CN1603933A - Shutter speed control method for built-in camera of mobile communication terminal - Google Patents
Shutter speed control method for built-in camera of mobile communication terminal Download PDFInfo
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- CN1603933A CN1603933A CNA2004100375884A CN200410037588A CN1603933A CN 1603933 A CN1603933 A CN 1603933A CN A2004100375884 A CNA2004100375884 A CN A2004100375884A CN 200410037588 A CN200410037588 A CN 200410037588A CN 1603933 A CN1603933 A CN 1603933A
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- shutter speed
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- mobile communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
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Abstract
This invention involving a shutter speed control method for built-in camera of communication terminal.When user want to use the camera,a menu is provided for appointing shutter velocity and user can control it by inputing the amplitude of regulating charge dissipation pulse.This invention can not only regulate the receiving light amount of image sensor so as to regulate exposure and make the moving or lack-brightness object shoot more distinctively,but can reduce the use of optical filtering software and improve the quality of image according to the user selection and apply various effect.
Description
Technical field
The present invention relates to the shutter speed control method of mobile communication terminal built-in camera, particularly in the present invention, the user can specify mobile communication terminal built-in/shutter speed of external camera, the variation of corresponding light and shade under situation about not underspeeding.
Background technology
Along with the function of mobile communication terminal is various day by day, mobile communication terminal develops into the multimedia device that utilizes various data communication from the device that is used for simple telephone relation.For this function is provided, mobile communication terminal not only has the display part of precision and excellent performance and huge storer, also has the high performance computation device, even the built-in camera that is used to obtain multimedia image.
The camera function that provides has now generally been realized 100,000 pixel level already, and among 330,000 pixel level were being sold, the product that 1,000,000 pixel level cameras are installed was about to come out soon.Except the raising of this resolution, the also built-in digital zoom functions that is used to improve camera properties.Just in development product, adopt the product of 8 multiple word zooms and 8 Zoom Lens current in addition, can guarantee the visual field more outstanding than naked eyes.
By means of the development rapidly of above-mentioned camera function, also add to successively in the mobile phone based on the multiple application function of camera, wherein, take pictures and it is carried out special processing or understand functions such as two-dimensional bar code being achieved.
In general, for the built-in camera function of the mobile communication terminal of present use, the control section of camera function is built in the terminal, image of camera sensor and image driver portion are according to design and user's selection, insert the terminal fuselage, perhaps be made as other attachment device, can install from the outside.At this, this inside and outside camera of putting all is counted as built-in (must be present in the terminal because handle required set hardware and the software of camera function) in the camera function of mobile communication terminal.
The camera function that provides now can continue image to show to the user in real time, corresponding scene can be stored as photo or activity video when the user needs.Therefore, in order to use this digital camera or camcorder function, must carry out the colourity and the brightness regulation of image, it is to the most of image that obtains from the imageing sensor processing that suitably filters.That is, when regulating brightness, obtain the light intensity in the set zone of imageing sensor (Optical Path Difference:OPD district) by integration, should value and reference value compare adjusting optical filtering value.Value in this adjusting is the value of the brightness part of image data, and adjusted method with rising or reduction brightness is the well-known content of practitioner of the industry.This is called as ABC function or automatic exposure debugging functions, can to the reference value set when making or user stage by stage the brightness of the image that obtains of the reference value of appointment regulate.
Yet, in this case, because the maintenance of practical shutters speed is identical, just the image that obtains is merely operated the action of optical filtering value, so when brightness changed, strain was slow, if increase the brightness of gloomy image by software, the problem that image quality reduces significantly then take place.And, owing to utilize software that image is handled, also taking place because of outside brightness causes the problem that processing speed is different, this has caused the interrupted problem of image occurring when taking activity video.In addition, when taking mobile object or light when inadequate, be difficult to obtain distinct image by simple optical filtering.
