CN105049742A - Mobile terminal and dual color temperature compensation method - Google Patents
Mobile terminal and dual color temperature compensation method Download PDFInfo
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- CN105049742A CN105049742A CN201510515346.XA CN201510515346A CN105049742A CN 105049742 A CN105049742 A CN 105049742A CN 201510515346 A CN201510515346 A CN 201510515346A CN 105049742 A CN105049742 A CN 105049742A
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Abstract
The invention relates to the technical field of image pickup and discloses a mobile terminal and a dual color temperature compensation method. The mobile terminal comprises a processor, an RGB sensor, a dual color temperature flash lamp, a two-channel driver chip and a camera; the RGB sensor and the camera are connected to the processor, respectively; the two-channel driver chip is connected between the processor and the dual color temperature flash lamp; wherein the processor outputs a two-channel current parameter to the two-channel driver chip according to the environmental color temperature acquired by the RGB sensor; when a shooting command is received by the processor, the processor enables the two-channel driver chip and controls the camera to pick up an image. The mobile terminal is enabled to obtain relatively accurate environmental color temperature, and therefore, during shooting in dark light, the dual color temperature flash lamp is capable of outputting light mote adaptive to the environmental light and the supplementary lighting effect of the dual color temperature flash lamp is enhanced; as a result, the mobile terminal has good color rendition in shooting and then the shooting experience of a user can be enhanced.
Description
Technical field
The present invention relates to camera technique field, particularly a kind of mobile terminal and two color temperature compensating method.
Background technology
Along with the development of science and technology, the use of the mobile imaging equipment such as smart mobile phone is more and more universal, has preferably image taking effect and then can significantly improve the competitiveness of smart mobile phone.Therefore, in recent years, the image taking effect of smart mobile phone etc. is enhanced.
In practical application, all photoflash lamp can be used at a lot of photographed scene.And photoflash lamp also develops into current double-colored temperature photoflash lamp by monochromatic burner in early time.The back of such as some smart mobile phones, the side of camera is provided with two pieces of photoflash lamps, wherein one piece is highlighted WLED (WhiteLightEmittingDiode, white light-emitting diodes, be called for short WLED), coordinate the amber LED warm colour lamp that one piece of brightness is slightly dark, thus reach the effect of color temperature compensating.The imaging effect of double-colored temperature photoflash lamp is softer, and white balance is also more accurate, and the shooting quality of photo in half-light photographed scene is obviously promoted.
In current double-colored temperature photoflash lamp mobile phone, before carrying out lamp pearl and lighting, by camera, this is obtained real-time pictures analysis by software algorithm ambient color temperature value in time carrying out picture preview, mobile phone decides the current parameters needed for each lamp of the two lamp of the changes in temperature that need to flash according to this color temperature value obtained, thus controls driving chip and export corresponding electric current and complete and flash.But, the environment colour temperature error that mobile terminal is obtained by software algorithm is higher, general between 15%-30%, there is comparatively big error equally in the electric current causing mobile phone to control driving chip output, the light that accurate and environment colour temperature adapts cannot be exported, and then cause the light filling effect of double-colored temperature photoflash lamp to make a discount, make the shooting of mobile phone under half-light environment cannot obtain good color rendition, so cause user take experience poor.
Summary of the invention
The object of the present invention is to provide a kind of mobile terminal and two color temperature compensating method, make mobile terminal can obtain comparatively accurate environment colour temperature, thus when half-light is taken, double-colored temperature photoflash lamp can export the light more adapted with ambient light, improve the light filling effect of double-colored temperature photoflash lamp, make the shooting of mobile terminal have preferably color rendition, thus raising user take experience.
For solving the problems of the technologies described above, embodiments of the present invention provide a kind of mobile terminal, comprise: processor, RGB transducer, double-colored temperature photoflash lamp, binary channels driving chip and camera; Described RGB transducer and described camera are connected to described processor; Described binary channels driving chip is connected between described processor and described double-colored temperature photoflash lamp; Wherein, described processor exports binary channels current parameters to described binary channels driving chip according to the environment colour temperature that described RGB transducer gathers; When described processor receives shooting order, the enable described binary channels driving chip of described processor and control described camera photographic images; Wherein, after described binary channels driving chip is enabled, export the binary channels drive current extremely described double-colored temperature photoflash lamp continuing preset duration according to described binary channels current parameters, described camera is photographic images in described preset duration.
Embodiments of the present invention additionally provide a kind of two color temperature compensating method, and be applied to foregoing mobile terminal, this pair of color temperature compensating method comprises following steps: described RGB transducer gathers environment colour temperature; Described processor produces binary channels current parameters according to described environment colour temperature; When receiving shooting order, the enable described binary channels driving chip of described processor and control described camera photographic images; Wherein, after described binary channels driving chip is enabled, export the binary channels drive current extremely described double-colored temperature photoflash lamp continuing preset duration according to described binary channels current parameters, described camera is photographic images in described preset duration.
