CN104104884A - Camera and method of adjusting brightness of video signal - Google Patents
Camera and method of adjusting brightness of video signal Download PDFInfo
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- CN104104884A CN104104884A CN201310128635.5A CN201310128635A CN104104884A CN 104104884 A CN104104884 A CN 104104884A CN 201310128635 A CN201310128635 A CN 201310128635A CN 104104884 A CN104104884 A CN 104104884A
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Abstract
The present invention discloses a camera and a method of adjusting the brightness of a video signal. The camera comprises an image collector for collecting an original video signal; a processor used for receiving the original video signal from the image collector to carry out strong light reversion processing and sending a feedback signal according to the processed brightness of the video signal, or used for obtaining the original video signal processed by a strong light reversion control circuit, and sending the feedback signal according to the processed brightness of the video signal, wherein the feedback signal is used to adjust the brightness of the original video signal, and the strong light reversion control circuit carries out the strong light reversion processing on the original video signal received by the image collector and outputs the signal to the processor; and an output interface used for outputting the video signal of which the brightness is adjusted to a display device. According to the present invention, the production cost of hardware is reduced, and the content of the images obtained by a monitoring device is clear and visible.
Description
Technical field
The present invention relates to camera supervised field, in particular to a kind of method of adjustment of adjusting video camera and the video luminance signal of video luminance signal.
Background technology
At present, the traffic monitoring technology based on computer vision and image processing has the advantages that cost is low, extensibility is strong, and compares with traditional buried induction coil technology, and more horn of plenty and profound transport information can be provided.In correlation technique, for the traffic monitoring under condition in the daytime, all done a large amount of research work both at home and abroad, and obtained some important achievements in research.Yet as a part for all-weather traffic monitoring, i.e. vehicle monitoring under night condition is made slow progress for a long time because of its complicated illumination condition.Some developed countries attempt to adopt installation infrared video camera to obtain road image at night, the method is very effective when detection pedestrian at night, but when detecting the vehicle of night running, still can be subject to the impact of high light, ground return light and the ambient light of headlight or tail-light, and thermal camera is expensive.Therefore, comparatively general method remains and adopts common charge coupled cell (CCD) video camera to take nighttime image at present, by the headlight in detected image, detects vehicle.But the defect that the method exists is, because the high light of the headlight in detected image or tail-light can make whole picture excessively bright, cannot the monitored vehicle of clear identification., in correlation technique, conventionally can adopt after getting detected image for this reason, detected image is carried out to equalization processing.Although this kind of processing mode can reduce the overall brightness of detected image, the part that is originally low bright signal in picture is after carrying out equalization processing, and its brightness further reduces, and cannot see clearly.
Summary of the invention
The invention provides a kind of method of adjustment of adjusting video camera and the video luminance signal of video luminance signal, at least to solve in correlation technique, the processing mode of the vision signal getting by watch-dog is easily caused to the whole ambiguous problem of detected image.
According to an aspect of the present invention, provide a kind of video camera of adjusting video luminance signal.
According to the video camera of adjustment video luminance signal of the present invention, comprise: image acquisition device, gathers raw video signal; Processor, receives raw video signal from image acquisition device and carries out high light reverse processing, and send feedback signal according to the brightness of the vision signal after processing; Or, processor, obtain through high light and reverse the raw video signal that control circuit is processed, and send feedback signal according to the brightness of the vision signal after processing, wherein, feedback signal is for the brightness of raw video signal is adjusted, and high light reverses control circuit, the raw video signal receiving from image acquisition device carries out high light and reverses processing, and exports processor to; Output interface, for exporting the vision signal through brightness adjustment to display unit.
Preferably, above-mentioned image acquisition device is automatic gain controller; Processor, receives raw video signal from automatic gain controller and carries out high light reverse processing, and send feedback signal according to the brightness of the vision signal after processing, and indication automatic gain controller is adjusted the brightness of raw video signal; Or processor, obtains through high light and reverse the raw video signal of processing, and send feedback signal according to the brightness of the vision signal after processing, indication automatic gain controller is adjusted the brightness of raw video signal.
Preferably, feedback signal is automatic gaining controling signal; Automatic gain controller, according to automatic gaining controling signal, promote the brightness of raw video signal, wherein, processor is determined the brightness multiplication factor to raw video signal according to the vision signal after processing, and sends automatic gaining controling signal to automatic gain controller.
