CN103491311A - Quick and automatic dimming method for complete dimming range - Google Patents
Quick and automatic dimming method for complete dimming range Download PDFInfo
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- CN103491311A CN103491311A CN201310384693.4A CN201310384693A CN103491311A CN 103491311 A CN103491311 A CN 103491311A CN 201310384693 A CN201310384693 A CN 201310384693A CN 103491311 A CN103491311 A CN 103491311A
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Abstract
The invention relates to a quick and automatic dimming method for a complete dimming range. The method comprises the following steps: changing the size of a lens screen according to the integral time section where integral time is located, adjusting the work section where the integral time is located, and expanding the dimming range so as to ensure that the integral time can quickly adjust changes, caused by scene changes, of luminance of output images in the whole dimming range; then, adjusting the luminance of the images through changing the integral time. According to the quick and automatic dimming method for the complete dimming range, in the complete dimming range, the luminance of the output images is adjusted through the integral time so as to realize quick dimming in the complete dimming range, the section where the integral time is located is used for deciding whether to adjust the lens screen, the size of the lense screen is changed to adjust the working section of the integral time so as to expand the dimming range, and hardware of a dimming system does not need changing.
Description
Technical field
The present invention relates to the optical image technology field, particularly a kind of electronic shutter and diaphragm compound mode, full dimming scope fast automatic light-dimming method.
Background technology
Imaging optical system is when being photographed or take pictures, difference due to season, weather, sun altitude, region and scene features, the brightness of scenery alters a great deal, for obtaining picture rich in detail, avoid the image detector overexposure, correctly controlling exposure is one of core technology of imaging optical system acquisition HD image.Optical imaging system General Requirements automatic light control system dimming scope is wide, speed is fast, flexibility and reliability, strong adaptability, to meet the requirement of light regulation under complex environment.The dimming mode of optical imaging system generally has three kinds, changes transmitance, the change time for exposure of optical system and changes clear aperature.Early stage image detector, containing electronic shutter, not take the diaphragm light modulation as main.Present most of image detector provides the function of electronic shutter, but the dimming scope of electronic shutter generally is difficult to practical requirement, so the diaphragm light modulation still is widely used in most systems.
The electronic shutter light modulation is to realize the time of integration by changing image detector, and the diaphragm light modulation is to realize by changing clear aperature.Directly obtain the best total of points time corresponding with the luminance reference image value by present image brightness value, the current time of integration and luminance reference image value, then write detector, next equals reference value substantially according to the image brightness value of best total of points time output constantly.Electronic shutter is realized the image detector change of the time of integration by programming, has rapidity, and irrelevant with the deviation size of present image brightness and luminance reference image value.But diaphragm is adjusted the bore of optical system by the driven by motor diaphragm mechanism, and adopt image brightness as the closed-loop control amount, refresh rate is low, and light modulation speed is slow.
The course of work of traditional compound mode is shown in Fig. 2, when the brightness of detector output image is greater than reference value, at first reduces the time of integration, and the time of integration, hour image brightness still was greater than reference value, reduces diaphragm to make image brightness to reference value; When the brightness of detector output image is less than reference value, at first adjust diaphragm, when diaphragm is maximum, image brightness still is less than reference value, increases and makes the time of integration image brightness to reference value.
Traditional compound mode has only been expanded the dimming scope of optical imaging system, and the work of diaphragm and the time of integration is relatively independent, is a kind of low level combination.Although the speed with an automatic light meter of the electronic shutter under compound mode is very fast, diaphragm light modulation speed is slower, is difficult to realize the quick light modulation in full dimming scope.
Summary of the invention
The present invention will solve technical problem of the prior art, and a kind of electronic shutter and diaphragm compound mode are provided, full dimming scope fast automatic light-dimming method.
In order to solve the problems of the technologies described above, technical scheme of the present invention is specific as follows:
Quick light-dimming method in a kind of full dimming scope comprises the following steps:
At first, according to the interval diaphragm size that the changes residing time of integration of the time of integration, adjust the residing operation interval time of integration, the expansion dimming scope, with guarantee the time of integration can rapid adjustment in whole dimming scope due to the variation of the output image brightness that scene changes was caused;
Then, adjust image brightness the time of integration by changing.