Fig. 1 is the signal waveforms that shows the electronic shutter principle of work in general frame period.As shown in the figure, the shutter speed of action is identical all the time in each frame unit (cycle of vertical synchronizing signal (Vsync)), promptly, the cycle of each vertical synchronizing signal (Vsync) was made of following two times: one, former data for the removal of images sensor, in horizontal flyback time, apply the electric-charge-dissipating time (CEd) of the electric-charge-dissipating pulse (Pd) of eliminating electric charge with basic voltage (Vsub); Two, from the electric charge accumulating time (Cd) of the new receiving optical signals of image.The length of electric-charge-dissipating pulse (Pd) is identical.Therefore, irrelevant with outside light and shade under the certain situation of shutter speed, imageing sensor receives outside light all the time in identical electric charge accumulating time (Cp), so view data is subjected to the influence of moving of outside brightness and object.
And the exposure correction major part of the camera that provides now is fixed as automatic correction, so after partly obtaining the brightness of image, it is performed calculations, periodically implements to revise this operation extremely slowly of brightness.Therefore, if the calculation amount increases, it is slack-off that the image output time will take place, the interrupted problem of image when activity video is taken.
For example, if the image integral body that is made of the data that receive by the shutter speed of said fixing seems gloomy, so, have limitation aspect making by software that it brightens, excessive brightness regulation can cause the damage of picture quality.In addition, when object moves, can only obtain to move the fuzzy image of accumulation by fixing shutter speed.Especially when indoor shot in night or dark, the quality of obtainable image quality extremely low.
As mentioned above, because the shutter speed of mobile communication terminal built-in camera was fixed in the past, so for the outside brightness of correspondence, can only rely on software exposure correction, the darker image correction that obtains must be become clear, exist the image quality damage serious in this case, can't be applicable to the problem of activity video.And, owing to must carry out software processes, so the processing time is elongated, the interrupted problem of picture appears when taking activity video.
Summary of the invention
The object of the present invention is to provide a kind of shutter speed control method of mobile communication terminal built-in camera, when the user will utilize camera function, provide the menu that can specify shutter speed for the user, the user can regulate the amplitude of electric-charge-dissipating pulse by input.Thereby the amount that not only can regulate the light of imageing sensor reception is regulated exposure, takes the object of mobile object or luminance shortage distinct more, can also obtain the image of high-quality more according to user's selection.
For achieving the above object, the present invention includes following steps: step 1, the user enters the camera mode of mobile communication terminal, selects the manual shutter velocity mode; Step 2 is received the shutter speed of input, and according to described shutter speed, and the length of the electric-charge-dissipating pulse that will provide to imageing sensor is changed into the value of prior setting, regulates the electric charge accumulating time of described imageing sensor to reference object with this; Step 3 is by the electric charge accumulating time acquisition image of described setting.
Another feature of the present invention is: the length of the electric-charge-dissipating pulse of described prior setting shortens when taking gloomy image, and is elongated when taking bright or moving object.
In the shutter speed control method of mobile communication terminal built-in camera of the present invention, when the user will use camera function, provide the menu that can specify shutter speed for the user, the user can regulate the amplitude of electric-charge-dissipating pulse by input.Thereby have following effect, that is, not only can regulate the amount of the light of imageing sensor reception, regulate exposure, take the object of mobile object or luminance shortage distinct more, can also reduce the use that software filters, improve the quality of image simultaneously according to user's selection, use multiple effect.
Description of drawings
Fig. 1 is the signal waveforms that shows the electronic shutter principle of work in existing frame period;
Fig. 2 is the action flow chart of one embodiment of the invention.
Embodiment
Below with reference to the accompanying drawing of embodiment, describe aforesaid the present invention in detail.
Fig. 2 is the action flow chart of one embodiment of the invention.As shown in the figure, the present invention includes an input of receiving the user, the process of shutter speed can manually be set.
As shown in the figure, change had the fixedly control program of the mobile communication terminal built-in camera function of shutter speed in the past, can carry out manual operation to shutter speed simply.
At first, when the user operated mobile communication terminal and enters camera mode, mobile communication terminal can provide multiple shutter speed patterns such as automatic gate velocity mode, manual shutter velocity mode.At this manual shutter speed pattern is described.
