CN201467300U - Day and night dual-purpose camera, light filter and optical system thereof - Google Patents
Day and night dual-purpose camera, light filter and optical system thereof Download PDFInfo
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- CN201467300U CN201467300U CN2009201315268U CN200920131526U CN201467300U CN 201467300 U CN201467300 U CN 201467300U CN 2009201315268 U CN2009201315268 U CN 2009201315268U CN 200920131526 U CN200920131526 U CN 200920131526U CN 201467300 U CN201467300 U CN 201467300U
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Abstract
The utility model discloses a day and night dual-purpose camera, a light filter and an optical system. the day and night dual-purpose camera comprises an optical system, the optical system comprises a lens, an image sensor and a light filter between the lens and the sensor; the optical system has the color revised rate D which is more than 34.15 and has the infrared inductivity E which is more than 1.45%, wherein the D equals to (Tkj*Tkl*Delta C)/(Thj*Thl*Delta CMAX), and the E equals to (Thj*Thl*Ths); Tkj is the visible light transmittance of the lens, Tkl is the visible light transmittance of the light filter, Thj is the infrared average light transmittance of the lens in range of 800-900 nm, Thl is the infrared average light transmittance of the light filter in range of 800-900 nm, Ths is the induction capability of the image sensor in the range of 800-900 nm, Delta CMAX is the maximum difference of the infrared average induction capability of each pixel of the image sensor in the range of 800-900 nm, and Delta C is the maximum difference of the visible light induction capability of two pixels in the range of 800-900 nm. The utility model can realize the better technical effect that the day and night dual-purpose camera has better shooting effect.
Description
[technical field]
The utility model relates to the video acquisition technical field, particularly relates to day and night camera and filter thereof, optical system.
[background technology]
Modern Digital Video mainly comprises image sensor element and picture processing chip etc.Wherein,, have two big technology main flows again for image sensor element, be respectively charge coupled device (ChargeCoupled Device, CCD) with complementary metal oxide semiconductors (CMOS) (Complementary MetalOxide Semiconductor, CMOS).
The wavelength of visible light scope is the 380-780 nanometer, and 780 nanometers are above belongs to the infrared light part, and CCD and CMOS can respond to visible light, also can respond to infrared light.When infrared light and visible light entered into CCD or CMOS simultaneously by its induction, the color color of taking the environment that the color of the image that comes out can see with human eye was inconsistent, promptly so-called colour cast.This is because infrared light destroys color rendition.So people are in order to obtain better color rendition under natural daylight, just use filter to be arranged at described CCD or filtering infrared light is come in the CMOS front.But for the thermal camera that can be applied to bright environment and dark situation simultaneously, promptly need to satisfy imaging under the bright environment and the not colour cast of trying one's best, need again to satisfy the requirement that also can see subject under the infrared lamp light source situation clearly is arranged in the environment of dark, so people just allow the infrared luminous energy of 850 nano wavebands pass through filter, the image color of attempting to satisfy in bright environment reduces, can satisfy the requirement of taking in the dark surrounds again.
For this thermal camera, generally adopt the infrared fileter of 850 nano wavebands in the market.Consult Fig. 1, described filter to the light transmittance of infrared light basically all about 90%, to satisfy the basic light requirement of carrying out infrared shooting under the dark situation.But, even only allow 850 nano wavebands of infrared part see through infrared light, but still have the infrared light of considerable part to enter CCD or CMOS to satisfy the photographing request under the dark situation, thermal camera still can be subjected to the influence of infrared light.Therefore, thermal camera natural daylight by day obtains the real image effect of color rendition down, does not just satisfy the requirement of seeing subject under the dark surrounds at night clearly; If satisfied the requirement of seeing subject night under the dark surrounds clearly, the colour cast phenomenon appears again in the image that daytime, natural daylight obtained down.Generally speaking, existing thermal camera at first needs to satisfy the requirement of seeing subject under the dark surrounds at night clearly, so all there is certain colour cast problem basically in existing thermal camera.
In disclosed Chinese invention patent application on May 21st, 2008 video camera that a kind of suitable for all-weather uses has been described for No. 200710124954.3, it comprises imageing sensor and is located at the optical filtering in this imageing sensor the place ahead, this optical filtering comprises high pass filter and low pass filter, selects to filter object line or infrared light respectively.Described patent application mainly is the optical filtering that switches imageing sensor the place ahead according to the variation of surround lighting, takes and the infrared light shooting to attempt taking into account visible light.But this method need dispose costliness, complicated optical filtering switched system, needs two optical filterings simultaneously at least, and material, maintenance cost is higher and break down easily.