In technique scheme, the described time of integration, interval comprised the maximum functional interval, best effort interval and reliably working interval; The maximum functional interval comprises the best effort interval, and the best effort interval comprises the reliably working interval.
In technique scheme, according to the interval control residing time of integration of time of integration diaphragm action change diaphragm size, specifically comprise:
Exceed the best effort interval time of integration, adjust diaphragm and make to bounce back to the time of integration in the reliably working interval, when the time of integration is in the reliably working interval, diaphragm stops adjusting.
In technique scheme, according to the interval control residing time of integration of time of integration diaphragm action change diaphragm size, specifically comprise:
Whether exceed the interval diaphragm of adjusting of maximum functional the time of integration according to required adjustment: when required adjustment is greater than the maximum time of integration time of integration, enlarge fast aperture stop size; When required adjustment is less than the minimum value time of integration time of integration, reduce fast aperture stop size; When required adjustment, to exceed best effort the time of integration interval but do not exceed the maximum functional interval, slow-action lay the grain door screen.
In technique scheme, the method specifically comprises the following steps:
At first, light adjusting system initialization;
Then, make diaphragm bore maximum, the initial integration time T is set;
Again then, judge that the time of integration is whether in best effort:
In the best effort interval, judge that whether the time of integration is in the reliably working interval time of integration, is to adjust diaphragm to finish, otherwise continues to adjust diaphragm;
Not in the best effort interval, judge that whether the time of integration is in the maximum functional interval time of integration, and the time of integration is in the maximum functional interval, slow-action lay the grain door screen; The time of integration is the rapid adjustment diaphragm in the maximum functional interval not;
Finally, judge that whether brightness value is in the reference value interval:
Be directly to enter next circulation, judge that whether the time of integration is in best effort;
Otherwise calculate the best total of points time according to the current time of integration, present image brightness value, brightness reference value; Then carry out and adjust the brightness that the detector integrates time changes output image, enter next circulation, judge that whether the time of integration is in best effort.
The present invention has following beneficial effect:
The fast automatic light-dimming method of full dimming scope of the present invention, full dimming scope is interior by the brightness of adjusting the detector output image time of integration, realize the quick light modulation in full dimming scope, by the interval diaphragm that determines whether the to adjust of living in time of integration, adjust the operation interval expansion dimming scope of the time of integration by changing the diaphragm size, and do not need to change the hardware of light adjusting system.
The accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
Fig. 1 is composite type light adjusting system block diagram representation of the present invention;
The workflow schematic diagram that Fig. 2 is the box-like light adjusting system of traditional group;
Fig. 3 is to the definition schematic diagram in the interval time of integration in the present invention;
The workflow schematic diagram that Fig. 4 is the quick light adjusting system of composite type in the present invention.
Embodiment
Invention thought of the present invention is:
The fast automatic light-dimming method of full dimming scope of the present invention, do not changing fully under the condition of the box-like light adjusting system hardware of traditional group, full dimming scope is interior by adjusting the brightness of detector output image the time of integration, realize quick light modulation, by the interval diaphragm that determines whether the to adjust of living in time of integration, adjust the operation interval expansion dimming scope of the time of integration by changing the diaphragm size.
The fast automatic light-dimming method of full dimming scope of the present invention defined three the time of integration interval, the maximum functional interval, interval and the reliably working interval (Tmin<T1<T2<T3<T4<Tmax) of best effort, each section definition high threshold and low threshold value, see Fig. 3.Maximum functional time of integration interval is between the high threshold 306(Tmax in maximum functional time of integration interval 309) and low threshold value 301(Tmin) between, being minimum value and the maximum that can arrange the time of integration, is generally that the characteristic by detector or optical system itself is determined; The best effort interval of the time of integration is between the high threshold 305(T4 in best effort interval 308) and low threshold value 302(T1) between, be the foundation that judges whether to need to adjust the diaphragm size; The reliably working interval of the time of integration is between the high threshold 304(T3 in reliably working interval 307) and low threshold value 303(T2) between, be the foundation that judges whether to stop adjusting diaphragm.