Preferably, high light reverses control circuit, the raw video signal receiving is carried out to high light and reverse processing, and export processor to from automatic gain controller.
Preferably, high light reverses control circuit and comprises: the first comparator, be connected with automatic gain controller, receive the raw video signal from automatic gain controller, and in definite raw video signal, whether exist the voltage of some or all of signal higher than the first predetermined threshold value; OR circuit, is connected with the first comparator, and the voltage that has some or all of signal in the comparative result of the first comparator output is during higher than the first predetermined threshold value, output low level switching signal, otherwise, output high level switching signal; Analog switch, be connected with OR circuit, when receiving low level switching signal, the voltage of the some or all of signal higher than the first predetermined threshold value is replaced to default high light and reverse reference voltage, and export the vision signal after replacing to processor, or, when receiving high level switching signal, directly export raw video signal to processor.
Preferably, high light reverses control circuit and also comprises: the second comparator, its input is connected with digital signal processor, its output is connected with OR circuit, receive the automatic gaining controling signal of self processor, and judge according to automatic gaining controling signal whether the brightness of raw video signal is less than the second predetermined threshold value; If be less than, exported high level signal and suppress raw video signal to carry out high light reverse processing.
A kind of method of adjustment of camera video signal brightness is provided according to a further aspect in the invention.
According to the method for adjustment of camera video signal brightness of the present invention, comprise: processor carries out high light to the raw video signal receiving from image acquisition device and reverses processing, and wherein, image acquisition device gathers raw video signal; Processor sends feedback signal according to the brightness of the vision signal after processing, and wherein, feedback signal is for adjusting the brightness of raw video signal and processor exports the vision signal through brightness adjustment to display via output interface.
Preferably, processor comprises according to the brightness transmission feedback signal of the vision signal after processing: processor obtains the brightness of the vision signal after processing; Processor sends feedback signal according to the brightness of the vision signal after processing, and wherein, feedback signal is used to indicate automatic gain controller the brightness of raw video signal is adjusted.
The method of adjustment of another kind of camera video signal brightness is provided according to another aspect of the invention.
According to the method for adjustment of camera video signal brightness of the present invention, comprise: processor obtains through high light and reverses the raw video signal that control circuit is processed, wherein, high light reverses control circuit the raw video signal receiving from image acquisition device is carried out to high light reverse processing, and exports the vision signal after processing to processor; Processor sends feedback signal according to the brightness of the vision signal after processing, and wherein, feedback signal is for adjusting the brightness of raw video signal and processor exports the vision signal through brightness adjustment to display unit via output interface.
Preferably, processor comprises according to the brightness transmission feedback signal of the vision signal after processing: processor obtains the brightness of the vision signal after processing; Processor sends feedback signal according to the brightness of the vision signal after processing, and wherein, feedback signal is used to indicate automatic gain controller the brightness of raw video signal is adjusted.
Preferably, feedback signal is automatic gaining controling signal; After processor sends feedback signal according to the brightness of the vision signal after processing, can also comprise: automatic gain controller receives the automatic gaining controling signal that comes from processor, wherein, processor is determined the brightness multiplication factor to raw video signal according to the vision signal after processing, and sends automatic gaining controling signal to automatic gain controller; Automatic gain controller promotes the brightness of raw video signal according to automatic gaining controling signal.
Preferably, high light reverses control circuit the raw video signal receiving from image acquisition device is carried out to high light reverse processing, and export the vision signal after processing to processor and comprise: whether high light reverses control circuit and receives and come from the raw video signal of automatic gain controller, and in definite raw video signal, exist the voltage of some or all of signal higher than the first predetermined threshold value; When high light reverses voltage that control circuit exists some or all of signal in raw video signal higher than the first predetermined threshold value, output low level switching signal, otherwise, output high level switching signal; High light reverses control circuit when receiving low level switching signal, the voltage of the some or all of signal higher than the first predetermined threshold value is replaced to default high light and reverse reference voltage, and export the vision signal after replacing to processor, or, when receiving high level switching signal, directly export raw video signal to processor.