Embodiment of the present invention in terms of existing technologies, mobile terminal can collect the higher environment colour temperature of precision by RGB transducer, the higher binary channels current parameters of the environment colour temperature output accuracy that processor obtains according to RGB transducer is to binary channels driving chip, when processor receives shooting order, enable binary channels driving chip, binary channels driving chip is made to export the binary channels drive current of lasting preset duration to double-colored temperature photoflash lamp, meanwhile, processor controls camera photographic images in this preset duration.Thus, significantly can improve the light filling effect of the double-colored temperature photoflash lamp of mobile terminal, make mobile terminal have preferably color rendition when half-light is taken, thus the shooting improving user is experienced.
Preferably, described processor comprises processing unit and memory cell, and described memory cell stores environment colour temperature-binary channels current parameters table of comparisons; Wherein, the environment colour temperature that described processing unit gathers according to described RGB transducer, inquires about described environment colour temperature-binary channels current parameters table of comparisons, obtains the binary channels current parameters that described environment colour temperature is corresponding.Thus processor can be inquired about efficiently and export binary channels current parameters to binary channels driving chip, save shooting time, improve Consumer's Experience.
Preferably, described mobile terminal also comprises the first power supply unit and the second power supply unit; Described first power supply unit is connected to described binary channels driving chip; Described second power supply unit is connected to processor, RGB transducer and described camera.First power supply unit is rechargeable battery; Described second power supply unit is the power management chip being connected to described rechargeable battery.Thus powered directly to double-colored temperature photoflash lamp by rechargeable battery, not only power supply circuits are simple, and power supply is stable.
Preferably, described mobile terminal also comprises the flashing lamp lens covering described double-colored temperature photoflash lamp, thus can improve the effect of flashing of photoflash lamp.
Accompanying drawing explanation
Fig. 1 is the structured flowchart according to first embodiment of the invention mobile terminal;
Fig. 2 is the flow chart according to the two color temperature compensating method of second embodiment of the invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, the embodiments of the present invention are explained in detail.But, persons of ordinary skill in the art may appreciate that in each execution mode of the present invention, proposing many ins and outs to make reader understand the application better.But, even without these ins and outs with based on the many variations of following execution mode and amendment, each claim of the application technical scheme required for protection also can be realized.
First execution mode of the present invention relates to a kind of mobile terminal.Specifically, relate to the various mobile terminals with shoot function, such as, smart mobile phone, panel computer etc., but present embodiment does not impose any restrictions for the particular type of mobile terminal.As shown in Figure 1, this mobile terminal comprises: processor, RGB transducer, double-colored temperature photoflash lamp, binary channels driving chip, camera, the first power supply unit and the second power supply unit.Processor comprises processing unit and memory cell, such as, can adopt the processor with high-speed cache.RGB transducer and camera are connected to processing unit.Binary channels driving chip is connected between processing unit and double-colored temperature photoflash lamp.First power supply unit is connected to binary channels driving chip, and the second power supply unit is connected to processor, RGB transducer and camera.
First power supply unit is rechargeable battery, and rechargeable battery such as can adopt lithium battery, soft-package battery lamp etc.Binary channels driving chip is connected between rechargeable battery and double-colored temperature photoflash lamp.Thus binary channels driving chip is comparatively large due to electric current, can directly from the first power supply unit (such as lithium battery) power taking of mobile terminal, thus the power supply of double-colored temperature photoflash lamp can be made more stable.Second power supply unit is the power management chip being connected to rechargeable battery, thus provides stable power supply for camera, processor and RGB sensor.
In actual applications, RGB transducer is installed on the side of mobile terminal post-positioned pick-up head, and double-colored temperature photoflash lamp is positioned at post-positioned pick-up head opposite side.But present embodiment does not do concrete restriction for the relative position of RGB transducer and double-colored temperature photoflash lamp.Double-colored temperature photoflash lamp such as comprises one piece of highlighted WLED and a piece of amber warm light LED, but present embodiment does not impose any restrictions for the particular type of double-colored temperature photoflash lamp.In addition, mobile terminal also comprises the flashing lamp lens covering double-colored temperature photoflash lamp, and double-colored temperature photoflash lamp coordinates flashing lamp lens to flash better.RGB transducer more accurately can detect the color temperature value of surround lighting, and the whether accurate effect that directly can have influence on later stage imaging of color temperature value.Such as, in certain photographed scene, recording environment colour temperature by special instrument is 3700K, recording environment colour temperature by main flow high-end smartphones is about 3000K, error is about 20%, and be about 3600K by the environment colour temperature that RGB transducer records, visible, more accurate by using RGB transducer to gather environment colour temperature.
