.
Optionally, the camera further includes a fill-in light lamp for performing infrared fill-in light on the shooting scene.
Optionally, the camera further includes a light supplement lamp and a main controller, and the main controller is configured to control the light supplement lamp to perform infrared light supplement on a shooting scene synchronously when the second image sensor is exposed.
optionally, the camera further comprises a main controller for controlling the first image sensor and the second image sensor to be synchronously exposed.
Optionally, the camera further comprises a master controller for:
Before the first image sensor acquires a first image according to a first shutter speed, adjusting the shutter speed corresponding to the first image sensor until first target information identified by the image processor in a picture formed by the first image sensor sensing visible light meets a first preset condition, and setting the corresponding shutter speed as the first shutter speed; and/or the presence of a gas in the gas,
Before the second image sensor acquires a second image according to a second shutter speed, adjusting the shutter speed corresponding to the second image sensor until second target information identified by the image processor in a picture formed by the second image sensor sensing infrared light meets a second preset condition, and setting the corresponding shutter speed as the second shutter speed.
Optionally, before image fusing the first and second images acquired simultaneously, the image processor is further configured to:
Processing the first image to improve the color reduction degree; and/or the presence of a gas in the gas,
And performing definition improving processing on the second image.
The technical scheme provided by the embodiment of the invention has the beneficial effects that:
According to the method and the camera for shooting the image, provided by the invention, the received composite light is subjected to light splitting processing to obtain the infrared light and the visible light, so that the first image sensor receives the visible light and obtains a first image according to a first shutter speed, the second image sensor receives the infrared light and obtains a second image according to a second shutter speed, and finally, the first image and the second image which are obtained simultaneously are subjected to image fusion to obtain the target image. The first shutter speed is greater than the second shutter speed, so that the brightness of the first image is greater, and the first image is a color image, and the color and the shape of a shot object can be recognized; and the corresponding shutter speed in the second image is lower, so that no tailing occurs in the image, and the identification of the details of the area with better infrared light reflection characteristics is facilitated. The method, the camera device and the camera provided by the invention can fully utilize infrared light which can not be sensed by human eyes under the condition of weak visible light without supplementing visible light to cause light pollution to the environment, the obtained image has higher brightness and definition and more identifiable information while maintaining the original color restoration, and is beneficial to identifying the color, the shape and other details of an object, and particularly can identify the information such as characters recorded by the image, such as a license plate and the like, in an area with better light reflection property.
drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart of a method for capturing an image according to an embodiment of the present invention;
FIG. 2 is a flowchart of a method for capturing images according to another embodiment of the present invention;
fig. 3 is a schematic diagram of a hardware structure of a camera according to an embodiment of the present invention.
Detailed Description
In order to make the technical solutions and advantages of the present invention clearer, the following will describe embodiments of the present invention in further detail with reference to the accompanying drawings.
Embodiments of the present invention are applied, for example, to a camera having two image sensors, each having a shutter for controlling its shutter speed, which may be a mechanical shutter or an electronic shutter. The camera comprises a lens, a spectroscope is arranged behind the lens, the spectroscope performs light splitting processing on composite light received by the lens to obtain visible light and infrared light, the visible light is sent to one image sensor, and the infrared light is sent to the other image sensor. The camera is also provided with an image fusion function, and images acquired by the two image sensors can be fused to obtain a target image.
Fig. 1 is a flowchart of a method for capturing an image according to an embodiment of the present invention, and referring to fig. 1, the method includes:
102, performing light splitting treatment on the received composite light to obtain visible light and infrared light;
104, receiving visible light on a first image sensor, and acquiring a first image according to a first shutter speed;
106, receiving the infrared light on a second image sensor, and acquiring a second image according to a second shutter speed, wherein the first shutter speed is greater than the second shutter speed;
And 108, carrying out image fusion on the first image and the second image which are acquired simultaneously to obtain a target image.