Preferably, high light reverses control circuit to carry out high light to the raw video signal receiving from automatic gain controller and reverses and processes and export to processor and also comprise: high light reverses control circuit reception and comes from the automatic gaining controling signal of processor, and judges according to automatic gaining controling signal whether the brightness of raw video signal is less than the second predetermined threshold value; If be less than, suppressed high light reverse control circuit raw video signal is carried out to high light reverse processing.
By the present invention, adopt processor to carry out high light to the raw video signal receiving and reverse processing, and send feedback signal according to the brightness of the vision signal after processing; Or, processor obtains through high light and reverses the raw video signal of processing, and send feedback signal according to the brightness of the vision signal after processing, feedback signal is for adjusting the brightness of raw video signal, solved in correlation technique the processing mode of the vision signal getting by watch-dog has easily been caused to the whole ambiguous problem of detected image, not only reduce the production cost of hardware, but also can make the picture material obtained by watch-dog high-visible.
Accompanying drawing explanation
Accompanying drawing described herein is used to provide a further understanding of the present invention, forms the application's a part, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is according to the structured flowchart of the video camera of the adjustment video luminance signal of the embodiment of the present invention;
Fig. 2 is the structured flowchart of adjusting according to the preferred embodiment of the invention the video camera of video luminance signal;
Fig. 3 is according to the flow chart of the method for adjustment of the camera video signal brightness of the embodiment of the present invention;
Fig. 4 is according to the flow chart of the method for adjustment of the another kind of camera video signal brightness of the embodiment of the present invention;
Fig. 5 is that high light reverses the flow chart of implementation control method according to the preferred embodiment of the invention;
Fig. 6 is according to the structured flowchart of the adjustment System of the camera video signal brightness of the embodiment of the present invention;
Fig. 7 is the structured flowchart of the adjustment System of camera video signal brightness according to the preferred embodiment of the invention;
Fig. 8 is according to the structured flowchart of the adjustment System of the another kind of camera video signal brightness of the embodiment of the present invention;
Fig. 9 is the structured flowchart of the adjustment System of another kind of according to the preferred embodiment of the invention camera video signal brightness.
Embodiment
Hereinafter with reference to accompanying drawing, also describe the present invention in detail in conjunction with the embodiments.It should be noted that, in the situation that not conflicting, embodiment and the feature in embodiment in the application can combine mutually.
Fig. 1 is according to the structured flowchart of the video camera of the adjustment video luminance signal of the embodiment of the present invention.As shown in Figure 1, the video camera of this adjustment video luminance signal can comprise: image acquisition device 10, gathers raw video signal; Processor 20, receives raw video signal from image acquisition device and carries out high light reverse processing, and send feedback signal according to the brightness of the vision signal after processing; Or, processor, obtain through high light and reverse the raw video signal that control circuit is processed, and send feedback signal according to the brightness of the vision signal after processing, wherein, feedback signal is for the brightness of raw video signal is adjusted, and high light reverses control circuit, the raw video signal receiving from image acquisition device carries out high light and reverses processing, and exports processor to; Output interface 30, for exporting the vision signal through brightness adjustment to display unit.
In correlation technique, to the processing mode of the vision signal getting by watch-dog, easily cause detected image integral body smudgy.Adopt device as shown in Figure 1, processor carries out high light to the raw video signal receiving and reverses processing, and sends feedback signal according to the brightness of the vision signal after processing; Or, processor obtains through high light and reverses the raw video signal of processing, and send feedback signal according to the brightness of the vision signal after processing, feedback signal is for adjusting the brightness of raw video signal, the highlighted signal getting is carried out to high light and reverse processing, thereby reduce the highlight brightness in detected image; And the low bright signal getting is carried out to brightness adjustment according to feedback signal, thereby the low light level brightness in lifting detected image, solved thus in correlation technique the processing mode of the vision signal getting by watch-dog has easily been caused to the whole ambiguous problem of detected image, not only reduce the production cost of hardware, but also can make the picture material obtained by watch-dog high-visible.
Preferably, as shown in Figure 2, above-mentioned image acquisition device can be automatic gain controller 10; Processor 20, receives raw video signal from automatic gain controller and carries out high light reverse processing, and send feedback signal according to the brightness of the vision signal after processing, and indication automatic gain controller is adjusted the brightness of raw video signal; Or processor, obtains through high light and reverse the raw video signal of processing, and send feedback signal according to the brightness of the vision signal after processing, indication automatic gain controller is adjusted the brightness of raw video signal.