The ambient color temperature value that processing unit then gathers according to RGB transducer exports binary channels current parameters to binary channels driving chip.Particularly, memory cell stores environment colour temperature-binary channels current parameters table of comparisons.The environment colour temperature that processing unit gathers according to RGB transducer, inquiry environment colour temperature-binary channels current parameters table of comparisons, obtains the binary channels current parameters that environment colour temperature is corresponding, and the binary channels current parameters of acquisition is transferred to binary channels driving chip.
Environment colour temperature-binary channels current parameters table of comparisons can obtain in the following way.Changes in temperature lamp for concrete specification combines, the two lamp current of many groups can be set in optical laboratory by DC power supply and export the two color temperature lamp of driving changes in temperature respectively, and coordinate selected flashlight lens polishing, use professional colour temperature tester to measure the color temperature value of actual polishing.Such as, cold lamp current is from 100mA to 1000mA, and warm lamp current, from 1000mA to 100mA, is a unit with 10mA respectively, records the color temperature value under many group currents combination, can obtain two lamp currents-colour temperature table of comparisons as shown in table 1.In practical application, in order to obtain comparatively accurate color temperature value, current precision can be improved further, thus improving the precision of the color temperature value determined.Present embodiment is not restricted for the precision of color temperature value.
In practice, when meeting required precision, in order to reduce the data processing amount of processing unit, when environmentally colour temperature searches target colour temperature corresponding in memory cell to processing unit, when processing unit judges the ambient color temperature value of RGB transducer collection and the difference of a certain aim colour temperature value is less than preset difference value, processing unit can export binary channels current parameters corresponding for this aim colour temperature value to binary channels driving chip.Such as, when the ambient color temperature value of RGB transducer collection is 2420K, the difference of the aim colour temperature value 2410K that processing unit calculates in this ambient color temperature value 2420K and table 1 is 10, be less than preset difference value 40, then now processing unit exports binary channels current parameters corresponding to this aim colour temperature value 2410K to binary channels driving chip, i.e. cold lamp current 120mA, warm lamp current 980mA.
Or, in advance the color temperature value in table 1 can be set to range of color temperature, such as, color temperature value 2410K be set to 2370 ~ 2450 (i.e. 2410K ± 40).Now, processing unit directly judges that the ambient color temperature value of RGB transducer collection belongs to certain range of color temperature, exports binary channels current parameters corresponding to this range of color temperature to binary channels driving chip.
Table 1
| Cold lamp (WLED) electric current | Warm lamp (amber LED) electric current | Colour temperature |
| 1000mA | 100mA | 6500K |
| 990mA | 110mA | 6456K |
| 980mA | 120mA | 6412K |
| … | … | … |
| … | … | … |
| 120mA | 980mA | 2410K |
| 110mA | 990mA | 2455K |
| 100mA | 1000mA | 2500K |
The workflow of present embodiment is as follows: open application of taking pictures, environment colour temperature-binary channels current parameters table of comparisons is loaded on internal storage location by processing unit, simultaneously enable RGB transducer.RGB transducer obtains the ambient color temperature value of present filming scene and is sent to processing unit.Processing unit, according to the environment colour temperature-binary channels current parameters table of comparisons in the ambient color temperature value inquiry memory cell received, obtains the binary channels current parameters corresponding with current environment color temperature value.Such as, or processing unit also can directly from exterior storage medium, and high-speed internal memory card etc. read and inquire about and obtain the binary channels current parameters corresponding with current ambient color temperature value.Processing unit is delivered to binary channels driving chip by serial data bus by inquiring about the binary channels current parameters obtained.When processing unit receive user trigger the shooting instruction of generation time, processing unit is by the enable binary channels driving chip of GPIO control signal wire, the double-colored temperature photoflash lamp of binary channels current drives controlling the lasting preset duration of binary channels driving chip output flashes, meanwhile, processing unit controls post-positioned pick-up head and complete shooting in this preset duration.Or, processing unit also can when receiving the shooting instruction that user sends, the binary channels current parameters of acquisition is delivered to binary channels driving chip and controls binary channels driving chip and export and continue the double-colored temperature photoflash lamp of binary channels current drives of preset duration and flash, meanwhile, processing unit controls post-positioned pick-up head and complete shooting in this preset duration.
Therefore, present embodiment in terms of existing technologies, mobile terminal obtains comparatively accurate ambient color temperature value by adopting RGB transducer, and controls binary channels driving chip according to the ambient color temperature value that RGB transducer obtains and drive double-colored temperature photoflash lamp to have flashed shooting.Because the Acquisition Error of surround lighting colour temperature reduces greatly, make mobile terminal have good light filling effect, thus when half-light is taken, preferably color rendition can be obtained, and then the shooting improving user is experienced.
