CN110445990B - Light filling device and shooting system - Google Patents
Light filling device and shooting system Download PDFInfo
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- CN110445990B CN110445990B CN201910746133.6A CN201910746133A CN110445990B CN 110445990 B CN110445990 B CN 110445990B CN 201910746133 A CN201910746133 A CN 201910746133A CN 110445990 B CN110445990 B CN 110445990B
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B15/00—Special procedures for taking photographs; Apparatus therefor
- G03B15/02—Illuminating scene
- G03B15/03—Combinations of cameras with lighting apparatus; Flash units
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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
- H04N23/10—Cameras or camera modules comprising electronic image sensors; Control thereof for generating image signals from different wavelengths
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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
- H04N23/56—Cameras or camera modules comprising electronic image sensors; Control thereof provided with 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
- H04N23/60—Control of cameras or camera modules
- H04N23/667—Camera operation mode switching, e.g. between still and video, sport and normal or high- and low-resolution modes
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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
- H04N23/71—Circuitry for evaluating the brightness variation
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- H—ELECTRICITY
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- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/70—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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Abstract
The invention provides a light supplementing device and a shooting system, wherein the light supplementing device comprises a first light emitting structure and is used for emitting light of a light supplementing waveband under the condition that the first light emitting structure is started, wherein the light supplementing waveband belongs to a first range, the visual acuity of human eyes corresponding to wavelengths in the first range is smaller than or equal to a first threshold value, and the first threshold value is smaller than 1; the first switch module is used for controlling the first light-emitting structure to be turned on under the condition that the current ambient brightness is lower than a preset first brightness threshold value. According to the invention, the first light-emitting structure is controlled to be started through the ambient brightness, the visual acuity of the human eyes corresponding to the light in the supplementary lighting waveband is less than or equal to the first threshold, and the first threshold is less than 1, namely, the sensitivity of the light in the supplementary lighting waveband relative to the human eyes is low, so that the problem of how to supplement light in a low-brightness environment can be solved, and the technical effects of effectively reducing discomfort of the supplementary lighting system to a human body and light pollution to the environment are achieved.
Description
Technical Field
The invention relates to the field of optics, in particular to a light supplementing device and a shooting system.
Background
In the intelligent recognition field, realize image recognition night and need enough strong light filling lamp light intensity could obtain the image that can carry out the discernment, can lead to the human comfort level of the nearer people of distance light filling lamp to reduce by a wide margin like this to still can cause serious light pollution.
At present, the method of night recognition mainly comprises short-distance white light supplement and recognition or long-distance infrared supplement (black and white). In the related art, the low glare technology mainly performs light supplement by reducing the final light-emitting intensity of the light supplement, for example, a method of polishing and homogenizing emergent surface light, increasing the light-emitting area or reducing the lamp power is adopted; but the disadvantages brought by synchronization are that the central light intensity is reduced and the irradiation distance is reduced; or the fill-in light intensity is reduced, and the photographic equipment uses a lens double sensor or a large aperture to improve the light sensitivity of the imaging module, so that the requirement on the fill-in light intensity can be reduced, namely the light intensity of a fill-in light lamp is reduced, but the method has the defects of high requirement on an imaging system and high cost of the imaging module; in addition, a scheme of using infrared light supplement at night is adopted, the scheme can reduce light pollution, but the problem exists that color information of an image is lost, namely a color image cannot be formed on the camera equipment, only black and white images can be formed, and the black and white images cannot be subjected to color restoration in intelligent identification application.
Disclosure of Invention
The embodiment of the invention provides a light supplementing device and a shooting system, which at least solve the problem of how to supplement light in a low-brightness environment in the related art.
According to an embodiment of the present invention, a light supplement device is provided, which can be used for providing light supplement for a shooting device, and includes a first light emitting structure, configured to emit light in a light supplement band when the first light emitting structure is turned on, where the light supplement band belongs to a first range, where a visual acuity of a human eye corresponding to a wavelength in the first range is less than or equal to a first threshold, and the first threshold is less than 1; the first switch module is used for controlling the first light-emitting structure to be turned on under the condition that the current ambient brightness is lower than a preset first brightness threshold value.
Optionally, the first light emitting structure comprises:
the first light source structure is used for emitting light of the supplementary light waveband; or,
the second light source structure emits original light, and the light filter filters the original light to obtain light of the supplementary light waveband.
