CN109286808A - White balance calibration method and device - Google Patents
White balance calibration method and device Download PDFInfo
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- CN109286808A CN109286808A CN201710601900.5A CN201710601900A CN109286808A CN 109286808 A CN109286808 A CN 109286808A CN 201710601900 A CN201710601900 A CN 201710601900A CN 109286808 A CN109286808 A CN 109286808A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
- H04N17/002—Diagnosis, testing or measuring for television systems or their details for television cameras
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
- H04N17/02—Diagnosis, testing or measuring for television systems or their details for colour television signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/80—Camera processing pipelines; Components thereof
- H04N23/84—Camera processing pipelines; Components thereof for processing colour signals
- H04N23/88—Camera processing pipelines; Components thereof for processing colour signals for colour balance, e.g. white-balance circuits or colour temperature control
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- Color Television Image Signal Generators (AREA)
Abstract
The disclosure is directed to a kind of white balance calibration method and devices, to improve the accuracy of white balance calibration.White balance calibration device includes: the light of first the first colour temperature of flash light emission；The light of second the second colour temperature of flash light emission；The light of third flash light emission third colour temperature；The light of first colour temperature, the light of the second colour temperature, third colour temperature light in color space respectively correspond to the first colour temperature coordinate, the second colour temperature coordinate, third colour temperature coordinate, and using the first colour temperature coordinate, the second colour temperature coordinate, third colour temperature coordinate as vertex triangle cover white balance calibration gray area；Sensors sense environmental light；Environment light corresponds to the 4th colour temperature coordinate；Control module according between the first colour temperature coordinate, the second colour temperature coordinate, third colour temperature coordinate, the 4th colour temperature coordinate positional relationship control the light of the first colour temperature, the light of the second colour temperature, third colour temperature light formed mixed light colour temperature close to environment light colour temperature.The accuracy of white balance calibration can be improved in the technical solution of the disclosure.
Description
Technical field
This disclosure relates to technical field of image processing more particularly to a kind of white balance calibration method and device.
Background technique
In the related technology, the flash lamp that the capturing apparatus of image uses is usually monochromatic warm flash lamp or the flash of light of double-colored temperature
Lamp carries out light filling when absorbing image, carries out white balance calibration, improves the colour cast phenomenon of intake image, weakens intake image and loses
Very.Wherein, more acurrate using double-colored temperature flash lamp progress white balance calibration.
However, the drawbacks of carrying out white balance calibration using double-colored temperature flash lamp is: can only determine two in color space
A different coordinate value；The straight line of connection two o'clock cannot cover the gray area of entire white balance calibration, therefore be glistened using double-colored temperature
Lamp, which is taken pictures, will have white balance misjudgment.
Summary of the invention
To overcome the problems in correlation technique, the embodiment of the present disclosure provides a kind of white balance calibration method and device,
To improve the accuracy of white balance calibration.
According to the first aspect of the embodiments of the present disclosure, a kind of white balance calibration device is provided, described device includes: the first sudden strain of a muscle
Light lamp, the second flash lamp, third flash lamp, sensor and control module；
First flash lamp, for emitting the light of the first colour temperature；The light of first colour temperature is corresponding in color space
First colour temperature coordinate；
Second flash lamp, for emitting the light of the second colour temperature；The light of second colour temperature is in the color space
Corresponding second colour temperature coordinate；
The third flash lamp, for emitting the light of third colour temperature；The light of the third colour temperature is in the color space
Corresponding third colour temperature coordinate, and using the first colour temperature coordinate, the second colour temperature coordinate, the third colour temperature coordinate as vertex
Triangle covering white balance calibration gray area；
The sensor, for detecting environment light；The environment light corresponding 4th colour temperature coordinate in the color space；
The 4th colour temperature coordinate is located at the gray area；
The control module, for being sat according to the first colour temperature coordinate, the second colour temperature coordinate, the third colour temperature
Be marked with and the 4th colour temperature coordinate between positional relationship, determine the light of first colour temperature, the light of second colour temperature, institute
The light of third colour temperature is stated respectively to the weighing factor of the environment light, and first flash of light is determined according to respective weighing factor
Lamp, second flash lamp, the corresponding driving current of third flash lamp, are adjusted by corresponding driving current
The colour temperature for the mixed light that the light of the light of first colour temperature, the light of second colour temperature and the third colour temperature is formed, makes institute
The colour temperature of mixed light is stated close to the colour temperature of the environment light.
In one embodiment, the driving current of first flash lamp can be by the light of first colour temperature to the environment light
Weighing factor and first flash lamp maximum current value determine；
The driving current of second flash lamp can by second colour temperature light to the weighing factor of the environment light with
The maximum current value determines；
The driving current of the third flash lamp can by the third colour temperature light to the weighing factor of the environment light with
The maximum current value determines.