The simultaneous acquisition of the images by the first image sensor and the second image sensor does not mean that the processes of acquiring the images by the two image sensors are completely synchronous from beginning to end, but in terms of time sequence, the time of acquiring the first image by the first image sensor and the time of acquiring the second image by the second image sensor are relatively close, and the images can be regarded as being simultaneous. For example, although the shutter speeds of the first and second image sensors are different, if the first and second image sensors acquire the same number of images in the same second, the camera may consider the images in the same order to be acquired simultaneously. In order to obtain the first image and the second image which are fused correspondingly, steps 102 and 103 may be performed simultaneously or slightly sequentially, as long as the time difference does not affect the real-time scene restoration or distort the images. In the method for shooting an image provided by the embodiment of the invention, the camera performs a light splitting process on the received composite light to obtain infrared light and visible light, so that the first image sensor receives the visible light and obtains a first image according to a first shutter speed, the second image sensor receives the infrared light and obtains a second image according to a second shutter speed, and finally, the first image and the second image which are simultaneously obtained are subjected to image fusion to obtain a target image. The first shutter speed is greater than the second shutter speed, so that the brightness of the first image is greater, and the first image is a color image, and the color and the shape of a shot object can be recognized; and the corresponding shutter speed in the second image is lower, so that no tailing occurs in the image, and the identification of the details of the area with better infrared light reflection characteristics is facilitated. The method provided by the embodiment of the invention can fully utilize infrared light which can not be sensed by human eyes under the condition of not supplementing visible light, does not need to supplement visible light to cause light pollution to the environment, and can be used for identifying the color, the shape and other details of an object, particularly identifying the information such as the characters recorded by the area with better light reflection characteristics, such as a license plate and the like, while keeping the original color reduction of the acquired image.
In the present application, the shutter speed is expressed in terms of time, and therefore, the fact that the first shutter speed is greater than the second shutter speed means that the time representing the first shutter speed is greater than the time representing the second shutter speed, that is, the duration of one-time open state of the shutter corresponding to the first image sensor is greater than the duration of one-time open state of the shutter corresponding to the second image sensor.
Wherein, the method can also comprise: and carrying out infrared light supplement on the shooting scene.
Wherein, the method can also comprise: and synchronously performing infrared light supplement on the shooting scene when the second image sensor is exposed.
Wherein, the method can also comprise: and controlling the first image sensor and the second image sensor to synchronously expose.
wherein, the method can also comprise: before a first image is acquired according to a first shutter speed, adjusting the shutter speed corresponding to a first image sensor until first target information identified in a picture formed by the first image sensor sensing visible light meets a first preset condition, and then setting the corresponding shutter speed as the first shutter speed; and/or the presence of a gas in the gas,
And before acquiring a second image according to the second shutter speed, adjusting the shutter speed corresponding to the second image sensor until second target information identified in a picture formed by the second image sensor sensing the infrared light meets a second preset condition, and then setting the corresponding shutter speed as the second shutter speed.
Before image fusion is performed on the first image and the second image acquired simultaneously, the method may further include:
carrying out processing for improving color reduction degree on the first image; and/or the presence of a gas in the gas,
And performing sharpness improving processing on the second image.
all the above-mentioned optional technical solutions can be combined arbitrarily to form the optional embodiments of the present invention, and are not described herein again.
fig. 2 is a flowchart of a method for capturing an image according to another embodiment of the present invention. The method is performed by a camera, see fig. 2, the method comprising:
Step 201, performing infrared light supplement on a shooting scene.
in order to increase the brightness of the second image acquired by the second image sensor, the identification of the second target information in the second image is facilitated, and infrared supplementary lighting can be performed on the shooting scene.
For example, an infrared fill-in light may be provided in the camera, and the infrared fill-in light emits infrared light or near infrared light to fill in the light of the shooting scene.
the camera can perform infrared light supplement on a shooting scene in the following two ways.
in the first mode, infrared light supplement is continuously carried out on a shooting scene during shooting.
In the second mode, infrared light supplement is synchronously carried out on a shooting scene when the second image sensor is exposed.
Generally, in the first mode, the infrared fill-in light is always operated at a constant power, for example, and is suitable for a situation where the camera needs to continuously acquire the second image.
In the second mode, the infrared light supplement lamp is started only when the camera acquires the second image, so that light supplement is performed with high power, and the infrared light supplement lamp is suitable for the situation that the camera acquires the second image at intervals. In this embodiment, the camera may start the infrared fill-in light while controlling to open the shutter corresponding to the second image sensor, so as to synchronously perform infrared fill-in light on the shooting scene when the second image sensor is exposed.
when the infrared light supplement device is used, an infrared light supplement mode can be selected according to actual conditions. If the infrared light intensity in the shooting scene meets the shooting requirement or has other infrared light sources, the infrared light supplement is not needed to be additionally carried out during shooting.
the wavelength range of infrared rays emitted by the infrared light supplement lamp is 730-950 nm, and 730nm, 850nm or 940nm can be selected according to the light reflection characteristics of different license plates.
the camera carries out infrared supplementary lighting on the shooting scene to improve the brightness of the acquired second image, so that the second image sensor can carry out shooting according to a smaller second shutter speed and can also ensure the brightness of the second image; meanwhile, when the second shutter speed is low, the trailing of the picture can be avoided, and the identification of second target information is facilitated; and the human eyes can not perceive the infrared light, so that the problem of light pollution caused by light supplement by adopting visible light can be solved.
step 202, performing light splitting processing on the received composite light to obtain visible light and infrared light.