As shown in the figure, the user selects the manual shutter velocity mode, after the required speed of key operation adjusting, according to corresponding speed, is set to the shutter value that is provided with in advance.For this reason, be preferably in the multiple shutter value of output on the picture, select for the user.Parameter value according to each shutter value control shutter speed can be specified in the design phase.
After finishing being provided with of shutter speed according to above-mentioned user's selection, picture shows that by the shutter speed that is provided with the user can carry out photograph taking, activity video shooting, Image Communication etc. by respective picture.Also can preserve setting value, re-use later on.
If the user does not carry out the shutter speed manual adjustments, the setting value display frame of preserving before then directly using.
Said method is to regulate shutter speed by the fixed value that the user is provided with, and when suitably being provided with, compares with the exposure compensating image that obtains that filters by simple software, can obtain distinct result.
The manual adjustments of this shutter speed can be achieved by the length of regulating electric-charge-dissipating pulse illustrated in fig. 1.The length of electric-charge-dissipating pulse is used the value in the design phase decision, with the shutter speed of respective user selection.That is, if external environment condition is gloomy, then the length of electric-charge-dissipating pulse reduces, and prolongs the electric charge accumulating time (shutter speed slows down) that obtains image, thereby even also can obtain the image data of high-quality under the environment of insufficient light.So, when night or indoor the shooting,, can obtain the much higher image of quality than simple luminance transformation.In addition, utilize shutter speed slowly, can also as manual continuous shooting flame etc. mobile the camera.Because the change of shutter speed can improve brightness by the increase of physical property light, rather than by the software computing, so the slack-off phenomenon of processing speed can not take place.
If external environment condition is brighter, or when catching mobile object, the length of electric-charge-dissipating pulse is elongated with rocking, shortens the electric charge accumulating time (raising shutter speed) that obtains image, thereby can obtain the light of proper level rapidly.So, the high speed image data can be obtained, continuous shooting function can also be used.Thereby, can under the situation that focus is not rocked, obtain the image of mobile object, the local image that can become clear is captured as the image of proper level, reduces to compare with simple brightness, can obtain the much higher image of quality.
Promptly, when utilizing fixing shutter speed to obtain image, if object is gloomy or bright, then utilize the part of histogram (histogram) in data value zone (data height) of the image of imageing sensor acquisition to tilt, can't obtain the equally distributed image of data.So if only change the brightness that is distributed in the regional data value of a part by software, quality must descend so.Because in the present invention the physical property electric charge accumulating time is regulated, so that the signal of video signal data that obtain evenly distribution in presentation, so can obtain the fully image of height.
The electronic shutter function of using in present a part of digital camera is not the function at exposure, but in order to catch by decision the time of target object, to obtain distinct mobile object.That is, the mode of its use be shutter speed is transferred fast, obtain mobile object brightly after, filter to replenish inadequate exposure by improving brightness.Therefore, pass through of it should be noted that this and the present invention propose changes electronic shutter speed, and to obtain the application purpose of constant brightness image also inconsistent.The present invention can obtain the required image of user by high-quality when containment filters.
The change of this electric-charge-dissipating pulse length also can realize automatically, at this moment measures light intensity in the set zone (OPD district) of imageing sensor, and presses the brightness of the mean value acquisition reference object of these values, the length that can also regulate the electric-charge-dissipating pulse in view of the above.So this automatic gate velocity mode also can the basis of described in front manual shutter pattern on additional providing.
But core of the present invention is that the user can manually be provided with shutter speed according to the shooting purpose of self, improves the quality of image to greatest extent, and can improve the expressive force of image thus by user's manual operation.
As mentioned above, in the shutter speed control method of mobile communication terminal built-in camera of the present invention, when the user will use camera function, provide the menu that can specify shutter speed for the user, the user can regulate the amplitude of electric-charge-dissipating pulse by input.Thereby have following effect, that is, not only can regulate the amount of the light of imageing sensor reception, regulate exposure, take the object of mobile object or luminance shortage distinct more, can also reduce the use that software filters, improve the quality of image simultaneously according to user's selection, use multiple effect.
