CN1696811A - Method for determining indoor illumination environment being as 50Hz or 60Hz - Google Patents
Method for determining indoor illumination environment being as 50Hz or 60Hz Download PDFInfo
- Publication number
- CN1696811A CN1696811A CN200410037825.7A CN200410037825A CN1696811A CN 1696811 A CN1696811 A CN 1696811A CN 200410037825 A CN200410037825 A CN 200410037825A CN 1696811 A CN1696811 A CN 1696811A
- Authority
- CN
- China
- Prior art keywords
- value
- photoenvironment
- time shutter
- exposure
- continuous frames
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000005286 illumination Methods 0.000 title claims description 10
- 238000005516 engineering process Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 238000007687 exposure technique Methods 0.000 description 1
Images
Landscapes
- Photometry And Measurement Of Optical Pulse Characteristics (AREA)
Abstract
A method for determining that light environment is 50 H2 or 60H2 in the room includes adjusting exposure time, selecting out set exposure time which is most close to adjusted time and using it as exposure time for system, calculating brightness D - value D1 of adjacent two images out in set exposure time; utilizing set exposure time in another group and using the same method to obtain brightness D - value D2 of two adjacent images; confirming that current light environment is 50 H2 if D1 is less that D2 and it is 60 H2 if D1 is greater than D2 or returning back to start if D is equal to D2.
Description
Technical field
The present invention relates to the exposure technique field of sensor devices, specifically, relate to a kind of method of auxiliary elimination sensor devices flashing under line exposure mode phenomenon.
Background technology
Usually our power supply that uses all is AC power, and this just causes the luminous intensity of the used light of room lighting and body surface receives under this illuminating lamp lighting environment illuminance is not constant.Because generally can there be scintillation in the influence of this factor in doing the process of automatic exposure.In number of patent application is 200310116978.6 technology, a kind of method of eliminating sensor devices flashing under line exposure mode phenomenon has been described, to solve the flicker problem that exists in the sensor devices output.This is invented in the described method, if illuminating lamp is the light source under the driving of 50Hz alternating current, the described contrast time shutter is 1/100 second a integral multiple; If illuminating lamp is under the light source under the driving of 60Hz alternating current, the described contrast time shutter is 1/120 second a integral multiple.But it is 50Hz or the method for 60Hz that the current ac frequency of a kind of automatic judgement is not provided in this invention.So need to adopt default setting, or to adopt the manual mode that is provided with to tell system current be 50Hz or 60Hz on earth.For the situation of default setting, if the user travels to a new country, serious flicker problem will appear in exposure.
Summary of the invention
The objective of the invention is for a kind of method of differentiating indoor 50Hz or 60Hz photoenvironment is provided, can assist and eliminate sensor devices flashing under line exposure mode phenomenon.
For achieving the above object, it is as follows to the invention provides scheme:
A kind of method of differentiating indoor 50Hz or 60Hz photoenvironment, comprise step: (1) utilizes automatic exposure control procedure unit, according to brightness of illumination at that time, the time shutter is automatically adjusted; (2) from one group of exposure value that configures in advance, choose and a middle the most approaching time shutter of net result of step (1), and this exposure time values is set at the new time shutter of total system; (3) under the time shutter that step (2) is set, calculate the difference D1 of the brightness value between two continuous frames image respective pixel; (4) from the exposure value that another group configures in advance, choose and a middle the most approaching time shutter of net result of step (1), and this exposure time values is set at the new time shutter of total system; (5) under the time shutter that step (4) is set, calculate the difference D2 of the brightness value between two continuous frames image respective pixel; (6) if D1＜D2, then when the used alternating current of front lit be 50Hz; If D1＞D2, then working as the used alternating current of front lit is 60Hz; If D1=D2 then gets back to step (2) and recomputates.
Above-mentioned steps 2) exposure value that this group of mentioning in configures in advance comprises { 2/100,3/100,7/100,8/100,12/100,13/100,17/100,18/100,22/100,23/100,27/100,28/100,32/100,33/100,37/100,38/100}, unit is second.
Above-mentioned steps 2), the exposure value that configures in advance of this group of mentioning in the step 4) comprise 3/120,9/120,15/120,21/120,27/120,33/120,39/120,45/120}, unit be second.