In this embodiment, a light splitting element is provided in the camera, and this step may be performed by the light splitting element in the camera. The light splitting element can be a light splitter or other devices capable of performing light splitting operation. The light-splitting element is generally disposed behind the lens of the camera, and performs light-splitting processing on light received by the lens by using a dispersion phenomenon, for example.
When the light splitting element is a light splitter, the light splitter splits the composite light into infrared light and visible light according to the principle that the refractive indexes of light with different wavelengths are different. The infrared light is light which cannot be sensed by human eyes, and the visible light is light which can be sensed by human eyes.
it is to be understood that, in the present embodiment, this step is necessarily required whenever an image is captured to acquire an image, and it is required to perform exposure imaging using this step both when the shutter speed is adjusted and when the image is acquired formally.
Step 203, adjusting the shutter speed corresponding to the first image sensor until the first target information identified in the picture formed by the first image sensor sensing the visible light meets a first preset condition, and setting the corresponding shutter speed as the first shutter speed.
the first target information may be a shape and a color of the monitored target object and an environment around the target object. For example, the monitored target object may be a vehicle. In a certain range, the higher the shutter speed corresponding to the first image sensor is, the higher the brightness of the first image acquired by the camera is, and the more truly the first target information in the first image can reflect the monitored object and the surrounding environment thereof. However, when the shutter speed is too high, the first image may be smeared, which may affect the recognition of the first target information. Therefore, in order to ensure that the first target information can be accurately identified in the first image acquired by the camera, the shutter speed corresponding to the first image sensor needs to be adjusted before the first image is acquired.
the shutter speed corresponding to the first image sensor is automatically adjusted by the camera. The process of the camera automatically adjusting the shutter speed corresponding to the first image sensor may be as follows: the camera shoots an image in a specific scene, compares first target information identified in a picture formed by the first image sensor sensing visible light with corresponding reference information, and judges whether the first target information in the picture formed by the first image sensor sensing visible light is matched with the corresponding reference information. Wherein the reference information reflects information of a target object in the specific scene. If the first target information in the picture formed by the first image sensor sensing the visible light is not matched with the corresponding reference information, the camera adjusts the shutter speed until the first target information in the picture formed by the first image sensor sensing the visible light is matched with the corresponding reference information, so that the first target information can be determined to meet a first preset condition, and the corresponding shutter speed is used as the first shutter speed. The specific scene can be selected as an actual scene which is not beneficial to identification and has dark light and a vehicle passing through at a certain speed, and the shutter speed which enables the identified first target information to accord with the preset condition obviously has better applicability and can be used as the first shutter speed. Specifically, if the first target information identified by the camera in the picture formed by the first image sensor sensing the visible light is not matched with the corresponding reference information at the current shutter speed corresponding to the first image sensor, the camera may increase the shutter speed; if the first target information identified by the camera in the picture formed by the first image sensor sensing the visible light still does not match the corresponding reference information after the shutter speed corresponding to the first image sensor is increased, the shutter speed corresponding to the first image sensor continues to be increased. And setting the corresponding shutter speed as the first shutter speed corresponding to the first image sensor until the first target information identified by the camera in the picture formed by the first image sensor sensing the visible light is matched with the corresponding reference information.
If the shutter speed of the first image sensor is increased to a preset value, the camera adjusts the shutter speed of the first image sensor to the initial shutter speed and gradually reduces the shutter speed corresponding to the first image sensor if the first target information identified by the camera in the picture formed by the first image sensor sensing the visible light is not matched with the corresponding reference information. If the first target information identified by the camera in the picture formed by the first sensor sensing the visible light still does not match the reference value after the shutter speed corresponding to the first image sensor is reduced for the first time, the camera continues to reduce the shutter speed corresponding to the first image sensor. And setting the corresponding shutter speed as the first shutter speed corresponding to the first image sensor until the first target information identified by the camera in the picture formed by the first image sensor sensing the visible light is matched with the corresponding reference information.
