CN102377947B - Exposure control device and method - Google Patents
Exposure control device and method Download PDFInfo
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- CN102377947B CN102377947B CN2011102599485A CN201110259948A CN102377947B CN 102377947 B CN102377947 B CN 102377947B CN 2011102599485 A CN2011102599485 A CN 2011102599485A CN 201110259948 A CN201110259948 A CN 201110259948A CN 102377947 B CN102377947 B CN 102377947B
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Abstract
The invention discloses an exposure control device and method. The exposure control method comprises the following steps of: reducing a working current of infrared emission equipment in a shooting photometry process, and acquiring an exposure time variation value after the working current is reduced; judging whether the ratio of the exposure time variation value to the reduced value of the working current is smaller than a first threshold value; and closing the infrared emission equipment and continuing shooting when the ratio is smaller than the first threshold value. According to the invention, infrared light can be accurately regulated according to the real-time variation of an outside light ray environment, so that the camera can be used for acquiring clear and stable images of a target under various light ray conditions.
Description
Technical field
The present invention relates to the camera technique field, relate in particular to a kind of exposure-control device and method.
Background technology
Video camera is when imaging, and the power of exposure light is controlled extremely important, and exposure parameter is generally controlled by time for exposure and aperture size.Time for exposure and the exposure light relation that is inversely proportional to, exposure light is stronger, so the time for exposure just shorter, otherwise exposure light is more weak, the time for exposure just need to be longer.The relation and the power of the size of aperture and exposure light is inversely proportional to, exposure light is stronger, controls aperture less, on the contrary exposure light is more weak, controls aperture larger.
For realizing that video camera works under darker environment, especially also can work night, only by controlling time for exposure and aperture size, obviously can not deal with problems, so introduced infrared light exposure compensating technology.Infrared light exposure compensating technology the important point is to make exposure light=natural daylight+infrared light, to increase the intensity of natural daylight in night or darker environment, overcome traditional cameras can not be in night or darker environment the defect of normal imaging, this video camera with infrared lamp is exactly thermal camera.
on November 7th, 2007, disclosed application number was: in the application for a patent for invention file of " 200710097458.3 ", a kind of exposal control method of digital picture is disclosed, the method is to calculate the initial edge energy value by the pixel brightness value in the digital picture of initial exposure value, and by changing exposure bias value, obtain a maximal margin energy value, exposure bias value corresponding to described maximal margin energy value is the optimum exposure offset, if the difference of described maximal margin energy value and described initial edge energy value is greater than a threshold value, described initial exposure value complement is repaid numerical value after described optimum exposure exposure bias value as present exposure value compensation, otherwise, directly use described initial exposure value as present exposure value compensation.
Although above-mentioned patent is improved traditional exposal control method, but it is to seek an optimum exposure offset according to the brightness value of pixel in the digital picture of initial exposure value, and this optimum exposure offset is not made a response fast with the real-time change of ambient light thread environment, therefore, the optimum exposure offset that only according to the brightness value of the Pixel of Digital Image of initial exposure value, obtains is inaccurate.
Summary of the invention
The technical problem that the present invention mainly solves is to provide a kind of exposure-control device and method, can adjust exactly infrared light according to the real-time change of ambient light thread environment, thereby can make video camera all can obtain the steady and audible image of object under the multi-light condition.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: a kind of exposal control method is provided, comprise the following steps: reduce the operating current of infrared transmitting set in shooting photometry process, and obtain the time for exposure changing value after the minimizing operating current; Judge that whether ratio between described time for exposure changing value and operating current minimizing value is less than first threshold; Less than first threshold the time, close described infrared transmitting set and continue shooting.
Wherein, in described minimizing shooting photometry process, the action of the operating current of infrared transmitting set comprises: the operating current that reduces the above infrared transmitting set total current of infrared transmitting set at least four/one in shooting photometry process.
Wherein, before in described minimizing shooting photometry process, the operating current of infrared transmitting set moves, comprise: obtain the first time for exposure in shooting photometry process, wherein, described the first time for exposure is the current time for exposure under described infrared transmitting set opening; Judge that whether described the first time for exposure is greater than the Second Threshold that sets in advance in this locality; If whether the first time for exposure, greater than Second Threshold, judged described the first time for exposure greater than the 3rd threshold value that sets in advance in this locality, described the 3rd threshold value is greater than Second Threshold; If the first time for exposure is greater than the 3rd threshold value, increase the operating current of described infrared transmitting set to increase its infrared emitting intensity, thereby reduce described the first time for exposure, make described the first time for exposure after minimizing greater than described Second Threshold and less than described the 3rd threshold value.
