CN104144300A - Light compensating method for dual-mode mobile phone camera - Google Patents
Light compensating method for dual-mode mobile phone camera Download PDFInfo
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- CN104144300A CN104144300A CN201410415514.3A CN201410415514A CN104144300A CN 104144300 A CN104144300 A CN 104144300A CN 201410415514 A CN201410415514 A CN 201410415514A CN 104144300 A CN104144300 A CN 104144300A
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Abstract
The invention provides a light compensating method for a dual-mode mobile phone camera. A first DA converter is connected to a first photosensitive element, and converts analog electrical signals output by the first photosensitive element into digital signals; image signals output by a first webcam and a second webcam are received through an image processing module and converted into digital signals; the digital signals output by the first DA converter are received through a dimming module, and dimming signals are output according to a prestored data table; the first dimming signals are coupled to a first power conversion circuit, and the value of the current output to a first LED by the first power conversion circuit is controlled; the second dimming signals are coupled to an image synthesis module; the second dimming signals of the image processing module and the dimming module are connected to the image synthesis module.
Description
Technical field
The present invention relates to electronic technology field, refer to especially a kind of camera.
Background technology
Since First camera is in the world born, is just doomed camera and will have changed the mankind's life and history.Camera is called for short camera, is a kind of equipment that utilizes optical imaging concept to form image and use negative writing image.
The light that subject reflects forms sub-image on the photosensitive material of subject in camera bellows after focusing on by the shutter of photographic film and control exposure, forms permanent image through rinsing to process.Camera architecture is the earliest very simple, only comprises camera bellows, camera lens and photosensitive material.Modern camera more complicated, there is camera lens, aperture, shutter, find range, find a view, the system such as photometry, film trasport, counting, auto heterodyne, focusing, zoom, modern camera is the complex product of the technology such as a kind of combination optics, precision optical machinery, electronic technology and chemistry.
Digital camera is a kind of camera that utilizes electronic sensor optical image to be converted to electronic data.On film, to carry out the principle of document image by the chemical change of silver bromide different from ordinary camera, and the transducer of digital camera is a kind of electric charge coupling (CCD) or complementary metal oxide semiconductors (CMOS) (CMOS) of photoinduction formula., before computer, conventionally can first be stored in digital storage equipment at image transmitting.
Mobile phone and camera are born combinations, along with the development of software and hardware, the shooting effect of the light compensation method of dual-mode handset camera, has more and more approached mm professional camera special, especially the Self-timer of the light compensation method of dual-mode handset camera, mm professional camera special is incomparable especially.The moment of the light compensation method of dual-mode handset camera, mainly operates by user's oneself experience, and due to shooting angle with take the restriction of posture, the light filling of the moment photo that causes autodyning operates and cannot optimize.
Summary of the invention
The present invention proposes a kind of light compensation method of dual-mode handset camera, has solved restriction, the photo light filling due to shooting angle and posture in prior art and has operated the problem that cannot optimize.
Technical scheme of the present invention is achieved in that
A light compensation method for dual-mode handset camera, based on being arranged on the first camera, a LED in mobile phone front and being arranged on first photo-sensitive cell at the mobile phone back side, described the first photo-sensitive cell and the first camera are used in conjunction with; Comprise the following steps:
Step (a), is connected to described the first photo-sensitive cell by a DA transducer, and the analog electrical signal of its output is converted to digital signal;
Step (b), receives the picture signal of described the first camera and second camera output by image processing module, be converted into digital signal;
Step (c), receives by light-adjusting module the digital signal that a described DA transducer is exported, according to the tables of data output dim signal prestoring;
Step (d), is couple to the first power transformation circuit by the first dim signal, and control the first power transformation circuit outputs to the current value of a LED;
The step of carrying out power converter by described the first power transformation circuit specifically comprises:
First, carry out the conversion of electric pressure by transformer, described transformer comprises former limit winding and secondary winding, former limit winding comprises first end and the second end, secondary winding comprises first end and the second end, former limit winding first end is connected to battery, and secondary winding the second end is connected to secondary earth potential, and former limit winding first end and secondary winding the second end are Same Name of Ends;
Then, by the first switching tube, input voltage is carried out to copped wave processing, the source electrode of the first switching tube is connected to transformer primary side winding the second end, and its drain electrode is connected to former limit earth potential, and its grid is connected to the first switch driver;
Next, by the first switch driver, the conducting duty ratio of described the first switching tube is modulated, the first switch driver comprises the first transistor and transistor seconds, the first transistor is NPN transistor, transistor seconds is PNP transistor, the base stage of the first transistor and transistor seconds links together as control end, control end receives described the first dim signal, the emitter of the first transistor and transistor seconds links together as output, the collector electrode of the first transistor is connected to battery, and the collector electrode of transistor seconds is connected to former limit earth potential;
Step (e), is couple to image synthesis unit by the second dim signal;
Step (f), image synthesis unit is connected to the second dim signal of described image processing module and light-adjusting module, when the influence value of the first photo-sensitive cell on the weak side, export the first dim signal to the first power transformation circuit, control a LED to reference object light filling, image synthesis unit is directly exported the picture signal of the first camera; When the influence value of the first photo-sensitive cell is partially strong, output the second dim signal is to image synthesis unit, and image synthesis unit is synthesized the image of the first camera and the second dim signal, and output is through the picture signal of the synthetic light modulation of software.