For example, a camera is used to photograph a vehicle passing through a certain road. The camera recognizes first object information, which may be a shape, a color, and an environment around the vehicle, in a picture formed by the first image sensor sensing the visible light. In a shooting scene with low ambient brightness, such as at night, the camera adjusts the first shutter speed corresponding to the first image sensor until the shape and color of the vehicle and the environment around the vehicle are recognized to be matched with the corresponding reference information in a picture formed by the first image sensor sensing visible light, and then the corresponding shutter speed is set as the first shutter speed, and at the moment, the shape and color of the vehicle and the environment around the vehicle recognized in the first image acquired by the camera in the shooting scene truly reflect the shape, color and environment around the vehicle.
the first shutter speed corresponding to the first image sensor may also be manually adjusted by a user. Specifically, the user determines whether the current shutter speed is appropriate by observing a picture formed by the first image sensor sensing the visible light at the current shutter speed. If the brightness of a picture formed by sensing visible light by the first image sensor is too low at the current shutter speed corresponding to the first image sensor, so that the first target information cannot be identified, or the identified first target information is not matched with the real first target information, adjusting a shutter corresponding to the first image sensor by a user, and increasing the shutter speed corresponding to the first image sensor; if the user increases the shutter speed corresponding to the first image sensor, the image formed by the first image sensor sensing the visible light is still too dark, so that the first target information cannot be identified, or the identified first target information is not matched with the real first target information, the user adjusts the shutter corresponding to the first image sensor again, and continues to increase the shutter speed corresponding to the first image sensor until the camera can accurately identify the first target information in the image formed by the first image sensor sensing the visible light, that is, it is determined that the first target information in the image formed by the first image sensor sensing the visible light is matched with the corresponding reference information, a first preset condition is met, and the corresponding shutter speed is set as the first shutter speed corresponding to the first image sensor.
If the brightness of a picture formed by sensing visible light by the first image sensor is high at the current shutter speed corresponding to the first image sensor, but the first target information cannot be identified due to trailing of the picture, or the identified first target information is not matched with the real first target information, the user adjusts the shutter corresponding to the first image sensor and reduces the shutter speed corresponding to the first image sensor; if the user reduces the shutter speed corresponding to the first image sensor, the trailing of the picture formed by the first image sensor sensing the visible light still occurs, so that the user cannot identify the first target information, or the identified first target information is not matched with the real first target information, the user adjusts the shutter corresponding to the first image sensor again, and the shutter speed corresponding to the first image sensor continues to be reduced. Until the user can accurately identify the first target information in the picture formed by the first image sensor sensing the visible light, namely, the first target information in the picture formed by the first image sensor sensing the visible light is determined to be matched with the corresponding reference information, and the corresponding shutter speed is set as the first shutter speed corresponding to the first image sensor.
and 204, adjusting the shutter speed corresponding to the second image sensor until second target information identified in a picture formed by the second image sensor sensing the infrared light meets a second preset condition, and setting the corresponding shutter speed as a second shutter speed.
the second target information may be digital or text information on the monitored target object, for example, a license plate number of a vehicle. The higher the shutter speed corresponding to the second image sensor is, the higher the brightness of the second image acquired by the camera is, which is beneficial to the identification of the second target information. However, when the shutter speed corresponding to the second image sensor is too high, the second target information in the second image may be smeared, which affects the identification of the second target information. Therefore, in order to ensure that the second target information is recognized in the second image acquired by the camera, the shutter speed corresponding to the second image sensor needs to be adjusted before the second image is acquired.
The shutter speed corresponding to the second image sensor can be automatically adjusted by the camera. The process of the camera automatically adjusting the shutter speed corresponding to the second image sensor may be as follows: the camera shoots an image in a specific scene, second target information identified in a picture formed by the second image sensor sensing infrared light is compared with corresponding reference information, and whether the second target information formed in the picture formed by the second image sensor sensing infrared light is matched with the corresponding reference information is judged. If the second target information in the picture formed by the second image sensor sensing the infrared light is not matched with the corresponding reference information, the camera adjusts the shutter speed until the second target information in the picture formed by the second image sensor sensing the infrared light is matched with the corresponding reference information, so that the second target information can be determined to meet a second preset condition, and the corresponding shutter speed is used as the second shutter speed. The specific scene may be selected as an actual scene which is not easy to recognize, such as a scene in which the vehicle passes through at a certain speed and the light is dark, and the shutter speed at which the recognized second target information meets the preset condition is obviously better applicable, and thus can be used as the second shutter speed.
