CN103973992A - Automatic exposure method and device for LED white-light source - Google Patents
Automatic exposure method and device for LED white-light source Download PDFInfo
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Abstract
The invention discloses an automatic exposure method for an LED white-light source. The method includes the steps that first, the brightness of a current video is acquired, and the difference value between the brightness of the current video and preset video brightness is calculated; second, whether the difference value is within a preset range is judged, and if not, the f-number and the shutter speed are adjusted according to the difference value so that automatic exposure can be performed; third, the first step and the second step are executed again, whether the f-number and the shutter speed are adjusted to preset threshold values is judged, if yes, the driving current and an automatic gain value of the LED white-light source are adjusted alternately till the next threshold value is achieved, automatic exposure is performed after the driving current or the automatic gain value of the LED white-light source is adjusted every time, and the third step is continued till the video ends. The invention further discloses an automatic exposure device for the LED white-light source. Due to the method and devoice, the control accuracy of automatic exposure is more accurate, and the quality effect of the video is effectively guaranteed.
Description
Technical field
The present invention relates to electronic imaging field, particularly relate to a kind of automatic explosion method for LED white light and device in electronic imaging field.
Background technology
2A algorithm is automatic exposure, Automatic white balance algorithm (Auto Exposure/Auto White Balance), is the necessary functions of front end digital imaging apparatus, and the quality of its realization directly affects the quality of imaging.
Automatic exposure, in order to according to extraneous light condition, is dynamically adjusted the folding of lens aperture, the speed of sensor devices electronic shutter, the yield value of digital processing unit, to realize the constant of luminance video, ensures good video dynamic range; Automatic white balance can correctly be reduced the color of external object under any colour temperature environment in order to guarantee equipment, natural colour temperature span is extremely wide, we can be low to moderate 1800K by common high-pressure sodium light path lamp color temperature, and the sunny blue sky colour temperature in overhead, waters can reach 27000K, Automatic white balance algorithm can be guaranteed the good color performance of imaging device in different-colour environment.
Because the sensor devices of front end imaging device exists limitation, in the time that illumination condition is bad, can not present good video effect, be mainly manifested in that noise increases, details resolution capability declines, dark space object cannot identification etc. problem, safety-security area addresses the above problem by the scheme that increases secondary light source at present.The secondary light source of current industry mainly contains two kinds, be infrared LED lamp and white LED lamp, both main distinctions are light wavelength difference, infrared LED lamp can only be used for black and white video, for not only needing good low photograph effect but also needing the occasion of color video also inapplicable, owing to there is heating and life problems, infrared LED lamp is endured to the fullest extent and is denounced always simultaneously.And white LED lamp is the novel green lighting of energy-conserving and environment-protective, it is a kind of visible ray, belong to cold light source, so can not generate heat and the life-span long, be widely used in the floor light of safety monitoring, because imaging device night is in the floor light situation of white light, the image of picked-up is colored, and can meet special applications is colored requirement for image always.
Because white LED lamp has its specific wavelength and light characteristics, and automatic gain is larger on video quality impact, in the time using secondary light source, by the accessed video quality poor effect of existing automatic explosion method.
Summary of the invention
Technical problem to be solved by this invention is: a kind of automatic explosion method for LED white light is provided, and the video that imaging device is obtained has best video effect.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is:
For an automatic explosion method for LED white light, comprise step:
S1, the brightness of obtaining current video, calculate the difference of current video brightness and default luminance video;
S2, judge that described difference is whether in preset range, if not, adjust aperture size according to described difference and shutter speed is carried out automatic exposure;
S3, repeating step S1 and S2, whether adjusted is to default threshold value to judge aperture size and shutter speed, if, multiple threshold values are set respectively for described automatic gain value and LED white light drive current, alternately adjust LED white light drive current and automatic gain value to next threshold value, after every adjustment LED white light drive current or automatic gain value, carry out automatic exposure, proceed step S3 until video finishes.
