CN108289164A

CN108289164A - A kind of mode switching method and device of the video camera with infrared light compensating lamp

Info

Publication number: CN108289164A
Application number: CN201710014669.XA
Authority: CN
Inventors: 张青
Original assignee: Hangzhou Hikvision Digital Technology Co Ltd
Current assignee: Hangzhou Hikvision Digital Technology Co Ltd
Priority date: 2017-01-10
Filing date: 2017-01-10
Publication date: 2018-07-17
Anticipated expiration: 2037-01-10
Also published as: CN108289164B

Abstract

An embodiment of the present invention provides a kind of mode switching method and device of the video camera with infrared light compensating lamp, method includes：The current intensity of illumination of video camera was obtained periodically and the first scene state that a upper period determines, the first scene state includes state or night state on daytime；If the first scene state determines the scene state in this period for state on daytime according to current intensity of illumination and preset daylight intensity threshold；According to the scene state in this period, it is determined to switch to night mode or keeps day mode；If the first scene state is night state, image when according to the current intensity of illumination of acquisition calculates and obtains current red component/green component ratio；According to current intensity of illumination, the threshold value of current red component/green component ratio, night intensity of illumination threshold value and preset red component/green component ratio, the scene state in this period is determined；According to the scene state in this period, it is determined to switch to day mode or keeps night mode.

Description

A kind of mode switching method and device of the video camera with infrared light compensating lamp

Technical field

The present invention relates to field of cameras, more particularly to a kind of pattern switching side of the video camera with infrared light compensating lamp Method and device.

Background technology

Need the video camera to work under the different illumination intensities such as daytime, night, common configuration infrared light compensating lamp and infrared Optical filter automatically switches the pattern of camera operation by judging scene state.The one mode switching side of existing video camera Method is：Using intensity of illumination and preset threshold value comparison, when intensity of illumination is more than threshold value, determine that scene state is shape on daytime Pattern switching is day mode, closes infrared light compensating lamp by state, and infrared fileter is switched to the infrared optical mode of cut-off, is prevented Infrared light, which enters, causes image color cast；When intensity of illumination is less than or equal to threshold value, determine that scene state is night state, by mould Formula is switched to night mode, opens infrared light compensating lamp, and infrared fileter is switched to infrared light responsive pattern, promotes night vision effect.

As it can be seen that the mode switching method of the prior art is judged, to determine scene state, to judge using only intensity of illumination Accuracy it is not high, cause camera mode switch accuracy it is not high.

Invention content

A kind of mode switching method for being designed to provide the video camera with infrared light compensating lamp of the embodiment of the present invention and Device, to improve the accuracy of camera mode switching.Specific technical solution is as follows：

An embodiment of the present invention provides a kind of mode switching methods of the video camera with infrared light compensating lamp, including：

The first scene state that the current intensity of illumination of acquisition video camera and a upper period determine periodically, described first Scene state includes state or night state on daytime；

If first scene state is state on daytime, according to the current intensity of illumination and preset daylight Intensity threshold determines the scene state in this period；

According to the scene state in described period, it is determined to switch to night mode or keeps day mode；

If first scene state is night state, according to image when obtaining the current intensity of illumination, meter It calculates and obtains current red component/green component ratio；

According to the current intensity of illumination, the current red component/green component ratio, night intensity of illumination threshold The threshold value of value and preset red component/green component ratio, determines the scene state in this period；

According to the scene state in described period, it is determined to switch to day mode or keeps night mode.

Optionally, described the step of obtaining the current intensity of illumination of video camera periodically, including：

A length of period, imaging sensor amplifying circuit when obtaining shooting current frame image when corresponding with one frame image of shooting Current gain and current exposure time；

Calculate the average value of red pixel component, the average value of green pixel component and the blue pixel point of current frame image The average value of amount；

According to the average value of the red pixel component, the average value of the green pixel component and the blue pixel point The average value of amount calculates the average brightness for obtaining current frame image；

According to the average brightness of the current frame image, the current gain and the current exposure time, obtain current Intensity of illumination；

The calculating obtains the step of current red component/green component ratio, is：It calculates and obtains the red pixel point The ratio of the average value of amount and the average value of the green pixel component.

Optionally, if first scene state is state on daytime, according to the current intensity of illumination and in advance If daylight intensity threshold, the step of determining the scene state in this period, including：

In the case where first scene state is state on daytime, judge whether to meet the first decision condition, and full In the case of foot first decision condition, by switching points plus the first preset quantity；Do not meeting first decision condition In the case of, it will the switching points preset quantity that subtracts the second；First decision condition is：Current intensity of illumination is less than preset Daylight intensity threshold；

Judge whether switching points are more than preset switching points threshold value, if so, determining that the scene state in this period is Night state, and switching points are reset；If not, it is determined that the scene state in this period is state on daytime.

Optionally, the night intensity of illumination threshold value includes：It is limited in night intensity of illumination upper limit threshold, night intensity of illumination Threshold value, preset night intensity of illumination expanded threshold value；Wherein, the night intensity of illumination upper limit threshold is more than the night illumination Threshold value is limited in intensity；

It is described strong according to the current intensity of illumination, the current red component/green component ratio, night illumination Spend the threshold value of threshold value and preset red component/green component ratio, the step of determining the scene state in this period, including：

Judge whether to meet the second decision condition, and in the case where meeting second decision condition, switching is counted Add the first preset quantity；It, will the switching points preset quantity that subtracts the second in the case where not meeting second decision condition；It is described Second decision condition is：Current intensity of illumination is greater than or equal to night intensity of illumination upper limit threshold, and is greater than or equal to night Intensity of illumination expanded threshold value, and current red component/green component ratio is less than preset red component/green component ratio Threshold value；Or, current intensity of illumination is greater than or equal to night intensity of illumination expanded threshold value, and it is strong less than or equal to night illumination Threshold value is limited in degree, and current red component/green component ratio is less than the threshold of preset red component/green component ratio Value；

Judge whether switching points are more than preset switching points threshold value, if so, determining that the scene state in this period is Daytime state, and will switching points reset；If not, it is determined that the scene state in this period is night state.

Optionally, the method further includes：

When the first scene state is state on daytime, this period switches to after night mode, obtains third preset quantity The current intensity of illumination in period, and calculate the average value for the current intensity of illumination for obtaining the third preset quantity period；

Pass through the average value of the current intensity of illumination in the third preset quantity period, preset night intensity of illumination Threshold coefficient is limited in upper limit threshold coefficient and preset night intensity of illumination, redefines night intensity of illumination upper limit threshold and night Threshold value is limited in late intensity of illumination, so that in second decision condition in period later, it is strong using the night illumination redefined Threshold value is limited in degree upper limit threshold and night intensity of illumination.

Optionally, the average value of the current intensity of illumination by the third preset quantity period, preset Threshold coefficient is limited in night intensity of illumination upper limit threshold coefficient and preset night intensity of illumination, redefines night intensity of illumination Threshold value is limited in upper limit threshold and night intensity of illumination, including：

Night intensity of illumination upper limit threshold is redefined according to formula th_high=i_avg* α and th_mid=i_avg* β And limit threshold value in night intensity of illumination；Wherein, the th_high is the night intensity of illumination upper limit threshold, and the i_avg is The average value of the current intensity of illumination in the third preset quantity period, the α are the preset night intensity of illumination Upper limit threshold coefficient, the th_mid are that threshold value is limited in the night intensity of illumination, and the β is that the preset night illumination is strong Threshold coefficient is limited in degree.