In a preferred embodiment, above-mentioned processor can include but not limited to: digital signal processor (DSP), DSP can directly receive the raw video signal that comes from automatic gain controller (AFE), and in inside, carry out high light and reverse processing, highlighted signal in raw video signal is carried out to brightness reduction, can send feedback signal according to result, indication AFE regulates the brightness of raw video signal, promotes the brightness of low bright signal simultaneously.
Preferably, as shown in Figure 2, above-mentioned feedback signal can be automatic gaining controling signal; Automatic gain controller 10, according to automatic gaining controling signal, promote the brightness of raw video signal, wherein, processor is determined the brightness multiplication factor to raw video signal according to the vision signal after processing, and sends automatic gaining controling signal to automatic gain controller.
In a preferred embodiment, AFE can determine the low bright signal section in raw video signal according to the automatic gaining controling signal of DSP feedback, can also determine the brightness multiplication factor to low bright signal according to automatic gaining controling signal simultaneously, thereby promote the brightness of low bright signal.
Preferably, as shown in Figure 2, high light reverses control circuit 40, the raw video signal receiving is carried out to high light and reverse processing, and export processor to from automatic gain controller.
In a preferred embodiment, camera video signal in correlation technique normally directly exports DSP to carry out signal processing by AFE, and technical scheme provided by the present invention has increased the circuit such as comparator, gate level circuit, selector switch between AFE and DSP, to realize high light reversing function.
Preferably, as shown in Figure 2, high light reverses control circuit 40 and can comprise: the first comparator 400, be connected with automatic gain controller, reception is from the raw video signal of automatic gain controller, and in definite raw video signal, whether exist the voltage of some or all of signal higher than the first predetermined threshold value (be Threshold1, high light reverses controls threshold value); OR circuit 402, is connected with the first comparator, and the voltage that has some or all of signal in the comparative result of the first comparator output is during higher than the first predetermined threshold value, output low level switching signal, otherwise, output high level switching signal; Analog switch 404, be connected with OR circuit, when receiving low level switching signal, the voltage of the some or all of signal higher than the first predetermined threshold value is replaced to default high light and reverse reference voltage, and export the vision signal after replacing to processor, or, when receiving high level switching signal, directly export raw video signal to processor.
In a preferred embodiment, the first comparator (Comparator1) compares raw video signal and the Threshold1 of AFE output, and exports a switching signal, wherein, in raw video signal, the voltage of various piece is all lower than Threshold1, and the switching signal of output is high level; If have the voltage of some or all of signal in raw video signal higher than Threshold1, the switching signal of output is low level.When high light reversing function is opened, while being high light reverse control switch (ECLIP) and the equal output low level signal of the second comparator (Comparator2), OR circuit (POSITIVE OR GATE) is according to the output signal of Comparator1, Comparator2 and ECLIP control simulation switch (Analog Switch), and Analog Switch exports and selects high light to reverse reference voltage (VREF) signal when switch (SWITCH) signal is low level; When SWITCH signal is high level, video (VIDEO) signal is selected in output.
Thus, in raw video signal, voltage is just replaced by vref signal higher than the part of Threshold1, as long as vref signal is set to compared with low level, the mistake bright area in raw video signal will be reversed into as compared with dark areas, thereby has realized high light reversing function.Because the realization of this function occurs in to before DSP incoming video signal, the raw video signal of AFE output is originally brighter thus, and the vision signal that exports DSP to reverses processing owing to having passed through high light, make the vision signal that exports DSP to be reversed dimmed, therefore, DSP just can send automatic gaining controling signal and feed back to AFE, indication AFE increases the brightness multiplication factor of the vision signal export DSP to, thereby originally compared with the brightness of dark areas, is promoted exporting in the vision signal of DSP.
Preferably, as shown in Figure 2, high light reverses control circuit 40 and can also comprise: the second comparator 406, its input is connected with digital signal processor, its output is connected with OR circuit, receives the automatic gaining controling signal of self processor, and judges that according to automatic gaining controling signal whether the brightness of raw video signal is less than the second predetermined threshold value (is Threshold2, in the situation that brightness is darker, high light reverses control switch threshold value); If be less than, exported high level signal and suppress raw video signal to carry out high light reverse processing.