For solving the problems of the technologies described above, the present invention also discloses a kind of automatic exposure device for LED white light, and this device comprises:
For an automatic exposure device for LED white light, comprising: computing unit, the first judging unit, the first adjustment unit, the second judging unit, the second adjustment unit and cycling element;
Described computing unit is for the brightness of obtaining current video, calculates the difference of current video brightness and default luminance video;
Described the first judging unit is used for judging that described difference is whether in preset range, and described the first adjustment unit when being no when the judged result of the first judging unit, carries out automatic exposure according to described difference adjustment aperture size and shutter speed;
Whether adjusted is to default threshold value for judging aperture size and shutter speed for described the second judging unit, described the second adjustment unit is for when the judged result of described the second judging unit is when being, described automatic gain value and LED white light drive current are arranged respectively to multiple threshold values, alternately adjust LED white light drive current and automatic gain value to next threshold value, after every adjustment LED white light drive current or automatic gain value, carry out automatic exposure;
Described cycling element is used for above-mentioned the first judging unit of recursive call, the first adjustment unit, the second judging unit and the second adjustment unit until video finishes.
Beneficial effect of the present invention is: be different from prior art, only by adjusting aperture size, shutter speed and automatic gain value are carried out automatic exposure, the present invention includes LED white light drive current in automatic exposure and adjusts parameter area, optimize original automatic exposure algorithm, make the control precision of automatic exposure more accurate, simultaneously, preferential aperture size and the shutter speed adjusted in the time carrying out automatic exposure, thereby reduce the impact of automatic gain value on video quality most and reduced the power consumption of LED white light, further, the present invention is by adjusting automatic exposure value and LED white light drive current of replacing, the quality and the power consumption that has reduced imaging device of video are effectively ensured.
Brief description of the drawings
Fig. 1 is the method flow diagram of an embodiment of the present invention for the automatic explosion method of LED white light;
Fig. 2 is the functional block diagram of an embodiment of the present invention for the automatic exposure device of LED white light;
Fig. 3 is the workflow diagram of an embodiment of the present invention for the automatic exposure module of LED white light;
Main label declaration:
10-computing unit; 20-the first judging unit; 30-the first adjustment unit; 40-the second judging unit; 50-the second adjustment unit; 60-cycling element.
Embodiment
By describing technology contents of the present invention, structural feature in detail, being realized object and effect, below in conjunction with execution mode and coordinate accompanying drawing to be explained in detail.
The design of most critical of the present invention is: include LED white light drive current in automatic exposure and adjust parameter area, simultaneously, preferential aperture size and the shutter speed adjusted, and alternately adjust LED white light drive current and automatic gain value, effectively ensure the quality and the power consumption that has reduced imaging device of video.
Refer to Fig. 1, a kind of automatic explosion method for LED white light, comprises step:
S1, the brightness of obtaining current video, calculate the difference of current video brightness and default luminance video;
S2, judge that described difference is whether in preset range, if not, adjust aperture size according to described difference and shutter speed is carried out automatic exposure;
S3, repeating step S1 and S2, whether adjusted is to default threshold value to judge aperture size and shutter speed, if, multiple threshold values are set respectively for described automatic gain value and LED white light drive current, alternately adjust LED white light drive current and automatic gain value to next threshold value, after every adjustment LED white light drive current or automatic gain value, carry out automatic exposure, proceed step S3 until video finishes.
From foregoing description, beneficial effect of the present invention is: include LED white light drive current in automatic exposure and adjust parameter area, optimize original automatic exposure algorithm, make the control precision of automatic exposure more accurate, preferential adjustment aperture size and shutter speed are carried out automatic exposure, in the time that reaching default threshold value, aperture size and shutter speed just adjust automatic gain value and LED white light drive current, thereby reduce the impact of automatic gain value on video quality, meanwhile, also effectively reduce the power consumption of imaging device.Further, the present invention, by replace automatic exposure value and LED white light drive current are adjusted, has effectively ensured the quality and the power consumption that has reduced imaging device of video.
In step S2, in the time that current video brightness is less than default object brightness, adjust shutter speed slack-off, aperture size is become to large, contrary, in the time that current video brightness is greater than default object brightness, adjusts shutter speed and accelerate, aperture size is diminished.The adjustment span of described shutter speed and aperture size can be determined according to the size of described difference, in the time that described difference is larger, adjust described shutter speed and aperture size with larger span, when described difference hour, adjust described shutter speed and aperture size with less span.