An embodiment of the present invention provides a kind of mode-changeover devices of the video camera with infrared light compensating lamp, including：

Acquisition module, the first scene for obtaining the current intensity of illumination of video camera and the determination of a upper period periodically State, first scene state include state or night state on daytime；

First scene state determining module, if being state on daytime for first scene state, according to described current Intensity of illumination and preset daylight intensity threshold, determine the scene state in this period；

First mode handover module is determined to switch to night mode or guarantor for the scene state according to described period Hold day mode；

Night state computation module, it is described current according to obtaining if being night state for first scene state Intensity of illumination when image, calculate and obtain current red component/green component ratio；

Second scene state determining module, for according to the current intensity of illumination, the current red component/green The threshold value of colouring component ratio, night intensity of illumination threshold value and preset red component/green component ratio, determines the field in this period Scape state；

Second mode handover module is determined to switch to day mode or guarantor for the scene state according to described period Hold night mode.

Optionally, the acquisition module, including：

Gain and time for exposure acquisition submodule, in a length of period, obtain shooting when being used for corresponding with one frame image of shooting The current gain and current exposure time of imaging sensor amplifying circuit when current frame image；

Pixel component computational submodule, average value, the green pixel of the red pixel component for calculating current frame image The average value of the average value and blue pixel component of component；

Average brightness computational submodule, for average value, the green pixel component according to the red pixel component Average value and the blue pixel component average value, calculate obtain current frame image average brightness；

Intensity of illumination computational submodule, for the average brightness, the current gain and institute according to the current frame image Current exposure time is stated, current intensity of illumination is obtained；

The night state computation module, is specifically used for：Calculate obtain the average value of the red pixel component with it is described The ratio of the average value of green pixel component.

Optionally, the first scene state determining module, including：

First decision sub-module, in the case where first scene state is state on daytime, judging whether to meet First decision condition, and in the case where meeting first decision condition, by switching points plus the first preset quantity；Less than It, will the switching points preset quantity that subtracts the second in the case of foot first decision condition；First decision condition is：Current Intensity of illumination is less than preset daylight intensity threshold；

First scene state determination sub-module, for judging whether switching points are more than preset switching points threshold value, if It is, it is determined that the scene state in this period is night state, and switching points are reset；If not, it is determined that the scene in this period State is state on daytime.

The second scene state determining module, including：

Second decision sub-module meets the second decision condition for judging whether, and is meeting second decision condition In the case of, by switching points plus the first preset quantity；In the case where not meeting second decision condition, switching is counted The preset quantity that subtracts the second；Second decision condition is：Current intensity of illumination is greater than or equal to night intensity of illumination upper limit threshold Value, and it is greater than or equal to night intensity of illumination expanded threshold value, and current red component/green component ratio is less than preset red The threshold value of colouring component/green component ratio；Or, current intensity of illumination is greater than or equal to night intensity of illumination expanded threshold value, and Less than or equal to limiting threshold value in night intensity of illumination, and current red component/green component ratio is less than preset red point The threshold value of amount/green component ratio；

Second scene state determination sub-module, for judging whether switching points are more than preset switching points threshold value, if It is, it is determined that the scene state in this period is state on daytime, and switching points are reset；If not, it is determined that the scene in this period State is night state.

Optionally, the first mode handover module, including：

First mode keeps submodule, for being state on daytime according to the scene state in described period, determines and keeps white Day mode；

First mode switching submodule is determined to switch to for being night state according to the scene state in described period Night mode；

Described device further includes：

Intensity of illumination mean value calculation module, for being state on daytime when the first scene state, the first mode switching After this period is switched to night mode by submodule, the current intensity of illumination in third preset quantity period is obtained, and is counted Calculate the average value for the current intensity of illumination for obtaining the third preset quantity period；

Night intensity of illumination threshold calculation module, for strong by the current illumination in the third preset quantity period Threshold coefficient is limited in the average value of degree, preset night intensity of illumination upper limit threshold coefficient and preset night intensity of illumination, weight New determine in night intensity of illumination upper limit threshold and night intensity of illumination limits threshold value, so that second in the period later judges item In part, using limiting threshold value in the night intensity of illumination upper limit threshold and night intensity of illumination redefined.

Optionally, the night intensity of illumination threshold calculation module, is specifically used for：

The mode switching method and device of video camera provided in an embodiment of the present invention with infrared light compensating lamp, first period The first scene state that ground obtains the current intensity of illumination of video camera and a upper period determines.If the first scene state is daytime State determines the scene state in this period then according to current intensity of illumination and preset daylight intensity threshold, and according to The scene state in this period is determined to switch to night mode or keeps day mode；If the first scene state is night state, Image when according to the current intensity of illumination of acquisition, calculates and obtains current red component/green component ratio, according to current Intensity of illumination, current red component/green component ratio, night intensity of illumination threshold value and preset red component/green point The threshold value for measuring ratio, determines the scene state in this period, and according to the scene state in this period, be determined to switch to day mode or Keep night mode.

The embodiment of the present invention is utilized in the case where infrared light compensating lamp is opened, and red component caused by infrared external reflection light/ The larger principle of green component ratio, daytime state and when night state using the decision condition of different scene states, When night state, not merely with current intensity of illumination and night intensity of illumination threshold value comparison, red component/green point is also introduced Measure ratio and preset red component/green component ratio threshold value comparison, compared with the prior art be used only intensity of illumination and For intensity of illumination threshold value comparison to determine scene state, the decision condition of the embodiment of the present invention is more fine, can obtain accuracy The judging result of higher scene state, so as to obtain the higher pattern switching result of accuracy.Certainly, implement the present invention Any product or method must be not necessarily required to reach all the above advantage simultaneously.

Description of the drawings

In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with Obtain other attached drawings according to these attached drawings.

Fig. 1 is a kind of flow chart of the mode switching method of the video camera with infrared light compensating lamp of the embodiment of the present invention；

Fig. 2 is another flow of the mode switching method of the video camera with infrared light compensating lamp of the embodiment of the present invention Figure；

Fig. 3 changes over time signal for red component/green component ratio in the mode handover procedure of the embodiment of the present invention Figure；

Fig. 4 changes over time schematic diagram for intensity of illumination in the mode handover procedure of the embodiment of the present invention corresponding with Fig. 3；

Fig. 5 is a kind of structure chart of the mode-changeover device of the video camera with infrared light compensating lamp of the embodiment of the present invention；

Fig. 6 is another structure of the mode-changeover device of the video camera with infrared light compensating lamp of the embodiment of the present invention Figure.

Specific implementation mode

Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other Embodiment shall fall within the protection scope of the present invention.

The embodiment of the invention discloses a kind of mode switching methods and device of the video camera with infrared light compensating lamp, can Improve the accuracy of camera mode switching.It a kind of is taken the photograph first below with infrared light compensating lamp to provided in an embodiment of the present invention The mode switching method of camera is introduced.

The video camera to work under the different illumination intensities such as daytime, night, common configuration infrared light compensating lamp and infrared filtering Piece, by intensity of illumination and preset threshold value comparison, the automatic judgement for carrying out scene state, and according to the judgement knot of scene state Fruit carries out the pattern switching of video camera.But the mode switching method of the prior art is judged using only intensity of illumination to determine field The accuracy of scape state, judgement is not high, causes the accuracy of the pattern switching of video camera not high.