In a preferred embodiment, above-mentioned high light reverses another special feature of control circuit and is to have increased newly Comparator2, and when extraneous light is brighter, Comparator2 output is always low level signal, thereby can not affect the realization of high light reversing function.But, if extraneous light bright not (for example: there is no cart car light night), Comparator2 will export high level signal, even if high light reversing function is opened like this, also cannot play a role, with this, prevent after this function is opened, if cause reversing phenomenon while having night faint light sources such as battery vehicle, flashlight, alarm lamp to occur by mistake, occur, so that this function possesses specific aim more.
Fig. 3 is according to the flow chart of the method for adjustment of the camera video signal brightness of the embodiment of the present invention.As shown in Figure 3, the method can comprise following treatment step:
Step S302: processor carries out high light to the raw video signal receiving from image acquisition device and reverses processing, and wherein, image acquisition device gathers raw video signal;
Step S304: processor sends feedback signal according to the brightness of the vision signal after processing, wherein, feedback signal is used to indicate that automatic gain controller is adjusted the brightness of raw video signal and processor exports the vision signal through brightness adjustment to display unit via output interface.
Adopt method as shown in Figure 3, solved in correlation technique the processing mode of the vision signal getting by watch-dog has easily been caused to the whole ambiguous problem of detected image, not only reduce the production cost of hardware, but also can make the picture material obtained by watch-dog high-visible.
In preferred implementation process, in step S304, processor sends feedback signal according to the brightness of the vision signal after processing can comprise following operation:
Step S1: processor obtains the brightness of the vision signal after processing;
Step S2: processor sends feedback signal according to the brightness of the vision signal after processing, and wherein, feedback signal is used to indicate automatic gain controller the brightness of raw video signal is adjusted.
Fig. 4 is according to the flow chart of the method for adjustment of the another kind of camera video signal brightness of the embodiment of the present invention.As shown in Figure 4, the method can comprise following treatment step:
Step S402: processor obtains through high light and reverses the raw video signal that control circuit is processed, wherein, high light reverses control circuit the raw video signal receiving from image acquisition device is carried out to high light reverse processing, and exports the vision signal after processing to processor;
Step S404: processor sends feedback signal according to the brightness of the vision signal after processing, wherein, feedback signal is for adjusting the brightness of raw video signal and processor will export display unit to through the vision signal of brightness adjustment via output interface.
Adopt method as shown in Figure 4, solved in correlation technique the processing mode of the vision signal getting by watch-dog has easily been caused to the whole ambiguous problem of detected image, not only reduce the production cost of hardware, but also can make the picture material obtained by watch-dog high-visible.
Preferably, in step S404, processor sends feedback signal according to the brightness of the vision signal after processing can comprise following operation:
Step S3: processor obtains the brightness of the vision signal after processing;
Step S4: processor sends feedback signal according to the brightness of the vision signal after processing, and wherein, feedback signal is used to indicate automatic gain controller the brightness of raw video signal is adjusted.
Preferably, above-mentioned feedback signal can be automatic gaining controling signal; At step S404, processor can also comprise the following steps after sending feedback signal according to the brightness of the vision signal after processing:
Step S5: automatic gain controller receives the automatic gaining controling signal that comes from processor, wherein, processor is determined the brightness multiplication factor to raw video signal according to the vision signal after processing, and sends automatic gaining controling signal to automatic gain controller;
Step S6: automatic gain controller promotes the brightness of raw video signal according to automatic gaining controling signal.
Preferably, at step S402, processor can also comprise following processing before obtaining and reversing through high light the raw video signal of processing:
Step S7: high light reverse control circuit carries out high light reverse to the raw video signal receiving from automatic gain controller and processes and export to processor.
In a preferred embodiment, technical scheme provided by the present invention is by adopting physical circuit to export DSP to after raw video signal is completed to reverse again, DSP is detecting through reversing after the vision signal of processing, will regulate film speed or aperture size, and then promote the brightness of low bright area.
Preferably, in step S7, high light reverses control circuit to carry out high light to the raw video signal receiving from automatic gain controller and reverses and process and export to processor and can comprise following operation:
Step S71: whether high light reverses control circuit reception and comes from the raw video signal of automatic gain controller, and exist the voltage of some or all of signal higher than the first predetermined threshold value in definite raw video signal;
Step S72: when high light reverses voltage that control circuit exists some or all of signal in raw video signal higher than the first predetermined threshold value, output low level switching signal, otherwise, output high level switching signal;
Step S73: high light reverses control circuit when receiving low level switching signal, the voltage of the some or all of signal higher than the first predetermined threshold value is replaced to default high light and reverse reference voltage, and export the vision signal after replacing to processor, or, when receiving high level switching signal, directly export raw video signal to processor.