Wherein, describedly judge that whether the first time for exposure also comprised greater than setting in advance after the step of the Second Threshold of this locality: if the first time for exposure, less than Second Threshold, reduce the operating current of described infrared transmitting set to reduce infrared emitting intensity.
Wherein, described close described infrared transmitting set after, also comprise before obtaining the step of the first time for exposure: obtain the second time for exposure in shooting photometry process, wherein, described the second time for exposure is the current time for exposure under described infrared transmitting set closed condition; Whether judge described the second time for exposure greater than the 4th threshold value that sets in advance in this locality, described the 4th threshold value is less than Second Threshold; If the second time for exposure, greater than the 4th threshold value, sent the first control signal to described infrared transmitting set described infrared transmitting set is opened.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: a kind of exposure-control device is provided, comprises: electric current reduces module, is used for reducing the operating current of shooting photometry process infrared transmitting set; The first time for exposure acquisition module, be used for obtaining the time for exposure changing value that reduces operating current and cause after electric current reduces unit minimizing operating current; The first judge module, be used for judging that whether ratio between described time for exposure changing value and operating current minimizing value is less than first threshold; Infrared closing module, be used for less than first threshold the time, closes described infrared transmitting set and continue shooting.
Wherein, described device comprises: described electric current reduces module and specifically is used for reducing the operating current of shooting photometry process infrared transmitting set 1/4 above infrared transmitting set total current.
Wherein, described device comprises: the second time for exposure acquisition module: be used for obtaining the first time for exposure of shooting photometry process, wherein, described the first time for exposure is the current time for exposure under described infrared transmitting set opening; The second judge module: be used for judging that whether described the first time for exposure is greater than the Second Threshold that sets in advance in this locality; The 3rd judge module: be used for the second judge module draw the first time for exposure greater than Second Threshold after, whether judge described the first time for exposure greater than the 3rd threshold value that sets in advance in this locality, described the 3rd threshold value is greater than Second Threshold; The first infrared adjusting module: be used in the first time for exposure during greater than the 3rd threshold value, increase the operating current of described infrared transmitting set to increase infrared emitting intensity, thereby reduce described the first time for exposure, make described the first time for exposure after minimizing greater than described Second Threshold and less than described the 3rd threshold value.
Wherein, described device comprises: the second infrared adjusting module: be used for judging for the first time for exposure during less than the Second Threshold that sets in advance in this locality when the second judge module, reduce the operating current of described infrared transmitting set with minimizing infrared emitting intensity.
Wherein, described device also comprises: the 3rd infrared adjusting module: be used for judging for the first time for exposure during less than the 3rd threshold value, the infrared emitting intensity of the described infrared transmitting set of maintenance when the 3rd judge module; The 3rd time for exposure acquisition module: be used for obtaining the second time for exposure of shooting photometry process, wherein, described the second time for exposure is the current time for exposure under described infrared transmitting set closed condition; The 4th judge module: judge that whether described the second time for exposure is greater than the 4th threshold value that sets in advance in this locality; Infrared opening module: be used for, sending the first control signal to described infrared transmitting set described infrared transmitting set being opened during greater than the 4th threshold value in the second time for exposure.
the invention has the beneficial effects as follows: be different from prior art only according to the situation of brightness value to obtain the optimum exposure offset but to be inaccurate of the Pixel of Digital Image of initial exposure value, the present invention determines whether and need to close infrared transmitting set by analysis infrared light size and the pace of change between the time for exposure, judge that namely whether ratio between time for exposure changing value and operating current minimizing value is less than certain threshold value, when this ratio less than certain threshold values the time, think that the light energy that infrared transmitting set produces can ignore on the impact of integrated environment light, should close infrared transmitting set, thereby can be so that video camera be operated under the multi-light condition, all can obtain the steady and audible image of object, also reduce simultaneously energy consumption.
Above-mentioned ratio is namely closed the mentality of designing of infrared transmitting set less than certain threshold values, while finding exposure value less than certain threshold value in the shooting process, need to judge whether the result less than certain threshold value is caused by infrared light, if not, illustrate infrared transmitting set on the shooting impact can ignore, also still can normally make a video recording even therefore close infrared transmitting set, otherwise not close infrared transmitting set.
In the more embodiment of the present invention, judge that by the time for exposure exposure bias value is whether in preset range, such optimum exposure offset is to obtain exactly according to the real-time change of ambient light thread environment, thereby further make video camera be operated under the multi-light condition, all can obtain the steady and audible image of object.