In above-mentioned steps 3) and step 5) in when calculating the luminance difference of respective pixel value of two continuous frames image, can calculate all pixels in the view picture image, also can get the partial pixel value and calculate.
In above-mentioned steps 3) and step 5) in when calculating the luminance difference of respective pixel value of two continuous frames image, can calculate once, also can calculate repeatedly averaged or maximum, minimum value.
Compared with prior art, the invention has the advantages that: in the automatic exposure process, do not need to adopt default setting, or to adopt the manual mode that is provided with to tell system current be 50Hz or 60Hz on earth, just can judge current photoenvironment automatically, so just can assist and eliminate sensor devices flashing under line exposure mode phenomenon.
Description of drawings
Fig. 1 is the process flow diagram of the method for the invention;
Fig. 2 is a photoenvironment when being 50Hz, the graph of relation of brightness value difference (absolute value) f (t) of time shutter t and pixel;
Fig. 3 is a photoenvironment when being 60Hz, the graph of relation of brightness value difference (absolute value) f (t) of time shutter t and pixel.
Embodiment
With reference to Fig. 1, a kind of method of differentiating indoor 50Hz or 60Hz photoenvironment comprises step: 1) utilize automatic exposure control procedure unit, according to brightness of illumination at that time, the time shutter is automatically adjusted; 2) from one group of exposure value that configures in advance, choose with step 1) in a most approaching time shutter of net result, and this exposure time values is set at new time shutter of total system; 3) in step 2) under time shutter of setting, calculate the difference D1 of the brightness value between two continuous frames image respective pixel; 4) from another exposure value of configuring in advance of group, choose with step 1) in a most approaching time shutter of net result, and this exposure time values is set at new time shutter of total system; 5) under the time shutter that step 4) is set, calculate the difference D2 of the brightness value between two continuous frames image respective pixel; 6) if D1＜D2, then when the used alternating current of front lit be 50Hz; If D1＞D2, then working as the used alternating current of front lit is 60Hz; If D1=D2 then gets back to step 2) recomputate.
Above-mentioned steps 2) exposure value that this group of mentioning in configures in advance comprises { 2/100,3/100,7/100,8/100,12/100,13/100,17/100,18/100,22/100,23/100,27/100,28/100,32/100,33/100,37/100,38/100}, unit is second.
Above-mentioned steps 2), the exposure value that configures in advance of this group of mentioning in the step 4) comprise 3/120,9/120,15/120,21/120,27/120,33/120,39/120,45/120}, unit be second.
In above-mentioned steps 3) and step 5) in when calculating the luminance difference of respective pixel value of two continuous frames image, can calculate all pixels in the view picture image, also can get the partial pixel value and calculate.
In above-mentioned steps 3) and step 5) in when calculating the luminance difference of respective pixel value of two continuous frames image, can calculate once, also can calculate repeatedly averaged or maximum, minimum value.
Here we to establish the time shutter that is provided with in the current sensor devices be t=k
1* T
1+ d
1=k
2* T
2+ d
2, wherein, make T
1=1/100, T
2=1/120, k
1, k
2Be 0,1,2 ... Deng integer, d
1∈ [T
1/ 2, T
1/ 2], d
2∈ [T
2/ 2, T
2/ 2].Obviously, we know under the room lighting condition of 50Hz alternating current, if d
1Be tending towards 0, then do not have scintillation substantially.In like manner, under the room lighting condition of 60Hz alternating current, if d
2Be tending towards 0, also can not have scintillation substantially.If because the brightness value difference (absolute value) of each corresponding pixel points that phase differential caused is bigger, say from whole structure that then scintillation will be apparent in view between the two continuous frames image.We can describe the brightness value difference (absolute value) of corresponding pixel points between the two continuous frames image and the relation between the time shutter t with f (t).
