CN102368809B - Exposure compensation device, method and infrared camera - Google Patents
Exposure compensation device, method and infrared camera Download PDFInfo
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- CN102368809B CN102368809B CN 201110258789 CN201110258789A CN102368809B CN 102368809 B CN102368809 B CN 102368809B CN 201110258789 CN201110258789 CN 201110258789 CN 201110258789 A CN201110258789 A CN 201110258789A CN 102368809 B CN102368809 B CN 102368809B
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Abstract
The invention discloses an exposure compensation device, a method, and an infrared camera. The method comprises the following steps: the whole shooting area picture is divided into a plurality of small blocks; the brightness value and the brightness change value of each small block when an infrared transmitting device is started are recorded; if the brightness value of a certain small block is larger than a first threshold and the brightness change value of the small block is larger than a second threshold, the infrared ray transmitting strength of the infrared transmitting device is reduced;and if the brightness value of a certain small block is smaller than a third threshold and the brightness change value of the small block is larger than a fourth threshold, the infrared ray transmitting strength of the infrared transmitting device is enhanced. According to the invention, the picture is divided, whether an exposure compensation value is within a preset range is judged according tothe brightness value and the brightness change value of the divided small blocks of pictures, and the optimum exposure compensation value can be obtained precisely according to the real-time change of an external light environment, so the camera can obtain clear and stable images of target objects when working under various light conditions.
Description
Technical field
The present invention relates to the camera technique field, relate in particular to a kind of exposure compensating apparatus and method and thermal camera.
Background technology
Video camera is when imaging, and the control of the power of exposure light is extremely important, and exposure parameter is generally controlled by time for exposure and aperture size.Time for exposure and the exposure light relation of being inversely proportional to, exposure light is more strong, so the time for exposure just more short, otherwise exposure light is more weak, the time for exposure just needs more long.And the power of the size of aperture and the exposure light relation of being inversely proportional to, exposure light is more strong, and it is more little then to control aperture, on the contrary exposure light is more weak, and it is more big then to control aperture.
Operate as normal, especially night also can operate as normal under darker environment in order to realize video camera, only obviously can not deal with problems by control time for exposure and aperture size, 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 the defective that traditional cameras can not normal imaging in night or darker environment, the video camera of this band 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 exposure compensation of digital picture is disclosed, this method is to calculate the initial edge energy value by the pixel brightness value in the digital picture of initial exposure value, and obtain a maximal margin energy value by changing exposure bias value, exposure bias value corresponding to described maximal margin energy value is the optimum exposure offset, if the numerical value that the difference of described maximal margin energy value and described initial edge energy value greater than a threshold value, then compensates described initial exposure value behind the described optimum exposure exposure bias value compensates as present exposure value; Otherwise, then directly compensate as present exposure value with described initial exposure value.
Though above-mentioned patent is improved traditional exposure compensation, but the brightness value of pixel is sought an optimum exposure offset in the digital picture of its judgment basis initial exposure value, and not the making a response fast with the real-time change of extraneous light environment of this optimum exposure offset, therefore, the optimum exposure offset that only obtains according to the brightness value of the Pixel of Digital Image of initial exposure value is inaccurate.
Summary of the invention
The technical problem that the present invention mainly solves provides a kind of exposure compensating apparatus and method and thermal camera, can obtain an optimum exposure offset according to the real-time change of extraneous light environment exactly, thereby can make under multiple light condition that video camera all can obtain the steady and audible image of object.
For solving the problems of the technologies described above, the technical scheme that the present invention adopts is: a kind of exposure compensation is provided, may further comprise the steps:
The whole district's picture that is taken is divided into some fritters;
The brightness value of each fritter when infrared transmitting set opened in record and the changing value of each little Block Brightness;
If the brightness value of a certain fritter greater than second threshold value, then reduces the infrared ray emissive porwer of infrared transmitting set greater than the brightness changing value of first threshold and this fritter; If the brightness value of a certain fritter greater than the 4th threshold value, then increases the infrared ray emissive porwer of infrared transmitting set less than the brightness changing value of the 3rd threshold value and this fritter.
Wherein, before the step of the brightness value of each fritter when infrared transmitting set opened in record and the changing value of each little Block Brightness, also comprise the brightness value that obtains whole shooting picture, when the brightness value of described whole shooting picture is lower than the 5th threshold value, open infrared transmitting set.
Wherein, in the step of the infrared ray emissive porwer that reduces infrared transmitting set, the infrared ray emissive porwer of described minimizing infrared transmitting set is to regulate by the pulse duration that reduces the control drive current.
Wherein, in the step of the infrared ray emissive porwer that increases infrared transmitting set, the infrared ray emissive porwer of described increase infrared transmitting set is to regulate by the pulse duration that increases the control drive current.