[utility model content]
Be difficult to take into account the night infrared shooting and cause the technological deficiency of image colour cast on daytime for solving prior art day and night video camera with the shooting on daytime, the utility model provides a kind of day and night camera and filter thereof, optical system, can realize that natural daylight obtains the comparatively real effect of color rendition down by day, also can know the technique effect of taking subject at night under the dark surrounds.
The utility model provides a kind of day and night camera for solving the problems of the technologies described above, be used for by day making a video recording under the pattern and under the night mode, comprise: optical system, described optical system comprise camera lens, imageing sensor, the filter between described camera lens and transducer; The color correct rate of described optical system under described day mode: D＞34.15, the infrared induction rate of described optical system under night mode: E＞1.45%, wherein, described D=(Tkj * Tkl * Δ C)/(Thj * Thl * Δ CMAX), described E=(Thj * Thl * Ths); Described Tkj is the light transmittance of described camera lens to visible light, Tkl is the light transmittance of described filter to visible light, Thj is that described camera lens is to infrared average transmittance between the 800-900 nanometer, Thl is that described filter is to infrared average transmittance between the 800-900 nanometer, Ths is the sensing capability of described imageing sensor to 800-900 nanometer infrared light, Δ CMAX is that each pixel of RGB is to the maximum disparity between the average sensing capability of infrared light between the 800-900 nanometer in the described imageing sensor, and Δ C is that two kinds of pixels described in the Δ CMAX are to the maximum disparity between the visible light sensing capability.
The utility model provides a kind of filter that is applied to day and night camera for solving the problems of the technologies described above, described filter to infrared average transmittance between 800～900 nanometers between 5%～35%.
The utility model provides a kind of optical system that is applied to day and night camera for solving the problems of the technologies described above, comprise imageing sensor, the described optical system energy proportion that its visible light and infrared light finally arrive for described image sensor senses under the pattern by day is greater than 34.15, and described optical system its infrared light under night mode to enter before the described optical system with entering the energy proportion that finally arrives for described image sensor senses after the described optical system be greater than 1.45%.
The beneficial effects of the utility model are: be different from prior art day and night video camera and be difficult to take into account infrared shooting and take daytime and cause the situation of image colour cast on daytime at night, the utility model is by carrying out qualitative and quantitative analysis to day and night video camera colour cast reason, design the infrared induction rate of optical system under night mode earlier: E＞1.45%, guarantee to receive enough infrared lights to carry out normal infrared shooting in the dark situation, simultaneously, color correct rate when research obtains realizing under the natural daylight shooting situation by day basic bias colour phenomenon, prior art significantly reduces the light transmittance of whole optical system to 850 nano wavebands relatively under the condition that satisfies described color correct rate, realize reducing the destruction of infrared light, make video camera under natural daylight, also can obtain the preferable shooting effect of color rendition the image color reduction.
Further, experiment shows with practice in large quantities, when 850 nano waveband light transmittances of filter are between 5%～35%, the color rendition of image in the time of can satisfying day mode and take, can satisfy the requirement of under the light filling lighting environment that 850 nano waveband infrared lamps are arranged, knowing subject in the dark again.
[description of drawings]
Fig. 1 is the spectrum schematic diagram of the prior art infrared fileter that is applied to the day and night video camera;
Fig. 2 is that solar irradiation is mapped on the subject, the subject reflection ray is to the schematic diagram of video camera;
Fig. 3 is the change curve schematic diagram of visible light and the relative radiation ratio of the near infrared light of wavelength 800-900 nanometer in a day;
Fig. 4 is the spectrum schematic diagram of the utility model infrared fileter of being applied to day and night camera;
Fig. 5 is the schematic diagram of the sensing capability of the utility model each pixel of imageing sensor of being applied to day and night camera with spectrum change;
Fig. 6 is the schematic diagram that video camera carries out infrared shooting in the night mode;
Fig. 7 is the energy curve figure of the auxiliary camera infrared lamp that carries out infrared shooting;
Fig. 8 is the structural representation of the utility model day and night camera.