During light adjusting system work, according to scene brightness, changing to adjust makes the output image brightness preservation near the image reference value time of integration, the best effort interval 308 that exceeds the time of integration when the time of integration, for avoiding continuing the time of integration to force limiting value between the progradation timesharing (Tmax or Tmin), adjust diaphragm, time of integration interval is bounced back in reliably working interval 307.The condition that the diaphragm adjustment starts is to have exceeded best effort interval 308 time of integration, and entered reliably working interval 307 time of integration of the condition that the diaphragm adjustment finishes, and when the time of integration, is less than T1, reduces more than diaphragm makes to increase to T2 the time of integration; When be greater than T4 the time of integration, increase diaphragm be decreased to below T3 the time of integration, thereby guarantee the variation of the output image brightness that can rapid adjustment in whole dimming scope cause due to scene changes the time of integration.
The speed of diaphragm adjustment by time of integration of required adjustment whether exceeding maximum functional time of integration interval 309 decides.The maximum functional interval 309 that has exceeded the time of integration when the time of integration of required adjustment, the time of integration, adjustment can not make image brightness force fast into the reference brightness value, the adjustment surplus of the time of integration is used up, and needs the rapid adjustment diaphragm to make to obtain the time of integration enough adjustment surpluses.Exceeded best effort interval 308 when the time of integration of required adjustment, but do not exceed yet maximum functional interval 309, adjust and still can change the output brightness of image the time of integration, the adjustment surplus of the time of integration has been less than the setting limiting value, at this moment adjust the adjustment surplus that diaphragm just is used for enlarging the time of integration, therefore adopt diaphragm to adjust at a slow speed.The advantage of adjusting at a slow speed is to make variation that the adjustment of the time of integration can the real-Time Compensation diaphragm impact on image brightness, makes the brightness value of output image only have minor variations, remains near brightness reference value.
Below in conjunction with accompanying drawing, the present invention is described in detail.
The hardware system of the composite type light adjusting system that the fast automatic light-dimming method of full dimming scope of the present invention is applicable and the hardware of conventional combination light adjusting system are in full accord, see Fig. 1, it comprises image detector 104 of control circuit 101, drive motors 102, diaphragm 103, having electronic shutter etc.But diaphragm closed-loop control amount is chosen the detector integrates time relevant to image brightness, but not image brightness.
Outer scene changes and to cause the brightness of detector 104 output images to depart from reference value, and control circuit 101 is according to of living inly intervally adjusting diaphragm 103 pore sizes and adjust 104 times of integration of detector according to detector output image brightness value and luminance reference image value the time of integration.
The workflow of the fast automatic light-dimming method of full dimming scope of the present invention is referring to Fig. 4, comprises the following steps:
At first, by the initialization of step 401 light adjusting system.
Then, perform step 402 and make diaphragm bore maximum, the initial integration time T is set.
Again then, perform step 403 and judge that the time of integration is whether in best effort:
In the best effort interval, perform step 404 and judge that whether the time of integration is in the reliably working interval time of integration, is to perform step 408 adjustment diaphragms to finish, otherwise continues to adjust diaphragm.
Not in the best effort interval, perform step 405 and judge that whether the time of integration is in the maximum functional interval time of integration, and in the maximum functional interval, perform step 407 slow-action lay the grain door screens the time of integration; Do not perform step 406 in the maximum functional interval time of integration, the rapid adjustment diaphragm.
Finally, perform step 409 and judge that whether brightness value is in the reference value interval:
Directly to enter next circulation;
Otherwise perform step 410 and calculate the best total of points time according to the current time of integration, present image brightness value, brightness reference value; Then perform step the brightness that 411 adjustment detector integrates times changed output image, enter next circulation.
Go round and begin again, complete fast automatic light modulation.
In above-mentioned specific embodiments, those skilled in the art know that the implication of " fast ", " at a slow speed " adjustment diaphragm, do not repeat them here.