Specifically, if the second target information identified by the camera in the picture formed by the second image sensor sensing infrared light does not match with the corresponding reference information at the current shutter speed corresponding to the second image sensor, the camera may increase the shutter speed; and if the second target information identified by the camera in the picture formed by the infrared light sensed by the second image sensor is still not matched with the corresponding reference information after the shutter speed corresponding to the second image sensor is increased, continuously increasing the shutter speed corresponding to the second image sensor. And setting the corresponding shutter speed as the second shutter speed corresponding to the second image sensor until the second target information identified by the camera in the picture formed by the second image sensor sensing the infrared light is matched with the corresponding reference information.
If the shutter speed of the second image sensor is increased to a preset value, the camera adjusts the shutter speed of the second image sensor to the initial shutter speed and gradually reduces the shutter speed corresponding to the second image sensor if the second target information identified by the camera in the picture formed by the infrared light sensed by the second image sensor is not matched with the corresponding reference information. If the second target information identified by the camera in the picture formed by the infrared light sensed by the second sensor still does not match the corresponding reference information after the shutter speed corresponding to the second image sensor is reduced for the first time, the camera continues to reduce the shutter speed corresponding to the second image sensor. And setting the corresponding shutter speed as the second shutter speed corresponding to the second image sensor until the second target information identified by the camera on the picture formed by the infrared light sensed by the second image sensor is matched with the corresponding reference information.
For example, a camera is used to photograph a vehicle passing through a certain road. The camera identifies second target information in a picture formed by the second image sensor sensing the infrared light, and the second target information in the second image can be a license plate number of the vehicle. In a shooting scene with low ambient brightness, such as at night, the camera needs to adjust a second shutter speed corresponding to the second image sensor until the license plate number of the vehicle identified in a picture formed by the infrared light sensed by the second image sensor is matched with a preset license plate number, and then the corresponding shutter speed is set as the second shutter speed, so that the license plate number of the vehicle can be accurately identified in a second image acquired by the camera in the scene.
The second shutter speed corresponding to the second image sensor may also be manually adjusted by the user. Specifically, the user determines whether the current shutter speed is appropriate by observing a picture formed by the second image sensor sensing infrared light at the current shutter speed. If the brightness of the picture formed by the second image sensor sensing infrared light is too dark under the current shutter speed corresponding to the second image sensor, so that the user cannot identify the second target information, or the identified second target information is not matched with the real second target information, the user adjusts the shutter corresponding to the second image sensor, and the shutter speed corresponding to the second image sensor is increased; if the user increases the shutter speed corresponding to the second image sensor, the picture formed by the second image sensor sensing the infrared light is still too dark, so that the user cannot identify the second target information, or the identified second target information is not matched with the real second target information, the user adjusts the shutter corresponding to the second image sensor again, and the shutter speed corresponding to the second image sensor continues to be increased. Until the camera can accurately identify the second target information in the picture formed by the infrared light sensed by the second image sensor, that is, the second target information in the picture formed by the infrared light sensed by the second image sensor is determined to be matched with the corresponding reference information, so that a second preset condition is met, and the corresponding shutter speed is set as the second shutter speed corresponding to the second image sensor.
If the brightness of the picture formed by the second image sensor sensing the infrared light is large at the current shutter speed corresponding to the second image sensor, but the second target information cannot be identified due to the trailing of the picture, or the identified second target information is not matched with the real second target information, the shutter corresponding to the second image sensor is adjusted by the user, and the shutter speed corresponding to the second image sensor is reduced. If the user reduces the shutter speed corresponding to the second image sensor, the image formed by the infrared light sensed by the second image sensor still has trailing, so that the second target information cannot be identified, or the identified second target information is not matched with the real second target information, the user adjusts the shutter corresponding to the second image sensor again, and the shutter speed corresponding to the second image sensor continues to be reduced. Until the user can accurately identify the second target information in the picture formed by the infrared light sensed by the second image sensor, that is, the second target information in the picture formed by the infrared light sensed by the second image sensor is determined to be matched with the corresponding reference information, so that a second preset condition is met, and the corresponding shutter speed is set as the second shutter speed corresponding to the second image sensor.
in the embodiment of the present invention, the first image acquired by the camera is a color image, and the first target information includes color, so that it is necessary to ensure that the brightness of the first image is large in order to distinguish the first target information.
The second image acquired by the camera is a black and white image. The carrier of the second target information is generally characters or numbers with good infrared light reflecting performance, the color of the carrier is not required to be identified when the second target information is identified, and the characters or numbers in the black-white image are easy to identify, so that the brightness of the second image can be lower than that of the first image, but in order to distinguish the characters or numbers clearly, the trailing of the second target cannot occur.
the good reflection characteristic for infrared light means that the reflectivity for infrared light is high, and the energy of the reflected infrared light is high. When the infrared light irradiates an object with good infrared light reflection performance, the energy of the infrared light received by the lens and reflected back is high, so that the brightness in a second image formed by the second image sensor sensing the infrared light can meet the requirement of identifying second target information.