Description of drawings
Fig. 1 is the flow chart of steps of exposal control method embodiment one of the present invention;
Fig. 2 is the flow chart of steps of exposal control method embodiment two of the present invention;
Fig. 3 is the flow chart of steps of exposal control method embodiment three of the present invention;
Fig. 4 is the flow chart of steps of exposal control method embodiment four of the present invention;
Fig. 5 is the block diagram of exposure-control device embodiment one of the present invention;
Fig. 6 is the block diagram of exposure-control device embodiment two of the present invention;
Fig. 7 is the block diagram of exposure-control device embodiment three of the present invention;
Fig. 8 is the block diagram of exposure-control device embodiment four of the present invention.
Embodiment
Below, reach in conjunction with specific embodiments accompanying drawing, the present invention is made detailed description.
The invention provides a kind of exposal control method embodiment, comprise the following steps: reduce the operating current of infrared transmitting set in shooting photometry process, and obtain the time for exposure changing value after the minimizing operating current; Judge that whether ratio between described time for exposure changing value and operating current minimizing value is less than first threshold; Less than first threshold the time, close described infrared transmitting set and continue shooting.
more than be appreciated that, the present invention determines whether and need to close infrared transmitting set by analysis infrared light size and the pace of change between the time for exposure, judge that namely whether ratio between time for exposure changing value and operating current minimizing value is less than certain threshold value, when this ratio less than certain threshold values the time, think that the light energy that infrared transmitting set produces can ignore on the impact of integrated environment light, should close infrared transmitting set, thereby can be so that video camera be operated under the multi-light condition, all can obtain the steady and audible image of object, also reduce simultaneously energy consumption.
See also Fig. 1, the embodiment one of exposal control method of the present invention comprises the following steps:
Step 101: obtain the first time for exposure in shooting photometry process, this first time for exposure is the current time for exposure under the infrared transmitting set opening;
Under the state that infrared transmitting set is opened, object is exposed, to obtain the current time for exposure, light intensity during due to current time for exposure and the video camera imaging relation that is inversely proportional to, namely after infrared transmitter is opened, the video camera imaging effect preferably the time, has the time for exposure an of the best, take this best time for exposure, judges as basis whether infrared light is enough.
Step 102: judge that whether the first time for exposure is greater than the Second Threshold that sets in advance in this locality;
Set in advance the Second Threshold in this locality, it is the lower limit of luminous flux imaging effect first time for exposure preferably time of Infrared and the comprehensive formation of natural daylight of infrared transmitting set emission, during lower than Second Threshold, prove that light is too strong when the first time for exposure, need to adjust.
Step 103: if whether the first time for exposure, greater than Second Threshold, judged this first time for exposure greater than the 3rd threshold value that sets in advance in this locality, described the 3rd threshold value is greater than Second Threshold;
Set in advance the 3rd threshold value in this locality, the higher limit of first time for exposure that was the Infrared of infrared transmitting set emission and whole light quantity imaging effect that natural daylight is combined to form preferably the time,, a little less than proving that light too, need to adjust during higher than the 3rd threshold value when the first time for exposure.
Step 104:, if the first time for exposure, greater than the 3rd threshold value, increased the infrared emitting intensity of this infrared transmitting set,, to reduce this first time for exposure, make this first time for exposure greater than this Second Threshold and less than the 3rd threshold value;
By controlling the infrared emitting intensity of infrared transmitting set, adjust whole light quantity, the first time for exposure was controlled between Second Threshold and the 3rd threshold value, can make imaging effect best.The light power of external environment changed according to the time can be different, only have the infra-red intensity of controlling infrared transmitting set, and the whole light quantity that makes natural daylight and infrared ray form remains on optimum value, and imaging effect just reaches best like this.
Step 105: reduce the operating current of infrared transmitting set in shooting photometry process, and obtain the time for exposure changing value after the minimizing operating current;
In the shooting process,, for further infrared light being adjusted, can reduce the operating current of infrared transmitting set in shooting photometry process when meeting certain condition, and obtain the time for exposure changing value after the minimizing operating current.
Wherein, can reduce the operating current of the above infrared transmitting set total current of infrared transmitting set at least four/one in shooting photometry process.
Step 106: judge that whether ratio between described time for exposure changing value and operating current minimizing value is less than first threshold;
The setting of described first threshold and current exposure value have relation, smaller at current exposure value, to such an extent as to likely think while need not infrared transmitting set auxiliary, set the first threshold of this time point, whether less than this threshold value, thinking has the auxiliary of infrared transmitting set can be not influential to current shooting; Obviously, this first threshold can obtain in actual test, can certainly be a scope.
Step 107: less than first threshold the time, close described infrared transmitting set and continue shooting.
As aforementioned, ratio between time for exposure changing value and operating current minimizing value is less than first threshold, whether have infrared transmitting set auxiliary can to current shooting not influential, can close infrared transmitting set fully if thinking, therefore close described infrared transmitting set and continue shooting.