For solving the problems of the technologies described above, another technical solution used in the present invention is: a kind of exposure compensating device is provided, comprises: the picture segmentation module: be used for the whole district's picture that is taken is divided into some fritters; Brightness logging modle: the brightness value of each fritter when being used for record unlatching infrared transmitting set and the changing value of each little Block Brightness; The first infrared adjusting module: if the brightness value of a certain fritter greater than the brightness changing value of first threshold and this fritter greater than second threshold value, then reduce the infrared ray emissive porwer of infrared transmitting set; If the brightness value of a certain fritter greater than the 4th threshold value, then increases the infrared ray emissive porwer of infrared transmitting set less than the brightness changing value of the 3rd threshold value and this fritter.
Wherein, described device also comprises the second infrared adjusting module: the described second infrared adjusting module is used for obtaining the brightness value of whole shooting picture, opens infrared transmitting set when the brightness value of described whole shooting picture is lower than the 5th threshold value.
Wherein, described device also comprises the pulse width modulation module, described pulse width modulation module is used for driving described infrared transmitting set, and increase the infrared ray emissive porwer of infrared transmitting set by the pulse duration that increases the control drive current, and reduce the infrared ray emissive porwer of infrared transmitting set by the pulse duration that reduces the control drive current.
For solving the problems of the technologies described above, another technical solution used in the present invention is: a kind of thermal camera is provided, comprises above-mentioned exposure compensating device.
The invention has the beneficial effects as follows: only be different from the defective that optimum exposure offset that the brightness value according to the Pixel of Digital Image of initial exposure value obtains is inaccurate, the present invention is by cutting apart picture, and judge that according to the brightness value of the fritter picture after cutting apart and brightness changing value exposure bias value is whether in preset range, such optimum exposure offset is to obtain exactly according to the real-time change of extraneous light environment, thereby can all can obtain the steady and audible image of object so that video camera is operated under the multiple light condition.
Description of drawings
Fig. 1 is the flow chart of steps of exposure compensation embodiment of the present invention;
Fig. 2 is the structural representation of exposure compensating device first embodiment of the present invention;
Fig. 3 is the structural representation of exposure compensating device second embodiment of the present invention.
Embodiment
The present invention is described in detail below in conjunction with drawings and Examples.
See also Fig. 1, exposure compensation embodiment of the present invention may further comprise the steps:
Step 101: the whole district's picture that is taken is divided into some fritters;
Step 102: the brightness value of each fritter when infrared transmitting set opened in record and the changing value of each little Block Brightness;
Step 103: if the brightness value of a certain fritter greater than the brightness changing value of first threshold and this fritter greater than second threshold value, then reduce the infrared ray emissive porwer of infrared transmitting set; If the brightness value of a certain fritter greater than the 4th threshold value, then increases the infrared ray emissive porwer of infrared transmitting set less than the brightness changing value of the 3rd threshold value and this fritter.
The district that is taken at target object place is divided with brightness and brightness changing value and carries out record, can judge respectively the light of each fritter, to improve judgement precision and the accuracy of light luminance.When the brightness value of a certain fritter, is thought that light causes overexposure too strongly, and needed to reduce the infrared compensation light of infrared transmitting set emission, to reduce exposure region required exposure light during greater than second threshold value greater than the brightness changing value of first threshold and this fritter.When if the brightness value of a certain fritter less than the brightness changing value of the 3rd threshold value and this fritter during greater than the 4th threshold value, it is dark to think that light too secretly caused, and needs to increase the infrared compensation light of infrared transmitting set emission, to improve exposure region required exposure light.First threshold and the 3rd threshold value are brightness values, and second threshold value and the 4th threshold value are the brightness changing values.
More than can understand, only be different from the defective that optimum exposure offset that the brightness value according to the Pixel of Digital Image of initial exposure value obtains is inaccurate, the present invention is by cutting apart picture, and judge that according to the brightness value of the fritter picture after cutting apart and brightness changing value exposure bias value is whether in preset range, such optimum exposure offset is to obtain exactly according to the real-time change of extraneous light environment, thereby can all can obtain the steady and audible image of object so that video camera is operated under the multiple light condition.
Before the step of the brightness value of each fritter when infrared transmitting set opened in record and the changing value of each little Block Brightness, also comprise the brightness value that obtains whole shooting picture, when the brightness value of described whole shooting picture is lower than the 5th threshold value, open infrared transmitting set.By judging the overall brightness value of shooting picture, to judge whether natural environment light enough reaches optimum exposure, if it is not enough, then show needs unlatching infrared transmitting set, utilize infrared ray that light is compensated, obtain an optimum exposure offset exactly with the real-time change according to extraneous light environment, thereby make video camera be operated under the multiple light condition, all can obtain the steady and audible image of object.