It is worth mentioning that, each module involved in present embodiment is logic module, and in actual applications, a logical block can be a physical location, also can be a part for a physical location, can also realize with the combination of multiple physical location.In addition, in order to outstanding innovative part of the present invention, the unit not too close with solving technical problem relation proposed by the invention is not introduced in present embodiment, but this does not show the unit that there is not other in present embodiment.
Second execution mode of the present invention relates to a kind of two color temperature compensating method.This pair of color temperature compensating method is applied to mobile terminal as described in the first embodiment, and idiographic flow as shown in Figure 2, comprises following steps:
Step 201:RGB transducer gathers environment colour temperature.
Step 202: processor environmentally colour temperature produces binary channels current parameters.
Particularly, processor is colour temperature environmentally, inquires about the environment colour temperature-binary channels current parameters table of comparisons prestored in this processor, obtains the binary channels current parameters that environment colour temperature is corresponding.
Step 203: when receiving shooting order, the enable binary channels driving chip of processor and control camera photographic images.
After binary channels driving chip is enabled, export the binary channels drive current extremely double-colored temperature photoflash lamp continuing preset duration according to binary channels current parameters, camera is photographic images in preset duration.
The step of various method divides above, just in order to be described clearly, can merge into a step or splitting some step, being decomposed into multiple step, when realizing as long as comprise identical logical relation, all in the protection range of this patent; To adding inessential amendment in algorithm or in flow process or introducing inessential design, but the core design not changing its algorithm and flow process is all in the protection range of this patent.
Be not difficult to find, present embodiment is the embodiment of the method corresponding with the first execution mode, and present embodiment can be worked in coordination with the first execution mode and be implemented.The relevant technical details mentioned in first execution mode is still effective in the present embodiment, in order to reduce repetition, repeats no more here.Correspondingly, the relevant technical details mentioned in present embodiment also can be applicable in the first execution mode.
Persons of ordinary skill in the art may appreciate that the respective embodiments described above realize specific embodiments of the invention, and in actual applications, various change can be done to it in the form and details, and without departing from the spirit and scope of the present invention.
Claims (8)
1. a mobile terminal, is characterized in that, comprises: processor, RGB transducer, double-colored temperature photoflash lamp, binary channels driving chip and camera;
Described RGB transducer and described camera are connected to described processor;
Described binary channels driving chip is connected between described processor and described double-colored temperature photoflash lamp;
Wherein, described processor exports binary channels current parameters to described binary channels driving chip according to the environment colour temperature that described RGB transducer gathers;
When described processor receives shooting order, the enable described binary channels driving chip of described processor and control described camera photographic images; Wherein, after described binary channels driving chip is enabled, export the binary channels drive current extremely described double-colored temperature photoflash lamp continuing preset duration according to described binary channels current parameters, described camera is photographic images in described preset duration.
2. mobile terminal according to claim 1, is characterized in that, described processor comprises processing unit and memory cell, and described memory cell stores environment colour temperature-binary channels current parameters table of comparisons;
Wherein, the environment colour temperature that described processing unit gathers according to described RGB transducer, inquires about described environment colour temperature-binary channels current parameters table of comparisons, obtains the binary channels current parameters that described environment colour temperature is corresponding.
3. mobile terminal according to claim 1, is characterized in that, described mobile terminal also comprises the first power supply unit and the second power supply unit;
Described first power supply unit is connected to described binary channels driving chip;
Described second power supply unit is connected to processor, RGB transducer and described camera.
4. mobile terminal according to claim 3, is characterized in that, described first power supply unit is rechargeable battery; Described second power supply unit is the power management chip being connected to described rechargeable battery.
5. mobile terminal according to claim 1, is characterized in that, described camera is post-positioned pick-up head.
6. mobile terminal according to claim 1, is characterized in that, described mobile terminal also comprises the flashing lamp lens covering described double-colored temperature photoflash lamp.
7. a two color temperature compensating method, it is characterized in that, be applied to the mobile terminal in claim 1 to 6 described in any one, described pair of color temperature compensating method comprises following steps:
Described RGB transducer gathers environment colour temperature;
Described processor produces binary channels current parameters according to described environment colour temperature;
When receiving shooting order, the enable described binary channels driving chip of described processor and control described camera photographic images; Wherein, after described binary channels driving chip is enabled, export the binary channels drive current extremely described double-colored temperature photoflash lamp continuing preset duration according to described binary channels current parameters, described camera is photographic images in described preset duration.
8. according to claim 7 pair of color temperature compensating method, is characterized in that, produces in the step of binary channels current parameters at described processor according to described environment colour temperature,
Described processor, according to described environment colour temperature, is inquired about the environment colour temperature-binary channels current parameters table of comparisons prestored in this processor, is obtained the binary channels current parameters that described environment colour temperature is corresponding.
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Application publication date: 20151111 |
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