The invention has the beneficial effects as follows:
Be used in conjunction with by the photo-sensitive cell and the camera that are arranged on an other side, picture signal and the dim signal when light is partially strong, camera taken are synthetic, and output is through the image of light modulation; When light is on the weak side, control LED to reference object light filling, the color and luster of image is optimized.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is light compensation side's ratio juris control block diagram of dual-mode handset camera of the present invention;
Fig. 2 is the flow chart of the light compensation method of dual-mode handset camera of the present invention;
Fig. 3 is the circuit diagram of the present invention's the first power transformation circuit;
Fig. 4 is the present invention carries out power converter flow chart by the first power transformation circuit.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
As shown in Figure 1, the light compensation method of a kind of dual-mode handset camera of the present invention, its operation principle is: be arranged on the first camera 11, a LED13 in mobile phone front and be arranged on first photo-sensitive cell 12 at the mobile phone back side, described the first photo-sensitive cell 12 and the first camera 11 are used in conjunction with.
The one DA transducer 31, is connected to described the first photo-sensitive cell 11, and the analog electrical signal of its output is converted to digital signal; Image processing module 41, receives the picture signal that described the first camera 11 is exported, and is converted into digital signal; Light-adjusting module 42, receives the digital signal of a described DA transducer 31, according to the tables of data output dim signal prestoring.
The first dim signal, is couple to the first power transformation circuit 14, and control the first power transformation circuit 14 outputs to the electric current of a LED; The second dim signal, is couple to image synthesis unit 43.
Image synthesis unit 43, be connected to the second dim signal of described image processing module 41 and light-adjusting module 42, when the influence value of the first photo-sensitive cell 12 on the weak side, export the first dim signal to the first power transformation circuit 14, control a LED13 to reference object light filling, image synthesis unit 43 is directly exported the picture signal of the first camera; When the influence value of the first photo-sensitive cell 12 is partially strong, output the second dim signal is to image synthesis unit 43, and image synthesis unit 43 is synthesized the image of the first camera and the second dim signal, and output is through the picture signal of the synthetic light modulation of software.
Based on the description of the above-mentioned operation principle to the inventive method, as shown in Figure 2, the light compensation method of dual-mode handset camera of the present invention specifically comprises the following steps:
Step (a), is connected to described the first photo-sensitive cell by a DA transducer, and the analog electrical signal of its output is converted to digital signal;
Step (b), receives the picture signal of described the first camera and second camera output by image processing module, be converted into digital signal;
Step (c), receives by light-adjusting module the digital signal that a described DA transducer is exported, according to the tables of data output dim signal prestoring;
Step (d), is couple to the first power transformation circuit by the first dim signal, and control the first power transformation circuit outputs to the current value of a LED;
Step (e), is couple to image synthesis unit by the second dim signal;
Step (f), image synthesis unit is connected to the second dim signal of described image processing module and light-adjusting module, when the influence value of the first photo-sensitive cell on the weak side, export the first dim signal to the first power transformation circuit, control a LED to reference object light filling, image synthesis unit is directly exported the picture signal of the first camera; When the influence value of the first photo-sensitive cell is partially strong, output the second dim signal is to image synthesis unit, and image synthesis unit is synthesized the image of the first camera and the second dim signal, and output is through the picture signal of the synthetic light modulation of software.