In preferred implementation process, said method can also comprise the following steps:
Step S74: high light reverses control circuit reception and comes from the automatic gaining controling signal of processor, and judges according to automatic gaining controling signal whether the brightness of raw video signal is less than the second predetermined threshold value; If be less than, suppressed high light reverse control circuit raw video signal is carried out to high light reverse processing.
Below in conjunction with the preferred implementation shown in Fig. 5, above-mentioned preferred implementation process is further described.
Fig. 5 is that high light reverses the flow chart of implementation control method according to the preferred embodiment of the invention.As shown in Figure 5, the method can comprise following treatment step:
Step S502: high light reverses the raw video signal that control circuit obtains current AFE output;
Step S504: the comparator reversing in control circuit by high light is compared raw video signal and the reference threshold of AFE output, output switching signal; If exist the voltage of some or all of signal higher than reference threshold in the comparative result of comparator output, output low level switching signal; If the voltage that does not have some or all of signal in the comparative result of comparator output is during higher than reference threshold, output high level switching signal;
Step S506: the switching signal of exporting by OR circuit is selected to control to raw video signal, realizes and reverses rear output; If the switching signal of output is low level, the voltage of the some or all of signal higher than reference threshold is replaced to default high light and reverse reference voltage;
Step S508:DSP receives the vision signal after reverse, by prolonging exposure time or adjusting aperture size, carries out luminance signals adjustment final output.
Fig. 6 is according to the structured flowchart of the adjustment System of the camera video signal brightness of the embodiment of the present invention.As shown in Figure 6, the adjustment System of this camera video signal brightness can comprise: processor 10, this processor 10 can comprise: processing module 100, for the raw video signal receiving from image acquisition device being carried out to high light, reverse processing, wherein, image acquisition device, for gathering raw video signal; Sending module 102, for sending feedback signal according to the brightness of the vision signal after processing, wherein, feedback signal is used to indicate that automatic gain controller is adjusted the brightness of raw video signal and processor exports the vision signal through brightness adjustment to display via output interface.
Preferably, as shown in Figure 7, above-mentioned sending module 102 can comprise: acquiring unit 1020, for obtaining the brightness of the vision signal after processing; Transmitting element 1022, for sending feedback signal according to the brightness of the vision signal after processing, wherein, feedback signal is used to indicate automatic gain controller the brightness of raw video signal is adjusted.
Fig. 8 is according to the structured flowchart of the adjustment System of the another kind of camera video signal brightness of the embodiment of the present invention.As shown in Figure 8, the adjustment System of this camera video signal brightness can comprise: processor 10, this processor 10 can comprise: acquisition module 100, for obtaining through high light, reverse the raw video signal that control circuit is processed, wherein, high light reverses control circuit, reverses processing, and export processor to for the raw video signal receiving from image acquisition device being carried out to high light; Sending module 102, for sending feedback signal according to the brightness of the vision signal after processing, wherein, feedback signal is for adjusting the brightness of raw video signal and processor exports the vision signal through brightness adjustment to display via output interface.
Preferably, as shown in Figure 9, sending module 102 can comprise: acquiring unit 1020, for obtaining the brightness of the vision signal after processing; Transmitting element 1022, for sending feedback signal according to the brightness of the vision signal after processing, wherein, feedback signal is used to indicate automatic gain controller the brightness of raw video signal is adjusted.
Preferably, as shown in Figure 9, above-mentioned feedback signal can be automatic gaining controling signal; Said system can also comprise: automatic gain controller 20, this automatic gain controller 20 can comprise: receiver module 200, for receiving the automatic gaining controling signal that comes from processor, wherein, processor is determined the brightness multiplication factor to raw video signal according to the vision signal after processing, and sends automatic gaining controling signal to automatic gain controller; Processing module 202, for promoting the brightness of raw video signal according to automatic gaining controling signal.
Preferably, as shown in Figure 9, high light reverses control circuit 30, for the raw video signal receiving from automatic gain controller being carried out to high light reverse, processes and export to processor.