Optionally, when the first light-emitting structure includes the second light source structure and the optical filter, the optical filter filters the original light at a light-transmitting waveband to obtain light at the fill-in waveband, where a light transmittance of the optical filter at the light-transmitting waveband is greater than or equal to 85%.
Optionally, the first switch module comprises:
the photosensitive element is used for collecting current environment brightness information and sending the collected environment brightness information to the processor;
and the processor is used for comparing the received environment brightness information with the preset first brightness threshold value so as to determine whether the current environment brightness is lower than the preset first brightness threshold value.
Optionally, the first switch module comprises:
the switch circuit is used for controlling the first light-emitting structure to be started under the condition that the current value in the switch circuit is higher than a preset first current value threshold;
and the photosensitive element is used for adjusting the current value in the switching circuit according to the current ambient brightness, wherein the current value in the switching circuit is increased through the photosensitive element under the condition that the current ambient brightness is reduced.
Optionally, the light supplement device further includes a first light supplement brightness adjustment module, configured to adjust intensity of light in the light supplement band according to current ambient brightness when the first light emitting structure is turned on, so that the ambient brightness after light supplement reaches a preset brightness index.
Optionally, in the light in the fill-in wavelength band, when the visual acuity of a first human eye corresponding to a first wavelength band is higher than the visual acuity of a second human eye corresponding to a second wavelength band, the light intensity of the light in the first wavelength band is smaller than the light intensity of the light in the second wavelength band.
Optionally, when the light supplement device is configured to supplement light for a shooting device, the relative spectral responsivity of the shooting device corresponding to the light supplement waveband is greater than or equal to a second threshold, and the second threshold is greater than 0.
Optionally, when the light supplement device is configured to supplement light for a camera, in light in the light supplement band, when a first relative spectral responsivity of the camera corresponding to a first band is higher than a second relative spectral responsivity of the camera corresponding to a second band, light intensity of the light in the first band is higher than light intensity of the light in the second band.
Optionally, the first light emitting structure emits light of the fill-in wavelength band on at least two wavelength bands of a red wavelength band, a green wavelength band, and a blue wavelength band.
Optionally, the first light emitting structure emits light of the supplementary light waveband at least two wavebands of a waveband of 560-780 nm, a waveband of 500-540 nm and a waveband of 400-500 nm respectively.
Optionally, when the ambient brightness before the light supplement exceeds a preset second brightness threshold, the first range is: 400-541 nmU 569-780 nm;
when the ambient brightness before light supplement is lower than the second brightness threshold, the first range is 400-496 nmU 519-1000 nm.
According to another embodiment of the present invention, a shooting system is provided, which includes any one of the light supplement devices described above, and further includes a shooting device for shooting under the condition that the light supplement device supplements light.
Optionally, the shooting device further includes an adjusting module, where the adjusting module is configured to adjust a relative spectral responsivity of a photosensitive chip included in the shooting device, so that the relative spectral responsivity of the shooting device corresponding to the fill-in light band is greater than or equal to a second threshold, where the second threshold is greater than 0.
According to the embodiment of the invention, the first light-emitting structure is controlled to be started through the ambient brightness to emit light of the supplementary lighting waveband, the visual acuity of human eyes corresponding to the supplementary lighting waveband is smaller than or equal to the first threshold, and the first threshold is smaller than 1, namely the sensitivity of the light of the supplementary lighting waveband relative to the human eyes is lower, so that the problem of how to supplement light in a low-brightness environment can be solved, and the technical effects of effectively reducing discomfort of the supplementary lighting system to a human body and light pollution to the environment are achieved.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the invention without limiting the invention. In the drawings:
fig. 1 is a block diagram of a light supplement device according to an embodiment of the present invention;
fig. 2 is a block diagram of a configuration of a photographing system according to an embodiment of the present invention;
FIG. 3 is a flow chart of a photographing method according to an alternative embodiment of the present invention;
fig. 4 is a flowchart of a photographing method according to another alternative embodiment of the present invention.
Detailed Description
The invention will be described in detail hereinafter with reference to the accompanying drawings in conjunction with embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
Example 1
The embodiment provides a light supplementing device which can be used for supplementing light for a shooting device or a shooting scene. Fig. 1 is a block diagram of a light supplement device according to an embodiment of the present invention, and as shown in fig. 1, a light supplement device 11 includes:
the first light-emitting structure 12 is configured to emit light of a light supplementary waveband when the first light-emitting structure is turned on, where the light supplementary waveband belongs to a first range, where a visual acuity of human eyes corresponding to wavelengths in the first range is less than or equal to a first threshold, and the first threshold is less than 1; the first switch module 13 is configured to control the first light emitting structure to be turned on when the current ambient brightness is lower than a preset first brightness threshold.