As shown in Figure 3, the first power transformation circuit 50 comprises: transformer 51, comprise former limit winding and secondary winding, former limit winding comprises first end and the second end, secondary winding comprises first end and the second end, former limit winding first end is connected to storage battery as input, and secondary winding the second end is connected to secondary earth potential, and former limit winding first end and secondary winding the second end are Same Name of Ends; The first switching tube 52, its source electrode is connected to transformer primary side winding the second end, and its drain electrode is connected to former limit earth potential, and its grid is connected to the first switch driver 53; The first switch driver 53, comprise the first transistor and transistor seconds, the first transistor is NPN transistor, transistor seconds is PNP transistor, the base stage of the first transistor and transistor seconds links together as control end, the emitter of the first transistor and transistor seconds links together as output, and the collector electrode of the first transistor is connected to power supply, and the collector electrode of transistor seconds is connected to former limit earth potential; The first diode 54, its anodic bonding is to transformer secondary winding first end, and its negative electrode is connected to the first inductor 55; The common port of the first inductor 55 and the first capacitor 56 is as output, and the other end of the first capacitor 56 is connected to secondary earth potential.
Described light-adjusting module 42 is exported the control end of the first dim signal to the first switch driver 53, the turn-on and turn-off of control switch pipe, and then control the electric current that outputs to a LED.
Based on the above-mentioned description to the first power transformation circuit circuit diagram, as shown in Figure 4, the step of carrying out power converter by described the first power transformation circuit specifically comprises:
First, carry out the conversion of electric pressure by transformer, described transformer comprises former limit winding and secondary winding, former limit winding comprises first end and the second end, secondary winding comprises first end and the second end, former limit winding first end is connected to battery, and secondary winding the second end is connected to secondary earth potential, and former limit winding first end and secondary winding the second end are Same Name of Ends;
Then, by the first switching tube, input voltage is carried out to copped wave processing, the source electrode of the first switching tube is connected to transformer primary side winding the second end, and its drain electrode is connected to former limit earth potential, and its grid is connected to the first switch driver;
Next, by the first switch driver, the conducting duty ratio of described the first switching tube is modulated, the first switch driver comprises the first transistor and transistor seconds, the first transistor is NPN transistor, transistor seconds is PNP transistor, the base stage of the first transistor and transistor seconds links together as control end, control end receives described the first dim signal, the emitter of the first transistor and transistor seconds links together as output, the collector electrode of the first transistor is connected to battery, and the collector electrode of transistor seconds is connected to former limit earth potential.
Above-mentioned image processing module 41, light-adjusting module 42 and image synthesis unit 43 can adopt discrete structure to realize, and select 3 chip blocks, and realize image synthetic function by the circuit of taking outward; Image processing module 41, light-adjusting module 42 and image synthesis unit 43 also can adopt integrated structure to realize, and realize image processing module 41, light-adjusting module 42 and image synthesis unit 43 by the internal processes of DSP circuit.
Preferably, described dsp chip is TMS320DM642 chip.
TMS320DM642 is up-to-date fixed DSP in the C6000 of TI company series DSP, its core is C6416 type high-performance digital signal processor, there is extremely strong handling property, flexibility and the programmability of height, equipment and the interfaces such as simultaneously peripheral integrated very complete audio frequency, video and network service.
TMS320DM642 chip comprises: 3 configurable video ports (VPORT0-2) can be realized seamless link with general video coding and decoding device, support various video resolution and video standard, support RAW video input/output, transport stream mode; 1 10/100Mb/s Ethernet interface (EMAC), meets IEEE 802.3 standards; 1 multichannel band buffered audio serial port (McASP), supports I2S, DIT, S/PDIF, IEC60958-1, the audio formats such as AES-3, CP-430; 2 multichannel band buffering serial ports (McBSP), adopt RS232 level to drive; 1 VCXO interpolation control unit (VIC), supports that audio/video is synchronous; 1 32,66M hertz, the master/slave pci interface of 3.3V, follow PCI2.2 specification; 1 configurable 16/32 host interface of user (HPI); 1 16 general input/output port (GPIO); 1 64 external memory interfaces (EMIF), can with most of asynchronous memories (SRAM, EPROM) and synchronous memories (SDRAM, SBSRAM, ZBT SRAM, FIFO) seamless link, maximum addressable external memory storage space is 1024MB; 1 has the enhancement mode direct memory access controller (EDMA) of 64 autonomous channels, tunnel; 1 data management input/output module (MDIO); 1 I2C bus module; 3 32 general purpose timers; 1 meets jtag interface and the daughter board interface etc. of IEEE 1149.1 standards.