[specific embodiment]
The inventor is through discovering, prior art day and night video camera is difficult to take into account infrared shooting and take daytime and cause the basic reason of image colour cast on daytime at night, be that to enter the natural daylight and the infrared light ratio of video camera when taking daytime low excessively, more underlying causes is the shades of colour infrared light proportional imbalance that enters in the video camera.Below, the inventor is by furtheing investigate the optical imagery process under daytime screening-mode and the night screening-mode respectively, and finds the method that solves the prior art problem:
Daytime infrared light video camera is taken in the destruction of color:
1) object reverberation
Fig. 2 is that solar irradiation is mapped on the subject, the subject reflection ray is to the schematic diagram of video camera.Fig. 3 is the change curve schematic diagram of visible light and the relative radiation ratio of the near infrared light of wavelength 800-900 nanometer in a day.Herein, the near infrared light of alleged 800-900 nanometer, 850 nano waveband infrared lights all be convenient the utility model is described and for example, according to the utility model spirit, can make a general reference the infrared light of any suitable application.
Is owing to taking the period mid-infrared light daytime when the sun sets to the photographic images color bigger time of influence, and the colour cast problem that solves this time period is the most key, the visible light in therefore following this period object reverberation of analysis earlier and the energy ratio of infrared light.
Colour temperature when wherein, the sun sets in one day is greatly about about 3000K-4000K.The relative radiation ratio of visible light at this time is 0.15, and the relative radiation ratio of infrared light 800-900 wave band is 0.36, and their energy emission is respectively:
K0＝(700-400)×0.15×u
K1＝(900-800)×0.36×u
And the reflection ratio of the visible light in the object reverberation is a0, and the reflection ratio of infrared light is a1, so visible light and wavelength are that the energy of the infrared light of 800-900 nanometer is respectively in the object reverberation:
P0＝K0×a0
P1＝K1×a1
Common and reflective infrared is very strong that leaf is arranged in living environment, especially there is the leaf of dust on the surface, and dust absorption portion visible light.And greenery are more common in the actual environment, and are that reflects infrared light is very strong, in an implementation method of the present utility model, are to represent all objects reflects infrared light video camera to be carried out the color influence of taking daytime with the leaf reflects infrared light therefore.That is to say, the color that video camera carries out taking daytime is influenced, just overcome the colour cast problem in the screening-mode on daytime as long as overcome the leaf reflects infrared light.Describe for convenient, the analytic process of back is also based on this example.
Therefore, the catoptrical energy ratio of object is less than visible light in the above-mentioned leaf and infrared energy ratio: during F=P0/P1, can think that the color of image of taking in the video camera begins variation.
Except the catoptrical situation of need object analysis, also need analyze light finally sensed by the video camera imageing sensor before related various piece, comprise camera lens, filter and imageing sensor itself, below analyze respectively:
2) camera lens:
In the day and night video camera, generally the infrared lens that uses is the full impregnated camera lens, is 90% to seeing through of all light, through the visible light behind the camera lens and the infrared energy of 800-900 nanometer is:
J0＝P0×90％
J1＝P1×90％
3) filter:
In the day and night video camera, its principle of the infrared fileter of the 850IR of all uses at ordinary times as shown in Figure 1.Wherein, the average transmittance of the near infrared light of wavelength 800-900 nanometer is 75%.
Therefore, among the embodiment of the present utility model, be to adopt special infrared fileter effectively to suppress the destruction of infrared light to the color of shot by camera image.Consult Fig. 4, the light transmittance of the visible light of described infrared fileter is 90%, and the near infrared light average transmittance of wavelength 800-900 nanometer is between 5%-35%.
So, be that solar radiation reflects gained on greenery energy is at the object reverberation:
L0＝90％×J0
L1max＝35％×J1
L1min＝5％×J1
Among the embodiment of the present utility model, for compensation because of the night mode hypograph transducer that adopts above-mentioned average transmittance and may reduce at the infrared fileter of 5%-35% induction amount to infrared light, can improve the light sensing ability of described imageing sensor, such as, adopt cmos image sensor to respond to light.
In video camera, the collection of image is to judge by the algorithm of an automatic exposure whether current brightness meets the demands.And in the video camera that adopts described cmos image sensor, then be to utilize the time of opening of the electronic shutter of each pixel of control to realize.After electronic shutter was opened, light entered each pixel, became the corresponding signal of telecommunication by opto-electronic conversion then.Here pixel is exactly the schematic diagram that the sensing capability of imageing sensor described herein is followed spectrum change to the transformation efficiency of each light wave band.
Among the embodiment of the present utility model, the curve that the sensing capability of the imageing sensor that is adopted is followed spectrum change as shown in Figure 5.Wherein, described imageing sensor is 37.9%, is 32.3% to the sensing capability of the infrared light of 800-900 nanometer the average sensing capability of visible light.