It can be seen that the first shutter speed corresponding to the first image sensor is greater than the second shutter speed corresponding to the second image sensor. For example, in practice, the first shutter speed may be set to 1/25 seconds, 1/100 seconds, and the second shutter speed may be set to 1/200 seconds, 1/300 seconds, or even 1/1000 seconds.
Step 203 and step 204 may be performed simultaneously, or one of the steps may be performed first and then the other step may be performed.
step 205, receiving visible light on a first image sensor, and acquiring a first image according to a first shutter speed.
the image sensor utilizes the photoelectric conversion function of the photoelectric device to convert the light image on the light-sensitive surface into an 'image' electric signal which is in corresponding proportional relation with the light image.
the first image sensor of the camera receives visible light and the first image obtained is a color image, so that the color of the object is recognizable in the first image.
For example, when the vehicle is photographed, the color of the vehicle and the color of the markers in the surrounding environment can be recognized from the first image.
in this embodiment, the camera may store the acquired first image for subsequent viewing and processing.
step 206, receiving the infrared light at the second image sensor, and acquiring a second image according to a second shutter speed.
The second image sensor of the camera receives the infrared light, the obtained second image is a black-and-white image, and generally, the carrier of the second target information is characters or numbers, which are relatively easy to identify in the black-and-white image.
For example, when the vehicle is photographed, the license plate number of the vehicle can be identified from the second image, so that the license plate number is more persuasive when investigation and evidence collection are performed subsequently.
in this embodiment, the camera may store the acquired second image for subsequent viewing and processing.
In order to ensure that the first image and the second image are the same object taken simultaneously, step 205 and step 206 are performed simultaneously. Correspondingly, the camera may include a main controller that may control the first image sensor and the second image sensor to acquire the first image and the second image synchronously.
of course, the first image and the second image acquired by the camera may also include shooting time information, so that the camera may also determine that the first image and the second image are two images acquired simultaneously according to the shooting time.
In order to obtain the first image and the second image which are fused correspondingly, steps 205 and 206 may be performed simultaneously or slightly in sequence, as long as the time difference does not affect the real-time scene restoration or distort the images.
and step 207, performing color reduction improvement processing on the first image, and performing definition improvement processing on the second image.
in order to facilitate a user who watches the image to observe a clear target from the image, the camera can process the first image, improve the color reduction degree of the first image, process the second image and improve the definition of the second image, so that the identification degree of object information in the image is improved, and useful information can be extracted from the image more conveniently.
in this embodiment, for example, a color correction method may be used to improve the color rendition of the first image, and an image sharpening method may be used to improve the sharpness of the second image.
And 208, performing image fusion on the first image and the second image which are acquired simultaneously to obtain a target image.
In order to facilitate a user to view a plurality of targets in the same shooting scene, the camera can perform image fusion on the first image and the second image which are acquired simultaneously to obtain a target image, so that more identifiable information can be obtained in the target image. For example, the camera fuses the first image and the second image of the vehicle, and the obtained target image can distinguish the color, the shape and the environment around the vehicle as well as the license plate number of the vehicle, so that more distinguishable information is provided, and the user or the computer equipment can conveniently distinguish the vehicle and the scene.
The simultaneous acquisition of the images by the first image sensor and the second image sensor does not mean that the processes of acquiring the images are completely synchronous from beginning to end, but in terms of time sequence, the time for acquiring the first image by the first image sensor and the time for acquiring the second image by the second image sensor are relatively close, and the images can be regarded as being simultaneous. For example, although the shutter speeds of the first and second image sensors are different, if the first and second image sensors acquire the same number of images in the same second, the camera may consider the images in the same order to be acquired simultaneously. In this embodiment, the camera may select the first image and the second image to be simultaneously acquired according to the shooting time, and the camera may also control the first image sensor and the second image sensor to be synchronously exposed to simultaneously acquire the first image and the second image.
In the embodiment of the present invention, the camera may further communicate with an external device to transmit the acquired image to the external device in real time, and may further receive a control command and the like sent by the server in real time. Specifically, the camera may communicate with an external machine or server via a wireless network, such as WiFi, 2G, 3G, or 4G, etc.
