CN101212569A - Step-motor driving method for monitoring camera - Google Patents
Step-motor driving method for monitoring camera Download PDFInfo
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- CN101212569A CN101212569A CNA2006101480270A CN200610148027A CN101212569A CN 101212569 A CN101212569 A CN 101212569A CN A2006101480270 A CNA2006101480270 A CN A2006101480270A CN 200610148027 A CN200610148027 A CN 200610148027A CN 101212569 A CN101212569 A CN 101212569A
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Abstract
The invention relates to a method for driving a stepping motor of a monitoring camera, which comprises the following steps: a video signal of the self image-picking monitoring area in the monitoring camera starts to detect out a vertical blank (V_Blank) interval; a driving pulse of stepping motor carries out an intermittent outputting in the detected vertical blank interval; when the stepping motor of the monitoring camera is driven, due to the driving pulse of stepping motor is only outputted in the vertical blank interval of the video signal, if a noise occurs, the final video signal outputted by the self monitoring camera dost not contain the noise according to the driving of the stepping motor. Therefore, the user can enjoy a video image with a clear image quality.
Description
Technical area
The present invention is relevant with the step-motor driving method of monitoring camera, especially instigates the stepping motor by monitoring camera to drive the step-motor driving method that the noise that sends reaches minimized a kind of monitoring camera.
Background technology
Fig. 1 is as the formation schematic diagram of the general monitoring camera of diagram, the lens section (Lens) 10 that comprises the gathered light that is made of amplifying lens and condenser lens etc. cuts off daytime and the night (D﹠amp that filter (IR Cut Filter) and mould random pulse interference (Dummy Grass) etc. constitute by infrared ray; N) module 20, drive to transfer above-mentioned D﹠amp; The motor driven portion of the stepping motor 21 of N module 20 (Motor Driver) 22, with converting optical signals is the charge coupled cell (CCD:Charge Coupled Device) 30 of electric signal, eliminates the noise composition of the signal of exporting from above-mentioned CCD30 place and compensating gain and the parts CDS﹠amp that exports; AGC40 will be from above-mentioned CDS﹠amp; The analog signal of AGC40 place output is transformed to analog/digital (A/D) converter 50 of digital signal, the Digital Signal Processing portion (DSP) 60 that separates the output y/c signal from the vision signal place of above-mentioned digital conversion, the y/c signal of above-mentioned separation output is transformed to Analog signals'digital/simulation (D/A) converter 70, with the audio signal of above-mentioned analog converting (for example with the regulation grade, 6dB) the amplifier (Amp) 80 of amplification output, various pulses take place, and it is provided to above-mentioned CCD30, CDS﹠amp; AGC40, A/D converter 50, and the timing pulse generator (Timing Generator) 90 in the above-mentioned Digital Signal Processing portion 60, and the y/c signal that separates in the comfortable above-mentioned Digital Signal Processing portion 60 begins to judge the brightness of image, and the microcomputer 100 by the above-mentioned stepping motor 21 of above-mentioned motor driven portion's 22 controlling and driving in view of the above.
In above-mentioned formation, above-mentioned microcomputer 100 can be set at the image pickup mode of above-mentioned monitoring camera pattern in daytime (Day Mode) or Night (Night Mode) according to the brightness of image, when being set at daytime during pattern, above-mentioned microcomputer 100 is by the above-mentioned stepping motor 21 of above-mentioned motor driven portion's 22 rotation drivings, substitute output infrared ray cut-out filter between said lens portion 10 and CCD30, substitute transparent mould random pulse interference and make it dry and astringent.
In addition, when being set at Night, above-mentioned microcomputer 100 substitutes output mask random pulse interference between said lens portion 10 and CCD30, makes infrared ray cut-out filter dry and astringent.
On the one hand, above-mentioned microcomputer 100 is for setting above-mentioned daytime or Night, by above-mentioned motor driven portion 22 to the certain driving pulse of above-mentioned stepping motor (21) output.
But when driving above-mentioned stepping motor 21, above-mentioned driving pulse makes a noise, though above-mentioned monitoring camera has above-mentioned CDS﹠amp; AGC40, thus can be abating the noise to a certain degree, but when the above-mentioned noise that sends when certain value is above, according to above-mentioned CDS﹠amp; AGC40 just can not full remuneration.
Therefore, in this case, as shown in Figure 1, in the vision signal (V.OUT) of the final output in above-mentioned monitoring camera place, comprise noise, can cause the low problem of image quality thus.
Summary of the invention
Therefore, the present invention puts forward for addressing the above problem, when driving the stepping motor of monitoring camera, because only at the interval stepping motor driving pulse of exporting of the vertical blank (V_Blank) of vision signal, so driving according to stepping motor, even the generation noise can not comprise noise in the final video signal by monitoring camera output yet, the present invention provides a kind of step-motor driving method of monitoring camera for this purpose.