The embodiment of the present invention uses different decision conditions for state on daytime and night state, is being for a upper period When night state, by current intensity of illumination and multiple night intensity of illumination threshold value comparisons, while by current red component/green The threshold value comparison of colouring component ratio and preset red component/green component ratio, scene state is determined by comparing result.This For inventive embodiments using decision condition unlike the prior art, the decision condition is more fine, can obtain accuracy higher Scene state judging result, so as to obtain the higher pattern switching result of accuracy.

It is one kind of the mode switching method of the video camera with infrared light compensating lamp of the embodiment of the present invention referring to Fig. 1, Fig. 1 Flow chart.Include the following steps：

Step 101, the first scene state of the current intensity of illumination of video camera and the determination of a upper period was obtained periodically.

Intensity of illumination is by the energy of the visible light received on camera unit area.In the embodiment of the present invention, with illumination The size of intensity weighs the degree of strength of camera environment light.

The period of the embodiment of the present invention is the time span according to settings such as industrial requirement or camera properties, and the period is with the second Or the meters such as millisecond.Such as, a length of period when the embodiment of the present invention can be corresponding with one frame image of shooting, wherein one frame figure of shooting As corresponding duration is related to the characteristic of the imaging sensor of video camera, it is corresponding that different imaging sensors shoots a frame image Duration is different, such as 40 milliseconds.

First scene state is the scene state determined in a upper period, and the first scene state includes state or night shape on daytime State.

It should be noted that if the first scene is state on daytime, then it represents that upper period video camera is day mode, I.e.：Infrared light compensating lamp is in off state, and infrared fileter is to end infrared optical mode；If the first scene is night state, Indicate that upper period video camera is night mode, i.e.,：Infrared light compensating lamp is open state, and infrared fileter is infrared light responsive mould Formula.

Step 102, if the first scene state is state on daytime, according to current intensity of illumination and preset daylight Intensity threshold determines the scene state in this period.

In the embodiment of the present invention, when the first scene state is state on daytime, the decision condition of the scene state of use can Similarly to the prior art, i.e., to be compared using current intensity of illumination and preset daylight intensity threshold, according to than Relatively result determines the scene state in this period for state on daytime or night state.

Preset daylight intensity threshold is obtained according to industrial requirement, camera properties or a large amount of empirical datas etc. Numerical value.

Step 103, it according to the scene state in this period, is determined to switch to night mode or keeps day mode.

In the embodiment of the present invention, the scene state in this period determined according to step 102 is night state, determines video camera Pattern switching to night mode；Alternatively, the scene state in this period determined according to step 102 is state on daytime, determination is taken the photograph The pattern of camera keeps day mode.

Step 104, if the first scene state is night state, image when according to the current intensity of illumination of acquisition, meter It calculates and obtains current red component/green component ratio.

In the embodiment of the present invention, when the first scene state is night state, when according to the current intensity of illumination of acquisition Image calculates and obtains current red component/green component ratio, current red component/green component ratio is used for In scene state judgement when first scene state is night state.

Image when wherein, according to the current intensity of illumination of acquisition, calculates and obtains current red component/green component ratio Value belongs to the prior art, and this will not be repeated here.

Step 105, according to current intensity of illumination, current red component/green component ratio, night intensity of illumination threshold The threshold value of value and preset red component/green component ratio, determines the scene state in this period.

In the embodiment of the present invention, when the first scene state be night state when, the decision condition of the scene state of use with The prior art is different, i.e.,：It is not compared merely with current intensity of illumination and preset night intensity of illumination threshold value, also utilizes The threshold value of current red component/green component ratio and preset red component/green component ratio is compared, according to two A comparison result synthesis determines the scene state in this period for state on daytime or night state.

The embodiment of the present invention is for the decision condition that the first scene state is night state, than the decision condition of the prior art It is finer, the judging result accuracy higher of the scene state of acquisition.

Step 106, it according to the scene state in this period, is determined to switch to day mode or keeps night mode.

In the embodiment of the present invention, the scene state in this period determined according to step 105 is state on daytime, determines video camera Pattern switching to day mode；Alternatively, the scene state in this period determined according to step 105 is night state, determination is taken the photograph The pattern of camera keeps night mode.

As it can be seen that the mode switching method of the video camera provided in an embodiment of the present invention with infrared light compensating lamp, first period The first scene state that ground obtains the current intensity of illumination of video camera and a upper period determines.Then according to different first Scape state uses different decision conditions to obtain the judgement of scene state as a result, and carrying out video camera according to judgement result Pattern switching, i.e.,：If the first scene state is state on daytime, according to current intensity of illumination and preset daylight intensity Threshold value determines the scene state in this period, and according to the scene state in this period, is determined to switch to night mode or is kept for daytime Pattern；If the first scene state is night state, image when according to the current intensity of illumination of acquisition is calculated and is obtained currently Red/green component ratio, according to current intensity of illumination, current red component/green component ratio, night intensity of illumination The threshold value of threshold value and preset red component/green component ratio determines the scene state in this period, and according to the field in this period Scape state is determined to switch to day mode or keeps night mode.The embodiment of the present invention, which is utilized, opens in infrared light compensating lamp In the case of, infrared external reflection light causes red component/larger principle of green component ratio, daytime state and when night state adopt With the decision condition of different scene states, in night state, not merely with current intensity of illumination and night intensity of illumination Threshold value comparison also introduces the threshold value comparison of red component/green component ratio and preset red component/green component ratio, Compared with the prior art using only intensity of illumination and intensity of illumination threshold value comparison to determine that scene state, the embodiment of the present invention are sentenced Fixed condition is more fine, can obtain the judging result of the higher scene state of accuracy, so as to obtain accuracy higher Pattern switching result.

It is the video camera with infrared light compensating lamp of the embodiment of the present invention referring to Fig. 2, Fig. 2 as another embodiment Another flow chart of mode switching method.Include the following steps：

Step 211, a length of period when corresponding with one frame image of shooting, the current intensity of illumination of acquisition video camera, and on The first scene state that one period determined.Wherein, the first scene state includes state or night state on daytime.

In the embodiment of the present invention, obtain the current intensity of illumination of video camera periodically and belong to the prior art, may include with Lower step：

The first step, a length of period, imaging sensor when obtaining shooting current frame image when corresponding with one frame image of shooting The current gain and current exposure time of amplifying circuit.

In the embodiment of the present invention, the period is that video camera shoots the corresponding duration of a frame image, the figure of the duration and video camera As the characteristic correlation of sensor, which can also be configured according to industrial requirement or according to user demand.The duration with The meters such as second or millisecond.Such as with 1 second beats take the photograph 25 frame images calculate, shooting one frame image when it is 40 milliseconds a length of.

In the embodiment of the present invention, the current gain of imaging sensor amplifying circuit when shooting a current frame image is obtained Current gain and current exposure time are used for the calculating of the 4th step by Gain and current exposure time Exposure.

It should be noted that the unit of the current gain in the embodiment of the present invention needs to be converted to multiple from dB.

Second step calculates the average value of the red pixel component of current frame image, the average value and indigo plant of green pixel component The average value of colour prime component.

By existing optical knowledge it is found that light is after the color filter array of the imaging sensor of video camera, image Each pixel is the one-component in three red pixel component, green pixel component, blue pixel component components.Red pixel Component, green pixel component, blue pixel component are indicated with R component, G components, B component respectively.In the embodiment of the present invention, calculate The average value of all pixels component is denoted as the average value Ravg of red pixel component, the average value of green pixel component respectively Gavg, the average value Bavg of blue pixel component.