Simultaneously, in the time adjusting aperture size and shutter speed and carry out automatic exposure, can be first to adjust shutter speed to carry out automatic exposure, after shutter speed is adjusted to the threshold value of setting, adjust again aperture and carry out greatly automatic exposure, also can be first to adjust aperture size to carry out automatic exposure, after aperture size is adjusted to the threshold value of setting, adjust again shutter speed and expose, or aperture size and shutter speed adjustment are exposed simultaneously.After being all adjusted to the threshold value of setting, shutter speed and aperture size carry out automatic exposure by adjusting automatic gain and LED white light drive current.
In the present embodiment, described automatic gain and LED white light drive current are respectively arranged with multiple refinement threshold values, alternately adjust LED white light drive current and automatic gain to next refinement threshold value, after every adjustment LED white light drive current or automatic gain, carry out automatic exposure.
The specific implementation of alternately adjusting LED white light drive current and automatic gain is: judge whether automatic gain value is less than the first gain threshold of setting, if, judge whether LED white light drive current is less than the first current threshold of setting, if LED white light drive current is less than the first current threshold of setting, adjust LED white light drive current to the second current threshold, if LED white light drive current is more than or equal to the first current threshold of setting, adjust automatic gain value to the second gain threshold, if automatic gain value is more than or equal to the first gain threshold of setting, described the first gain threshold is adjusted to the second gain threshold, the first current threshold is adjusted to the second current threshold, repeat above-mentioned steps, until automatic gain value reaches the max-thresholds of setting.
In the present embodiment, the speed of obtaining the brightness of current video in described step S3 is the brightness of every 3 frame video acquisition videos, calculate the difference of current video brightness and default luminance video, thereby guarantee is carried out real-time auto-exposure control to luminance video.
Because automatic gain is larger on video quality impact, when automatic gain exceedes certain threshold value and continues upper timing, the just obvious variation of the quality of video, meanwhile, one-side adjustment LED white light drive current may obviously increase the power consumption of imaging device.Therefore, by described automatic gain and LED white light drive current are respectively arranged with to multiple refinement threshold values, alternately adjust LED white light drive current and automatic gain to next refinement threshold value, automatic gain can effectively be reduced and LED white light drive current is excessive, thereby improve video quality effect, be reduced to picture equipment power dissipation.
In the above-described embodiment, the described specific implementation of alternately adjusting LED white light drive current and automatic gain can also be first to judge whether LED white light drive current is less than the first current threshold of setting, then judges whether automatic gain value is less than the first gain threshold of setting.Above-mentioned two kinds of orders of adjusting automatic gain value and LED white light drive current all can realize adjustment automatic gain value and LED white light drive current alternately, be that automatic gain value and LED white light drive current are adjusted in turn, thereby realize automatic gain value and LED white light drive current interlock adjustment, effectively prevent the too large video quality effect that affects of automatic gain value or LED white light drive current.
In the above-described embodiment, described step S3 also comprises:
Judge whether LED white light is to open for the first time, if so, open with minimum current threshold driving LED white light.Can prevent that by above-mentioned judgement LED white light from opening time, drive current is too large, the consumption that can effectively save the energy on the one hand, prevent on the other hand in the time that LED white light is opened, the LED white light of high brightness causes luminance video sudden change, has improved the dynamic stationarity of video automatic exposure.
In the above-described embodiment, can judge whether to open LED white light start-up time by external photosensitive hardware or software set.
Refer to Fig. 2, present embodiment also provides a kind of automatic exposure device for LED white light, and this automatic exposure device comprises: computing unit 10, the first judging unit 20, the first adjustment unit 30, the second judging unit 40, the second adjustment unit 50 and cycling element 60;
Described computing unit 10 is for obtaining the brightness of current video, calculates the difference of current video brightness and default luminance video;
Described the first judging unit 20 is for judging that described difference is whether in preset range, and described the first adjustment unit 30 when being no when the judged result of the first judging unit 20, is adjusted aperture size and shutter speed is carried out automatic exposure according to described difference;
Whether adjusted is to default threshold value for judging aperture size and shutter speed for described the second judging unit 40, described the second adjustment unit 50 is for when the judged result of described the second judging unit 40 is when being, described automatic gain value and LED white light drive current are arranged respectively to multiple threshold values, alternately adjust LED white light drive current and automatic gain value to next threshold value, after every adjustment LED white light drive current or automatic gain value, carry out automatic exposure;
Described cycling element 60 for above-mentioned the first judging unit 20 of recursive call, the first adjustment unit 30, the second judging unit 40 and the second adjustment unit 50 until video finish.