At reflected by objects monochromatic light only, the wave band of light is that between the 520-540 nanometer, the photoelectric effect of this band image inductor is respectively:
Tg0=31.6% * L0,31.6% is the visible light conversion efficiency of pixel G;
Tr0=5.7% * L0,5.7% is the visible light conversion efficiency of pixel R;
Tb0=7.8% * L0,7.8% is the visible light conversion efficiency of pixel B;
Photoelectric effect at the near infrared light of wave band 800-900 nanometer is respectively:
Tg1max=9.17% * L1max, Tg1min=9.17% * L1min, 9.17% is the conversion efficiency of pixel G;
Tr1max=11.12% * L1max, Tr1min=11.12% * L1min, 11.12% is the conversion efficiency of pixel R;
Tb1max=11.07% * L1max, Tb1min=11.07% * L1min, 11.07% is the conversion efficiency of pixel B;
By on can know that the RGB array of imageing sensor is different in the photoelectric effect of infrared induction, the versicolor ratio of the infrared ray of promptly sensing is different, so cause distortion of shot by camera color of image or change under the screening-mode on daytime.Because wherein the value of Tg1 is minimum, so when the infrared light of coming in is too many, may cause the deviation of color.
In sum:
T0max(R，G，B)＝(Tr0+Tr1max，Tg0+Tg1max，Tb0+Tb1max)
True colors: Tt (R, G, B)=(Tr0, Tg0, Tb0)
Infrared light as herein described is exactly because the value ratio mismatch of Tr1max, Tg1max, Tb1max to the influence of color. and in the time of Tb0+Tb1max＞Tg0+Tg1max, color relation distorts.
The value of certain Tr1max, Tg1max, Tb1max, the ratio that accounts in whole ratio is few more, and is just few more to the destruction of color.
Repeatedly test through the inventor: (Tr0+Tr1max, Tg0+Tg1max Tb0+Tb1max) can accept the maximum of the distortion of color down for screening-mode by day to T0max.In the test experiments example, greenery are the most cureless color.The ratio of middle by day object reflect visible light and object reflection 800-900 nanometer infrared light, because this ratio can not change, so can make the greenery color not distort to the ratio between visible light and the 800-900 nanometer infrared light by regulating filter, just to satisfy Tr0+Tr1max＜Tg0+Tg1max, Tb0+Tb1max＜Tg0+Tg1max.
Proof remains on 90% in visible light transmittance rate when filter by experiment, and the light transmittance of the infrared light of 800-900 nanometer is constantly reduced, and the color reduction degree improves constantly, when average transmittance 35% following the time, color distorts smaller.
According to top analysis, provide color correct rate of the present utility model here and be defined as follows:
By day under the pattern, a branch of light that comprises the near infrared light between visible light and the 800-900 nanometer, behind camera lens, filter and cmos image sensor etc., the energy proportion that its visible light and infrared light finally arrive for described image sensor senses.This light transmittance, cmos image sensor with the visible light of the light transmittance of the visible light of camera lens and infrared light, filter and infrared light is relevant to the sensing capability of visible light and infrared light, is the formula of described color correct rate D below:
D＝(Tkj×Tkl×Tks)/(Thj×Thl×Ths)
Wherein, Tkj: the light transmittance of camera lens visible light
Tkl: filter is to the light transmittance of visible light
Thj: camera lens is to 850 nanometer infrared light light transmittances
Thl: filter is to 850 nanometer infrared light light transmittances
Ths: imageing sensor is to the sensing capability of 850 nanometer infrared lights
Δ CMAX: in the RGB of imageing sensor array, RGB is respectively to maximum disparity between the sensing capability of average infrared light between the 800-900 nanometer.Sensing capability such as average infrared light between the 800-900 nanometer of the RGB in this example is (11.12%, 9.17%, 11.07%), their Δ CMAX=Tr-Tg=1.95%.
Wherein, one of arrangement mode of imageing sensor RGB array is the Bayer array, and it is to arrange in the mode of matrix.First row is arranged in the mode of R, G, R, G, R, G in adjacent two row, and second row is arranged in the mode of G, B, G, B, G, B, and the rest may be inferred.
The quantity of pixel G is the twice of pixel R, B in the above-mentioned pixel arrangement mode, because human eye is relatively more responsive to green.Each element carries out interpolation in need be to array when image restoring.Green with the center is an example, and this color has only G, lacks R and B, and R just equals the mean value of two R up and down, the mean value of two B about B just equals.Other R is the same with B, and each pixel is all wanted polishing RGB three looks.