According to the embodiment of the invention, the first light-emitting structure is controlled to be started through the ambient brightness to emit light of the supplementary lighting waveband, the visual acuity of human eyes corresponding to the supplementary lighting waveband is smaller than or equal to the first threshold, and the first threshold is smaller than 1, namely the sensitivity of the light of the supplementary lighting waveband relative to the human eyes is lower, so that the problem of how to supplement light in a low-brightness environment can be solved, and the technical effects of effectively reducing discomfort of a supplementary lighting system to a human body and light pollution to the environment are achieved.
It should be noted that the spectrum visible to the human eye is a visible light spectrum, and the sensitivity of the optic nerve of the human eye to various wavelengths of light is different. The relative visual acuity of human vision can be used to evaluate the sensitivity of human eyes to light of different wavelengths, wherein a higher relative visual acuity of human eyes indicates that the human eyes are more sensitive to light of the wavelength, and a lower relative visual acuity of human eyes indicates that the human eyes are less sensitive to light of the wavelength. The relative visual acuity of human vision may take on values from 0 to 1, with a value of 1 indicating that the human eye is most sensitive to light of that wavelength. Because the visual acuity of human eyes corresponding to the waveband of the supplementary lighting is smaller than or equal to the first threshold, the first threshold is smaller than 1, for example, any value smaller than 1, such as 0.9, 0.8, 0.7 … … 0.2.2, 0.1 and the like, is avoided, and the stimulation of the supplementary lighting to the human eyes can be effectively reduced.
In the embodiment, the relative visual acuity of the human eyes is used as a reference index of the supplementary lighting, which means that the supplementary lighting in the embodiment is mainly visible light in the supplementary lighting, and the supplementary lighting in the embodiment can be visible light, and the supplementary lighting using the visible light is helpful for color restoration of the image.
In addition, the term "wavelength band" in the present embodiment may be understood in a broad sense, and may represent a combination of several continuous spectral ranges, a combination of several wavelength values, or a combination of several continuous spectral ranges and several wavelength values; for example, the supplementary lighting of this embodiment may be composed of three lights with wavelengths of 450nm, 520nm, and 630nm, that is, may be composed of a plurality of monochromatic lights, or the supplementary lighting may be composed of lights with wavelengths of 450 to 500nm, 520nm, and 630nm, or the supplementary lighting may be composed of a mixture of lights with wavelengths of 520 to 530nm and 630 to 650nm, which will not be described in detail below.
In one embodiment, the first light emitting structure includes: the first light source structure is used for emitting light in a supplementary light waveband; or the second light source structure emits original light, and the light filter filters the original light to obtain light in a supplementary light band.
The first and second light source structures may be various artificial light sources such as an LED light emitting chip and a flash lamp.
In an embodiment, in a case that the first light emitting structure includes the second light source structure and the optical filter, the optical filter filters the original light in a light transmitting band to obtain light in a fill-in band, wherein a light transmittance of the optical filter in the light transmitting band is greater than or equal to 85%.
For example, the transmittance may be 85%, 90%, 95%, or 100% for a light transmission band, and may be opaque for other bands.
In one embodiment, the first switch module includes:
the photosensitive element is used for acquiring current environment brightness information and sending the acquired environment brightness information to the processor;
and the processor is used for comparing the received ambient brightness information with a preset first brightness threshold value so as to determine whether the current ambient brightness is lower than the preset first brightness threshold value.
In one embodiment, the first switch module includes: the switch circuit is used for controlling the first light-emitting structure to be started under the condition that the current value in the switch circuit is higher than a preset first current value threshold;
and the photosensitive element is used for adjusting the current value in the switching circuit according to the current ambient brightness, wherein the current value in the switching circuit is increased through the photosensitive element under the condition that the current ambient brightness is reduced.
It should be noted that the first switch module may turn on or turn off the supplementary lighting according to the current ambient brightness. It should be noted that the first switch module may be a control circuit including a photosensitive element, and when the photosensitive element receives the ambient light, the control circuit turns on the first light emitting structure or turns off the first light emitting structure according to the intensity of the ambient light. The program module may be a program module controlled by a computer program, and may include, for example, a memory and a processor, where the memory stores a program that, when running, performs the following steps: comparing the brightness information of the preview image of the shooting device with a preset brightness threshold, judging to start the first light-emitting structure when the brightness of the preview image is lower than the preset threshold, and judging not to start the first light-emitting structure or to close the first light-emitting structure when the brightness of the preview image is higher than the preset threshold. The brightness of the preview image is high enough to show that the ambient brightness is enough to shoot, and light supplement is not needed.