Third walks, according to the average value of red pixel component, the average value of green pixel component and blue pixel component Average value calculates the average brightness for obtaining current frame image.

The average brightness of one frame image is the average value of red pixel component, the average value of green pixel component, blue picture The weighting of the average value of prime component, average brightness are formulated as：

Brightness=CoefR_Y*Ravg+CoefG_Y*Gavg+CoefB_Y*Bavg

Wherein, Brightness is the average brightness of current frame image, and CoefR_Y is the weighting system of red pixel component Number, CoefG_Y are the weighting coefficient of green pixel component, and CoefB_Y is the weighting coefficient of blue pixel component.Wherein, CoefR_Y, CoefG_Y, CoefB_Y are given value.

4th step obtains current illumination according to the average brightness, current gain and current exposure time of current frame image Intensity.

The calculation formula of current intensity of illumination Illumination is：

Illumination=Brightness/Gain/Exposure

Step 212, in the case where the first scene state is state on daytime, judge whether to meet the first decision condition, In, the first decision condition is：Current intensity of illumination is less than preset daylight intensity threshold.If meeting the first judgement item Part thens follow the steps 213, by switching points plus the first preset quantity；If not meeting the first decision condition, then follow the steps 218, will the switching points preset quantity that subtracts the second, and continue to execute step 219, determine that the scene state in this period is shape on daytime State.In the embodiment of the present invention, for scene state be daytime state use the first decision condition, first decision condition with it is existing Technology is similar, and the first decision condition is formulated as：

Illumination<th_low

Wherein, Illumination is current intensity of illumination, and th_low is preset daylight intensity threshold, th_ Low is fixed value.

It should be noted that the first preset quantity and the second preset quantity are, according to industrial requirement, user demand and according to The numerical value of the settings such as a large amount of empirical datas, the first preset quantity and the second preset quantity can change according to demand.As Preferred embodiment, the first preset quantity value in the embodiment of the present invention are 1, and the second preset quantity value is 2.

Step 214, judge whether switching points are more than preset switching points threshold value th_switch, if so, executing step Rapid 215, it determines that the scene state in this period is night state, and continue to execute step 216, switching points is reset；If it is not, then Step 219 is executed, determines that the scene state in this period is state on daytime.

After the embodiment of the present invention obtains judgement result using the first decision condition, this is not determined according to judgement result immediately The scene state in period simultaneously carries out pattern switching, but accumulates multiple periods, when switching points are more than switching points threshold value, It just determines the scene state in this period and carries out pattern switching.Accumulation of the embodiment of the present invention multiple periods carry out judging to avoid The pattern of video camera caused by frequent mode switching shakes problem.

Step 217, the scene state in this period determined according to step 215 is night state, determines the pattern of video camera Switch to night mode.

Step 220, the scene state in this period determined according to step 219 is state on daytime, determines the pattern of video camera Keep day mode.

Present invention method further includes after the pattern switching to night mode that step 217 determines video camera, opening Infrared light compensating lamp is opened, infrared fileter is switched to infrared light responsive pattern；With, step 220 determine video camera pattern keep After day mode, infrared light compensating lamp is remained turned-off, it is to end infrared optical mode to keep infrared fileter.

In the embodiment of the present invention, when the first scene state is state on daytime, this period switches to after night mode, obtains The current intensity of illumination in third preset quantity period, and the current illumination for calculating the acquisition third preset quantity period is strong The average value of degree.Pass through the average value of the current intensity of illumination in third preset quantity period, preset night intensity of illumination Threshold coefficient is limited in upper limit threshold coefficient and preset night intensity of illumination, redefines night intensity of illumination upper limit threshold and night Threshold value is limited in late intensity of illumination, so that in second decision condition in period later, it is strong using the night illumination redefined Threshold value is limited in degree upper limit threshold and night intensity of illumination.Specifically include following steps：

Step 221, next frame is waited for.

Step 222, current intensity of illumination Illumination is obtained.

Step 223, the current intensity of illumination for judging whether to have obtained the third preset quantity period, specifically, sentencing The disconnected intensity of illumination Illumination for whether having obtained N frames.If so, thening follow the steps 224, the current light of N frames is calculated According to the average value i_avg of intensity；If it is not, then returning to step 221.Wherein, third preset quantity is N, and N is more than 0 Natural number, such as 10.

Step 225, night intensity of illumination is redefined according to formula th_high=i_avg* α and th_mid=i_avg* β Threshold value is limited in upper limit threshold and night intensity of illumination, so that in second decision condition in period later, using redefining Night intensity of illumination upper limit threshold and night intensity of illumination in limit threshold value.

Wherein, th_high is night intensity of illumination upper limit threshold, and i_avg is the current of third preset quantity period The average value of intensity of illumination, α are preset night intensity of illumination upper limit threshold coefficient, and th_mid is to limit threshold in night intensity of illumination Value, β are to limit threshold coefficient in preset night intensity of illumination.Different numerical value can be arranged in α and β according to demand, such as α=1.25, β =0.75.

The night intensity of illumination threshold value that present invention method is different from the prior art is a fixed value, but according to white Day mode has just been switched to average value, the night intensity of illumination upper limit threshold of the intensity of illumination in preset time period after night mode Threshold coefficient is limited in coefficient, night intensity of illumination, updates night intensity of illumination upper limit threshold, night light in the second decision condition According to limiting threshold value in intensity.Therefore, present invention method can obtain and the higher night light of existing scene state matching degree According to intensity threshold, the higher scene state judging result of accuracy is obtained, to obtain the higher pattern switching result of accuracy.

It should be noted that during the step 221 of the embodiment of the present invention to step 225, stop the judgement of scene state And pattern switching, but since the process used time is extremely short, in milliseconds, therefore have no effect on the scene shape of present invention method The accuracy of state and pattern switching.

Step 226, if the first scene state is night state, image when according to the current intensity of illumination of acquisition, meter Calculate the ratio of the average value and the average value of green pixel component that obtain red pixel component.

In the embodiment of the present invention, according to the average value for each pixel component that second step in step 211 obtains, calculating is worked as Preceding red component/green component ratio is R-G Ratio=Ravg/Gavg.

By existing optical knowledge it is found that the R-G Ratio of normal environment light are usually than the R-G of individual infrared external reflection light Ratio is small.When opening infrared light compensating lamp, the collected light of imaging sensor=normal environment light of video camera+infrared anti- Penetrate light.Therefore, camera acquisition to the R-G Ratio of image should be at the R-G Ratio of normal environment light, and it is individually red Between the R-G Ratio of external reflectance light.And the prior art, it is carried out using only current intensity of illumination when opening infrared light compensating lamp Judge, None- identified go out be due to normal environment light, or since the light of infrared light compensating lamp produces current intensity of illumination, Therefore the prior art is not high to the accuracy of the judgement of scene state.And according to existing optical knowledge it is found that opening infrared light filling In the case of lamp, if R-G Ratio are smaller, the scene state residing for video camera is bigger for shape probability of state on daytime, if R-G Ratio is bigger, and the scene state residing for video camera is bigger for night shape probability of state, therefore the case where opening infrared light compensating lamp Under, combination R-G Ratio of the embodiment of the present invention carry out judging to be reasonable and effective to scene state.

