CN102231797A - Day and night image pick-up device, day and night switching method used for same - Google Patents
Day and night image pick-up device, day and night switching method used for same Download PDFInfo
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- CN102231797A CN102231797A CN201110169669XA CN201110169669A CN102231797A CN 102231797 A CN102231797 A CN 102231797A CN 201110169669X A CN201110169669X A CN 201110169669XA CN 201110169669 A CN201110169669 A CN 201110169669A CN 102231797 A CN102231797 A CN 102231797A
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Abstract
The invention discloses a day and night image pick-up device and a day and night switching method used for the same. The day and night image pick-up device comprises a light sensing circuit, a control circuit, a logic input/output circuit, a drive circuit and an optical filter switching circuit; the light sensing circuit is used for sensing external light and outputting a corresponding voltage signal; the control circuit identifies whether to execute day and night switching according to the voltage signal; the logic input/output circuit responds to a day and night switching command to control on/off operation of an infrared lamp that corresponds to the command; the drive circuit responds to the day and night switching command to drive the optical filter switching circuit to perform optical filter switching operation; and the optical filter switching circuit responds to the day and night switching command to execute the optical filter switching operation. The day and night image pick-up device provided by the invention can achieve the purpose of matching the use of infrared lamps of all manufacturers, so that the availability of the day and night image pick-up device can be improved.
Description
Technical field
The present invention relates to the field of camera supervised technology, relate in particular to and a kind ofly have the day and night camera head of two filters and be used for this day and night day and night changing method of camera head.
Background technology
Traditional two optical filtering chips day and night type video camera and external infrared lamp are used in the process, have a defective clearly, and promptly the colored black and white of changeing of video camera is closed commentaries on classics with infrared lamp and opened asynchronous.Such as, when extraneous light hangs down to some brightness values, first kind of mode is: this day and night the type video camera will change black and white by colour, and its filter commutation circuit is helped the spectrum optical glass sheet with the cutoff filter conversion, but this moment, infrared lamp with matching also can't in time be opened, and does not so just reach the effect that improves low-light (level); The second way is: infrared lamp has in time been opened, but day and night the color commentaries on classics of the not timely execution of type video camera is black for this, and still keep colored, in this process, the filter commutation circuit still remains cutoff filter, in this case, even infrared lamp has been opened, infrared light also can't obtain by sensor sensing by filter, so equally also can't improve the effect of low-light (level).By above-mentioned prior art as can be seen, the problem of its existence is: day and night the type video camera is when day and night switching, its corresponding infrared lamp and filter commutation circuit can't keep synchronously, thereby have weakened this day and night usability and accuracy of type video camera to a certain extent.
Summary of the invention
The purpose of the embodiment of the invention is to provide a kind of day and night camera head and a kind of day and night day and night changing method of camera head that is used for, described be used for the day and night changing method of camera head day and night can make this day and night camera head when day and night switching, keep its corresponding infrared lamp and filter commutation circuit synchronously.
In order to achieve the above object, the embodiment of the invention is by the following technical solutions:
A kind of day and night camera head comprises light sensing circuit, control circuit, logic imput output circuit, drive circuit and filter commutation circuit, wherein,
The light sensing circuit is in order to the perception extraneous light and export the correspondent voltage signal;
Control circuit judges whether to carry out day and night switching according to described voltage signal, if then send day and night switching command to described drive circuit and logic imput output circuit;
The logic imput output circuit responds described day and night switching command, the infrared lamp on/off operation that control is corresponding with it;
Drive circuit responds described day and night switching command, drives described filter commutation circuit and carries out the filter handover operation;
The filter commutation circuit responds described day and night switching command, carries out the filter handover operation.
Preferably, described control circuit comprises user's setup unit, in order to generate user-defined day and night switchover policy.
More preferably, described day and night camera head also comprises the memory that is connected to described control circuit, and it is in order to store described day and night switchover policy and to call for described control circuit.
A kind of day and night day and night changing method of camera head that is used for, described day and night camera head comprises control circuit, logic imput output circuit, drive circuit and filter commutation circuit, wherein, this method comprises:
The logic imput output circuit receives external control signal;
Control circuit sends day and night switching command according to the day and night switchover policy of described external control signal and pre-stored to described drive circuit;
The described day and night switching command of drive circuit response drives described filter commutation circuit and carries out the filter handover operation;
The filter commutation circuit is carried out the filter handover operation.
Preferably, carry out institute in steps before, also comprise:
Formulate day and night switchover policy according to user's setup unit that described control circuit comprises;
Described day and night switchover policy is stored to memory.