Δ C: for two kinds of pixels described in the Δ CMAX to the maximum disparity between the visible light sensing capability, such as MT9V136 type imageing sensor, its Δ C is the gap Δ C=31.6%-5.7%=25.9% between R and the G.
So D＞(90% * 90% * 25.9%)/(90% * 35% * 1.95%),
D＞34.15
850 nanometer infrared lights are defined as: the infrared light between the 800-900 nanometer, according to inventor's lot of experiment validation, when D greater than 34.15 the time, the color of image that shot by camera arrives can be accepted for people.
2. night vision effect
Fig. 6 is the schematic diagram that video camera carries out infrared shooting in the night mode.Fig. 7 is the energy curve figure of the auxiliary camera infrared lamp that carries out infrared shooting.
As can be known, the concentration of energy of infrared light is between 800-900 among the figure, and energy value is the highest in the time of 850 nanometers, with the spectrogram unanimity of filter.Infrared energy is successively decreased along with the distance that transmits, and in the applied environment and existing market of reality, video camera can use 32 infrared lamps in 15 meters distances.
Illustrate as an example with 32 infrared lamps below:
The emitted energy of single LEDs infrared lamp is: b
32 infrared lamp energy are B0=32 * b
In black night evening, can think that amount of visible light is 0, be B0 so enter the energy of camera lens.
1) camera lens:
Can know that by top argumentation the aglow outer ability of camera lens is 90%, so the luminous energy value behind the process camera lens is J0=90%B0.
2) filter:
Can be known by top argumentation, use dedicated optical filter of the present utility model, its aglow outer ability is 5%～35%, so the luminous energy value after the mating plate is after filtration:
L0min＝5％·J0
L0max＝35％·J0
3) cmos image sensor:
Know that by top argumentation the infrared ability of the sense of conventional images product sensor is:
R0min＝11.12％·L0min，R0max＝11.12％·L0max
G0min＝9.17％·L0min，G0max＝9.17％·L0max
B0min＝11.07％·L0min，B0max＝11.07％·L0max
Show T0min (R0min, G0min, the minimum value that brightness B0min) can be accepted for people through a large amount of experimental tests of inventor.
According to last surface analysis, the utility model provides infrared inductivity and is defined as follows:
A branch of light (having 800-900 nanometer infrared light) arrives cmos image sensor at last by camera lens, filter, and the energy ratio of the 800-900 nanometer infrared light of the energy that can experience in imageing sensor and this Shu Guangzhong is described infrared induction rate E.
E＝(Thj?×Thl×Ths)
Thj: camera lens is to 800-900 infrared light light transmittance
Thl: filter is to 800-900 nanometer infrared light light transmittance
Ths: imageing sensor is to the sensing capability of 800-900 nanometer infrared light
850 nanometer infrared lights are defined as: the infrared light between the 800-900.Imageing sensor is 32.3% to the sensing capability of the infrared light of 800-900nm, through test of many times, when E＞90% * 5% * 32.3%, when being E＞1.45%, can think that people can accept the infrared shooting effect under the pitch-dark environment.
Analysis by top 1 and 2 can be known: in the prior art aglow outer ability and daytime color be a pair of contradiction that cannot be in harmonious proportion.But, draw:, in the time of infrared induction rate E＞1.45%, be to be in harmonious proportion this solution contradiction when color correct rate D＞34.15 through the inventor's further investigation and a large amount of experiments.
Can obtain better night vision effect when making infrared induction rate E＞1.45%, among the embodiment of the present utility model, in video camera, use cmos image sensor of new generation, such as the MT9V126 of the stronger APTINA company of photoperceptivity or MT9V136 type imageing sensor etc. described imageing sensor has stronger photoperceptivity than conventional image sensor. as discovering of above-mentioned inventor, by reducing the light transmittance to 850 nano wavebands such as infrared fileter, can realize reducing the destruction of infrared light to the image color reduction, make video camera under natural daylight, also can obtain the preferable image effect of color rendition. for this reason, the utility model proposes following various embodiment:
Consult Fig. 8, the utility model proposes a kind of day and night camera, be used for by day making a video recording under the pattern and under the night mode, comprising:
Optical system, described optical system comprise camera lens, imageing sensor, the filter between described camera lens and transducer;
The color correct rate of described optical system under described day mode: D＞34.15, the infrared induction rate of described optical system under night mode: E＞1.45%,
Wherein,
Described D=(Tkj * Tkl * Δ C)/(Thj * Thl * Δ CMAX), and described E=(Thj * Thl * Ths);
Described Tkj is the light transmittance of described camera lens to visible light, Tkl is the light transmittance of described filter to visible light, Thj is that described camera lens is to infrared average transmittance between the 800-900 nanometer, Thl is that described filter is to infrared average transmittance between the 800-900 nanometer, Ths is the sensing capability of described imageing sensor to 800-900 nanometer infrared light, Δ CMAX be in the described imageing sensor each pixel of RGB to the maximum disparity between the average sensing capability of infrared light between the 800-900 nanometer, Δ C be two kinds of pixels described in the Δ CMAX to the maximum disparity between the visible light sensing capability, two kinds of pixels among the described Δ C are meant and have the pairing two kinds of pixels of maximum disparity between the Δ CMAX mid-infrared light sensing capability.