Step 227, judge whether to meet the second decision condition, wherein the second decision condition is：Current intensity of illumination is big In or be equal to night intensity of illumination upper limit threshold, and be greater than or equal to night intensity of illumination expanded threshold value, and current red point Amount/green component ratio is less than the threshold value of preset red component/green component ratio；Or, current intensity of illumination be more than or Equal to night intensity of illumination expanded threshold value, and it is less than or equal in night intensity of illumination and limits threshold value, and current red component/green Colouring component ratio is less than the threshold value of preset red component/green component ratio, if meeting the second decision condition, executes step Rapid 228, by switching points plus the first preset quantity；If not meeting the second decision condition, 233 are thened follow the steps, by switching point Preset quantity that number subtracts the second, and step 234 is continued to execute, determine that the scene state in this period is night state.

It is that night state uses the second decision condition, second decision condition for scene state in the embodiment of the present invention Unlike the prior art, the second decision condition is formulated as：

Illumination >=th_high and Illumination >=th_ext and R-G Ratio<R or

Illumination >=th_ext and Illumination≤th_mid and R-G Ratio<R

Wherein, Illumination is current intensity of illumination, and th_high is night intensity of illumination upper limit threshold, th_ Mid is that threshold value is limited in night intensity of illumination, and th_ext is preset night intensity of illumination expanded threshold value, and R-G Ratio are current Red component/green component ratio, R be preset red component/green component ratio threshold value, wherein th_high, th_ Mid is the newer value of dynamic, and th_ext, R are fixed value, and th_high>th_mid.

It should be noted that preset night intensity of illumination expanded threshold value th_ext is less than night illumination under normal conditions Threshold value th_mid is limited in intensity, but is not excluded for some and there is th_mid in special circumstances<th_ext<Th_high or th_ext> th_high。

Be night state for the first scene state, the prior art using current intensity of illumination and intensity of illumination threshold value into Row compares, and the intensity of illumination threshold value of the prior art is a fixed value, i.e.,：If current intensity of illumination is more than intensity of illumination threshold Day mode is switched to when value.And the embodiment of the present invention is carried out using current intensity of illumination and three night intensity of illumination threshold values Compare, while the threshold value of current red component/green component ratio and preset red component/green component ratio being carried out Compare.It is to adapt to frequently replace that the first scene state of the embodiment of the present invention pair is improved for the decision condition of night state Scene state, in particular for some more extreme or special scenes, illustrated below with carrying out more accurate scene judgement Explanation.

Example 1 presets th_low=200, th_ext=800.

Video camera changes to indoor no light scene from intense light irradiation scene, and intensity of illumination is relatively low at this time, gets current Illumination is 100, because meeting the first decision condition, switches to night mode at this time, opening infrared light compensating lamp will be infrared Optical filter is set as infrared light responsive pattern.Because indoor environment is narrow, infrared external reflection light is too strong, and illumination is strong after opening infrared light compensating lamp Moment raising is spent, it is 2000 to get the illumination average values i_avg in preset time period at this time.

It is calculated according to i_avg：

Th_high=2000*1.25=2500

Th_mid=2000*0.75=1500

Later, user's carrying video camera enters outdoor, and current outdoor is at dusk or the cloudy day goes back though intensity of illumination is slightly lower Infrared light compensating lamp need not be opened, day mode is should be.But at this time because of outdoor environment spaciousness, infrared external reflection light is very weak, therefore The intensity of illumination that the sensor of video camera receives reduces instead, gets intensity of illumination and is reduced to 1000.If sentenced with the prior art It is fixed, for example the intensity of illumination threshold value of the prior art is 2000, then current intensity of illumination is less than intensity of illumination threshold value, according to existing Technology should keep night mode at this time.This is not inconsistent with the demand of actual use and judgement.But it can get, at this time because of outdoor optical It is mainly made of natural light, R-G Ratio have been lowered to R or less.Therefore according to embodiments of the present invention, meet the second judgement at this time Condition should be switched to day mode.Therefore the embodiment of the present invention is consistent with the demand of actual use and judgement, compared to existing There are technology, the accuracy higher of the pattern switching of the embodiment of the present invention.

Step 229, judge whether switching points are more than preset switching points threshold value, if so, thening follow the steps 230, really The scene state in this fixed period is state on daytime, and continues to execute step 231, and switching points are reset；If it is not, thening follow the steps 234, determine that the scene state in this period is night state.

After the embodiment of the present invention obtains judgement result using the second decision condition, this is not determined according to judgement result immediately The scene state in period simultaneously carries out pattern switching, but accumulates multiple periods, when switching points are more than switching points threshold value, It just determines the scene state in this period and carries out pattern switching.Accumulation of the embodiment of the present invention multiple periods carry out judging to avoid The pattern of video camera caused by frequent mode switching shakes problem.

Step 232, the scene state in this period determined according to step 230 is state on daytime, determines the pattern of video camera Switch to day mode.

Step 235, the scene state in this period determined according to step 234 is night state, determines the pattern of video camera Keep night mode.

Present invention method further includes, and after the pattern switching to day mode that step 232 determines video camera, closes Infrared light compensating lamp is closed, infrared fileter is switched to the infrared optical mode of cut-off；With, step 235 determine video camera pattern protect After holding night mode, infrared light compensating lamp is kept it turning on, holding infrared fileter is infrared light responsive pattern.

Below in conjunction with attached drawing, the pattern switching mistake of the video camera with infrared light compensating lamp of embodiment is illustrated the present invention Journey, at any time referring to red component/green component ratio in the mode handover procedure that Fig. 3 and Fig. 4, Fig. 3 are the embodiment of the present invention Change schematic diagram；Fig. 4 changes over time signal for intensity of illumination in the mode handover procedure of the embodiment of the present invention corresponding with Fig. 3 Figure.

In Fig. 3 and Fig. 4, short interval dotted line indicates different moments t0, t1, t2, t3, t4, Fig. 3 and Fig. 4 dotted line at short intervals Different moments are marked off, are for the ease of checking red component/green component ratio R/G Ratio and intensity of illumination Variations of the Illumination in different moments.In Fig. 3, rectangle dotted line indicates the threshold of red component/green component ratio Value R.In Fig. 4, long interval dotted line indicates that daylight intensity threshold th_low, single point-like line indicate night intensity of illumination upper limit threshold Value th_high, double dotted lines indicate that limit threshold value th_mid in night intensity of illumination, triangle dotted line indicate night intensity of illumination Expanded threshold value th_ext.

In conjunction with Fig. 3 and Fig. 4, the mode handover procedure of the video camera with infrared light compensating lamp of the embodiment of the present invention is specifically such as Under：

T0 moment, video camera are in day mode, and the infrared light compensating lamp of video camera is closed, at infrared fileter In the infrared optical mode of cut-off.

With time stepping method, Illumination is reduced, and at the t1 moment, when carrying out the scene state in this period and judging, is adopted With the first decision condition, detects and meet the first decision condition：Illumination<Th_low, after switching over points plus 1, It was found that switching points are more than switching points threshold value at this time, therefore it is switched to night mode, infrared light compensating lamp is opened, by infrared fileter Switch to infrared light responsive pattern.Illumination moments improve later.According to the i_avg of a period of time, update th_high and th_mid。

The t2 moment, using the second decision condition, detects Illumination when carrying out the scene state in this period and judging >=th_high and Illumination >=th_ext and R-G Ratio<R after switching over points plus 1, has found switching point at this time Number is more than switching points threshold value, therefore switches to day mode, closes infrared light compensating lamp, and switching infrared fileter is to ending infrared light Pattern.