Preferably, described day and night switchover policy comprises high level available strategy or low level available strategy.
A kind of day and night day and night changing method of camera head that is used for, described day and night camera head comprises light sensing circuit, control circuit, logic imput output circuit, drive circuit and filter commutation circuit, wherein, this method comprises:
Light sensing circuit perception extraneous light is also exported the correspondent voltage signal;
Control circuit sends day and night switching command according to the day and night switchover policy of this voltage signal and pre-stored to described drive circuit and the output of logic imput output circuit;
The described day and night switching command of drive circuit response drives described filter commutation circuit and carries out the filter handover operation;
The described day and night switching command of logic imput output circuit response, the infrared lamp on/off operation that control is corresponding with it.
Preferably, carry out institute in steps before, also comprise:
Formulate day and night switchover policy according to user's setup unit that described control circuit comprises;
Described day and night switchover policy is stored to memory.
More preferably, described day and night switchover policy comprises and day and night switches class policy, and described control circuit day and night switches class policy according to this and the voltage signal of the light sensing circuit output that receives is exported day and night switching command.
More preferably, described day and night switchover policy also comprises day and night handoff delay strategy, described control circuit according to the voltage signal of the light sensing circuit output that receives, day and night switch class policy and this day and night the handoff delay strategy export day and night switching command.
Technical scheme by the invention described above embodiment is not difficult to find out, the day and night camera head that the embodiment of the invention provides and be used for day and night that the day and night changing method of camera head has following beneficial effect:
1, by this day and night user's setup unit of comprising of camera head carry out user-defined setting in advance, its infrared lamp that can cooperate all producers to provide is provided, thereby has improved this day and night availability of camera head.
2, carry out the day and night formulation of switchover policy by control circuit, thereby make the on/off operation of infrared lamp and the handover operation of filter commutation circuit can reach synchronously, thereby can improve this day and night usability and accuracy of type camera head to a certain extent.
Description of drawings
Fig. 1 is the illustrative view of functional configuration of the day and night camera head that provides of the embodiment of the invention;
Fig. 2 be first embodiment of the invention provide be used for the day and night day and night changing method flow chart of camera head;
Fig. 3 be second embodiment of the invention provide be used for the day and night day and night changing method flow chart of camera head.
The realization of the object of the invention, functional characteristics and excellent effect are described further below in conjunction with specific embodiment and accompanying drawing.
Embodiment
Below in conjunction with the drawings and specific embodiments technical scheme of the present invention is described in further detail, can be implemented so that those skilled in the art can better understand the present invention also, but illustrated embodiment is not as a limitation of the invention.
The invention provides a kind of day and night camera head, as shown in Figure 1, it comprises light sensing circuit 1, control circuit 2, logic imput output circuit 3, drive circuit 4 and filter commutation circuit 5, wherein,
Light sensing circuit 1 is in order to the perception extraneous light and export the correspondent voltage signal;
Logic imput output circuit 3 responds described day and night switching command, the infrared lamp on/off operation that control is corresponding with it;
In the practical application, above-mentioned light sensing circuit 1 can adopt general photosensitive circuit, and it is made up of phototriode and operational amplification circuit, and the voltage signal of exportable 0-3.3V is given the A/D mouth of control circuit 2 in the course of work.
In the practical application, above-mentioned control circuit 2 can be single-chip microcomputer, its voltage signal according to described photosensitive circuit output moves, I/O mouth control Driver Circuit 4 by 4 or other numbers, by serial ports and imaging signal processing circuit communication, in order to revising the partial parameters of imaging signal processing circuit, and control described logic imput output circuit 3 by 1 or several I/O mouths.
In the practical application, for described logic imput output circuit 3, its input circuit mainly is made up of optocoupler, and when external equipment (for example infrared lamp) when sending an external control signal, its input circuit can be sent to this external control signal control circuit 2; Its output circuit mainly is made up of a triode and relay, it is behind the day and night switching command that receives control circuit 2 transmissions, the action of finishing the closed of relay or disconnecting, thereby the connecting and disconnecting of control external equipment, wherein said external equipment is an infrared lamp.
In the practical application, above-mentioned drive circuit 4 can be made up of the triode of 2 groups of complementary symmetries, it is according to the control of control circuit 2, forward or backwards electric current is provided for dc coils in the described filter commutation circuit 5, carries out handover operation thereby control described filter commutation circuit 5.