Present embodiment is to utilize above-mentioned result of study, and the color correct rate that makes the camera optics system is greater than 34.15, just makes the optical system energy proportion that its visible light and infrared light finally arrive for described image sensor senses under the pattern by day greater than 34.15.Greater than this ratio, can make the image mid-infrared light of taking daytime minimum to the destruction of image color reduction, at 34.15 these numerical value, can think that basic bias colour phenomenon produces maybe can stand less colour cast phenomenon;
And the infrared induction rate that makes the camera optics system is greater than 1.45%, and it is greater than 1.45% that described optical system its infrared light under night mode is being entered before the described optical system with entering the energy proportion that finally arrives for described image sensor senses after the described optical system.Greater than this ratio, can make to carry out normal infrared shooting night, at 1.45% this numerical value, can think basic and can carry out normal infrared shooting, can shoot substantially clearly object.
The color correct rate greater than 34.15 and the infrared induction rate greater than 1.45% standard under, can design the optical system of the utility model day and night camera arbitrarily, such as designing its filter separately, make it satisfy above-mentioned standard, or comprehensive Design filter and imageing sensor, or separately designed image transducer, camera lens or the like.
Be appreciated that, be different from prior art day and night video camera and be difficult to take into account infrared shooting and take daytime and cause the situation of image colour cast on daytime at night, the utility model is by analyzing day and night video camera colour cast reason, design the infrared induction rate of optical system under night mode earlier: E＞1.45%, guarantee to receive enough infrared lights to carry out normal infrared shooting in the dark situation, simultaneously, color correct rate when research obtains realizing under the natural daylight shooting situation by day basic bias colour phenomenon, prior art significantly reduces the light transmittance of whole optical system to 850 nano wavebands relatively under the condition that satisfies described color correct rate, realize reducing the destruction of infrared light, make video camera under natural daylight, also can obtain the preferable shooting effect of color rendition the image color reduction.
Further, experiment shows with practice in large quantities, when 850 nano waveband light transmittances of filter are between 5%～35%, the color rendition of image in the time of can satisfying the day mode shooting, can satisfy again in the dark under the light filling lighting environment that 850 nano waveband infrared lamps are arranged, see clearly subject.
In one embodiment, the described Tkj of D=in the described formula (Tkj * Tkl * Δ C)/(Thj * Thl * Δ CMAX) is 90%, and Tkl is 90%, and Δ C is 25.9%, and Thj is 90%, and Thl is less than 35%, and Δ CMAX is 1.95%.
(Thj of Thj * Thl * Ths) is 90% to E=in the described formula, and Thl is greater than 5%, and Ths is 32.3%.
Also be that relative prior art only changes the light transmittance of filter to infrared light.
In another embodiment, described Tkj is 90%, Tkl is 90%, Δ CMAX is 1.95%, Thj is 90%, Ths is 32.3%, Δ C is 25.9%, the numerical value of described Thl is preferably 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34% between 5%～35%.
Certainly, above-mentioned filter only illustrates the light transmittance of infrared light, and more embodiment can also be arranged, such as the numerical value of described Thl preferably between 17%～20%, as 17.5%, 18.6% or 19.4%, or preferably between 22%～26% or the like.
The utility model also provides a kind of filter that is applied to day and night camera, described filter to infrared average transmittance between 800～900 nanometers between 5%～35%.
Above-mentioned filter is to be exclusively used in the utility model day and night video camera, only uses a tablet filter, can realize that video camera takes the technique effect of or not sufficiently clear in colour cast, night daytime.
Above-mentioned filter is preferably 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34% to infrared average transmittance between 800～900 nanometers.