In an embodiment, the light supplement device further includes a first light supplement luminance adjusting module, configured to adjust intensity of light in a light supplement band according to current ambient luminance when the first light emitting structure is turned on, so that the ambient luminance after light supplement reaches a preset luminance index.
It should be noted that the first fill-in light brightness adjustment module may be a control circuit including a photosensitive element, and when the photosensitive element receives ambient light, corresponding physical changes are made according to intensity of the ambient light, so that the control circuit adjusts intensity of light in a fill-in light band, for example, intensity of fill-in light may be changed by adjusting magnitude of current. The program module may be a program module controlled by a computer program, and may include, for example, a memory and a processor, where the memory stores a program that, when running, performs the following steps: and comparing the brightness of the preview image of the shooting device with a preset brightness threshold, judging to increase the light supplement intensity when the brightness of the preview image is lower than the preset threshold, and judging to reduce the light supplement intensity when the brightness of the preview image is higher than the preset threshold.
In one embodiment, in the fill-in wavelength band of light, when the visual acuity of the first human eye corresponding to the first wavelength band is higher than the visual acuity of the second human eye corresponding to the second wavelength band, the intensity of the light in the first wavelength band is lower than the intensity of the light in the second wavelength band.
In one embodiment, when the light supplement device is used for supplementing light to the photographing device, the relative spectral responsivity of the photographing device corresponding to the light supplement waveband is greater than or equal to a second threshold, and the second threshold is greater than 0.
In one embodiment, in a case where the light supplement device is used to supplement light to the photographing devices, in the light supplement band, in a case where a first relative spectral responsivity of the photographing device corresponding to the first band is higher than a second relative spectral responsivity of the photographing device corresponding to the second band, the light intensity of the light of the first band is greater than the light intensity of the light of the second band.
The relative spectral responsivity (relative spectral responsivity) of the imaging device can be used to indicate the sensitivities of the imaging device to light of different wavelengths, and the higher the relative spectral responsivity, the higher the photoelectric conversion efficiency of the imaging device with respect to light of the wavelength, and therefore, the higher the relative spectral responsivity of the imaging device with respect to the fill-in light band. The relative spectral responsivity can take values from 0 to 1. The relative spectral responsivity of the shooting device corresponding to the light supplement waveband needs to be higher than a certain threshold value, namely higher than a second threshold value, and the light supplement efficiency is improved. The second threshold value may be any value between 0.1 and 1.
It should be noted that, the higher the relative spectral responsivity corresponding to the light in the fill-in light band is, the higher the conversion efficiency of the photographing device to the fill-in light is, and the lower the visual acuity of the human eye is, the less sensitive the human eye is. Therefore, the light intensity of the waveband with higher relative spectral responsivity and lower relative visual acuity of the human eye in the supplementary lighting can be improved, or the waveband with higher relative spectral responsivity and lower relative visual acuity of the human eye can be used as the supplementary lighting as much as possible, so that the stimulation to the human eye is further reduced, and the supplementary lighting efficiency is improved.
In one embodiment, the first light emitting structure emits supplementary light in at least two wavelength bands of a red wavelength band, a green wavelength band, and a blue wavelength band. The light supplement is carried out by using the light of the two primary colors or the light of the three primary colors, which is beneficial to the color restoration of the shot image.
In one embodiment, the first light emitting structure emits light in a supplementary light wavelength band at least two of 560 to 780nm wavelength bands, 500 to 540nm wavelength bands and 400 to 500nm wavelength bands respectively
In one embodiment, when the ambient brightness before the light supplement exceeds a preset second brightness threshold, the first range is: 400 to 541nmU569 to 780 nm; when the ambient brightness before the supplementary lighting is lower than the second brightness threshold, the first range is 400-496 nmU 519-1000 nm.
The human eye has a photopic vision and a scotopic vision, and the visual acuity of the two kinds of vision to visible light is different. The division of photopic vision and scotopic vision is mainly based on the environment brightness, when the environment brightness is higher, the vision of human eyes belongs to photopic vision, and when the environment brightness is lower, the vision of human eyes belongs to scotopic vision. In the embodiment, the light in the supplementary lighting waveband is also distinguished by the photopic vision and the scotopic vision of human eyes, so that the discomfort of a human body is better avoided.