In the practical application, 2 filters of assembling in the described filter commutation circuit 5 are respectively cutoff filter and full spectrum optical glass sheet, and it carries out the switching of filter under the driving action of described drive circuit 4.When described filter commutation circuit 5 switches to cutoff filter, forbid that infrared light passes through, it is applicable to the situation on daytime; When it switches to full spectrum optical glass sheet, allow the light of all spectrum to pass through, it is applicable to the situation in evening.
Preferably, described control circuit 2 comprises user's setup unit 21, in order to generate user-defined day and night switchover policy.More preferably, described day and night camera head also comprises the memory 11 that is connected to described control circuit 2, and it is in order to store described day and night switchover policy and to call for described control circuit 2.
By this user's setup unit 21, the user can be provided with day and night switches class policy and handoff delay strategy day and night.For the described class policy that day and night switches, after day and night camera head and external infrared lamp connect, by this user's setup unit 21, set it and day and night switch class policy, described day and night switch class policy be used for this day and night camera head judge whether to send day and night switching command after obtaining the voltage signal of light sensing circuit 1, in specific implementation process, the voltage signal of described light sensing circuit 1 output can be divided into several grades, can make control circuit 2 under different voltage signal intensity, export day and night switching command according to different grades.For example, the judgment threshold of setting N different brackets is set by described user's setup unit 21, and the size of the described N of User Defined different judgment threshold, when reality is used, the user selects one of them work, the voltage signal that the light sensing circuit 1 that described during this time control circuit 2 collects according to the judgment threshold and the control circuit 2 of this selection sends judges whether to export day and night switching command, if described voltage signal exceeds described judgment threshold, day and night switching command is exported in 2 outputs of described control circuit.Day and night switch class policy by this, the user can set this day and night day and night switching condition of camera head automatically according to different places, season and weather condition, for example carry out the time of day and night switching, for this reason, the embodiment of the invention provide this day and night the availability of camera head is higher.
For described day and night handoff delay strategy, when the user selected described a certain day and night switch class policy after, when the voltage signal that sends according to its corresponding judgment threshold and light sensing circuit 1 for control circuit 2 judges whether to export day and night switching command, in exporting the process of switching command day and night, adopt the method for time-delay to handle.More specifically, the user can be according to the delay time of these user's setup unit 21 settings, 1s for example, 5s, 10s, 20s etc., when delay time being set being 1s, described control circuit 2 is after knowing the voltage signal that light sensing circuit 1 sends, compare with the judgment threshold of described setting, if the size of described voltage signal exceeds or is lower than described judgment threshold, take the to delay time action of 1s of then described control circuit 2, if promptly the size of described voltage signal continues 1s and still exceeds or be lower than described judgment threshold, 2 actions of then described control circuit are exported day and night switching command to described drive circuit 4 and logic imput output circuit 3.Certainly, the process of setting described delay time by described user's setup unit 21 is user-defined, and the user can set this delay time according to different situations, thereby makes the application that it is more realistic.Adopt this user's setup unit 21 to set described day and night handoff delay strategy, can effectively avoid its day and night camera head when night work, be subjected to the influence (for example headlight for vehicles irradiation) of high light and take day and night handover operation (in fact in this case suddenly, day and night camera head need not to take this day and night handover operation), thereby make this day and night camera head be in improper operating state, make the not fogging clear of its shooting.
In addition, described day and night camera head also comprises camera lens 7, image sensing circuit 8, image information processing circuit 9 and video output circuit 10, described camera lens 7 sees through light signal, described image sensing circuit 8 adopts ccd sensor that light signal is converted to analog electrical signal, and be delivered to image information processing circuit and handle, described image information processing circuit 9 comprises the AGC process chip, the A/DC circuit, digital processing circuit and D/AC circuit etc., be used for delivering to the A/DC circuit after the analog electrical signal process AGC chip processing with ccd sensor output, analog electrical signal is converted to digital signal, and then carry out 3A (AWB through digital processing circuit, AE and AF) algorithm process and colour, the processing of luminance signal, become analog signal to export described video output circuit 10 to by the D/AC circuit conversion at last, described video output circuit 10 is exported this digital signal to watch-dogs such as monitors by it bnc interface that comprises.
The present invention also provides a kind of day and night day and night changing method of camera head that is used for, according to the first embodiment of the present invention, described day and night camera head comprises control circuit 2, logic imput output circuit 3, drive circuit 4 and filter commutation circuit 5, wherein, as shown in Figure 2, this method comprises:
S102, logic imput output circuit 3 receive external control signal;
The day and night switchover policy of S103, the control circuit 2 described external control signals of foundation and pre-stored sends day and night switching command to described drive circuit 4;
S104, the described day and night switching command of drive circuit 4 responses drive described filter commutation circuit 5 and carry out the filter handover operation;
S105, filter commutation circuit 5 are carried out the filter handover operation.