In another embodiment, in the step of the infrared ray emissive porwer that reduces infrared transmitting set, the infrared ray emissive porwer that reduces infrared transmitting set is to regulate by the pulse duration that reduces the control drive current.In the step of the infrared ray emissive porwer that increases infrared transmitting set, the infrared ray emissive porwer that increases infrared transmitting set is to regulate by the pulse duration that increases the control drive current.Certainly, can be by the pulse duration size of regulating drive current of control drive current, also can change the infrared emittance of infrared transmitting set by other the mode of change current value.
The present invention is divided into some to the whole image in the district that is taken, and records each Block Brightness, Y1............Yn.In the infrared lamp change procedure, the brightness of recording this piece changes Δ Y1...... Δ Yn, piece overexposure family of power and influence THRy0, THRdy0, piece cross hidden door valve THRy1, THRdy1, in infrared increase process, if a certain Yx＞THRy0 and Δ Yx＞Δ THRdy0, then think the infrared overexposure that causes.In infrared minimizing process, if a certain Yx＜THRy1 and Δ Yx＞Δ THRdy1, then think infrared caused dark.
See also Fig. 2, first embodiment of exposure compensating device of the present invention comprises:
Picture segmentation module 201: be used for the whole district's picture that is taken is divided into some fritters;
Brightness logging modle 202: the brightness value of each fritter when being used for record unlatching infrared transmitting set and the changing value of each little Block Brightness;
The first infrared adjusting module 203: if the brightness value of a certain fritter greater than the brightness changing value of first threshold and this fritter greater than second threshold value, then reduce the infrared ray emissive porwer of infrared transmitting set; If the brightness value of a certain fritter greater than the 4th threshold value, then increases the infrared ray emissive porwer of infrared transmitting set less than the brightness changing value of the 3rd threshold value and this fritter.
More than can understand, only be different from the defective that optimum exposure offset that the brightness value according to the Pixel of Digital Image of initial exposure value obtains is inaccurate, the present invention is cut apart picture by picture segmentation module 201, and the brightness value of each fritter when opening infrared transmitting sets by brightness logging modle 202 record and the changing value of each little Block Brightness, the first infrared adjusting module 203 judges that according to the brightness value of the fritter picture after cutting apart and brightness changing value exposure bias value is whether in preset range, such optimum exposure offset is to obtain exactly according to the real-time change of extraneous light environment, thereby can all can obtain the steady and audible image of object so that video camera is operated under the multiple light condition.
See also Fig. 3, second embodiment of exposure compensating device of the present invention comprises:
Picture segmentation module 301: be used for the whole district's picture that is taken is divided into some fritters;
Brightness logging modle 302: the brightness value of each fritter when being used for record unlatching infrared transmitting set and the changing value of each little Block Brightness;
The first infrared adjusting module 303: if the brightness value of a certain fritter greater than the brightness changing value of first threshold and this fritter greater than second threshold value, then reduce the infrared ray emissive porwer of infrared transmitting set; If the brightness value of a certain fritter greater than the 4th threshold value, then increases the infrared ray emissive porwer of infrared transmitting set less than the brightness changing value of the 3rd threshold value and this fritter;
The second infrared adjusting module 304: be used for obtaining the brightness value of whole shooting picture, when the brightness value of whole shooting picture is lower than the 5th threshold value, open infrared transmitting set.
More than can understand, only be different from the defective that optimum exposure offset that the brightness value according to the Pixel of Digital Image of initial exposure value obtains is inaccurate, the present invention is cut apart picture by picture segmentation module 301, and the brightness value of each fritter when opening infrared transmitting sets by brightness logging modle 302 record and the changing value of each little Block Brightness, the first infrared adjusting module 303 judges that according to the brightness value of the fritter picture after cutting apart and brightness changing value exposure bias value is whether in preset range, the second infrared adjusting module 304 also is used for judging whether need to open infrared equipment, by the first infrared adjusting module 303 and second infrared adjusting module 304 mating reactions, the optimum exposure offset that obtains is to obtain exactly according to the real-time change of extraneous light environment, thereby can all can obtain the steady and audible image of object so that video camera is operated under the multiple light condition.
In another embodiment, the exposure compensating device also comprises the pulse width modulation module, the pulse width modulation module is used for driving described infrared transmitting set, and increase the infrared ray emissive porwer of infrared transmitting set by the pulse duration that increases the control drive current, and reduce the infrared ray emissive porwer of infrared transmitting set by the pulse duration that reduces the control drive current.
The thermal camera of the embodiment of the invention comprises and uses above-mentioned exposure compensating device.