The light supplement band is within 400-541 nmU 569-780nm, and the band capable of indicating light supplement is any interval within the range of the band, for example, an interval between any two values of 400nm, 401nm, 402nm, 403nm … … 540nm, 541nm, 569nm, 570nm, 571nm, 572nm … … 778nm, 779nm and 780 nm; any wavelength point value in the range can be included, and any interval and any wavelength value combination in the union set can be included, which is not listed; similarly, the supplementary lighting waveband is within 400-496 nmU 519-1000 nm, and the supplementary lighting waveband can be any interval or any wavelength value or any combination of interval and any wavelength value in the waveband range.
Fig. 2 is a block diagram of a shooting system according to an embodiment of the present invention, and as shown in fig. 2, the shooting system 21 includes any one of the light supplement devices 22; the device further comprises a shooting device 23 for shooting under the condition that the supplementary lighting device provides supplementary lighting.
According to the embodiment of the invention, the first light-emitting structure is controlled to be started through the ambient brightness to emit light of the supplementary lighting waveband, the visual acuity of human eyes corresponding to the supplementary lighting waveband is smaller than or equal to the first threshold, and the first threshold is smaller than 1, namely the sensitivity of the light of the supplementary lighting waveband relative to the human eyes is lower, so that the problem of how to supplement light in a low-brightness environment can be solved, and the technical effects of effectively reducing discomfort of a supplementary lighting system to a human body and light pollution to the environment are achieved.
It should be noted that the shooting system in this embodiment may be understood as a shooting device integrated with a light supplement device (e.g., a light supplement lamp), or may be understood as a shooting combination product of a light supplement device and a shooting device that can be sold in a set.
In one embodiment, the photographing apparatus further includes a white balance adjustment module for adjusting a white balance according to the light of the fill-in light band.
In one embodiment, the photographing device further includes an adjusting module, where the adjusting module is configured to adjust a relative spectral responsivity of a photosensitive chip included in the photographing device, so that the relative spectral responsivity of the photographing device corresponding to the fill-in light band is greater than or equal to a second threshold, where the second threshold is greater than 0.
The adjusting module can adjust the relative spectral responsivity of the photosensitive chip included in the shooting device, for example, the relative spectral responsivity of the photosensitive chip is adjusted through the spectral design and processing of the photosensitive chip surface array microlens, so that the relative spectral responsivity of the shooting device corresponding to the waveband of the supplementary light emitted by the light supplementing device is greater than or equal to a second threshold, wherein the second threshold is greater than 0.
Under certain conditions, the wave band with low stimulation to human eyes is not the wave band with high spectral responsivity of the shooting equipment, so that the relative spectral responsivity of the shooting equipment on the light supplementing wave band can be adjusted, the photoelectric conversion efficiency of light supplementing is improved, and images are collected and restored better under the light supplementing condition. As above, the relative spectral responsivity (relative spectral responsivity) of the imaging device can be used to indicate the sensitivities of the imaging device to lights of different wavelengths, and the higher the relative spectral responsivity of light of a wavelength means the higher the photoelectric conversion efficiency of the imaging device with respect to the light of the wavelength, so the higher the relative spectral responsivity of the imaging device corresponding to the wavelength band of the fill light is. The relative spectral responsivity can take values from 0 to 1. The relative spectral responsivity of the shooting device corresponding to the supplementary lighting needs to be higher than a certain threshold, namely higher than a second threshold, and the supplementary lighting efficiency is improved. The second threshold value may be any value between 0.1 and 1.
It should be noted that, both the module for controlling on or off of the supplementary lighting and the module for adjusting the intensity of the light in the supplementary lighting band may be disposed on a separate supplementary lighting device, or may be disposed on the shooting device.
The following further explains the embodiments of the present invention with reference to specific scenarios:
the embodiment of the invention can ensure the irradiation distance of the supplementary lighting on the premise that the cost of the whole system is not basically increased, namely a common imaging system, simultaneously realize color restoration, and effectively reduce the discomfort degree of the supplementary lighting system to a human body and the light pollution to the environment.