In the preferred implementation, carry out institute in steps before, also comprise:
User's setup unit 21 that S100, the described control circuit 2 of foundation comprise is formulated day and night switchover policy;
S101, described day and night switchover policy is stored to memory 11.
In above-mentioned steps, the external control signal that logic imput output circuit 3 receives can be sent by infrared lamp, for example, when the user controls described infrared lamp and opens by other means, it sends one high level/low level signal to described logic imput output circuit 3, described control circuit 2 is inquired about the day and night switchover policy of its pre-stored according to this high level/low level signal that receives, if coupling, then send day and night switching command and control described filter commutation circuit 5 and carry out the filter handover operation to described drive circuit 4.Wherein, described day and night switchover policy comprises high level available strategy or low level available strategy, when the day and night switchover policy of even described setting is the high level available strategy, when having only the level signal that sends to described control circuit 2 when described infrared lamp to be high level, described control circuit 2 just can be made response and send day and night switching command to described drive circuit 4.In like manner, when being the low level available strategy for described day and night switchover policy, when having only the level signal that sends to described control circuit 2 when described infrared lamp to be low level, described control circuit 2 just can be made response and send day and night switching command to described drive circuit 4.
According to the second embodiment of the present invention, the described day and night day and night changing method of camera head that is used for, its day and night camera head comprise light sensing circuit 1, control circuit 2, logic imput output circuit 3, drive circuit 4 and filter commutation circuit 5, wherein, as shown in Figure 3, this method comprises:
S202, light sensing circuit 1 perception extraneous light are also exported the correspondent voltage signal;
S203, control circuit 2 send day and night switching command according to the day and night switchover policy of this voltage signal and pre-stored to described drive circuit 4 and 3 outputs of logic imput output circuit;
S204, the described day and night switching command of drive circuit 4 responses drive described filter commutation circuit 5 and carry out the filter handover operation;
S205, the described day and night switching command of logic imput output circuit 3 responses, the infrared lamp on/off operation that control is corresponding with it.
Preferably, carry out institute in steps before, also comprise:
User's setup unit 21 that S200, the described control circuit 2 of foundation comprise is formulated day and night switchover policy;
S201, described day and night switchover policy is stored to memory 11.
More preferably, described day and night switchover policy comprises and day and night switches class policy, and described control circuit 2 day and night switches class policy according to this and the voltage signal of light sensing circuit 1 output that receives is exported day and night switching command.
For the described class policy that day and night switches, its be used for this day and night camera head judge whether to send day and night switching command after obtaining the voltage signal of light sensing circuit 1, in specific implementation process, the voltage signal of described light sensing circuit 1 output can be divided into several grades, can make control circuit 2 under different voltage signal intensity, export day and night switching command according to different grades.
For example, the user is provided with the judgment threshold of setting N different brackets by described user's setup unit 21, and the size of the described N of User Defined different judgment threshold, when reality is used, the user selects one of them judgment threshold to make this day and night camera head work, the voltage signal that the light sensing circuit 1 that described during this time control circuit 2 collects according to the judgment threshold and the control circuit 2 of this selection sends judges whether to export day and night switching command, if described voltage signal exceeds described judgment threshold, day and night switching command is exported in 2 outputs of described control circuit.Day and night switch class policy by this, the user can set this day and night day and night switching condition of camera head automatically according to different places, season and weather condition, for example carry out the time of day and night switching, for this reason, the embodiment of the invention provide this day and night the availability of camera head is higher.
More preferably, described day and night switchover policy also comprises day and night handoff delay strategy, described control circuit 2 according to the voltage signal of light sensing circuit 1 output that receives, day and night switch class policy and this day and night the handoff delay strategy export day and night switching command.