For the ease of differentiating current lighting source is 50Hz or 60Hz, needs to select some time shutter t targetedly, causes brightness value difference (absolute value) f (t) of corresponding pixel points between the two continuous frames image bigger or smaller artificially.We can be provided with two different time shutter t
1, t
2, satisfy following two conditions simultaneously:
(1) when illumination condition is 50Hz, f (t
1) minimum or as far as possible little, f (t
2) maximum or big as far as possible;
(2) when illumination condition is 60Hz, f (t
1) maximum or big as far as possible, f (t
2) minimum or as far as possible little;
At first, find out the t that satisfies condition
1:
In condition (1), in order to allow f (t
1) minimum, then should make d
1=0, i.e. t
1Should be T
1Integral multiple.In condition (2), in order to allow f (t
1) big as far as possible, then should make phase differential | d
2| big as far as possible.From accompanying drawing 2 as can be seen, t
1Get 2T
1Or 3T
1The time, phase differential | d
2| reach maximum, be 0.4T
2Learn t according to the periodicity principle
1Get (2+5*m
1) T
1Or (3+5*m
1) T
1All satisfy condition.
Then, in like manner, find out the t that satisfies condition
2:
In condition (2), in order to allow f (t
2) minimum, then should make d
2=0, i.e. t
2Should be T
2Integral multiple.In condition (1), in order to allow f (t
2) big as far as possible, then should make phase differential | d
1| big as far as possible.From accompanying drawing 3 as can be seen, t
2Get 3T
2The time, phase differential | d
1| reach maximum, be 0.5T
1Learn t according to the periodicity principle
2Get (3+6*m
2) T
2All satisfy condition.
To sum up, I, can the time shutter be set to (2+5*m
1)/100, or (3+5*m
1)/100, wherein m
1Can take the circumstances into consideration to select 0,1,2 according to lighting condition at that time ... Deng integer;
II, under this time shutter, calculate the difference Diff1 of the brightness value between two continuous frames image respective pixel;
III, time shutter are set to (3+6*m
2)/120, wherein m
2Can take the circumstances into consideration to select 0,1,2 according to lighting condition at that time ... Deng integer;
IV, under this time shutter, calculate the difference Diff2 of the brightness value between two continuous frames image respective pixel;
If V is Diff1＜Diff2, then working as the used alternating current of front lit is 50Hz;
If Diff1＞Diff2, then working as the used alternating current of front lit is 60Hz;
If Diff1=Diff2 then gets back to I and recomputates;
Under certain illumination condition, the exposure time values that the automatic exposure control module provides is 0.023 second.In step 2) in, should choose immediate value is 2/100=0.02 second.By this exposure value, the luminance difference that calculates the two continuous frames image is (getting three times) 6542,7014,6832, and it is 6796 that this value of three times is averaged.In step 4), should choose immediate value is 3/120=0.025 second.By this exposure value, the luminance difference that calculates the two continuous frames image is (getting three times) 25442,27832,23562, and it is 25612 that this value of three times is averaged.Since 6796＜25612, be 50Hz so judge current illumination condition.
Under certain illumination condition, the exposure time values that the automatic exposure control module provides is 0.033 second.In step 2) in, should choose immediate value is 3/100=0.03 second.By this exposure value, the luminance difference that calculates the two continuous frames image is (getting three times) 32367,32434,36522, and it is 33774 that this value of three times is averaged.In step 4), should choose immediate value is 3/120=0.025 second.By this exposure value, the luminance difference that calculates the two continuous frames image is (getting three times) 4225,6521,4982, and it is 5243 that this value of three times is averaged.Since 33774＞5243, be 60Hz so judge current illumination condition.
A kind of method of differentiating indoor 50Hz or 60Hz photoenvironment of the present invention, be not restricted to listed utilization in instructions and the embodiment, it can be applied to various suitable the present invention's field fully, for those skilled in the art, can easily realize additional advantage and make amendment, therefore under the situation of the spirit and scope of the universal that does not deviate from claim and equivalency range and limited, the examples shown that the present invention is not limited to specific details, representational equipment and illustrates here and describe.