The utility model also provides a kind of optical system that is applied to day and night camera, comprises imageing sensor,
The described optical system energy proportion that its visible light and infrared light finally arrive for described image sensor senses under the pattern by day is greater than 34.15,
And it is greater than 1.45% that described optical system its infrared light under night mode is entering before the described optical system with entering the energy proportion that finally arrives for described image sensor senses after the described optical system.
Among this optical system embodiment, it is improvement in certain element that described ratio 34.15 and 1.45% design do not limit, it can be the design of any related elements in the optical system, also can be the matching design of two or two relevant optical, to reach the requirement of satisfying ratio 34.15 and 1.45% jointly.
Such as, except described imageing sensor, described optical system comprises camera lens and the filter between described camera lens and imageing sensor that is arranged at described imageing sensor front, between 5%～35%, described imageing sensor can be the MT9V126 or the MT9V136 type imageing sensor of APTINA company to infrared average transmittance between 800～900 nanometers for described camera lens or filter.
The utility model also provides a kind of day and night camera, comprise optical system, described optical system comprises imageing sensor, the infrared unbalance rate of described optical system: F=H/D＜3/155, the infrared induction rate of described optical system under night mode: E＞1.45%
Wherein,
H＝(3·Tg1max-Tg1max-Tr1max-Tb1max)/(3·Tg1max+3·Tr1max+3·Tb1max)；
Described Tg1max, Tr1max, Tb1max are respectively that pixel G, R, the B of described imageing sensor is to the conversion efficiency from common infrared strong reflection object of reference infrared light, described D is the optical system energy proportion that its visible light and infrared light finally arrive for described image sensor senses under the pattern by day. described common infrared strong reflection object of reference, greenery etc. as the aforementioned.
As mentioned before, infrared light as herein described is exactly because the value ratio mismatch of Tr1max, Tg1max, Tb1max to the influence of color.In the time of Tb0+Tb1max＞Tg0+Tg1max, color relation distorts.The ratio of Tg1max/T0max has individual limiting value, and surpassing this limiting value promptly is unacceptable colour cast phenomenon, thinks then that smaller or equal to this value bias colour or colour cast phenomenon can accept.Present embodiment replaces Tg1max/T0max with another kind of Parameter H, and infrared unbalance rate H is smaller or equal to 3/155 o'clock, can think that bias colour or colour cast phenomenon can accept.Simultaneously, present embodiment also defines the minimum infrared induction rate under night mode, promptly greater than 1.45%, takes to video camera so that enough infrared lights to be provided at night, and takes into account infrared shooting and taking daytime at night.
Equally, described D=(Tlk * Tkl * Δ C)/(Thj * Thl * Δ CMAX)＞34.15, described Tkj is the light transmittance of described camera lens to visible light, Tkl is the light transmittance of described filter to visible light, Thj is that described camera lens is to infrared average transmittance between the 800-900 nanometer, Thl is that described filter is to infrared average transmittance between the 800-900 nanometer, Δ CMAX is that each pixel of RGB is to the maximum disparity between the average sensing capability of infrared light between the 800-900 nanometer in the described imageing sensor, and Δ C is that two kinds of pixels described in the Δ CMAX are to the maximum disparity between the visible light sensing capability.
What deserves to be explained is that among each embodiment of the utility model, the type of imageing sensor is not limited only to the CMOS type, can be the stronger CCD type of sensing capability.The utility model day and night camera can comprise auxiliary infrared lamp, also can not comprise auxiliary infrared lamp, decides on actual conditions.
The above only is embodiment of the present utility model; be not so limit claim of the present utility model; every equivalent structure or equivalent flow process conversion that utilizes the utility model specification and accompanying drawing content to be done; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present utility model.
Claims (8)
1. day and night camera is used for by day under the pattern and makes a video recording under the night mode, comprising:
Optical system, described optical system comprise camera lens, imageing sensor, the filter between described camera lens and transducer;
It is characterized in that,
The color correct rate of described optical system under described day mode: D＞34.15, the infrared induction rate of described optical system under night mode: E＞1.45%,
Wherein,
Described D=(Tkj * Tkl * Δ C)/(Thj * Thl * Δ CMAX), and described E=(Thj * Thl * Ths);
Described Tkj is the light transmittance of described camera lens to visible light, Tkl is the light transmittance of described filter to visible light, Thj is that described camera lens is to infrared average transmittance between the 800-900 nanometer, Thl is that described filter is to infrared average transmittance between the 800-900 nanometer, Ths is the sensing capability of described imageing sensor to 800-900 nanometer infrared light, Δ CMAX is that each pixel of RGB is to the maximum disparity between the average sensing capability of infrared light between the 800-900 nanometer in the described imageing sensor, and Δ C is that two kinds of pixels described in the Δ CMAX are to the maximum disparity between the visible light sensing capability.