For reaching above-mentioned purpose, comprising the step that the vision signal of monitoring camera from the monitoring camera-shooting zone begins to detect the vertical blank interval, and the step of only carrying out intermittent output stepping motor driving pulse in the above-mentioned vertical blank interval that detects is its feature according to the step-motor driving method of monitoring camera of the present invention.
Effect of the present invention:
According to the step-motor driving method that constitutes monitoring camera of the present invention as above, when driving the stepping motor of monitoring camera, only in vertical blank (V_Blank) interval of vision signal, export above-mentioned stepping motor driving pulse, so driving according to stepping motor, even make a noise, in the vision signal of the final output in above-mentioned monitoring camera place, also can not comprise noise, so this is the very useful invention that finally can enjoy the video image of clear image quality.
For further specifying above-mentioned purpose of the present invention, design feature and effect, the present invention is described in detail below with reference to accompanying drawing.
Description of drawings
Fig. 1 represents: the formation schematic diagram that illustrates general monitoring camera.
Fig. 2 represents: the formation schematic diagram of an embodiment of the monitoring camera of diagram embodiment step-motor driving method of the present invention.
Fig. 3 represents: the vision signal in diagram monitoring camera-shooting zone, and with the interval corresponding VD signal of the vertical blank (V_Blank) of above-mentioned vision signal, and the output embodiment schematic diagram of past and stepping motor driving pulse of the present invention.
The symbol description of major part in the accompanying drawing:
10: lens section 20:D﹠amp; N (daytime and night) module
21: stepping motor 22: motor driven portion
30:CCD 40:CDS﹠amp; AGC (composition and compensating gain parts abate the noise)
50:A/D converter 60: Digital Signal Processing portion
70:D/A converter 80: amplifier
90: timing pulse generator 100: microcomputer
Embodiment
Below, with reference to accompanying drawing, the embodiment according to the step-motor driving method of monitoring camera of the present invention is described in detail.
Fig. 2 is as the formation schematic diagram of an embodiment of the monitoring camera of diagram embodiment step-motor driving method of the present invention, and is the same with Fig. 1, comprises lens section 10, D﹠amp; N (daytime and night) module 20, stepping motor 21, motor driven portion 22, CCD30 eliminates the noise composition of the signal of exporting from above-mentioned CCD30 place and compensating gain and the parts CDS﹠amp that exports; AGC40, A/D converter 50, Digital Signal Processing portion 60, D/A converter 70, amplifier 80, timing pulse generator 90, and microcomputer 100, at this moment, above-mentioned Digital Signal Processing portion (DSP) 60 begins to detect vertical blank (V_Blank) interval from the digital video signal of input, and provides certain signal (VD signal) to above-mentioned microcomputer 100 in view of the above.
The step-motor driving method of realizing in the monitoring camera that constitutes as above according to monitoring camera of the present invention is as follows.
At first, the above-mentioned monitoring camera that is used for security system etc. is that the making video of optics is become electric image, and with the device of its video recording/regeneration, the light of assembling by said lens portion 10 in above-mentioned CCD30 by light harvesting and accumulating by electric charge, then, the vertical and horizontal pulse of foundation generation in above-mentioned timing pulse generator 90 is simulation composition separately with its gathering and inputs to above-mentioned CDS﹠amp; AGC40.
At above-mentioned composition and the compensating gain parts CDS﹠amp of abating the noise; Among the AGC40, CDS is the abbreviation of the double sampling (Correlated Double Sampling:CDS) relevant with signal, owing to from the signal of above-mentioned CDS output, mixing various noise compositions and signal component, sampling noise composition or sampled signal composition separately separately, make extraction each other, thereby eliminate the noise composition in the above-mentioned signal component to a certain extent.And the variation and the above-mentioned CDS signal of automatic gain control AGC (Auto Gain Control) light are irrelevant, for reaching certain grade, compensate interests automatically.
So, CDS and AGC analog video signal are input to above-mentioned A/D converter 50, and are transformed to digital signal.
Below, above-mentioned Digital Signal Processing portion 60 is in the digital video signal of above-mentioned conversion, the briliancy Y-signal is according to grey scale signal, carrier chrominance signal C is according to carrier chrominance signal, handle each signal and output respectively, so the vision signal of output inputs in the outside video tape recorder (VCR) etc. by above-mentioned D/A converter 70 and amplifier 80 and videoed/regenerate.
In addition, above-mentioned Digital Signal Processing portion 60 is according to the input of above-mentioned digital video signal, begin to detect vertical blank (V_Blank) interval from above-mentioned digital video signal, and it is provided to above-mentioned microcomputer 100, above-mentioned vertical blank interval means the recovery time of the picture scan line of above-mentioned vision signal, can learn that in during this period of time vision signal is not scanned on picture.