Preferably, as shown in Figure 9, high light reverses control circuit 30 and can comprise: whether the first comparison module 300, for receiving the raw video signal that comes from automatic gain controller, and exist the voltage of some or all of signal higher than the first predetermined threshold value in definite raw video signal; Select module 302, for the voltage that has some or all of signal at raw video signal during higher than the first predetermined threshold value, output low level switching signal, otherwise, output high level switching signal; Output module 304, for when receiving low level switching signal, the voltage of the some or all of signal higher than the first predetermined threshold value is replaced to default high light and reverse reference voltage, and export the vision signal after replacing to processor, or, when receiving high level switching signal, directly export raw video signal to processor.
Preferably, as shown in Figure 9, above-mentioned high light reverses control circuit 30 and can also comprise: the second comparison module 306, for receiving the automatic gaining controling signal that comes from processor, and judges according to automatic gaining controling signal whether the brightness of raw video signal is less than the second predetermined threshold value; If be less than, suppressed high light reverse control circuit raw video signal is carried out to high light reverse processing.
From above description, can find out, above-described embodiment has been realized following technique effect (it should be noted that these effects are effects that some preferred embodiment can reach): technical scheme provided by the present invention is carried out high light to the highlighted signal in raw video signal simultaneously and reversed processing and by feedback mechanism, the low bright signal in raw video signal carried out to luminance raising processing, can be widely used in market, parking lot, the bayonet sockets such as factory are local, not only reduced the production cost of hardware, but also can make the picture material obtained by watch-dog high-visible.
Obviously, those skilled in the art should be understood that, above-mentioned each module of the present invention or each step can realize with general calculation element, they can concentrate on single calculation element, or be distributed on the network that a plurality of calculation elements form, alternatively, they can be realized with the executable program code of calculation element, thereby, they can be stored in storage device and be carried out by calculation element, and in some cases, can carry out shown or described step with the order being different from herein, or they are made into respectively to each integrated circuit modules, or a plurality of modules in them or step are made into single integrated circuit module to be realized.Like this, the present invention is not restricted to any specific hardware and software combination.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (13)
1. a video camera of adjusting video luminance signal, is characterized in that, comprising:
Image acquisition device, for gathering raw video signal;
Processor, receives described raw video signal from described image acquisition device and carries out high light reverse processing, and send feedback signal according to the brightness of the vision signal after processing; Or, described processor, obtain through high light and reverse the raw video signal that control circuit is processed, and send described feedback signal according to the brightness of the vision signal after processing, wherein, described feedback signal is for the brightness of described raw video signal is adjusted, and described high light reverses control circuit, the described raw video signal receiving from described image acquisition device carries out high light and reverses processing, and exports described processor to;
Output interface, for exporting the vision signal through brightness adjustment to display unit.
2. video camera according to claim 1, is characterized in that, described image acquisition device is automatic gain controller;
Described processor, from described automatic gain controller, receive described raw video signal and carry out high light reverse processing, and send described feedback signal according to the brightness of the vision signal after described processing, indicate described automatic gain controller to adjust the brightness of described raw video signal; Or, described processor, obtain through high light and reverse the described raw video signal of processing, and send described feedback signal according to the brightness of the vision signal after described processing, indicate described automatic gain controller to adjust the brightness of described raw video signal.
3. video camera according to claim 2, is characterized in that, described feedback signal is automatic gaining controling signal;
Described automatic gain controller, according to described automatic gaining controling signal, promote the brightness of described raw video signal, wherein, described processor is determined the brightness multiplication factor to described raw video signal according to the vision signal after described processing, and sends described automatic gaining controling signal to described automatic gain controller.
4. video camera according to claim 2, is characterized in that,
Described high light reverses control circuit, the described raw video signal receiving is carried out to high light and reverse processing, and export described processor to from described automatic gain controller.
5. video camera according to claim 4, is characterized in that, described high light reverses control circuit and comprises:
The first comparator, is connected with described automatic gain controller, receives the described raw video signal from described automatic gain controller, and determines in described raw video signal whether exist the voltage of some or all of signal higher than the first predetermined threshold value;
OR circuit, be connected with described the first comparator, the voltage that has described some or all of signal in the comparative result of described the first comparator output is during higher than described the first predetermined threshold value, output low level switching signal, otherwise, output high level switching signal;
Analog switch, be connected with described OR circuit, when receiving described low level switching signal, the voltage of the described some or all of signal higher than described the first predetermined threshold value is replaced to default high light and reverse reference voltage, and export the vision signal after replacing to described processor, or, when receiving described high level switching signal, directly export described raw video signal to described processor.