2. day and night camera according to claim 1 is characterized in that:
The described Tkj of D=in the described formula (Tkj * Tkl * Δ C)/(Thj * Thl * Δ CMAX) is 90%, and Tkl is 90%, and Δ C is 25.9%, and Thj is 90%, and Thl is less than 35%, and Δ CMAX is 1.95%.
3. day and night camera according to claim 2 is characterized in that:
(the described Thj of Thj * Thl * Ths) is 90% to E=in the described formula, and Thl is greater than 5%, and Ths is 32.3%.
4. day and night camera according to claim 1 is characterized in that:
Described Tkj is 90%, Tkl is 90%, Δ CMAX is 1.95%, Thj is 90%, Ths is 32.3%, Δ C is 25.9%, and the numerical value of described Thl is 5%, 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33%, 34% or 35%.
5. filter that is applied to day and night camera is characterized in that:
Described filter to infrared average transmittance between 800～900 nanometers between 5%～35%.
6. the filter that is applied to day and night camera according to claim 5 is characterized in that:
Described filter is 6%, 7%, 8%, 9%, 10%, 11%, 12%, 13%, 14%, 15%, 16%, 17%, 18%, 19%, 20%, 21%, 22%, 23%, 24%, 25%, 26%, 27%, 28%, 29%, 30%, 31%, 32%, 33% or 34% to infrared average transmittance between 800～900 nanometers.
7. an optical system that is applied to day and night camera comprises imageing sensor, it is characterized in that:
The described optical system energy proportion that its visible light and infrared light finally arrive for described image sensor senses under the pattern by day is greater than 34.15,
And it is greater than 1.45% that described optical system its infrared light under night mode is entering before the described optical system with entering the energy proportion that finally arrives for described image sensor senses after the described optical system.
8. the optical system that is applied to day and night camera according to claim 7 is characterized in that:
Described optical system comprises camera lens and the filter between described camera lens and imageing sensor that is arranged at described imageing sensor front,
Between 5%～35%, described imageing sensor is MT9V126 or MT9V136 type imageing sensor to infrared average transmittance between 800～900 nanometers for described camera lens or filter.
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| CN2009201315268U CN201467300U (en) | 2009-05-05 | 2009-05-05 | Day and night dual-purpose camera, light filter and optical system thereof |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101610355B (en) * | 2009-05-05 | 2011-03-16 | 张日和 | Day and night camera |
| CN104092980A (en) * | 2014-06-30 | 2014-10-08 | 华南理工大学 | Low-cost active near-infrared night vision system and working method thereof |
| CN104184962A (en) * | 2014-08-12 | 2014-12-03 | 中国科学院上海微系统与信息技术研究所 | DSP (digital signal processor) and image processing based all-weather image acquisition system |
| CN112135012A (en) * | 2019-06-25 | 2020-12-25 | 杭州海康威视数字技术股份有限公司 | Image acquisition device and image acquisition method |
| CN113542596A (en) * | 2021-06-29 | 2021-10-22 | 中国科学院长春光学精密机械与物理研究所 | CCD imager and imaging control method |
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2009
- 2009-05-05 CN CN2009201315268U patent/CN201467300U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101610355B (en) * | 2009-05-05 | 2011-03-16 | 张日和 | Day and night camera |
| CN104092980A (en) * | 2014-06-30 | 2014-10-08 | 华南理工大学 | Low-cost active near-infrared night vision system and working method thereof |
| CN104184962A (en) * | 2014-08-12 | 2014-12-03 | 中国科学院上海微系统与信息技术研究所 | DSP (digital signal processor) and image processing based all-weather image acquisition system |
| CN112135012A (en) * | 2019-06-25 | 2020-12-25 | 杭州海康威视数字技术股份有限公司 | Image acquisition device and image acquisition method |
| CN112135012B (en) * | 2019-06-25 | 2022-02-11 | 杭州海康威视数字技术股份有限公司 | Image acquisition device and image acquisition method |
| CN113542596A (en) * | 2021-06-29 | 2021-10-22 | 中国科学院长春光学精密机械与物理研究所 | CCD imager and imaging control method |
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