Wherein, described the second adjustment unit 50 comprises the first judge module, the second judge module, adjusting module and loop module;
Described the first judge module is for judging whether automatic gain value is less than the first gain threshold of setting;
Described the second judge module, for when the judged result of the first judge module is when being, judges whether LED white light drive current is less than the first current threshold of setting;
Described adjusting module, for when the judged result of the first judge module is while being no, is adjusted automatic gain value to the second gain threshold, when the judged result of described the second judge module is when being, and adjustment LED white light drive current to the second current threshold;
Described loop module is for the first judge module, the second judge module and adjusting module described in recursive call, until automatic gain value reaches the max-thresholds of setting.
Wherein, also comprise the 3rd judging unit, described the 3rd judging unit is used for judging whether LED white light is to open for the first time, if so, opens with minimum current threshold driving LED white light.
Wherein, also comprise the 4th judging unit, described the 4th judging unit is used for judging whether LED white light is opened, in the time that LED white light is not opened, carries out automatic exposure by adjusting aperture size and shutter speed and automatic gain.
This automatic exposure device for LED white light is included LED white light drive current in automatic exposure and is adjusted parameter area, optimize original automatic exposure algorithm, make the control precision of automatic exposure more accurate, preferential adjustment aperture size and shutter speed are carried out automatic exposure, in the time that reaching default threshold value, aperture size and shutter speed just adjust automatic gain value and LED white light drive current, thereby reduce the impact of automatic gain value on video quality, meanwhile, also effectively reduce the power consumption of imaging device.Further, the present invention, by replace automatic exposure value and LED white light drive current are adjusted, has effectively ensured the quality and the power consumption that has reduced imaging device of video.
In sum, automatic explosion method for LED white light provided by the invention and installation optimization original automatic exposure algorithm, make the control precision of automatic exposure more accurate, reduced the impact of automatic gain value on video quality, effectively reduce the power consumption of imaging device; And effectively ensure the quality of video; Improve the dynamic stationarity of video automatic exposure.
Example
Lift an object lesson below and further illustrate control procedure of the present invention:
Referring to Fig. 3, is the workflow diagram for the automatic exposure module of LED white light in an execution mode, and imaging device calls the automatic exposure module for LED white light every some frame of video.Described automatic exposure module judges whether LED white light is to open for the first time, and if so, LED white light drives and opens with lowest threshold, maintains the parameter constant of shutter speed, aperture size, automatic gain value, carries out automatic exposure;
If LED lamp is not to open for the first time, judge whether luminance video is more than or equal to default luminance video value, if so, carry out conventional automatic exposure processing module and carry out automatic exposure by adjusting aperture size, shutter speed and automatic gain; If not, judge whether shutter speed is less than the threshold value of setting;
If shutter speed is less than the threshold value of setting, adjust shutter speed slack-off, other parameters remain unchanged and carry out automatic exposure; If shutter speed is more than or equal to the threshold value of setting, judge whether aperture size is less than the threshold value of setting, if so, to adjust aperture and become large, other parameters remain unchanged and carry out automatic exposure, until aperture size is adjusted to the threshold value of setting;
In the time that shutter speed and aperture size are all more than or equal to the threshold value of setting, judge whether automatic gain value is less than the first gain threshold of setting, if, judge whether LED white light drive current is less than the first current threshold of setting, if LED white light drive current is less than the first current threshold of setting, adjust LED white light drive current to the second current threshold, other parameters remain unchanged and carry out automatic exposure, if LED white light drive current is more than or equal to the first current threshold of setting, adjust automatic gain value to the second gain threshold, other parameters remain unchanged and carry out automatic exposure, if automatic gain value is more than or equal to the first gain threshold of setting, described the first gain threshold is adjusted to the second gain threshold, the first current threshold is adjusted to the second current threshold, repeat above-mentioned steps, until automatic gain value reaches the max-thresholds of setting.