In the method for shooting an image provided by the embodiment of the present invention, the camera performs a light splitting process on the received composite light to obtain the infrared light and the visible light, so that the first image sensor receives the visible light and obtains a first image according to a first shutter speed, the second image sensor receives the infrared light and obtains a second image according to a second shutter speed, and finally, the first image and the second image which are simultaneously obtained are subjected to image fusion to obtain a target image. The first shutter speed is greater than the second shutter speed, so that the brightness of the first image is greater, and the first image is a color image, and the color and the shape of a shot object can be recognized; and the corresponding shutter speed in the second image is lower, so that no tailing occurs in the image, and the identification of the details of the area with better infrared light reflection characteristics is facilitated. The method provided by the embodiment of the invention can fully utilize infrared light which can not be sensed by human eyes under the condition of weak visible light, does not need to supplement visible light to cause light pollution to the environment, and the obtained image has higher brightness and definition and more identifiable information while keeping the original color restoration, is favorable for identifying the color, the shape and other details of an object, and can particularly identify the information such as characters recorded by the image, such as a license plate and the like, in an area with better light reflection property.
Fig. 3 is a schematic diagram illustrating a hardware structure of a video camera 300 according to an embodiment. Referring to fig. 3, the camera 300 includes a beam splitter 301, a first image sensor 302, a second image sensor 303, an image processor 304, and a lens 305, wherein,
A spectroscope 301 disposed behind the lens 305, configured to split the composite light received by the lens 305 into visible light and infrared light, transmit the visible light to the first image sensor 302, and transmit the infrared light to the second image sensor 303;
A first image sensor 302 for receiving visible light, acquiring a first image according to a first shutter speed and sending the first image to an image processor 304;
the second image sensor 303 is configured to receive the infrared light, obtain a second image according to a second shutter speed, and send the second image to the image processor 304, where the first shutter speed is greater than the second shutter speed;
And the image processor 304 is configured to perform image fusion on the first image and the second image that are acquired simultaneously to obtain a target image.
the camera 300 may further include a fill-in light lamp 305, configured to perform infrared fill-in light on a shooting scene.
The camera 300 may further include a main controller 306, among other things.
The main controller 306 can be used to control the fill-in light lamp 305 to synchronously perform infrared fill-in light on the shooting scene when the second image sensor 303 is exposed. The main controller 306 may also be used to control the first image sensor 302 and the second image sensor 303 to be exposed synchronously.
The master controller 306 may also be used to:
Before the first image sensor 302 acquires the first image according to the first shutter speed, adjusting the shutter speed corresponding to the first image sensor 302 until first target information identified by the image processor 304 in a picture formed by the first image sensor 302 sensing visible light meets a first preset condition, and setting the corresponding shutter speed as the first shutter speed; and/or the presence of a gas in the gas,
Before the second image sensor 303 acquires the second image according to the second shutter speed, the shutter speed corresponding to the second image sensor 303 is adjusted until the second target information identified by the image processor 304 in the picture formed by the second image sensor 303 sensing the infrared light meets a second preset condition, and the corresponding shutter speed is set as the second shutter speed.
Before the image fusion is performed on the synchronously acquired first image and second image, the image processor 304 may be further configured to:
Carrying out processing for improving color reduction degree on the first image; and/or the presence of a gas in the gas,
And performing sharpness improving processing on the second image.
optionally, the camera 300 further comprises a memory 308 for storing the software program of the main controller 306, the images acquired by the first image sensor 302 and the second image sensor 303, and the target image processed by the image processor 304. The images acquired by the first image processor 302 and the second image sensor 303 and the target image processed by the image processor 304 are first sent to the main controller 306, and then sent to the memory 308 from the main controller 306.
optionally, the camera 300 further comprises a communication component 309 for wired or wireless communication between the camera device 300 and other devices. The image pickup apparatus 300 can access a wireless network based on a communication standard, such as WiFi, 2G, or 4G. Specifically, the main controller 306 may transmit an image it receives to a cloud server through the communication component 309, and the communication component 309 may transmit a received remote control command to the main controller 306.
Some technical implementation details of the foregoing embodiments are also applicable to this embodiment, and are not described herein again.