Be different from the defect that optimum exposure offset that prior art only obtains according to the brightness value of the Pixel of Digital Image of initial exposure value is inaccurate, the present invention judges that by the time for exposure exposure bias value is whether in preset range, such optimum exposure offset relies on the judgement to the first time for exposure, can be according to the infrared emitting intensity of the real-time adjustment infrared transmitting set of ambient light thread environment, make exposure light flux reach an optimum value, thereby can, so that video camera is operated under the multi-light condition, all can obtain the steady and audible image of object; Simultaneously, also by analysis infrared light size and the pace of change between the time for exposure, determine whether and need to close infrared lamp, judge that namely whether ratio between time for exposure changing value and operating current minimizing value is less than certain threshold value, when this ratio less than certain threshold values the time, think that the light energy that infrared lamp produces can ignore on the impact of integrated environment light, should close infrared lamp, thereby reduce energy consumption.
In above-described embodiment, be by the image perception element of video camera such as the photosensitive property of Sensor, judge whether current environment needs switch infrared transmitting set such as infrared lamp.And the photosensitive property of Sensor is embodied in its time for exposure AET, and brighter AET is less for environment, otherwise the darker AET of environment is larger.
Greater than a certain threshold values Thr0 the time, open infrared lamp as AET.
, think and need to judge in current environment less than a certain threshold values Thr1 the time as AET, whether by infrared light, made, if so, be not related to infrared lamp, if not closing infrared lamp.Comprise natural daylight and infrared light in the middle of the sensitization of Sensor.
Such as the current time for exposure is AETn, and current infrared lamp energy E n, the energy of infrared lamp is directly proportional to its electric current, and current infrared electric current is In, reduces infrared lamp electric current △ I, and the time for exposure is changed to △ AET, establishes K=△ AET/ △ I.As △ I〉1/4I and K be less than a certain threshold values Kmin(first threshold) time, think that the infrared lamp energy, on the not impact of integrated environment light, should close infrared lamp.
See also Fig. 2, the embodiment two of exposal control method of the present invention comprises the following steps:
Step 201: obtain the first time for exposure in shooting photometry process, this first time for exposure is the current time for exposure under the infrared transmitting set opening;
Step 202: judge that whether this first time for exposure is greater than the Second Threshold that sets in advance in this locality;
Step 203: if the first time for exposure, less than Second Threshold, reduce the infrared emitting intensity of this infrared transmitting set;
Step 204: if the first time for exposure, greater than Second Threshold, judge that whether this first time for exposure is greater than the 3rd threshold value that sets in advance in this locality;
Step 205:, if the first time for exposure, greater than the 3rd threshold value, increased the infrared emitting intensity of this infrared transmitting set,, to reduce this first time for exposure, make this first time for exposure greater than this Second Threshold and less than the 3rd threshold value.
In other embodiments, step 203 and the step 204 of above-described embodiment two are exchanged, and also can realize goal of the invention of the present invention.In the present embodiment, set and worked as for the first time for exposure less than Second Threshold, reduced the infrared emitting intensity of this infrared transmitting set; The whole light quantity that makes natural daylight and infrared ray form remains on optimum value, and imaging effect just reaches best like this.
See also Fig. 3, the embodiment three of exposal control method of the present invention comprises the following steps:
Step 301: obtain the first time for exposure in shooting photometry process, this first time for exposure is the current time for exposure under the infrared transmitting set opening;
Step 302: judge that whether this first time for exposure is greater than the Second Threshold that sets in advance in this locality;
Step 303: if the first time for exposure, less than Second Threshold, reduce the infrared emitting intensity of this infrared transmitting set;
Step 304: if the first time for exposure, greater than Second Threshold, judge that whether this first time for exposure is greater than the 3rd threshold value that sets in advance in this locality;
Step 305: if the first time for exposure, less than the 3rd threshold value, keep the infrared emitting intensity of this infrared transmitting set;
Step 306:, if the first time for exposure, greater than the 3rd threshold value, increased the infrared emitting intensity of this infrared transmitting set,, to reduce this first time for exposure, make this first time for exposure greater than this Second Threshold and less than the 3rd threshold value.
In other embodiments, step 203 and the step 204 of above-described embodiment three are exchanged, and step 305 and step 306 are exchanged, and also can realize goal of the invention of the present invention.
In this embodiment, when the first time for exposure during less than the 3rd threshold value, just show present infrared compensation rate, only need to keep the emissive porwer of existing infrared transmitting set can realize that the whole light quantity that natural daylight and infrared ray form remains on optimum value, the imaging effect of video camera is best.