Claims (7)
1. method of differentiating indoor 50Hz or 60Hz photoenvironment comprises step:
1) utilizes automatic exposure control procedure unit,, the time shutter is automatically adjusted according to brightness of illumination at that time; 2) from one group of exposure value that configures in advance, choose with step 1) in a most approaching time shutter of net result, and this exposure time values is set at new time shutter of total system; 3) in step 2) under time shutter of setting, calculate the difference D1 of the brightness value between two continuous frames image respective pixel; 4) from another exposure value of configuring in advance of group, choose with step 1) in a most approaching time shutter of net result, and this exposure time values is set at new time shutter of total system; 5) under the time shutter that step 4) is set, calculate the difference D2 of the brightness value between two continuous frames image respective pixel; 6) if D1＜D2, then when the used alternating current of front lit be 50Hz; If D＞D2, then working as the used alternating current of front lit is 60Hz; If D1=D2 then gets back to step 2) recomputate.
2. the exposure value that this group of mentioning a kind of method of differentiating indoor 50Hz or 60Hz photoenvironment according to claim 1, described step 2) configures in advance comprises { 2/100,3/100,7/100,8/100,12/100,13/100,17/100,18/100,22/100,23/100,27/100,28/100,32/100,33/100,37/100,38/100}, unit is second.
3. the exposure value that this group of a kind of method of differentiating indoor 50Hz or 60Hz photoenvironment according to claim 1, described step 2), mentioning in the step 4) configures in advance comprises { 3/120,9/120,15/120,21/120,27/120,33/120,39/120,45/120}, unit is second.
4. a kind of method of differentiating indoor 50Hz or 60Hz photoenvironment according to claim 1 when calculating the luminance difference of respective pixel value of two continuous frames image in step 3) and step 5), is that all pixels in the view picture image are calculated.
5. a kind of method of differentiating indoor 50Hz or 60Hz photoenvironment according to claim 1 when calculating the luminance difference of respective pixel value of two continuous frames image in step 3) and step 5), is to get the partial pixel value to calculate.
6. a kind of method of differentiating indoor 50Hz or 60Hz photoenvironment according to claim 1 when calculating the luminance difference of respective pixel value of two continuous frames image in step 3) and step 5), is only calculated once.
7. a kind of method of differentiating indoor 50Hz or 60Hz photoenvironment according to claim 1 is when calculating the luminance difference of respective pixel value of two continuous frames image, by calculating repeatedly averaged or maximum, minimum value in step 3) and step 5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100378257A CN100405206C (en) | 2004-05-11 | 2004-05-11 | Method for determining indoor illumination environment being as 50Hz or 60Hz |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100378257A CN100405206C (en) | 2004-05-11 | 2004-05-11 | Method for determining indoor illumination environment being as 50Hz or 60Hz |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1696811A true CN1696811A (en) | 2005-11-16 |
| CN100405206C CN100405206C (en) | 2008-07-23 |
Family
ID=35349584
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100378257A Expired - Fee Related CN100405206C (en) | 2004-05-11 | 2004-05-11 | Method for determining indoor illumination environment being as 50Hz or 60Hz |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100405206C (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101726247B (en) * | 2008-10-31 | 2012-10-10 | 鸿富锦精密工业（深圳）有限公司 | Light irradiation regulating method and computer system thereof |
| CN103475813A (en) * | 2013-08-26 | 2013-12-25 | 上海斐讯数据通信技术有限公司 | Photograph information adding system and method |
| CN110381276A (en) * | 2019-05-06 | 2019-10-25 | 华为技术有限公司 | A kind of video capture method and electronic equipment |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3370979B2 (en) * | 2000-09-08 | 2003-01-27 | 三菱電機株式会社 | Imaging apparatus and automatic level adjustment method |
| JP4416959B2 (en) * | 2001-04-26 | 2010-02-17 | 富士通マイクロエレクトロニクス株式会社 | Flicker noise reduction method for XY address type solid-state imaging device |
| JP3823314B2 (en) * | 2001-12-18 | 2006-09-20 | ソニー株式会社 | Imaging signal processing apparatus and flicker detection method |
