CN103781261A - Infrared lamp control method for infrared network camera - Google Patents
Infrared lamp control method for infrared network camera Download PDFInfo
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- CN103781261A CN103781261A CN201410075224.9A CN201410075224A CN103781261A CN 103781261 A CN103781261 A CN 103781261A CN 201410075224 A CN201410075224 A CN 201410075224A CN 103781261 A CN103781261 A CN 103781261A
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Abstract
The invention discloses an infrared lamp control method for an infrared network camera. The infrared lamp control method comprises the following steps of: S10, acquiring a scenery image in a standard infrared scene, acquiring the red compound values, green compound values and blue compound values of all pixel points in the image, and calculating the optical characteristic values of all the pixel points in the standard infrared scene; S20, calculating the assessed value of a visible light intensity according to the optical characteristic values of the pixel points of the image in the standard infrared scene and the preset visible light sensitivity threshold value of a single pixel point; S30, when the assessed value of the visible light intensity is greater than the visible light sensitivity threshold value, automatically turning off an infrared lamp and switching the camera to a day mode; S40, when the compensation RGB gain in the infrared network camera is greater than a gain sensitivity threshold value, automatically turning on the infrared lamp and switching the camera to a night mode. The infrared lamp control method disclosed by the invention is free from the phenomenon of misjudgement, and beneficial to the accurate mutual switchover of the camera between the night mode and the day mode, thus ensuring the input quality of the image.
Description
Technical field
The present invention relates to infrared network video camera, relate in particular to a kind of infrared lamp control method of infrared network video camera.
Background technology
Infrared lamp open and close control is the necessary functions on infrared network video camera.When ambient light is weak, open infrared lamp, utilize imageing sensor, in the photobehavior of near infrared band, video camera is carried out to light filling.Opening and closing control to infrared lamp can reduce power consumption, increases infrared lamp useful life.
Conventionally the method adopting in prior art is to utilize the brightness of the photoelectric characteristic reception environment of photo resistance, then the change in resistance of photo resistance is converted to the variation of the signal of telecommunication, to obtain ambient brightness, judges whether to open infrared lamp and carries out light filling.Usual way, takies system hardware resources, needs peripheral circuit and device support, realizes hardware cost higher; Can accurately not judge the brightness of actual photographed scene, easily be caused the erroneous judgement of equipment to ambient brightness if photo resistance covers.
Summary of the invention
The present invention proposes a kind of infrared lamp control method of infrared network video camera, what mainly solve is that the brightness of the photoelectric characteristic induced environment of available technology adopting photo resistance judges video camera is carried out to light filling, easily cause erroneous judgement, and realize the problem that cost is high.。
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: a kind of infrared lamp control method of infrared network video camera is provided, comprises the steps:
S10, gather the scene image in standard IR Scene and obtain red color component value, green component values and the blue component value of all pixels in image, and according to the optical feature value of all pixels in red color component value, green component values and blue component value calculating standard IR Scene image, wherein, described optical feature value is the ratio of the red color component value of all pixels and the ratio of green component values and blue component value and green component values in standard IR Scene image;
S20, according to the default visible ray threshold of sensitivity of the optical feature value of image slices vegetarian refreshments in standard IR Scene and single pixel, calculate the assessed value of visual intensity;
S30, in the time that the assessed value of visual intensity is greater than the visible ray threshold of sensitivity, automatically close infrared lamp and video camera is switched to a day inter mode by Night, wherein, the visible ray threshold of sensitivity be video camera from day inter mode switch to the Sensitirity va1ue of the visible ray of module at night;
S40, in the time that the compensation RGB gain in infrared network video camera is greater than gain sensitivity threshold value, automatically open infrared lamp and by video camera by day inter mode switch to Night.
Wherein, in described step S10, also comprise the step of selecting RGB tri-look micro optical filters to filter to all pixels of image.
Wherein, in described step S20, the assessed value of visual intensity is the ratio value b that exceeds the shared whole pixels of pixel of the default visible ray threshold of sensitivity, and concrete computing formula is as follows:
b=n1/n
Wherein, n1 represents to exceed the pixel number of the default visible ray threshold of sensitivity, and n represents whole pixel numbers.