The present invention is used in conjunction with by the photo-sensitive cell and the camera that are arranged on an other side, and picture signal and the dim signal when light is partially strong, camera taken are synthetic, and output is through the image of light modulation; When light is on the weak side, control LED to reference object light filling, the color and luster of image is optimized.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (1)
1. a light compensation method for dual-mode handset camera, based on being arranged on the first camera, a LED in mobile phone front and being arranged on first photo-sensitive cell at the mobile phone back side, described the first photo-sensitive cell and the first camera are used in conjunction with; It is characterized in that, comprise the following steps:
Step (a), is connected to described the first photo-sensitive cell by a DA transducer, and the analog electrical signal of its output is converted to digital signal;
Step (b), receives the picture signal of described the first camera and second camera output by image processing module, be converted into digital signal;
Step (c), receives by light-adjusting module the digital signal that a described DA transducer is exported, according to the tables of data output dim signal prestoring;
Step (d), is couple to the first power transformation circuit by the first dim signal, and control the first power transformation circuit outputs to the current value of a LED;
The step of carrying out power converter by described the first power transformation circuit specifically comprises:
First, carry out the conversion of electric pressure by transformer, described transformer comprises former limit winding and secondary winding, former limit winding comprises first end and the second end, secondary winding comprises first end and the second end, former limit winding first end is connected to battery, and secondary winding the second end is connected to secondary earth potential, and former limit winding first end and secondary winding the second end are Same Name of Ends;
Then, by the first switching tube, input voltage is carried out to copped wave processing, the source electrode of the first switching tube is connected to transformer primary side winding the second end, and its drain electrode is connected to former limit earth potential, and its grid is connected to the first switch driver;
Next, by the first switch driver, the conducting duty ratio of described the first switching tube is modulated, the first switch driver comprises the first transistor and transistor seconds, the first transistor is NPN transistor, transistor seconds is PNP transistor, the base stage of the first transistor and transistor seconds links together as control end, control end receives described the first dim signal, the emitter of the first transistor and transistor seconds links together as output, the collector electrode of the first transistor is connected to battery, and the collector electrode of transistor seconds is connected to former limit earth potential;
Step (e), is couple to image synthesis unit by the second dim signal;
Step (f), image synthesis unit is connected to the second dim signal of described image processing module and light-adjusting module, when the influence value of the first photo-sensitive cell on the weak side, export the first dim signal to the first power transformation circuit, control a LED to reference object light filling, image synthesis unit is directly exported the picture signal of the first camera; When the influence value of the first photo-sensitive cell is partially strong, output the second dim signal is to image synthesis unit, and image synthesis unit is synthesized the image of the first camera and the second dim signal, and output is through the picture signal of the synthetic light modulation of software.
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| CN201410415514.3A CN104144300A (en) | 2014-08-21 | 2014-08-21 | Light compensating method for dual-mode mobile phone camera |
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| CN201410415514.3A CN104144300A (en) | 2014-08-21 | 2014-08-21 | Light compensating method for dual-mode mobile phone camera |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107809595A (en) * | 2017-11-14 | 2018-03-16 | 李春莲 | Mobile intelligent helps shooting system |
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| US20110080497A1 (en) * | 1999-09-14 | 2011-04-07 | Nikon Corporation | Electronic still camera with peaking function |
| CN1756269A (en) * | 2004-10-01 | 2006-04-05 | 居里泰尔通讯株式会社 | Mobile communication terminal equipped with digital image capturing module and method of capturing digital image |
| CN102005931A (en) * | 2010-04-08 | 2011-04-06 | 深圳市航嘉驰源电气股份有限公司 | Forward converter |
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| CN107809595B (en) * | 2017-11-14 | 2018-07-20 | 数海信息技术有限公司 | Mobile intelligent helps shooting system |
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