See also Fig. 4, the embodiment four of exposal control method of the present invention comprises the following steps:
Step 401: obtain the second time for exposure in shooting photometry process, this second time for exposure is the current time for exposure under the infrared transmitting set closed condition;
Step 402: whether judge this second time for exposure greater than the 4th threshold value that sets in advance in this locality, described the 4th threshold value is less than Second Threshold;
Step 403: if the second time for exposure, greater than the 4th threshold value, to this infrared transmitting set, send first control signal this infrared transmitting set opened;
Step 404: obtained for the first time for exposure, this first time for exposure is the current time for exposure under the infrared transmitting set opening;
Step 405: judge that whether this first time for exposure is greater than the Second Threshold that sets in advance in this locality;
Step 406: if the first time for exposure, less than Second Threshold, reduce the infrared emitting intensity of this infrared transmitting set;
Step 407: if the first time for exposure, greater than Second Threshold, judge that whether this first time for exposure is greater than the 3rd threshold value that sets in advance in this locality;
Step 408: if the first time for exposure, less than the 3rd threshold value, keep the infrared emitting intensity of this infrared transmitting set;
Step 409:, if the first time for exposure, greater than the 3rd threshold value, increased the infrared emitting intensity of this infrared transmitting set,, to reduce this first time for exposure, make this first time for exposure greater than this Second Threshold and less than the 3rd threshold value.
In this embodiment, obtained for the second time for exposure, and according to the second time for exposure, determine whether and need to open infrared transmitting set, the 4th threshold value is the threshold value that judges whether infrared transmitting set is opened, surpass the 4th threshold value and represent that natural daylight light is inadequate, need infrared light to compensate.When the needs infrared light compensates, continue to judge whether infrared light enough reaches the optimal compensation effect, this just needs a judgement basis, so introduced Second Threshold and the 3rd threshold value, while only having the current time for exposure between Second Threshold and the 3rd threshold value, just can reach best infrared offset, make video camera obtain target object image the most clearly.Infrared transmitting set is to adjust the power of Infrared by the power of infrared lamp.The current time for exposure during less than Second Threshold, should strengthen infrared light, with the be taken infrared light intensity in zone of increase.The current time for exposure during greater than the 3rd threshold value, should be weakened infrared light, to weaken the infrared light intensity in the zone that is taken.
The infrared emitting intensity of the infrared transmitting set that is somebody's turn to do in the above-described embodiments, is to regulate by the pulse width modulation of controlling drive current.
In addition, the present invention also provides exposure-control device embodiment, and it comprises:
Electric current reduces module, is used for reducing the operating current of shooting photometry process infrared transmitting set;
The first time for exposure acquisition module, be used for obtaining the time for exposure changing value that reduces operating current and cause after electric current reduces unit minimizing operating current;
The first judge module, be used for judging that whether ratio between described time for exposure changing value and operating current minimizing value is less than first threshold;
Infrared closing module, be used for less than first threshold the time, closes described infrared transmitting set and continue shooting.
By said structure, can close infrared transmitting set when need not the auxiliary shooting of infrared light, save energy consumption.
In one embodiment, described electric current reduces module specifically for the operating current that reduces shooting photometry process infrared transmitting set 1/4 above infrared transmitting set total current.
See also Fig. 5, exposure-control device embodiment one of the present invention comprises:
The second time for exposure acquisition module 501: the first time for exposure that is used for obtaining shooting photometry process;
The second judge module 502: be used for judging that whether the first time for exposure that the second time for exposure acquisition module 501 obtains is greater than the Second Threshold that sets in advance in this locality;
The 3rd judge module 503: be used for the second judge module 502 judge the first time for exposure greater than Second Threshold after, then judge that whether this first time for exposure is greater than the 3rd threshold value that sets in advance in this locality;
The first infrared adjusting module 504: be used for the 3rd judge module 503 and judged for the first time for exposure during greater than the 3rd threshold value, increase the infrared emitting intensity of this infrared transmitting set,, to reduce this first time for exposure, make this first time for exposure greater than this Second Threshold and less than the 3rd threshold value.
Be different from the defect that optimum exposure offset that prior art only obtains according to the brightness value of the Pixel of Digital Image of initial exposure value is inaccurate, the present invention judges that by the time for exposure exposure bias value is whether in preset range, such optimum exposure offset is to obtain exactly according to the real-time change of ambient light thread environment, thereby can, so that video camera is operated under the multi-light condition, all can obtain the steady and audible image of object.
in this embodiment, the second time for exposure acquisition module 501 is after obtaining for the first time for exposure, send in the second judge module 502 and process, the second judge module 502 judges that whether the first time for exposure is greater than the first threshold values that sets in advance in this locality, the second judge module 502 draw the first time for exposure greater than the first threshold values after, the 3rd judge module 503 continues the first time for exposure was judged, see whether greater than the second threshold values that sets in advance in this locality, the first time for exposure is during greater than the 3rd threshold value, send instructions in the first infrared adjusting module 504, increase the infrared emitting intensity of this infrared transmitting set, to reduce this first time for exposure, make this first time for exposure greater than this Second Threshold and less than the 3rd threshold value.