Wherein, described step S20 also comprises the step that records all pixel numbers that exceed the default visible ray threshold of sensitivity, specifically comprises:
Initialization exceeds the pixel number n1 of default visible ray Sensitirity va1ue,
In the time that pixel exceeds the scope of the default visible ray threshold of sensitivity, record exceeds the pixel number of default visible ray Sensitirity va1ue, and concrete judgment formula is as follows;
(R
g-R/G)
2+(B
g-B/G)
2>a，
Wherein, a is the default visible ray threshold of sensitivity of single pixel, Rg is the ratio of the fixing red color component value of infrared lamp and green component values, Bg is the blue component value of infrared lamp and the ratio of green component values, R/G is the red color component value of actual measurement and the ratio of green component values, and B/G is the blue component value of actual measurement and the ratio of green component values.
Wherein, also comprise the step that image is increased to default tolerance to the Sensitirity va1ue of visible ray in described step S30, concrete computing formula is:
b=b
0+d，
Wherein, b represents the Sensitirity va1ue of visible ray, b0 represent video camera from day inter mode switch to the sensitivity thresholding of the visible ray of module at night, d represents default tolerance.
Useful technique effect of the present invention is: the brightness that is different from the photoelectric characteristic induced environment of available technology adopting photo resistance judges carries out light filling to video camera, the erroneous judgement easily causing and affect the problem of image input, the invention provides a kind of infrared lamp control method of infrared network video camera, by the pixel RGB data to collection image, calculate the optical feature value of pixel, can calculate the assessed value of visual intensity according to the optical feature value of image slices vegetarian refreshments in standard IR Scene and visible ray Sensitirity va1ue, realize the control to infrared lamp open and close, concrete, in the time that the assessed value of visual intensity is greater than the visible ray threshold of sensitivity, automatically closes infrared lamp and video camera is switched to a day inter mode by Night, in the time that the compensation RGB gain in infrared network video camera is greater than gain sensitivity threshold value, automatically open infrared lamp and by video camera by day inter mode switch to Night.The present invention adopts software by obtaining the mode of loudness point of image, realize the Night and day inter mode that switch video camera, there will not be the phenomenon of erroneous judgement, be conducive to the mutual switching of the accurate Night of video camera and day inter mode, guarantee the input quality of image.
Accompanying drawing explanation
Fig. 1 is the optical filtering spectrogram of the 645nm cut-off frequency filter that adopts of the present invention;
Fig. 2 is the optical filtering spectrogram of the three look micro optical filters that adopt of the present invention;
Fig. 3 is the flow chart of the infrared lamp control method of infrared network video camera of the present invention;
Fig. 4 is that wavelength is the infrared lamp spectrogram of 850nm;
Fig. 5 is that wavelength is the infrared lamp spectrogram of 940nm.
Embodiment
By describing technology contents of the present invention, structural feature in detail, being realized object and effect, below in conjunction with execution mode and coordinate accompanying drawing to be explained in detail.
Refer to Fig. 3, the present embodiment provides a kind of infrared lamp control method of infrared network video camera, comprises the steps:
S10, gather the scene image in standard IR Scene and obtain red color component value, green component values and the blue component value of all pixels in image, and according to the optical feature value of all pixels in red color component value, green component values and blue component value calculating standard IR Scene image, wherein, described optical feature value is the ratio of the red color component value of all pixels and the ratio of green component values and blue component value and green component values in standard IR Scene image;
S20, according to the default visible ray threshold of sensitivity of the optical feature value of all pixels in standard IR Scene image and single pixel, calculate the assessed value of current visual intensity.Concrete, in described step S20, the assessed value of visual intensity is the ratio value b that exceeds the shared whole pixels of pixel of the default visible ray threshold of sensitivity, concrete computing formula is as follows:
b=n1/n
Wherein, n1 represents to exceed the pixel number of the default visible ray threshold of sensitivity, and n represents whole pixel numbers.