The above only is embodiments of the invention; be not so limit claim of the present invention; every equivalent structure or equivalent flow process conversion that utilizes specification of the present invention and accompanying drawing content to do; or directly or indirectly be used in other relevant technical fields, all in like manner be included in the scope of patent protection of the present invention.
Claims (8)
1. an exposure compensation is characterized in that, may further comprise the steps:
The whole district's picture that is taken is divided into some fritters;
The brightness value of each fritter when infrared transmitting set opened in record and the changing value of each little Block Brightness;
If the brightness value of a certain fritter greater than second threshold value, then reduces the infrared ray emissive porwer of infrared transmitting set greater than the brightness changing value of first threshold and this fritter; If the brightness value of a certain fritter greater than the 4th threshold value, then increases the infrared ray emissive porwer of infrared transmitting set less than the brightness changing value of the 3rd threshold value and this fritter.
2. method according to claim 1 is characterized in that:
Before the step of the brightness value of each fritter when infrared transmitting set opened in record and the changing value of each little Block Brightness, also comprise the brightness value that obtains whole shooting picture, when the brightness value of described whole shooting picture is lower than the 5th threshold value, open infrared transmitting set.
3. method according to claim 1 is characterized in that:
In the step of the infrared ray emissive porwer that reduces infrared transmitting set, the infrared ray emissive porwer of described minimizing infrared transmitting set is to regulate by the pulse duration that reduces the control drive current.
4. method according to claim 1 is characterized in that:
In the step of the infrared ray emissive porwer that increases infrared transmitting set, the infrared ray emissive porwer of described increase infrared transmitting set is to regulate by the pulse duration that increases the control drive current.
5. an exposure compensating device is characterized in that, comprising:
Picture segmentation module: be used for the whole district's picture that is taken is divided into some fritters;
Brightness logging modle: the brightness value of each fritter when being used for record unlatching infrared transmitting set and the changing value of each little Block Brightness;
The first infrared adjusting module: if the brightness value of a certain fritter greater than the brightness changing value of first threshold and this fritter greater than second threshold value, then reduce the infrared ray emissive porwer of infrared transmitting set; If the brightness value of a certain fritter greater than the 4th threshold value, then increases the infrared ray emissive porwer of infrared transmitting set less than the brightness changing value of the 3rd threshold value and this fritter.
6. device according to claim 5 is characterized in that:
Described device also comprises the second infrared adjusting module: the described second infrared adjusting module is used for obtaining the brightness value of whole shooting picture, opens infrared transmitting set when the brightness value of described whole shooting picture is lower than the 5th threshold value.
7. device according to claim 5 is characterized in that:
Described device also comprises the pulse width modulation module, described pulse width modulation module is used for driving described infrared transmitting set, and increase the infrared ray emissive porwer of infrared transmitting set by the pulse duration that increases the control drive current, and reduce the infrared ray emissive porwer of infrared transmitting set by the pulse duration that reduces the control drive current.
8. a thermal camera is characterized in that, comprises as each described exposure compensating device of claim 5～7.
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| EP3094081A4 (en) * | 2014-01-10 | 2017-06-07 | Hangzhou Hikvision Digital Technology Co., Ltd. | Infrared camera and infrared lamp brightness adjustment method therefor |
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| CN103595916A (en) * | 2013-11-11 | 2014-02-19 | 南京邮电大学 | Double-camera target tracking system and implementation method thereof |
| CN104202537B (en) * | 2014-09-05 | 2019-03-01 | 天彩电子（深圳）有限公司 | A kind of light-dimming method of thermal camera |
| CN106817825A (en) * | 2016-12-22 | 2017-06-09 | 济南中维世纪科技有限公司 | A kind of video monitoring intelligent Light-control System and method |
| CN107147853A (en) * | 2017-04-28 | 2017-09-08 | 济南中维世纪科技有限公司 | A kind of video monitoring intelligent infrared regulating system and method |
| CN107370966B (en) * | 2017-08-24 | 2018-05-04 | 珠海安联锐视科技股份有限公司 | A kind of intelligent infrared control circuit and its control method |
| CN109981971B (en) * | 2017-12-28 | 2022-03-11 | 浙江宇视科技有限公司 | Flashlight effect eliminating method and device |
| WO2020019266A1 (en) * | 2018-07-26 | 2020-01-30 | 华为技术有限公司 | Image processing method and device |
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| CN101893723B (en) * | 2009-06-30 | 2012-11-07 | 上海科勒电子科技有限公司 | Automatic induction method |
| CN101872106B (en) * | 2010-05-21 | 2012-07-11 | 深圳市艾威视数码科技有限公司 | Intelligent infrared camera and intelligent infrared light intensity adjustment method thereof |
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