See also Fig. 6, exposure-control device embodiment two of the present invention comprises:
The second time for exposure acquisition module 601: the first time for exposure that is used for obtaining shooting photometry process;
The second judge module 602: be used for judging that whether the first time for exposure that the second time for exposure acquisition module 601 obtains is greater than the Second Threshold that sets in advance in this locality;
The 3rd judge module 603: be used for the second judge module 602 judge the first time for exposure greater than Second Threshold after, judge that whether this first time for exposure is greater than the 3rd threshold value that sets in advance in this locality;
The first infrared adjusting module 604: be used for the 3rd judge module 603 and judged for the first time for exposure during greater than the 3rd threshold value, increase the infrared emitting intensity of this infrared transmitting set,, to reduce this first time for exposure, make this first time for exposure greater than this Second Threshold and less than the 3rd threshold value;
The second infrared adjusting module 605: be used for the second judge module 602 and judged for the first time for exposure less than the Second Threshold that sets in advance in this locality, reduce the infrared emitting intensity of this infrared transmitting set.
In this embodiment, the second time for exposure acquisition module 601 is after obtaining for the first time for exposure, send in the second judge module 602 and process, the second judge module 602 judges that whether the first time for exposure is greater than the first threshold values that sets in advance in this locality, the second judge module 602 draw the first time for exposure less than the first threshold values after, send instructions in the second infrared adjusting module 605, to reduce the infrared emitting intensity of this infrared transmitting set; The second judge module 602 draw the first time for exposure greater than the first threshold values after, the 3rd judge module 503 continues the first time for exposure was judged, see whether greater than the second threshold values that sets in advance in this locality, the first time for exposure is during greater than the 3rd threshold value, send instructions in the first infrared adjusting module 604,, to increase the infrared emitting intensity of this infrared transmitting set,, to reduce this first time for exposure, make this first time for exposure greater than this Second Threshold and less than the 3rd threshold value.
See also Fig. 7, exposure-control device embodiment three of the present invention comprises:
The second time for exposure acquisition module 701: be used for obtaining the first time for exposure under the infrared transmitting set opening, i.e. the current time for exposure;
The second judge module 702: be used for judging that whether the first time for exposure that the second time for exposure acquisition module 701 obtains is greater than the Second Threshold that sets in advance in this locality;
The 3rd judge module 703: be used for the second judge module 702 judge the first time for exposure greater than Second Threshold after, judge that whether this first time for exposure is greater than the 3rd threshold value that sets in advance in this locality;
The first infrared adjusting module 704: be used for the 3rd judge module 703 and judged for the first time for exposure during greater than the 3rd threshold value, increase the infrared emitting intensity of this infrared transmitting set,, to reduce this first time for exposure, make this first time for exposure greater than this Second Threshold and less than the 3rd threshold value;
The second infrared adjusting module 705: be used for for second 702 the first time for exposure of judgement of judge module less than the Second Threshold that sets in advance in this locality, reduce the infrared emitting intensity of this infrared transmitting set;
The 3rd infrared adjusting module 706: be used for the 3rd judge module 703 and judged for the first time for exposure during less than the 3rd threshold value, keep the infrared emitting intensity of this infrared transmitting set.
In this embodiment, the second time for exposure acquisition module 701 is after obtaining for the first time for exposure, send in the second judge module 702 and process, the second judge module 702 judges that whether the first time for exposure is greater than the first threshold values that sets in advance in this locality, the second judge module 702 draw the first time for exposure less than the first threshold values after, send instructions in the second infrared adjusting module 705, to reduce the infrared emitting intensity of this infrared transmitting set; The second judge module 602 draw the first time for exposure greater than the first threshold values after, the 3rd judge module 703 continues the first time for exposure was judged, see whether greater than the second threshold values that sets in advance in this locality, the first time for exposure is during less than the second threshold values, send instructions in the 3rd infrared adjusting module 706, keep the infrared emitting intensity of this infrared transmitting set; When the first time for exposure during greater than the 3rd threshold value, send instructions in the first infrared adjusting module 704,, to increase the infrared emitting intensity of this infrared transmitting set,, to reduce this first time for exposure, make this first time for exposure greater than this Second Threshold and less than the 3rd threshold value.