S30, in the time that the assessed value of visual intensity is greater than the visible ray threshold of sensitivity, automatically close infrared lamp and video camera is switched to a day inter mode by Night, wherein, the visible ray threshold of sensitivity be video camera from day inter mode switch to the Sensitirity va1ue of the visible ray of module at night; Video camera from night to day inter mode switch time, can utilize process chip to process.
S40, in the time that the compensation RGB gain in infrared network video camera is greater than gain sensitivity threshold value, automatically open infrared lamp and by video camera by day inter mode switch to Night.In the time of extraneous insufficient light, common thermal camera all can be given the brightness that automatically regulates image, namely for image provides RGB gain.And in the time that the brightness of visible ray is too low, at this moment provide visible ray by infrared lamp.
In a specific embodiment, in described step S10, also comprise the step of selecting RGB tri-look micro optical filters to filter to all pixels of image.Here adopt three look micro optical filters to filter to image, its objective is the brightness of R, G in gating pixel, B tri-looks, so that follow-up brightness to RGB in pixel is analyzed.
In a specific embodiment, described step S20 also comprises the step that records all pixel numbers that exceed the default visible ray threshold of sensitivity, specifically comprises:
Initialization exceeds the pixel number n1 of default visible ray Sensitirity va1ue,
In the time that pixel exceeds the scope of the default visible ray threshold of sensitivity, record exceeds the pixel number of default visible ray Sensitirity va1ue, and concrete judgment formula is as follows;
(R
g-R/G)
2+(B
g-B/G)
2>a，
Wherein, a is the default visible ray threshold of sensitivity of single pixel, Rg is the ratio of the fixing red color component value of infrared lamp and green component values, Bg is the blue component value of infrared lamp and the ratio of green component values, R/G is the red color component value of actual measurement and the ratio of green component values, and B/G is the blue component value of actual measurement and the ratio of green component values.This step specifically judges by falling into the visible ray range of sensitivity, when night, the rgb value of pixel is provided by infrared lamp, now, all pixels are not all in the scope of visible ray, and when dawn, partial pixel point is exposed at outside the scope of visible ray sensitivity, at this moment, can calculate the assessed value of concrete visible ray visual intensity.
In a specific embodiment, in described step S30, also comprise the step that image is increased to default tolerance to the Sensitirity va1ue of visible ray, concrete computing formula is:
b=b
0+d，
Wherein, b represents the Sensitirity va1ue of visible ray, b0 represent video camera from day inter mode switch to the sensitivity thresholding of the visible ray of module at night, d represents default tolerance.Above-mentioned tolerance is to prevent the video camera switching repeatedly of critical conduction mode again.
Concrete principle is as follows: due to the refractive index difference of different light, and the imageing sensor that equipment uses can arrive near infrared band by sensitive volume.If so do not use filter easily to cause image empty burnt.The filter on daytime can filter near infrared light.Filter, due to specification difference, has different cut-off frequencies, and Fig. 1 is the spectrogram of 645nm cut-off frequency filter.The filter that used night is full impregnated sheet, and the transmitance of the light to all frequencies all approaches absolutely.Imageing sensor micro optical filter: for color image sensor, sensor pixel surface has RGB tri-look micro optical filters, filter spectral characteristic is illustrated in fig. 2 shown below: from left to right, the blue brightness of the curve presentation video of first crest, the green brightness of the curve presentation video of second crest, the red brightness of the curve presentation video of the 3rd crest.The light wavelength that common infrared light compensating lamp sends is on the market in the time that 850nm is above, can find out the light filling wave band infrared band in infrared lamp work, consult Fig. 4 and Fig. 5, Fig. 4 is that wavelength is 850 infrared lamp spectrogram, be the infrared lamp spectrogram of 940nm and Fig. 5 is wavelength, the light penetration curve of RGB three-colour filter overlaps, so the infrared light sending for infrared lamp, the no matter power of light, the value of R/G B/G is fixed.And due to visible light wave range, the color difference of object, the ratio of RGB can depart from the definite value while only having infrared lamp, analyzes the size that departs from, get final product appear at see luminous intensity.To sum up, the judgement of the optical signature to infrared lamp just can draw the power of pixel brightness, and this part can realize by the processor of special image processing hardware and control use.