According to the camera provided by the embodiment of the invention, the received composite light is subjected to light splitting processing to obtain the infrared light and the visible light, so that the first image sensor receives the visible light and obtains a first image according to a first shutter speed, the second image sensor receives the infrared light and obtains a second image according to a second shutter speed, and finally, the first image and the second image which are obtained simultaneously are subjected to image fusion to obtain the target image. The first shutter speed is greater than the second shutter speed, so that the brightness of the first image is greater, and the first image is a color image, and the color and the shape of a shot object can be recognized; and the corresponding shutter speed in the second image is lower, so that no tailing occurs in the image, and the identification of the details of the area with better infrared light reflection characteristics is facilitated. The camera provided by the embodiment of the invention can fully utilize infrared light which can not be sensed by human eyes under the condition of weak visible light, does not need to supplement visible light to cause light pollution to the environment, and the obtained image has higher brightness and definition and more identifiable information while keeping the original color restoration, is beneficial to identifying the color, the shape and other details of an object, and can particularly identify the information such as characters recorded by the image, such as a license plate and the like, in an area with better light reflection property.
the above description is only for facilitating the understanding of the technical solutions of the present invention by those skilled in the art, and is not intended to limit the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (12)
1. A method of capturing an image, comprising:
carrying out light splitting treatment on the received composite light to obtain visible light and infrared light;
Receiving the visible light on a first image sensor, and acquiring a first image according to a first shutter speed;
Receiving the infrared light on a second image sensor, and acquiring a second image according to a second shutter speed, wherein the first shutter speed is greater than the second shutter speed;
and carrying out image fusion on the first image and the second image which are acquired simultaneously to obtain a target image.
2. The method of capturing images of claim 1, further comprising:
And carrying out infrared light supplement on the shooting scene.
3. The method of capturing images of claim 1, further comprising:
And synchronously performing infrared supplementary lighting on the shooting scene during the exposure of the second image sensor.
4. the method of capturing images of claim 1, further comprising:
And controlling the first image sensor and the second image sensor to synchronously expose.
5. the method of capturing images of claim 1, further comprising:
Before the first image is acquired according to the first shutter speed, adjusting the shutter speed corresponding to the first image sensor until first target information identified in a picture formed by the first image sensor sensing visible light meets a first preset condition, and then setting the corresponding shutter speed as the first shutter speed; and/or the presence of a gas in the gas,
Before the second image is acquired according to the second shutter speed, the shutter speed corresponding to the second image sensor is adjusted until second target information identified in a picture formed by the second image sensor sensing infrared light meets a second preset condition, and then the corresponding shutter speed is set as the second shutter speed.
6. The method of capturing photographic images of any of claims 1-5, wherein prior to image fusing the first and second images acquired simultaneously, the method further comprises:
Processing the first image to improve the color reduction degree, and improving the color reduction degree of the first image; and/or the presence of a gas in the gas,
And performing definition improving processing on the second image to improve the definition of the second image.
7. a camera comprising a beam splitter, a first image sensor, a second image sensor, and an image processor, wherein,
The spectroscope is used for separating the received composite light into visible light and infrared light, transmitting the visible light to the first image sensor and transmitting the infrared light to the second image sensor;
The first image sensor is used for receiving the visible light, acquiring a first image according to a first shutter speed and sending the first image to the image processor;
The second image sensor is used for receiving the infrared light, acquiring a second image according to a second shutter speed and sending the second image to the image processor, wherein the first shutter speed is greater than the second shutter speed;
The image processor is configured to perform image fusion on the first image and the second image that are acquired simultaneously to obtain a target image.
8. The camera of claim 7, further comprising a fill-in light for infrared fill-in of the captured scene.
9. The camera according to claim 7, further comprising a fill-in light and a main controller, wherein the main controller is configured to control the fill-in light to synchronously fill in infrared light for the shooting scene during the exposure of the second image sensor.
10. The camera of claim 7, further comprising a master controller for controlling the first image sensor and the second image sensor to be exposed synchronously.
11. The camera of claim 7, further comprising a master controller to:
before the first image sensor acquires a first image according to a first shutter speed, adjusting the shutter speed corresponding to the first image sensor until first target information identified by the image processor in a picture formed by the first image sensor sensing visible light meets a first preset condition, and setting the corresponding shutter speed as the first shutter speed; and/or the presence of a gas in the gas,
Before the second image sensor acquires a second image according to a second shutter speed, adjusting the shutter speed corresponding to the second image sensor until second target information identified by the image processor in a picture formed by the second image sensor sensing infrared light meets a second preset condition, and setting the corresponding shutter speed as the second shutter speed.
12. The camera according to any one of claims 7-11, wherein prior to image fusing the first and second images acquired simultaneously, the image processor is further configured to:
processing the first image to improve the color reduction degree, and improving the color reduction degree of the first image; and/or the presence of a gas in the gas,
and performing definition improving processing on the second image to improve the definition of the second image.
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