The t3 moment, using the first decision condition, detects Illumination when carrying out the scene state in this period and judging <Th_low after switching over points plus 1, it is found that switching points are more than switching points threshold value at this time, therefore switch to night mode, Infrared light compensating lamp is opened, infrared fileter is switched into infrared light responsive pattern.According to the i_avg of a period of time, th_ is updated again High and th_mid.

The t4 moment, using the second decision condition, detects when carrying out the scene state in this period and judging

Illumination >=th_ext and Illumination≤th_mid and R-G Ratio<R switches over points After adding 1, it is found that switching points are more than switching points threshold value at this time, therefore switch to day mode.Infrared light compensating lamp is closed, switching is red Outer optical filter is to ending infrared optical mode.

As it can be seen that the mode switching method of the video camera provided in an embodiment of the present invention with infrared light compensating lamp, first period The first scene state that ground obtains the current intensity of illumination of video camera and a upper period determines.Then according to different first Scape state uses different decision conditions to obtain the judgement of scene state as a result, and completing video camera according to judgement result Pattern switching, i.e.,：If the first scene state is state on daytime, according to current intensity of illumination and preset daylight intensity Threshold value determines the scene state in this period, and according to the scene state in this period, is determined to switch to night mode or is kept for daytime Pattern；If the first scene state is night state, image when according to the current intensity of illumination of acquisition is calculated and is obtained currently Red component/green component ratio, according to current intensity of illumination, current red component/green component ratio, night illumination The threshold value of intensity threshold and preset red component/green component ratio, determines the scene state in this period, and according to this period Scene state, be determined to switch to day mode or keep night mode.The embodiment of the present invention is utilized to be opened in infrared light compensating lamp In the case of opening, red component caused by the environment infrared external reflection light/larger principle of green component ratio, in state and night on daytime Using the decision condition of different scene states when late state, in night state, not merely with current intensity of illumination and night Late intensity of illumination threshold value comparison also introduces red component/green component ratio and preset red component/green component ratio Threshold value comparison, compared with the prior art using only intensity of illumination and intensity of illumination threshold value comparison to determine scene state, the present invention The decision condition of embodiment is more fine, can obtain the judging result of the higher scene state of accuracy, so as to obtain The higher pattern switching result of accuracy.Meanwhile the embodiment of the present invention is after day mode is switched to night mode, by cutting The average value of the intensity of illumination in rear preset time period is changed, dynamic updates night intensity of illumination upper limit threshold and night intensity of illumination Middle limit threshold value will limit the scene state after threshold value is used in newer night intensity of illumination upper limit threshold and night intensity of illumination Judgement, can not only improve fitness of the video camera to the scene of different illumination intensity, can also further increase video camera The accuracy of pattern switching.

It is one kind of the mode-changeover device of the video camera with infrared light compensating lamp of the embodiment of the present invention referring to Fig. 5, Fig. 5 Structure chart.Including：

Acquisition module 501, first for obtaining the current intensity of illumination of video camera and the determination of a upper period periodically Scape state, the first scene state include state or night state on daytime.

First scene state determining module 502, if being state on daytime for the first scene state, according to current illumination Intensity and preset daylight intensity threshold, determine the scene state in this period.

First mode handover module 503 is determined to switch to night mode or holding for the scene state according to this period Day mode.

Night state computation module 504, if being night state for the first scene state, according to the current illumination of acquisition Image when intensity calculates and obtains current red component/green component ratio.

Second scene state determining module 505, for according to current intensity of illumination, current red component/green point The threshold value of amount ratio, night intensity of illumination threshold value and preset red component/green component ratio, determines the scene shape in this period State.

Second mode handover module 506 is determined to switch to day mode or holding for the scene state according to this period Night mode.

As it can be seen that the mode-changeover device of the video camera provided in an embodiment of the present invention with infrared light compensating lamp, first period The first scene state that ground obtains the current intensity of illumination of video camera and a upper period determines.Then according to different first Scape state uses different decision conditions to obtain the judgement of scene state as a result, and carrying out video camera according to judgement result Pattern switching, i.e.,：If the first scene state is state on daytime, according to current intensity of illumination and preset daylight intensity Threshold value determines the scene state in this period, and according to the scene state in this period, is determined to switch to night mode or is kept for daytime Pattern；If the first scene state is night state, image when according to the current intensity of illumination of acquisition is calculated and is obtained currently Red component/green component ratio, according to current intensity of illumination, current red component/green component ratio, night illumination The threshold value of intensity threshold and preset red component/green component ratio, determines the scene state in this period, and according to this period Scene state, be determined to switch to day mode or keep night mode.The embodiment of the present invention is utilized to be opened in infrared light compensating lamp In the case of opening, red component caused by the infrared external reflection light/larger principle of green component ratio, in state and night shape on daytime Using the decision condition of different scene states when state, in night state, not merely with current intensity of illumination and night light Compare according to intensity threshold, also introduces the threshold value of red component/green component ratio and preset red component/green component ratio Compare, compared with the prior art using only intensity of illumination and intensity of illumination threshold value comparison to determine that scene state, the present invention are implemented The decision condition of example is more fine, can obtain the judging result of the higher scene state of accuracy, accurate so as to obtain Spend higher pattern switching result.

It should be noted that the device of the embodiment of the present invention is the pattern using the above-mentioned video camera with infrared light compensating lamp The device of switching method, then all embodiments of the mode switching method of the above-mentioned video camera with infrared light compensating lamp be suitable for The device, and can reach same or analogous advantageous effect.

It is the video camera with infrared light compensating lamp of the embodiment of the present invention referring to Fig. 6, Fig. 6 as another embodiment Another structure chart of mode-changeover device.Including：

Acquisition module 601, including：

Gain and time for exposure acquisition submodule 6011, in a length of period, obtain when being used for corresponding with one frame image of shooting The current gain and current exposure time of imaging sensor amplifying circuit when shooting current frame image.

Pixel component computational submodule 6012, the average value of the red pixel component for calculating current frame image, green The average value of the average value and blue pixel component of pixel component.

Average brightness computational submodule 6013, for according to the average value of red pixel component, green pixel component it is flat The average value of mean value and blue pixel component calculates the average brightness for obtaining current frame image.

Intensity of illumination computational submodule 6014, for according to the average brightness of current frame image, current gain and current exposure Between light time, current intensity of illumination is obtained.

First scene state determining module 602, including：

First decision sub-module 6021, in the case where the first scene state is state on daytime, judging whether to meet First decision condition, and in the case where meeting the first decision condition, by switching points plus the first preset quantity；Do not meeting It, will the switching points preset quantity that subtracts the second in the case of one decision condition；First decision condition is：Current intensity of illumination is less than Preset daylight intensity threshold.

First scene state determination sub-module 6022, for judging whether switching points are more than preset switching points threshold Value if so, determining that the scene state in this period is night state, and switching points is reset；If not, it is determined that this period Scene state is state on daytime.

First mode handover module 603, including：

First mode keeps submodule 6031, for being state on daytime according to the scene state in this period, determines and keeps white Day mode.

First mode switching submodule 6032 is determined to switch to for being night state according to the scene state in this period Night mode.

Intensity of illumination mean value calculation module 604, for being state on daytime, first mode switching when the first scene state After this period is switched to night mode by module, the current intensity of illumination in third preset quantity period is obtained, and is calculated Obtain the average value of the current intensity of illumination in third preset quantity period.