Obviously, above-described embodiment is only for example clearly is described, and is not the restriction to execution mode.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without also giving all execution modes.And the apparent variation of being extended out thus or change are still among the protection range in the invention.
Claims (5)
1. the fast automatic light-dimming method of full dimming scope, is characterized in that, comprises the following steps:
At first, according to the interval diaphragm size that the changes residing time of integration of the time of integration, adjust the residing operation interval time of integration, the expansion dimming scope, with guarantee the time of integration can rapid adjustment in whole dimming scope due to the variation of the output image brightness that scene changes was caused;
Then, adjust image brightness the time of integration by changing.
2. the fast automatic light-dimming method of full dimming scope according to claim 1, is characterized in that,
The described time of integration, interval comprised the maximum functional interval, best effort interval and reliably working interval; The maximum functional interval comprises the best effort interval, and the best effort interval comprises the reliably working interval.
3. the fast automatic light-dimming method of full dimming scope according to claim 2, is characterized in that,
According to the interval control residing time of integration of time of integration diaphragm action change diaphragm size, specifically comprise:
Exceed the best effort interval time of integration, adjust diaphragm and make to bounce back to the time of integration in the reliably working interval, when the time of integration is in the reliably working interval, diaphragm stops adjusting.
4. the fast automatic light-dimming method of full dimming scope according to claim 2, is characterized in that,
According to the interval control residing time of integration of time of integration diaphragm action change diaphragm size, specifically comprise:
Whether exceed the interval diaphragm of adjusting of maximum functional the time of integration according to required adjustment: when required adjustment is greater than the maximum time of integration time of integration, enlarge fast aperture stop size; When required adjustment is less than the minimum value time of integration time of integration, reduce fast aperture stop size; When required adjustment, to exceed best effort the time of integration interval but do not exceed the maximum functional interval, slow-action lay the grain door screen.
5. according to the fast automatic light-dimming method of the described full dimming scope of any one in claim 2-4, it is characterized in that, specifically comprise the following steps:
At first, light adjusting system initialization;
Then, make diaphragm bore maximum, the initial integration time T is set;
Again then, judge that whether the time of integration is in the best effort interval:
In the best effort interval, judge that whether the time of integration is in the reliably working interval time of integration, is to adjust diaphragm to finish, otherwise continues to adjust diaphragm;
Not in the best effort interval, judge that whether the time of integration is in the maximum functional interval time of integration, and the time of integration is in the maximum functional interval, slow-action lay the grain door screen; The time of integration is the rapid adjustment diaphragm in the maximum functional interval not;
Finally, judge that whether brightness value is in the reference value interval:
Be directly to enter next circulation, judge that whether the time of integration is in best effort;
Otherwise calculate the best total of points time according to the current time of integration, present image brightness value, brightness reference value; Then adjust the brightness that the detector integrates time changes output image, enter next circulation, judge that whether the time of integration is in best effort.
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| CN201310384693.4A CN103491311B (en) | 2013-08-29 | 2013-08-29 | The complete fast automatic light-dimming method of dimming scope |
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| CN201310384693.4A CN103491311B (en) | 2013-08-29 | 2013-08-29 | The complete fast automatic light-dimming method of dimming scope |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104159042A (en) * | 2014-07-29 | 2014-11-19 | 中国科学院长春光学精密机械与物理研究所 | DMD quick dimming method for high-dynamic-range imaging |
| CN110661983A (en) * | 2019-11-12 | 2020-01-07 | 腾讯科技（深圳）有限公司 | Image acquisition method, device, equipment and storage medium |
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| CN104159042A (en) * | 2014-07-29 | 2014-11-19 | 中国科学院长春光学精密机械与物理研究所 | DMD quick dimming method for high-dynamic-range imaging |
| CN110661983A (en) * | 2019-11-12 | 2020-01-07 | 腾讯科技（深圳）有限公司 | Image acquisition method, device, equipment and storage medium |
| US12047683B2 (en) | 2019-11-12 | 2024-07-23 | Tencent Technology (Shenzhen) Company Limited | Image acquisition method and apparatus, device, and storage medium |
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| CN103491311B (en) | 2016-12-28 |
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