The brightness that the present invention is different from the photoelectric characteristic induced environment of available technology adopting photo resistance judges carries out light filling to video camera, the erroneous judgement easily causing and affect the problem of image input, the invention provides a kind of infrared lamp control method of infrared network video camera, by the pixel RGB data to collection image, calculate the optical feature value of pixel, according to the default visible ray threshold of sensitivity of the optical feature value of image slices vegetarian refreshments in standard IR Scene and single pixel, calculate the assessed value of described image to visual intensity, realize the control to infrared lamp open and close, concrete, in the time that the assessed value of visual intensity is greater than the visible ray threshold of sensitivity, automatically closes infrared lamp and video camera is switched to a day inter mode by Night, in the time that the compensation RGB gain in infrared network video camera is greater than gain sensitivity threshold value, automatically open infrared lamp and by video camera by day inter mode switch to Night.The present invention adopts software by obtaining the mode of loudness point of image, realize the Night and day inter mode that switch video camera, there will not be the phenomenon of erroneous judgement, be conducive to the mutual switching of the accurate Night of video camera and day inter mode, guarantee the input quality of image.
The foregoing is only embodiments of the invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes specification of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (5)
1. an infrared lamp control method for infrared network video camera, is characterized in that, comprises the steps:
S10, gather the scene image in standard IR Scene and obtain red color component value, green component values and the blue component value of all pixels in image, and according to the optical feature value of all pixels in red color component value, green component values and blue component value calculating standard IR Scene image, wherein, described optical feature value is the ratio of the red color component value of all pixels and the ratio of green component values and blue component value and green component values in standard IR Scene image;
S20, according to the default visible ray threshold of sensitivity of the optical feature value of image slices vegetarian refreshments in standard IR Scene and single pixel, calculate the assessed value of visual intensity;
S30, in the time that the assessed value of visual intensity is greater than the visible ray threshold of sensitivity, automatically close infrared lamp and video camera is switched to a day inter mode by Night, wherein, the visible ray threshold of sensitivity be video camera from day inter mode switch to the Sensitirity va1ue of the visible ray of module at night;
S40, in the time that the compensation RGB gain in infrared network video camera is greater than gain sensitivity threshold value, automatically open infrared lamp and by video camera by day inter mode switch to Night.
2. the infrared lamp control method of infrared network video camera according to claim 1, is characterized in that, also comprises the step of selecting RGB tri-look micro optical filters to filter to all pixels of image in described step S10.
3. the infrared lamp control method of infrared network video camera according to claim 1, it is characterized in that, in described step S20, the assessed value of visual intensity is the ratio value b that exceeds the shared whole pixels of pixel of the default visible ray threshold of sensitivity, and concrete computing formula is as follows:
b=n1/n
Wherein, n1 represents to exceed the pixel number of default visible ray sensitivity threshold values, and n represents whole pixel numbers.
4. the infrared lamp control method of infrared network video camera according to claim 3, is characterized in that, described step S20 also comprises the step that records all pixel numbers that exceed the default visible ray threshold of sensitivity, specifically comprises:
Initialization exceeds the pixel number n1 of the default visible ray threshold of sensitivity,
In the time that pixel exceeds the scope of the default visible ray threshold of sensitivity, record exceeds the pixel number of default visible ray Sensitirity va1ue, and concrete judgment formula is as follows;
(R
g-R/G)
2+(B
g-B/G)
2>a，
Wherein, a is the default visible ray threshold of sensitivity of single pixel, Rg is the ratio of the fixing red color component value of infrared lamp and green component values, Bg is the blue component value of infrared lamp and the ratio of green component values, R/G is the red color component value of actual measurement and the ratio of green component values, and B/G is the blue component value of actual measurement and the ratio of green component values.
5. the infrared lamp control method of infrared network video camera according to claim 3, is characterized in that, also comprises the step that image is increased to default tolerance to the Sensitirity va1ue of visible ray in described step S30, and concrete computing formula is:
b=b
0+d，
Wherein, b represents the Sensitirity va1ue of visible ray, b0 represent video camera from day inter mode switch to the sensitivity thresholding of the visible ray of module at night, d represents default tolerance.
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