See also Fig. 8, exposure-control device embodiment four of the present invention comprises:
The 3rd time for exposure acquisition module 801: be used for obtaining infrared transmitting set and descend in off position the second time for exposure of shooting photometry process;
The 4th judge module 802: judge that whether the second time for exposure that the 3rd time for exposure acquisition module 801 obtains is greater than the 4th threshold value that sets in advance in this locality;
Infrared opening module 803: be used for the 4th judge module 802 and judged for the second time for exposure during greater than the 4th threshold value, send first control signal to this infrared transmitting set this infrared transmitting set is opened;
The second time for exposure acquisition module 804: be used for obtaining the first time for exposure under the infrared transmitting set opening, i.e. the current time for exposure;
The second judge module 805: be used for judging that whether the first time for exposure that the second time for exposure acquisition module 804 obtains is greater than the Second Threshold that sets in advance in this locality;
The 3rd judge module 806: be used for the second judge module 805 judge the first time for exposure greater than Second Threshold after, judge that whether this first time for exposure is greater than the 3rd threshold value that sets in advance in this locality;
The first infrared adjusting module 807: be used for judging for the first time for exposure during greater than the 3rd threshold value at the 3rd judge module 806, increase the infrared emitting intensity of this infrared transmitting set,, to reduce this first time for exposure, make this first time for exposure greater than this Second Threshold and less than the 3rd threshold value;
The second infrared adjusting module 808: be used for judging for the first time for exposure less than the Second Threshold that sets in advance in this locality at the second judge module 805, reduce the infrared emitting intensity of this infrared transmitting set;
The 3rd infrared adjusting module 809: be used for judging for the first time for exposure during less than the 3rd threshold value at the 3rd judge module 806, keep the infrared emitting intensity of this infrared transmitting set.
In this embodiment, the 3rd time for exposure acquisition module 801 obtained for the second time for exposure, send in the 4th judge module 802 and process, the 4th judge module 802 judges that whether the second time for exposure is greater than the 3rd threshold values that sets in advance in this locality, the 3rd threshold values is the critical threshold value of opening infrared transmitting set, if the second time for exposure sent first control signal over infrared opening module 803 after the 3rd threshold values to this infrared transmitting set, opens infrared transmitting set.In the situation that infrared transmitting set is opened, the second time for exposure acquisition module 804 obtained for the first time for exposure, send in the second judge module 805 and process, the second judge module 805 judges that whether the first time for exposure is greater than the first threshold values that sets in advance in this locality, the second judge module 805 draw the first time for exposure less than the first threshold values after, send instructions in the second infrared adjusting module 808, to reduce the infrared emitting intensity of this infrared transmitting set; The second judge module 805 draw the first time for exposure greater than the first threshold values after, the 3rd judge module 806 continues the first time for exposure was judged, see whether greater than the second threshold values that sets in advance in this locality, the first time for exposure is during less than the second threshold values, send instructions in the 3rd infrared adjusting module 809, keep the infrared emitting intensity of this infrared transmitting set; When the first time for exposure during greater than the 3rd threshold value, send instructions in the first infrared adjusting module 807,, to increase the infrared emitting intensity of this infrared transmitting set,, to reduce this first time for exposure, make this first time for exposure greater than this Second Threshold and less than the 3rd threshold value.
In the above-described embodiments, this device also comprises the pulse width modulation module, is used for driving this infrared transmitting set.
The foregoing is only embodiments of the invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or equivalent flow process conversion that utilizes specification of the present invention and accompanying drawing content to do; or directly or indirectly be used in other relevant technical fields, all in like manner be included in scope of patent protection of the present invention.
Claims (9)
1. an exposal control method, is characterized in that, comprises the following steps:
Reduce the operating current of infrared transmitting set in shooting photometry process, and obtain the time for exposure changing value after the minimizing operating current;
Judge that whether ratio between described time for exposure changing value and operating current minimizing value is less than first threshold;
Less than first threshold the time, close described infrared transmitting set and continue shooting.
2. exposal control method according to claim 1, is characterized in that, in described minimizing shooting photometry process, the action of the operating current of infrared transmitting set comprises:
Reduce the operating current of the above infrared transmitting set total current of infrared transmitting set at least four/one in shooting photometry process.
3. exposal control method according to claim 1 and 2, is characterized in that, before the operating current action of infrared transmitting set, comprising in described minimizing shooting photometry process:
Obtain the first time for exposure in shooting photometry process, wherein, described the first time for exposure is the current time for exposure under described infrared transmitting set opening;
Judge that whether described the first time for exposure is greater than the Second Threshold that sets in advance in this locality;
If whether the first time for exposure, greater than Second Threshold, judged described the first time for exposure greater than the 3rd threshold value that sets in advance in this locality, described the 3rd threshold value is greater than Second Threshold;
If the first time for exposure is greater than the 3rd threshold value, increase the operating current of described infrared transmitting set to increase its infrared emitting intensity, thereby reduce described the first time for exposure, make described the first time for exposure after minimizing greater than described Second Threshold and less than described the 3rd threshold value.