Night intensity of illumination threshold calculation module 605, for strong by the current illumination in third preset quantity period Threshold coefficient is limited in the average value of degree, preset night intensity of illumination upper limit threshold coefficient and preset night intensity of illumination, weight New determine in night intensity of illumination upper limit threshold and night intensity of illumination limits threshold value, so that second in the period later judges item In part, using limiting threshold value in the night intensity of illumination upper limit threshold and night intensity of illumination redefined.

Wherein, night intensity of illumination threshold calculation module 605, is specifically used for：According to formula th_high=i_avg* α and Th_mid=i_avg* β are redefined in night intensity of illumination upper limit threshold and night intensity of illumination and are limited threshold value；Wherein, th_ High is night intensity of illumination upper limit threshold, and i_avg is the average value of the current intensity of illumination in third preset quantity period, α is preset night intensity of illumination upper limit threshold coefficient, and th_mid is that threshold value is limited in night intensity of illumination, and β is preset night Threshold coefficient is limited in intensity of illumination.

Night state computation module 606 is strong according to current illumination if being night state for the first scene state Degree calculates the ratio of the average value and the average value of green pixel component that obtain red pixel component.

Second scene state determining module 607, including：

Second decision sub-module 6071 meets the second decision condition for judging whether, and is meeting the second decision condition In the case of, by switching points plus the first preset quantity；In the case where not meeting the second decision condition, switching points are subtracted the Two preset quantities；Second decision condition is：Current intensity of illumination is greater than or equal to night intensity of illumination upper limit threshold, and is more than Or it is equal to night intensity of illumination expanded threshold value, and current red component/green component ratio is less than preset red component/green The threshold value of colouring component ratio；Or, current intensity of illumination is greater than or equal to night intensity of illumination expanded threshold value, and it is less than or equal to Threshold value is limited in night intensity of illumination, and current red component/green component ratio is less than preset red component/green component The threshold value of ratio.

Night intensity of illumination threshold value includes：Threshold value, preset is limited in night intensity of illumination upper limit threshold, night intensity of illumination Night intensity of illumination expanded threshold value；Wherein, night intensity of illumination upper limit threshold, which is more than in night intensity of illumination, limits threshold value.

Second scene state determination sub-module 6072, for judging whether switching points are more than preset switching points threshold Value if so, determining that the scene state in this period is state on daytime, and switching points is reset；If not, it is determined that this period Scene state is night state.

It is similar with first mode handover module in the embodiment of the present invention, second mode handover module 608, including：

Second mode switching submodule 6081 is determined to switch to for being state on daytime according to the scene state in this period Day mode.

Second mode keeps submodule 6082, for being night state according to the scene state in this period, determines and is kept for night Late pattern.

As it can be seen that the mode-changeover device of the video camera provided in an embodiment of the present invention with infrared light compensating lamp, first period The first scene state that ground obtains the current intensity of illumination of video camera and a upper period determines.Then according to different first Scape state uses different decision conditions to obtain the judgement of scene state as a result, and completing video camera according to judgement result Pattern switching, i.e.,：If the first scene state is state on daytime, according to current intensity of illumination and preset daylight intensity Threshold value determines the scene state in this period, and according to the scene state in this period, is determined to switch to night mode or is kept for daytime Pattern；If the first scene state is night state, image when according to the current intensity of illumination of acquisition is calculated and is obtained currently Red component/green component ratio, according to current intensity of illumination, current red component/green component ratio, night illumination The threshold value of intensity threshold and preset red component/green component ratio, determines the scene state in this period, and according to this period Scene state, be determined to switch to day mode or keep night mode.The embodiment of the present invention is utilized to be opened in infrared light compensating lamp In the case of opening, red component caused by the infrared external reflection light/larger principle of green component ratio, in state and night shape on daytime Using the decision condition of different scene states when state, in night state, not merely with current intensity of illumination and night light Compare according to intensity threshold, also introduces the threshold value of red component/green component ratio and preset red component/green component ratio Compare, compared with the prior art using only intensity of illumination and intensity of illumination threshold value comparison to determine that scene state, the present invention are implemented The decision condition of example is more fine, can obtain the judging result of the higher scene state of accuracy, accurate so as to obtain Spend higher pattern switching result.Meanwhile the embodiment of the present invention is after day mode is switched to night mode, after switching The average value of intensity of illumination in preset time period, dynamic updates to be limited in night intensity of illumination upper limit threshold and night intensity of illumination Threshold value sentences the scene state limited in newer night intensity of illumination upper limit threshold and night intensity of illumination after threshold value is used for It is fixed, fitness of the video camera to the scene of different illumination intensity can not only be improved, the mould of video camera can be also further increased The accuracy of formula switching.

It should be noted that herein, relational terms such as first and second and the like are used merely to a reality Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those Element, but also include other elements that are not explicitly listed, or further include for this process, method, article or equipment Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that There is also other identical elements in process, method, article or equipment including element.

Each embodiment in this specification is all made of relevant mode and describes, identical similar portion between each embodiment Point just to refer each other, and each embodiment focuses on the differences from other embodiments.Especially for system reality For applying example, since it is substantially similar to the method embodiment, so description is fairly simple, related place is referring to embodiment of the method Part explanation.

The above is merely preferred embodiments of the present invention, it is not intended to limit the scope of the present invention.It is all in this hair Any modification, equivalent replacement, improvement and so within bright spirit and principle, are included within the scope of protection of the present invention.

Claims

1. a kind of mode switching method of the video camera with infrared light compensating lamp, which is characterized in that the mode switching method packet It includes：

The first scene state of the current intensity of illumination of video camera and the determination of a upper period, first scene were obtained periodically State includes state or night state on daytime；

If first scene state is state on daytime, according to the current intensity of illumination and preset daylight intensity Threshold value determines the scene state in this period；

If first scene state is night state, according to image when obtaining the current intensity of illumination, calculating obtains Obtain red component/green component ratio currently；

According to the current intensity of illumination, the current red component/green component ratio, night intensity of illumination threshold value and The threshold value of preset red component/green component ratio, determines the scene state in this period；

2. according to the method described in claim 1, it is characterized in that, described obtain the current intensity of illumination of video camera periodically Step, including：

In a length of period when corresponding with one frame image of shooting, imaging sensor amplifying circuit works as when obtaining shooting current frame image Preceding gain and current exposure time；

Calculate the average value of red pixel component of current frame image, the average value of green pixel component and blue pixel component Average value；

According to the average value of the red pixel component, the average value of the green pixel component and the blue pixel component Average value calculates the average brightness for obtaining current frame image；

According to the average brightness of the current frame image, the current gain and the current exposure time, current light is obtained According to intensity；

The calculating obtains the step of current red component/green component ratio, is：It calculates and obtains the red pixel component The ratio of average value and the average value of the green pixel component.