In one embodiment, light supplement can be performed according to the sensitivity of human eyes and photosensitive chips in the shooting device to different spectra, for example, at night, a spectrum in a visible light spectrum range with low sensitivity of human eyes and high sensitivity of the photosensitive chips is selected to perform design of a light supplement and light supplement system, and meanwhile, a white balance system corresponding to the turned-on light supplement system is debugged through an ISP system, so that color restoration of an optical imaging scheme is ensured. And selecting the white balance system under the condition that the light supplementing system is started or not started through a photosensitive sensor or an electrifying signal. Under the full-color scheme at daytime night, guarantee camera image brightness, effectively reduce light pollution, reduce the amazing degree of light filling lamp to people's eye, improve the utilization ratio of sensitization chip to the light filling lamp simultaneously.
In one embodiment, the brightness of the fill-in light suitable for the current scene can be found through software control, the intensity of the white light lamp can be intelligently controlled, and light pollution caused by the white light lamp can be reduced to the maximum extent. For example, when the ambient light is still turned on, the fill-in light is only turned on to a sufficient light intensity, and the light intensity of the fill-in light can be gradually increased as the ambient light brightness is reduced.
In addition, the image white balance program required when the fill light is turned on for fill light is different from the white balance when the fill light is not turned on (the ambient brightness is enough such as in the daytime), so that the software can select the corresponding white balance according to whether the fill light is turned on or not.
In one embodiment, the fill-in light can be implemented by hardware, such as a light emitting chip combination, or a light emitting source and a filter. It should be particularly noted that, in this embodiment, the light spectrum sensitive to the camera image sensor (cmos/CCD) is mainly selected, and the spectrum sensitive to human eyes (glaring) is filtered out, and this portion is selected to supplement light to the camera, so that the effect of low light pollution but high picture brightness is achieved. The spectrum selection can be carried out under two conditions, the selection can be carried out according to the camera sensor (which is overlapped with the spectrum stimulated by human eyes at present) in industrial mass production, the light sensing characteristic of the camera sensor can be adjusted, the difference between the light sensing characteristic and the spectrum sensitive to the human eyes is enlarged as much as possible, and therefore the spectrum insensitive to the human eyes and the spectrum sensitive to the light sensing chip can be selected.
Can realize the real reduction of colour simultaneously of light filling night through flowchart 3 or flowchart 4, realize simultaneously that light source light intensity is intelligent adjustable. For example, controlling the intensity of the fill-in light may be implemented by a controller on the photographing apparatus, and in particular, may be implemented by a sensor, a related circuit, and a corresponding computer program stored in a processor and a memory, where the sensor may sense the brightness of the environment, and the circuit may adjust the brightness of the fill-in light through an electrical signal. For example, the control flow shown in fig. 3:
the intensity of the ambient light (ambient brightness) can be sensed through the sensor, so that the intensity of the supplementary light can be adjusted. For example, in fig. 3, the ambient light intensity is received through a sensor (e.g., a photosensor), and then whether the ambient light brightness at this time is enough is determined, when the ambient light brightness is enough, the light supplement lamp does not need to be started when the shooting requirement can be met, when the ambient light brightness is not enough, the light supplement lamp module is started and the light supplement lamp mode is replaced with a white balance, then the light supplement lamp current is gradually increased (i.e., the brightness of the light supplement lamp is improved), then whether the current ambient light brightness is enough is determined through the sensor (photosensitive), if not enough, the light supplement lamp current is continuously increased, the brightness of the light supplement lamp is improved, and when the ambient light brightness is enough, the light supplement lamp current is not adjusted any more.
In addition, light supplement can be performed by judging whether the picture brightness of the shooting device meets the preset condition for turning on the light supplement lamp, for example, in the process shown in fig. 4, when the shooting picture brightness is enough, the light supplement lamp does not need to be turned on, and when the shooting picture brightness is not enough, an identifiable image with true and restored colors cannot be obtained, the light supplement lamp needs to be turned on. When the picture brightness meets the preset condition, the light supplementing module is started and the light supplementing lamp mode is replaced by the light supplementing lamp mode for white balance, then the light supplementing lamp current is gradually increased (namely, the brightness of the light supplementing lamp is improved), then whether the current picture brightness is enough is judged through software, if not, the light supplementing lamp current is continuously increased, the brightness of the light supplementing lamp is improved, and when the picture brightness is enough, the light supplementing lamp current is not adjusted.
In one embodiment, the spectrum in the partial visible wavelength range that is insensitive to the human eye but sensitive to sensor sensitivity can be tuned by a combination of light emitting chips, the number of light emitting chips and the intensity adjustment of each chip. And aiming at the selected visible light spectrum corresponding to the light supplement system, adjusting the white balance to restore the color.