4. exposal control method according to claim 3, is characterized in that, describedly judges that whether the first time for exposure also comprised greater than setting in advance after the step of the Second Threshold of this locality:
If the first time for exposure, less than Second Threshold, reduced the operating current of described infrared transmitting set to reduce infrared emitting intensity.
5. exposal control method according to claim 3, is characterized in that, described close described infrared transmitting set after, also comprise before obtaining the step of the first time for exposure:
Obtain the second time for exposure in shooting photometry process, wherein, described the second time for exposure is the current time for exposure under described infrared transmitting set closed condition;
Whether judge described the second time for exposure greater than the 4th threshold value that sets in advance in this locality, described the 4th threshold value is less than Second Threshold;
If the second time for exposure, greater than the 4th threshold value, sent the first control signal to described infrared transmitting set described infrared transmitting set is opened.
6. an exposure-control device, is characterized in that, comprising:
Electric current reduces module, is used for reducing the operating current of shooting photometry process infrared transmitting set;
The first time for exposure acquisition module, be used for obtaining the time for exposure changing value that reduces operating current and cause after electric current reduces unit minimizing operating current;
The first judge module, be used for judging that whether ratio between described time for exposure changing value and operating current minimizing value is less than first threshold;
Infrared closing module, be used for less than first threshold the time, closes described infrared transmitting set and continue shooting.
7. exposure-control device according to claim 6, is characterized in that, described device comprises:
The second time for exposure acquisition module: be used for obtaining the first time for exposure of shooting photometry process, wherein, described the first time for exposure is the current time for exposure under described infrared transmitting set opening;
The second judge module: be used for judging that whether described the first time for exposure is greater than the Second Threshold that sets in advance in this locality;
The 3rd judge module: be used for the second judge module draw the first time for exposure greater than Second Threshold after, whether judge described the first time for exposure greater than the 3rd threshold value that sets in advance in this locality, described the 3rd threshold value is greater than Second Threshold;
The first infrared adjusting module: be used in the first time for exposure during greater than the 3rd threshold value, increase the operating current of described infrared transmitting set to increase infrared emitting intensity, thereby reduce described the first time for exposure, make described the first time for exposure after minimizing greater than described Second Threshold and less than described the 3rd threshold value.
8. exposure-control device according to claim 7, is characterized in that, described device comprises:
The second infrared adjusting module: be used for judging for the first time for exposure during less than the Second Threshold that sets in advance in this locality when the second judge module, reduce the operating current of described infrared transmitting set with minimizing infrared emitting intensity.
9. exposure-control device according to claim 7, is characterized in that, described device also comprises:
The 3rd infrared adjusting module: be used for judging for the first time for exposure during less than the 3rd threshold value, the infrared emitting intensity of the described infrared transmitting set of maintenance when the 3rd judge module;
The 3rd time for exposure acquisition module: be used for obtaining the second time for exposure of shooting photometry process, wherein, described the second time for exposure is the current time for exposure under described infrared transmitting set closed condition;
The 4th judge module: judge that whether described the second time for exposure is greater than the 4th threshold value that sets in advance in this locality;
Infrared opening module: be used for, sending the first control signal to described infrared transmitting set described infrared transmitting set being opened during greater than the 4th threshold value in the second time for exposure.
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| CN2011102599485A CN102377947B (en) | 2011-09-02 | 2011-09-02 | Exposure control device and method |
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| CN105141856B (en) * | 2015-09-18 | 2018-08-10 | 联想(北京)有限公司 | A kind of illumination control method and device |
| CN113114951A (en) * | 2021-04-25 | 2021-07-13 | 北京华捷艾米科技有限公司 | Infrared exposure value adjusting method, system and equipment |
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| EP1486758A2 (en) * | 2003-06-09 | 2004-12-15 | Mitutoyo Corporation | Image measuring method and image measuring device |
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| CN101102416A (en) * | 2007-07-25 | 2008-01-09 | 北京中星微电子有限公司 | A method and device for automatic control of light supplementary light of shooting device |
| CN101140184A (en) * | 2007-10-30 | 2008-03-12 | 北京中星微电子有限公司 | Method and device for automatic measuring ambient brightness |
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| EP0996284A1 (en) * | 1998-10-23 | 2000-04-26 | Datalogic S.P.A. | Process for regulating the exposure time of a light sensor |
| EP1486758A2 (en) * | 2003-06-09 | 2004-12-15 | Mitutoyo Corporation | Image measuring method and image measuring device |
| CN1655041A (en) * | 2005-04-04 | 2005-08-17 | 北京中星微电子有限公司 | Exposure regulating method and device |
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