| JP4337353B2 (en) * | 2002-03-25 | 2009-09-30 | セイコーエプソン株式会社 | Flicker detection device, flicker correction device, imaging device, flicker detection program, and flicker correction program |
-
2004
- 2004-05-11 CN CNB2004100378257A patent/CN100405206C/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101726247B (en) * | 2008-10-31 | 2012-10-10 | 鸿富锦精密工业（深圳）有限公司 | Light irradiation regulating method and computer system thereof |
| CN103475813A (en) * | 2013-08-26 | 2013-12-25 | 上海斐讯数据通信技术有限公司 | Photograph information adding system and method |
| CN103475813B (en) * | 2013-08-26 | 2018-01-16 | 上海斐讯数据通信技术有限公司 | A kind of photographic intelligence add-on system and information adding method |
| CN110381276A (en) * | 2019-05-06 | 2019-10-25 | 华为技术有限公司 | A kind of video capture method and electronic equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100405206C (en) | 2008-07-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102479496B (en) | Local dimming method and liquid crystal display | |
| JP5570791B2 (en) | Display device driving method | |
| CN101383139B (en) | Luminance control method for display screen | |
| CN102243855B (en) | Integrated backlight dimming method and device for enhancing liquid crystal display contrast ratio | |
| RU2464605C1 (en) | Methods and systems for reducing colour shift caused by viewing angle | |
| US8493313B2 (en) | Temporal filtering of video signals | |
| US8547321B2 (en) | LED backlight driver synchronization and power reduction | |
| CN1985523B (en) | Light emitting device driving method and projection apparatus so equipped | |
| JP5270730B2 (en) | Video display device | |
| US9123281B2 (en) | Lighting apparatus having a plurality of light sources and control method thereof | |
| US20090167670A1 (en) | Method of determining luminance values for a backlight of an lcd panel displaying an image | |
| US9142164B2 (en) | Video display device | |
| US8400385B2 (en) | Method for enhancing an image displayed on an LCD device | |
| CN102483905A (en) | Display device and display method | |
| JP2010250320A (en) | Method for correcting pixel data, and display apparatus for performing the method | |
| US20160255692A1 (en) | Led driver circuit | |
| CN104639920A (en) | Wide dynamic fusion method based on single-frame double-pulse exposure mode | |
| JP5039566B2 (en) | Method and apparatus for improving visual perception of image displayed on liquid crystal screen, liquid crystal panel, and liquid crystal screen | |
| CN109036334B (en) | Brightness control method and device of display device | |
| CN1696811A (en) | Method for determining indoor illumination environment being as 50Hz or 60Hz | |
| JP5087170B2 (en) | Backlight device and display device | |
| EP2038873A1 (en) | Display device and method of providing illumination thereto | |
| TW202013332A (en) | Local dimming system adaptable to a backlight of a display | |
| WO2009086742A1 (en) | Method and apparatus for enhancing an image displayed on an lcd device | |
| CN202178047U (en) | Liquid crystal display backlight device with integral light-adjusting function |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| ASS | Succession or assignment of patent right |
Owner name: GUANGDONG ZHONGXING ELECTRONICS CO., LTD. Free format text: FORMER OWNER: BEIJING VIMICRO CORPORATION Effective date: 20150228 |
|
| C41 | Transfer of patent application or patent right or utility model | ||
| COR | Change of bibliographic data |
Free format text: CORRECT: ADDRESS; FROM: 100083 HAIDIAN, BEIJING TO: 519031 ZHUHAI, GUANGDONG PROVINCE |
|
| TR01 | Transfer of patent right |
Effective date of registration: 20150228 Address after: 519031 Guangdong city of Zhuhai province Hengqin Baohua Road No. 6, room 105 -478 Patentee after: Guangdong Zhongxing Electronics Co.,Ltd. Address before: 100083, Haidian District, Xueyuan Road, Beijing No. 35, Nanjing Ning building, 15 Floor Patentee before: VIMICRO Corp. |
|
| DD01 | Delivery of document by public notice |
Addressee: Guangdong Zhongxing Electronics Co.,Ltd. Document name: Notification of Passing Examination on Formalities |
|
| DD01 | Delivery of document by public notice |
Addressee: Shen Yingming Document name: payment instructions |
|
| DD01 | Delivery of document by public notice | ||
| DD01 | Delivery of document by public notice |
Addressee: Shen Yingming Document name: Notice of Termination of Patent Rights |
|
| DD01 | Delivery of document by public notice | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080723 |