Above embodiment only limits to illustrate the present invention, but not is used to limit the present invention.
Claims (4)
1. the shutter speed control method of a mobile communication terminal built-in camera is characterized in that may further comprise the steps: step 1, and the user enters the camera mode of mobile communication terminal, selects the manual shutter velocity mode; Step 2, receive shutter speed input after, according to described shutter speed, the length of the electric-charge-dissipating pulse that will provide to imageing sensor is changed into the value of prior setting, regulates the electric charge accumulating time of described imageing sensor to reference object with this; Step 3 is by the electric charge accumulating time acquisition image of described setting.
2. the shutter speed control method of mobile communication terminal built-in camera according to claim 1 is characterized in that: the length of the electric-charge-dissipating pulse that is provided with shortens when taking gloomy image in advance, and is elongated when shooting becomes clear object.
3. the shutter speed control method of mobile communication terminal built-in camera according to claim 1 is characterized in that: the length of the electric-charge-dissipating pulse that is provided with is elongated when taking moving object in advance.
4. the shutter speed control method of mobile communication terminal built-in camera according to claim 1, it is characterized in that: described camera mode also provides to be measured the light in imageing sensor part zone, automatically change the automatic gate velocity mode of shutter speed, can select for the user.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020030068028 | 2003-09-30 | ||
| KR1020030068028A KR100608717B1 (en) | 2003-09-30 | 2003-09-30 | Shutter speed control method for built-in camera of mobile communication terminal |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1603933A true CN1603933A (en) | 2005-04-06 |
| CN100378568C CN100378568C (en) | 2008-04-02 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100375884A Expired - Fee Related CN100378568C (en) | 2003-09-30 | 2004-04-28 | Shutter speed control method for built-in camera of mobile communication terminal |
Country Status (2)
| Country | Link |
|---|---|
| KR (1) | KR100608717B1 (en) |
| CN (1) | CN100378568C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102316221A (en) * | 2011-09-23 | 2012-01-11 | 惠州Tcl移动通信有限公司 | Mobile terminal with camera shutter function and implementation method thereof |
| CN101873438B (en) * | 2009-04-24 | 2012-07-04 | 上海乐金广电电子有限公司 | Slow shutter speed control device of camera and method thereof |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100706383B1 (en) * | 2004-10-01 | 2007-04-10 | 주식회사 팬택앤큐리텔 | mobile communication terminal with digital photographying facility and method for picking up a digital image |
| KR100702044B1 (en) * | 2005-03-08 | 2007-03-30 | 엘지전자 주식회사 | Mobile communication terminal with Camera filter |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3004382B2 (en) * | 1991-04-24 | 2000-01-31 | 松下電器産業株式会社 | TV camera device with variable shutter |
| KR100242014B1 (en) * | 1997-06-20 | 2000-02-01 | 윤종용 | Shutter speed control apparatus and method for digital still camera |
-
2003
- 2003-09-30 KR KR1020030068028A patent/KR100608717B1/en not_active IP Right Cessation
-
2004
- 2004-04-28 CN CNB2004100375884A patent/CN100378568C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101873438B (en) * | 2009-04-24 | 2012-07-04 | 上海乐金广电电子有限公司 | Slow shutter speed control device of camera and method thereof |
| CN102316221A (en) * | 2011-09-23 | 2012-01-11 | 惠州Tcl移动通信有限公司 | Mobile terminal with camera shutter function and implementation method thereof |
| CN102316221B (en) * | 2011-09-23 | 2014-03-19 | 惠州Tcl移动通信有限公司 | Mobile terminal with camera shutter function and implementation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20050031770A (en) | 2005-04-06 |
| KR100608717B1 (en) | 2006-08-04 |
| CN100378568C (en) | 2008-04-02 |
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Granted publication date: 20080402 |