For described day and night handoff delay strategy, when the user selected described day and night switch class policy after, for control circuit 2 when day and night switching voltage signal that pairing judgment threshold of class policy and light sensing circuit 1 send and judge whether to export day and night switching command, in exporting the process of switching command day and night, adopt the method for time-delay to handle.More specifically, the user can be according to the delay time of these user's setup unit 21 settings, 1s for example, 5s, 10s, 20s etc., when delay time being set being 1s, described control circuit 2 is after knowing the voltage signal that light sensing circuit 1 sends, compare with the judgment threshold of described setting, if the size of described voltage signal exceeds or is lower than described judgment threshold, take the to delay time action of 1s of then described control circuit 2, if promptly the size of described voltage signal continues 1s and still exceeds or be lower than described judgment threshold, 2 actions of then described control circuit are exported day and night switching command to described drive circuit 4 and logic imput output circuit 3.Certainly, the process of setting described delay time by described user's setup unit 21 is user-defined, and the user can set this delay time according to different situations, thereby makes the application that it is more realistic.Adopt this user's setup unit 21 to set described day and night handoff delay strategy, can effectively avoid its day and night camera head when night work, be subjected to the influence (for example headlight for vehicles irradiation) of high light and take day and night handover operation suddenly, because under the practical situation, day and night camera head need not to take this day and night handover operation at all, thereby this misoperation make this day and night camera head be in improper operating state, make the not fogging clear of its shooting.
The above only is the preferred embodiments of the present invention; be not so limit claim of the present invention; every equivalent structure or equivalent flow process conversion that utilizes specification of the present invention 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 invention.
Claims (10)
1. a camera head day and night is characterized in that, comprises light sensing circuit, control circuit, logic imput output circuit, drive circuit and filter commutation circuit, wherein,
The light sensing circuit is in order to the perception extraneous light and export the correspondent voltage signal;
Control circuit judges whether to carry out day and night switching according to described voltage signal, if then send day and night switching command to described drive circuit and logic imput output circuit;
The logic imput output circuit responds described day and night switching command, the infrared lamp on/off operation that control is corresponding with it;
Drive circuit responds described day and night switching command, drives described filter commutation circuit and carries out the filter handover operation;
The filter commutation circuit responds described day and night switching command, carries out the filter handover operation.
2. day and night camera head as claimed in claim 1 is characterized in that described control circuit comprises user's setup unit, in order to generate user-defined day and night switchover policy.
3. day and night camera head as claimed in claim 2 is characterized in that, also comprises the memory that is connected to described control circuit, and it is in order to store described day and night switchover policy and to call for described control circuit.
4. one kind is used for the day and night day and night changing method of camera head, it is characterized in that described day and night camera head comprises control circuit, logic imput output circuit, drive circuit and filter commutation circuit, and wherein, this method comprises:
The logic imput output circuit receives external control signal;
Control circuit sends day and night switching command according to the day and night switchover policy of described external control signal and pre-stored to described drive circuit;
The described day and night switching command of drive circuit response drives described filter commutation circuit and carries out the filter handover operation;
The filter commutation circuit is carried out the filter handover operation.
5. the day and night day and night changing method of camera head that is used for as claimed in claim 4 is characterized in that, carry out institute in steps before, also comprise:
Formulate day and night switchover policy according to user's setup unit that described control circuit comprises;
Described day and night switchover policy is stored to memory.
6. the day and night day and night changing method of camera head that is used for as claimed in claim 5 is characterized in that described day and night switchover policy comprises high level available strategy or low level available strategy.
7. one kind is used for the day and night day and night changing method of camera head, it is characterized in that described day and night camera head comprises light sensing circuit, control circuit, logic imput output circuit, drive circuit and filter commutation circuit, and wherein, this method comprises:
Light sensing circuit perception extraneous light is also exported the correspondent voltage signal;
Control circuit sends day and night switching command according to the day and night switchover policy of this voltage signal and pre-stored to described drive circuit and the output of logic imput output circuit;
The described day and night switching command of drive circuit response drives described filter commutation circuit and carries out the filter handover operation;
The described day and night switching command of logic imput output circuit response, the infrared lamp on/off operation that control is corresponding with it.
8. the day and night day and night changing method of camera head that is used for as claimed in claim 7 is characterized in that, carry out institute in steps before, also comprise:
Formulate day and night switchover policy according to user's setup unit that described control circuit comprises;
Described day and night switchover policy is stored to memory.
9. the day and night day and night changing method of camera head that is used for as claimed in claim 8, it is characterized in that, described day and night switchover policy comprises and day and night switches class policy, and described control circuit day and night switches class policy according to this and the voltage signal of the light sensing circuit output that receives is exported day and night switching command.
10. the day and night day and night changing method of camera head that is used for as claimed in claim 9, it is characterized in that, described day and night switchover policy also comprises day and night handoff delay strategy, described control circuit according to the voltage signal of the light sensing circuit output that receives, day and night switch class policy and this day and night the handoff delay strategy export day and night switching command.
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Application publication date: 20111102 |