In one embodiment, after obtaining the required fill-in light source for visible light with a specific spectrum, the imaging optical element, i.e. the filter of the camera system or the lens, is designed for the spectrum, so that the filter used at night has a high transmittance corresponding to the spectrum of the fill-in light source, for example, 85% or more.
In one embodiment, the light emitting chips are combined separately by RGB, and are adjusted by a multi-light emitting chip combination mode, so that the final spectrum with low human eye sensitivity and high chip sensitivity is obtained. The blue light, the green light and the red light can be combined according to the photosensitive characteristics and can be 1:2: 6. Wherein, the light intensity ratio of red light > green light > blue light is finally obtained. A light supplement scheme with the sensor photosensitive characteristic being not customized adopts a light supplement peak of 450nm (B), 520nm (G) and 630nm (R) as a light emitting chip, wherein the light supplement peak can be released to 450nm +/-50, 500-541 nm and 569-780 nm.
Meanwhile, the corresponding lens night light filter needs to be made to be high-transparent corresponding to a visible light spectrum waveband, wherein the transmittance can be more than or equal to 85%, the high-transparency of the spectrum corresponding to the light supplementing lamp source is ensured, and the infrared part is filtered. The lens transmittance of the corresponding matched lens can be selectively subjected to high-transmittance filtering control of corresponding wave bands, and the optical filter and the lens can also be selected from conventional general products without special transmittance treatment.
Meanwhile, optionally, the sensing spectrum of the sensor (sensor chip) may be adjusted correspondingly, if the optical filter of the sensor chip is adjusted, the corresponding spectral range with low visual sensitivity is obtained, for example, the transmittance peak value of the sensor chip is selected in the 400-541nm and 569-780nm intervals, and the corresponding optical filter of the light supplement system is also adjusted to the above-mentioned waveband, that is, the spectrum is selected as the transmittance peak spectrum of the light source optical filter in the ± 10nm interval of the sensor response curve peak after the sensing spectrum is adjusted.
The embodiment can reduce the stimulation degree to human eyes on the premise of ensuring the radiation intensity and the shooting distance of the camera; and the spectrum of the high-sensitivity visible light range of the low-sensitivity human eye photosensitive chip can be screened according to the human eye vision, so that the full color is realized.
In the embodiment, the light source of the spectrum which is insensitive to human eyes but sensitive to a camera sensor is debugged by combining different spectrum light-emitting chips and controlling the number of the chips and the debugging of the light-emitting intensity of each chip, and the light source is required to comprise a three-color light source, wherein R is more than G and more than B.
In the embodiment, corresponding white balance is performed on the screened spectrum; a method for mitigating ambient light pollution through light source spectral selection.
The embodiment controls the intensity of the low-pollution white light lamp current to realize the intensity change of the light intensity; for example, the fill-in light intensity may be adjusted according to the ambient brightness or the screen brightness of the image.
The embodiment can filter the light source by using the optical filter without adjusting the photosensitive characteristic of the photosensitive chip so as to emit supplementary light in the optimal spectral range; or directly making the lamp source emit light supplement in the optimal spectral range. When the filter is used for filtering out the needed supplementary light spectrum, the low transmittance control can be carried out on the high sensitivity 541 nm-569 nm of human eyes, or the wave band is selected to be controlled in the range. For example, the low transmittance in this wavelength band can be set, for example, within 50%; meanwhile, the wave bands of 400-541nm and 569-780nm outside the interval can be set to be high-transmittance, or the spectrum of any interval selected in the range is set to be more than or equal to 85% of transmittance. The corresponding fill-in light peak or transmittance peak can be selected in the above range, and 2 or more peaks are required, which can be matched as follows: 450nm, 520nm and 630nm, the peak can be selected in two ranges of 400-541nm and 569-780 nm.
The sensor (photosensitive chip) sensing spectrum in this embodiment can be selectively adjusted or shifted, for example, the optimal range of the light sensing can be selected to be 400-520 nm and 590-700 nm, the eye-insensitive region is selected, and the corresponding light emitting chip is adjusted to the same band as the photosensitive chip, avoiding 541-569nm, which is the most sensitive to the eye.
The scheme of the embodiment is combined with the method of adjustable light intensity, so that the reduction of the environmental light pollution is optimized from two dimensions.