The foregoing is only embodiments of the invention; not thereby limit the scope of the claims of the present invention; every equivalent structure or conversion of equivalent flow process that utilizes specification of the present invention and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
Claims (8)
1. for an automatic explosion method for LED white light, it is characterized in that, comprise step:
S1, the brightness of obtaining current video, calculate the difference of current video brightness and default luminance video;
S2, judge that described difference is whether in preset range, if not, adjust aperture size according to described difference and shutter speed is carried out automatic exposure;
S3, repeating step S1 and S2, whether adjusted is to default threshold value to judge aperture size and shutter speed, if, multiple threshold values are set respectively for described automatic gain value and LED white light drive current, alternately adjust LED white light drive current and automatic gain value to next threshold value, after every adjustment LED white light drive current or automatic gain value, carry out automatic exposure, proceed step S3 until video finishes.
2. the automatic explosion method for LED white light according to claim 1, is characterized in that, " alternately adjusts LED white light drive current and automatic gain value to next threshold value " and comprise step described in step S3:
Judge whether automatic gain value is less than the first gain threshold of setting, if, judge whether LED white light drive current is less than the first current threshold of setting, if LED white light drive current is less than the first current threshold of setting, adjust LED white light drive current to the second current threshold, if LED white light drive current is more than or equal to the first current threshold of setting, adjust automatic gain value to the second gain threshold
If automatic gain value is more than or equal to the first gain threshold of setting, described the first gain threshold is adjusted to the second gain threshold, the first current threshold is adjusted to the second current threshold, repeats above-mentioned steps, until automatic gain value reaches the max-thresholds of setting.
3. the automatic explosion method for LED white light according to claim 2, is characterized in that, described step S3 also comprises:
Judge whether LED white light is to open for the first time, if so, open with minimum current threshold driving LED white light.
4. the automatic explosion method for LED white light according to claim 1, it is characterized in that, before step S1, also comprise: judge whether LED white light is opened, in the time that LED white light is not opened, carry out automatic exposure by adjusting aperture size and shutter speed and automatic gain.
5. for an automatic exposure device for LED white light, it is characterized in that, comprising: computing unit, the first judging unit, the first adjustment unit, the second judging unit, the second adjustment unit and cycling element;
Described computing unit is for the brightness of obtaining current video, calculates the difference of current video brightness and default luminance video;
Described the first judging unit is used for judging that described difference is whether in preset range, and described the first adjustment unit when being no when the judged result of the first judging unit, carries out automatic exposure according to described difference adjustment aperture size and shutter speed;
Whether adjusted is to default threshold value for judging aperture size and shutter speed for described the second judging unit, described the second adjustment unit is for when the judged result of described the second judging unit is when being, described automatic gain value and LED white light drive current are arranged respectively to multiple threshold values, alternately adjust LED white light drive current and automatic gain value to next threshold value, after every adjustment LED white light drive current or automatic gain value, carry out automatic exposure;
Described cycling element is used for above-mentioned the first judging unit of recursive call, the first adjustment unit, the second judging unit and the second adjustment unit until video finishes.
6. the automatic exposure device for LED white light according to claim 5, is characterized in that, described the second adjustment unit comprises the first judge module, the second judge module, adjusting module and loop module;
Described the first judge module is for judging whether automatic gain value is less than the first gain threshold of setting;
Described the second judge module, for when the judged result of the first judge module is when being, judges whether LED white light drive current is less than the first current threshold of setting;
Described adjusting module, for when the judged result of the first judge module is while being no, is adjusted automatic gain value to the second gain threshold, when the judged result of described the second judge module is when being, and adjustment LED white light drive current to the second current threshold;
Described loop module is for the first judge module, the second judge module and adjusting module described in recursive call, until automatic gain value reaches the max-thresholds of setting.
7. the automatic exposure device for LED white light according to claim 6, it is characterized in that, also comprise the 3rd judging unit, described the 3rd judging unit is used for judging whether LED white light is to open for the first time, if so, open with minimum current threshold driving LED white light.
8. the automatic exposure device for LED white light according to claim 5, it is characterized in that, also comprise the 4th judging unit, described the 4th judging unit is used for judging whether LED white light is opened, in the time that LED white light is not opened, carry out automatic exposure by adjusting aperture size and shutter speed and automatic gain.
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| CN201410216285.2A CN103973992B (en) | 2014-05-21 | 2014-05-21 | A kind of automatic explosion method and device for LED white lights |
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