And, above-mentioned Digital Signal Processing portion 60 also can be to the predetermined certain signal of above-mentioned microcomputer 100 outputs in above-mentioned vertical blank interval, it is the VD signal, in this case, because the size in vertical blank interval (approximately, 1.8msec) reserve in advance, above-mentioned vertical blank interval can be guaranteed to be in certain interval before and after the above-mentioned VD signal according to above-mentioned microcomputer 100 inner RTC.
Fig. 3 is the vision signal in diagram monitoring camera-shooting zone, with the interval corresponding VD signal of the vertical blank (V_Blank) of above-mentioned vision signal, and the output embodiment schematic diagram of past and stepping motor driving pulse of the present invention.
As mentioned above, above-mentioned microcomputer 100 is the daytime or the Night of basis of design image brilliance, export driving pulse to above-mentioned stepping motor 21 by above-mentioned motor driven portion 22, when driving above-mentioned stepping motor 21, make a noise according to above-mentioned driving pulse.
Even like that, in the past, as shown in Figure 3, thereby also continue to export driving pulse and cause more noise regardless of sending of above-mentioned noise, such noise intactly is loaded on the picture, thus it is low to have caused image quality.
Therefore, consider in the present invention by above-mentioned stepping motor 21 to drive the noise that causes, only above-mentioned stepping motor 21 driving pulses of output in the vertical blank interval of above-mentioned vision signal.
Promptly, because above-mentioned reason, above-mentioned microcomputer 100, as shown in Figure 3, the interval beyond the above-mentioned vertical blank interval is set at decay (Mute) interval, and does not export above-mentioned stepping motor 21 driving pulses, just in above-mentioned vertical blank interval, export above-mentioned stepping motor 21 driving pulses, when the above-mentioned driving pulse of output, from the angle to compensating between above-mentioned decay area, it is faster that the pulse period was exported ground than the past.
Give an example, as shown in Figure 3, if the cycle of above-mentioned driving pulse in the past is 1.5msec, just be the cycle in the present invention with 0.5msec, and only in above-mentioned vertical blank interval, export.
As mentioned above, consider sending of above-mentioned noise in the present invention, and only in the vertical blank interval of vision signal output above-mentioned stepping motor 21 driving pulses, so drive according to above-mentioned stepping motor 21, even make a noise, in the vision signal (V.OUT) of the final output in above-mentioned monitoring camera place, can not comprise noise yet.
Those of ordinary skill in the present technique zone, zone will be appreciated that, above embodiment is used for illustrating the present invention, and be not to be used as limitation of the invention, as long as in connotation scope of the present invention, all will drop in the scope of claims of the present invention variation, the modification of the above embodiment.
Claims (5)
1. the step-motor driving method of a monitoring camera is characterized in that may further comprise the steps:
The vision signal of monitoring camera from the monitoring camera-shooting zone begins to detect the step in vertical blank interval; And
Only in the above-mentioned vertical blank interval that detects, carry out the step of intermittent output stepping motor driving pulse.
2. the step-motor driving method of monitoring camera as claimed in claim 1 is characterized in that:
Above-mentioned stepping motor be transfer above-mentioned monitoring camera daytime and night module motor.
3. the step-motor driving method of monitoring camera as claimed in claim 1 is characterized in that:
To begin later on till the beginning viewpoint in following vertical blank interval, to be set between the decay area from above-mentioned vertical blank interval, and the above-mentioned driving pulse of output in not between this decay area.
4. the step-motor driving method of monitoring camera as claimed in claim 3 is characterized in that:
Above-mentioned driving pulse output step, from angle to compensating between above-mentioned decay area, in above-mentioned vertical blank interval to export above-mentioned driving pulse than both depositing the fast cycle more than 3 times.
5. the step-motor driving method of monitoring camera as claimed in claim 3 is characterized in that:
In the above-mentioned driving pulse output step, according to exporting above-mentioned driving pulse with certain VD signal of the interval corresponding output of above-mentioned vertical blank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101480270A CN101212569A (en) | 2006-12-26 | 2006-12-26 | Step-motor driving method for monitoring camera |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006101480270A CN101212569A (en) | 2006-12-26 | 2006-12-26 | Step-motor driving method for monitoring camera |
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| CN101212569A true CN101212569A (en) | 2008-07-02 |
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| CNA2006101480270A Pending CN101212569A (en) | 2006-12-26 | 2006-12-26 | Step-motor driving method for monitoring camera |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109407890A (en) * | 2018-07-27 | 2019-03-01 | 友达光电股份有限公司 | Touch display device and touch wake-up signal generation method thereof |
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2006
- 2006-12-26 CN CNA2006101480270A patent/CN101212569A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109407890A (en) * | 2018-07-27 | 2019-03-01 | 友达光电股份有限公司 | Touch display device and touch wake-up signal generation method thereof |
| CN109407890B (en) * | 2018-07-27 | 2022-02-08 | 友达光电股份有限公司 | Touch display device and touch wake-up signal generation method thereof |
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