It will be apparent to those skilled in the art that the modules or steps of the present invention described above may be implemented by a general purpose computing device, they may be centralized on a single computing device or distributed across a network of multiple computing devices, and alternatively, they may be implemented by program code executable by a computing device, such that they may be stored in a storage device and executed by a computing device, and in some cases, the steps shown or described may be performed in an order different than that described herein, or they may be separately fabricated into individual integrated circuit modules, or multiple ones of them may be fabricated into a single integrated circuit module. Thus, the present invention is not limited to any specific combination of hardware and software.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the principle of the present invention should be included in the protection scope of the present invention.
Claims (11)
1. A light supplement device, comprising:
the device comprises a first light-emitting structure and a second light-emitting structure, wherein the first light-emitting structure is used for emitting light of a light supplementing waveband when the first light-emitting structure is turned on, the light supplementing waveband belongs to a first range, the visual acuity of human eyes corresponding to wavelengths in the first range is smaller than or equal to a first threshold value, and the first threshold value is smaller than 1;
the first switch module is used for controlling the first light-emitting structure to be started under the condition that the current ambient brightness is lower than a preset first brightness threshold value;
the first supplementary lighting brightness adjusting module is used for adjusting the intensity of light of the supplementary lighting waveband according to the current ambient brightness under the condition that the first light-emitting structure is started, so that the ambient brightness after supplementary lighting reaches a preset brightness index;
in the light in the supplementary light band, under the condition that the visual acuity of a first human eye corresponding to a first band is higher than the visual acuity of a second human eye corresponding to a second band, the light intensity of the light in the first band is smaller than that of the light in the second band;
when the light supplement device is used for supplementing light for the shooting device, in the light of the light supplement waveband, under the condition that the first relative spectral responsivity of the shooting device corresponding to a first waveband is higher than the second relative spectral responsivity of the shooting device corresponding to a second waveband, the light intensity of the light of the first waveband is higher than that of the light of the second waveband.
2. A light supplement device according to claim 1, wherein the first light emitting structure comprises:
the first light source structure is used for emitting light of the supplementary light waveband; or,
the second light source structure emits original light, and the light filter filters the original light to obtain light of the supplementary light waveband.
3. A light supplement device according to claim 2, wherein when the first light emitting structure includes the second light source structure and the optical filter, the optical filter filters the original light in a light transmitting band to obtain light in the light supplement band, and a light transmittance of the optical filter in the light transmitting band is greater than or equal to 85%.
4. The light supplement device of claim 1, wherein the first switch module comprises:
the photosensitive element is used for acquiring current environment brightness information and sending the acquired environment brightness information to the processor;
and the processor is used for comparing the received environment brightness information with the preset first brightness threshold value so as to determine whether the current environment brightness is lower than the preset first brightness threshold value.
5. A light supplement apparatus according to claim 1, wherein the first switch module comprises:
the switch circuit is used for controlling the first light-emitting structure to be started under the condition that the current value in the switch circuit is higher than a preset first current value threshold;
and the photosensitive element is used for adjusting the current value in the switching circuit according to the current ambient brightness, wherein the current value in the switching circuit is increased through the photosensitive element under the condition that the current ambient brightness is reduced.
6. A light supplement device according to claim 1, wherein when the light supplement device is used for supplementing light to a camera, a relative spectral responsivity of the camera corresponding to the light supplement band is greater than or equal to a second threshold, and the second threshold is greater than 0.
7. A fill-in light device according to claim 1, wherein the first light emitting structure emits light in the fill-in light band in at least two of a red light band, a green light band, and a blue light band.
8. A light supplement device according to claim 1, wherein the first light emitting structure emits light of the light supplement wavelength band at least two of 560-780 nm wavelength band, 500-540 nm wavelength band and 400-500 nm wavelength band.
9. A light supplement device as claimed in claim 1, wherein when the ambient brightness before light supplement exceeds a second preset brightness threshold, the first range is: 400 to 541nmU569 to 780 nm;
when the ambient brightness before light supplement is lower than the second brightness threshold, the first range is 400-496 nmU 519-1000 nm.
10. A photographing system comprising the light supplement apparatus according to any one of claims 1 to 9;
the device also comprises a shooting device used for shooting under the condition of light supplement of the light supplement device.
11. The camera system according to claim 10, wherein the camera further includes an adjusting module, and the adjusting module is configured to adjust a relative spectral responsivity of a light sensing chip included in the camera, so that the relative spectral responsivity of the camera corresponding to the fill-in light band is greater than or equal to a second threshold, where the second threshold is greater than 0.
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