6. video camera according to claim 5, is characterized in that, described high light reverses control circuit and also comprises:
The second comparator, its input is connected with described digital signal processor, its output is connected with described OR circuit, reception is from the automatic gaining controling signal of described processor, and judges according to described automatic gaining controling signal whether the brightness of described raw video signal is less than the second predetermined threshold value; If be less than, exported high level signal and suppress described raw video signal to carry out high light reverse processing.
7. a method of adjustment for camera video signal brightness, is characterized in that, comprising:
Processor carries out high light to the raw video signal receiving from described image acquisition device and reverses processing, and wherein, described image acquisition device gathers described raw video signal;
Described processor sends feedback signal according to the brightness of the vision signal after processing, wherein, described feedback signal is for adjusting the brightness of described raw video signal and described processor will export display to through the vision signal of brightness adjustment via output interface.
8. method according to claim 7, is characterized in that, described processor sends feedback signal according to the brightness of the vision signal after described processing and comprises:
Described processor obtains the brightness of the vision signal after described processing;
Described processor sends described feedback signal according to the brightness of the vision signal after described processing, and wherein, described feedback signal is used to indicate described automatic gain controller the brightness of described raw video signal is adjusted.
9. a method of adjustment for camera video signal brightness, is characterized in that, comprising:
Processor obtains through high light and reverses the raw video signal that control circuit is processed, wherein, described high light reverses control circuit the described raw video signal receiving from image acquisition device is carried out to high light reverse processing, and exports the vision signal after processing to described processor;
Described processor sends feedback signal according to the brightness of the vision signal after described processing, wherein, described feedback signal is for adjusting the brightness of described raw video signal and described processor will export display unit to through the vision signal of brightness adjustment via output interface.
10. method according to claim 9, is characterized in that, described processor sends described feedback signal according to the brightness of the vision signal after described processing and comprises:
Described processor obtains the brightness of the vision signal after described processing;
Described processor sends described feedback signal according to the brightness of the vision signal after described processing, and wherein, described feedback signal is used to indicate described automatic gain controller the brightness of described raw video signal is adjusted.
11. methods according to claim 10, is characterized in that, described feedback signal is automatic gaining controling signal; After described processor sends described feedback signal according to the brightness of the vision signal after described processing, also comprise:
Automatic gain controller receives the described automatic gaining controling signal that comes from described processor, wherein, described processor is determined the brightness multiplication factor to described raw video signal according to the vision signal after described processing, and sends described automatic gaining controling signal to described automatic gain controller;
Described automatic gain controller promotes the brightness of described raw video signal according to described automatic gaining controling signal.
12. methods according to claim 11, is characterized in that, described high light reverses control circuit to carry out high light to the described raw video signal receiving from image acquisition device and reverse and process, and export the vision signal after processing to described processor and comprise:
Described high light reverses control circuit and receives the described raw video signal that comes from described automatic gain controller, and determines in described raw video signal whether exist the voltage of some or all of signal higher than the first predetermined threshold value;
When described high light reverses voltage that control circuit exists described some or all of signal in described raw video signal higher than described the first predetermined threshold value, output low level switching signal, otherwise, output high level switching signal;
Described high light reverses control circuit when receiving described low level switching signal, the voltage of the described some or all of signal higher than described the first predetermined threshold value is replaced to default high light and reverse reference voltage, and export the vision signal after replacing to described processor, or, when receiving described high level switching signal, directly export described raw video signal to described processor.
13. methods according to claim 12, is characterized in that, described high light reverses control circuit to carry out high light to the described raw video signal receiving from described automatic gain controller and reverse and process and export to described processor and also comprise:
Described high light reverses control circuit reception and comes from the automatic gaining controling signal of described processor, and judges according to described automatic gaining controling signal whether the brightness of described raw video signal is less than the second predetermined threshold value;
If be less than, suppressed described high light reverse control circuit described raw video signal is carried out to high light reverse processing.
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