If 3. according to the method described in claim 1, it is characterized in that, first scene state be daytime state, According to the current intensity of illumination and preset daylight intensity threshold, the step of determining the scene state in this period, packet It includes：

In the case where first scene state is state on daytime, judge whether to meet the first decision condition, and meeting In the case of stating the first decision condition, by switching points plus the first preset quantity；In the feelings for not meeting first decision condition It, will the switching points preset quantity that subtracts the second under condition；First decision condition is：Current intensity of illumination is less than preset daytime Intensity of illumination threshold value；

4. according to the method described in claim 3, it is characterized in that, the night intensity of illumination threshold value includes：Night illumination is strong Spend limit threshold value, preset night intensity of illumination expanded threshold value in upper limit threshold, night intensity of illumination；Wherein, the night illumination Upper intensity limit threshold value, which is more than in the night intensity of illumination, limits threshold value；

It is described according to the current intensity of illumination, the current red component/green component ratio, night intensity of illumination threshold The step of being worth the threshold value with preset red component/green component ratio, determining the scene state in this period, including：

Judge whether to meet the second decision condition, it, will switching points plus the and in the case where meeting second decision condition One preset quantity；It, will the switching points preset quantity that subtracts the second in the case where not meeting second decision condition；Described second Decision condition is：Current intensity of illumination is greater than or equal to night intensity of illumination upper limit threshold, and is greater than or equal to night illumination Intensity spread threshold value, and current red component/green component ratio is less than the threshold of preset red component/green component ratio Value；Or, current intensity of illumination is greater than or equal to night intensity of illumination expanded threshold value, and less than or equal in night intensity of illumination Threshold value is limited, and current red component/green component ratio is less than the threshold value of preset red component/green component ratio；

Judge whether switching points are more than preset switching points threshold value, if so, determining that the scene state in this period is daytime State, and switching points are reset；If not, it is determined that the scene state in this period is night state.

5. according to the method described in claim 3, it is characterized in that, the method further includes：

When the first scene state is state on daytime, this period switches to after night mode, obtains the third preset quantity period Current intensity of illumination, and calculate obtain the third preset quantity period current intensity of illumination average value；

Pass through the average value of the current intensity of illumination in the third preset quantity period, the preset night intensity of illumination upper limit Threshold coefficient is limited in threshold coefficient and preset night intensity of illumination, redefines night intensity of illumination upper limit threshold and night light According to limiting threshold value in intensity, so that in second decision condition in period later, using in the night intensity of illumination redefined Threshold value is limited in limit threshold value and night intensity of illumination.

6. according to the method described in claim 5, it is characterized in that, described current by the third preset quantity period The average value of intensity of illumination, limit threshold value in preset night intensity of illumination upper limit threshold coefficient and preset night intensity of illumination Coefficient redefines in night intensity of illumination upper limit threshold and night intensity of illumination and limits threshold value, including：

Night intensity of illumination upper limit threshold and night are redefined according to formula th_high=i_avg* α and th_mid=i_avg* β Threshold value is limited in late intensity of illumination；Wherein, the th_high is the night intensity of illumination upper limit threshold, and the i_avg is described The average value of the current intensity of illumination in third preset quantity period, the α are the preset night intensity of illumination upper limit Threshold coefficient, the th_mid are that threshold value is limited in the night intensity of illumination, and the β is in the preset night intensity of illumination Limit threshold coefficient.

7. a kind of mode-changeover device of the video camera with infrared light compensating lamp, which is characterized in that the mode-changeover device packet It includes：

Acquisition module, the first scene state for obtaining the current intensity of illumination of video camera and the determination of a upper period periodically, First scene state includes state or night state on daytime；

First scene state determining module, if being state on daytime for first scene state, according to the current light According to intensity and preset daylight intensity threshold, the scene state in this period is determined；

First mode handover module is determined to switch to night mode or keeps white for the scene state according to described period Day mode；

Night state computation module, if being night state for first scene state, according to the acquisition current light Image when according to intensity calculates and obtains current red component/green component ratio；

Second scene state determining module, for according to the current intensity of illumination, the current red component/green point The threshold value of amount ratio, night intensity of illumination threshold value and preset red component/green component ratio, determines the scene shape in this period State；

Second mode handover module is determined to switch to day mode or is kept for night for the scene state according to described period Late pattern.

8. device according to claim 7, which is characterized in that the acquisition module, including：

Gain and time for exposure acquisition submodule, in a length of period, it is current to obtain shooting when being used for corresponding with one frame image of shooting The current gain and current exposure time of imaging sensor amplifying circuit when frame image；

Pixel component computational submodule, average value, the green pixel component of the red pixel component for calculating current frame image Average value and blue pixel component average value；

Average brightness computational submodule, for according to the average value of the red pixel component, the green pixel component it is flat The average value of mean value and the blue pixel component calculates the average brightness for obtaining current frame image；

Intensity of illumination computational submodule, for according to the average brightness of the current frame image, the current gain and described working as The prior exposure time obtains current intensity of illumination；

The night state computation module, is specifically used for：Calculate the average value for obtaining the red pixel component and the green The ratio of the average value of pixel component.

9. device according to claim 7, which is characterized in that the first scene state determining module, including：

First decision sub-module, in the case where first scene state is state on daytime, judging whether satisfaction first Decision condition, and in the case where meeting first decision condition, by switching points plus the first preset quantity；Do not meeting institute It, will the switching points preset quantity that subtracts the second in the case of stating the first decision condition；First decision condition is：Current illumination Intensity is less than preset daylight intensity threshold；

First scene state determination sub-module, for judging whether switching points are more than preset switching points threshold value, if so, It determines that the scene state in this period is night state, and switching points is reset；If not, it is determined that the scene state in this period is Daytime state.

10. device according to claim 9, which is characterized in that the night intensity of illumination threshold value includes：Night illumination is strong Spend limit threshold value, preset night intensity of illumination expanded threshold value in upper limit threshold, night intensity of illumination；Wherein, the night illumination Upper intensity limit threshold value, which is more than in the night intensity of illumination, limits threshold value；

The second scene state determining module, including：

Second decision sub-module meets the second decision condition for judging whether, and in the feelings for meeting second decision condition Under condition, by switching points plus the first preset quantity；In the case where not meeting second decision condition, switching points are subtracted the Two preset quantities；Second decision condition is：Current intensity of illumination is greater than or equal to night intensity of illumination upper limit threshold, and More than or equal to night intensity of illumination expanded threshold value, and current red component/green component ratio is less than preset red point The threshold value of amount/green component ratio；Or, current intensity of illumination is greater than or equal to night intensity of illumination expanded threshold value, and it is less than Or equal to limiting threshold value in night intensity of illumination, and current red component/green component ratio is less than preset red component/green The threshold value of colouring component ratio；

Second scene state determination sub-module, for judging whether switching points are more than preset switching points threshold value, if so, It determines that the scene state in this period is state on daytime, and switching points is reset；If not, it is determined that the scene state in this period is Night state.

11. device according to claim 9, which is characterized in that the first mode handover module, including：

First mode keeps submodule, for being state on daytime according to the scene state in described period, determines and keeps mould on daytime Formula；

First mode switching submodule is determined to switch to night for being night state according to the scene state in described period Pattern；

Described device further includes：

Intensity of illumination mean value calculation module, for being state on daytime when the first scene state, the first mode switches submodule After this period is switched to night mode by block, the current intensity of illumination in third preset quantity period is obtained, and calculate and obtain Take the average value of the current intensity of illumination in third preset quantity period；

Night intensity of illumination threshold calculation module, for the current intensity of illumination by the third preset quantity period Threshold coefficient is limited in average value, preset night intensity of illumination upper limit threshold coefficient and preset night intensity of illumination, again really Determine to limit threshold value in night intensity of illumination upper limit threshold and night intensity of illumination, so that in second decision condition in period later In, using limiting threshold value in the night intensity of illumination upper limit threshold and night intensity of illumination redefined.

12. according to the devices described in claim 11, which is characterized in that the night intensity of illumination threshold calculation module, specifically For：