In one embodiment, the light of first colour temperature can be by the first ratio and second to the weighing factor of the environment light
Ratio determine, wherein first ratio be equal to the distance between the second colour temperature coordinate and the 5th colour temperature coordinate with
The ratio between the distance between described first colour temperature coordinate and the second colour temperature coordinate；The 5th colour temperature coordinate is the third color
The extended line and the first colour temperature coordinate of the line of warm coordinate and the 4th colour temperature coordinate and the second colour temperature coordinate connect
The coordinate of the intersection point of line；
The light of second colour temperature can determine the weighing factor of the environment light by third ratio and the second ratio,
In, the third ratio is equal to the distance between the first colour temperature coordinate and the 5th colour temperature coordinate and first colour temperature
The ratio between the distance between coordinate and the second colour temperature coordinate；
The light of the third colour temperature can be by the 5th colour temperature coordinate and the described 4th to the weighing factor of the environment light
The distance between colour temperature coordinate is determined with the distance between the third colour temperature coordinate and the 5th colour temperature coordinate.
In one embodiment, the wave-length coverage of the light of first colour temperature can be 566 nanometers~569 nanometers, described second
The colour temperature of the light of colour temperature can be 8427K, and the wave-length coverage of the light of the third colour temperature can be 588 nanometers~592 nanometers.
According to the second aspect of an embodiment of the present disclosure, a kind of white balance calibration method is provided, applied to above-mentioned white balance
On calibrating installation, the white balance calibration device include the first flash lamp, the second flash lamp, third flash lamp, sensor and
Control module；Wherein, first flash lamp is used to emit the light of the first colour temperature；The light of first colour temperature is in color space
The corresponding first colour temperature coordinate；Second flash lamp is used to emit the light of the second colour temperature；The light of second colour temperature is in institute
It states and corresponds to the second colour temperature coordinate in color space；The third flash lamp is used to emit the light of third colour temperature；The third
The light of colour temperature corresponds to the third colour temperature coordinate in the color space, and with the first colour temperature coordinate, second color
Warm coordinate, the triangle that the third colour temperature coordinate is vertex cover the gray area of white balance calibration；
The white balance calibration method, comprising:
The sensors sense environmental light；The environment light corresponding 4th colour temperature coordinate in the color space；It is described
4th colour temperature coordinate is located at the gray area；
The control module according to the first colour temperature coordinate, the second colour temperature coordinate, the third colour temperature coordinate with
And the positional relationship between the 4th colour temperature coordinate, determine the light of first colour temperature, the light of second colour temperature, described
The light of three colour temperatures respectively to the weighing factor of the environment light, and according to respective weighing factor determine first flash lamp,
Second flash lamp, the corresponding driving current of third flash lamp adjust institute by corresponding driving current
The colour temperature for stating the mixed light of the light formation of the light of the first colour temperature, the light of second colour temperature and the third colour temperature, makes described
Colour temperature of the colour temperature of mixed light close to the environment light.
In one embodiment, the driving current of first flash lamp can be by the light of first colour temperature to the environment light
Weighing factor and first flash lamp maximum current value determine；
The driving current of second flash lamp can by second colour temperature light to the weighing factor of the environment light with
The maximum current value determines；
The driving current of the third flash lamp can by the third colour temperature light to the weighing factor of the environment light with
The maximum current value determines.
In one embodiment, the light of first colour temperature can be by the first ratio and second to the weighing factor of the environment light
Ratio determine, wherein first ratio be equal to the distance between the second colour temperature coordinate and the 5th colour temperature coordinate with
The ratio between the distance between described first colour temperature coordinate and the second colour temperature coordinate；The 5th colour temperature coordinate is the third color
The extended line and the first colour temperature coordinate of the line of warm coordinate and the 4th colour temperature coordinate and the second colour temperature coordinate connect
The coordinate of the intersection point of line；
The light of second colour temperature can determine the weighing factor of the environment light by third ratio and the second ratio,
In, the third ratio is equal to the distance between the first colour temperature coordinate and the 5th colour temperature coordinate and first colour temperature
The ratio between the distance between coordinate and the second colour temperature coordinate；
The light of the third colour temperature can be by the 5th colour temperature coordinate and the described 4th to the weighing factor of the environment light
The distance between colour temperature coordinate is determined with the distance between the third colour temperature coordinate and the 5th colour temperature coordinate.
In one embodiment, the wave-length coverage of the light of first colour temperature can be 566 nanometers~569 nanometers, described second
The colour temperature of the light of colour temperature can be 8427K, and the wave-length coverage of the light of the third colour temperature can be 588 nanometers~592 nanometers.
According to the third aspect of an embodiment of the present disclosure, a kind of white balance calibration device, the white balance calibration device are provided
Including the first flash lamp, the second flash lamp, third flash lamp and sensor；Wherein, first flash lamp is for emitting the
The light of color temperature；The light of first colour temperature corresponds to the first colour temperature coordinate in color space；Second flash lamp is used
In the light for emitting the second colour temperature；The light of second colour temperature corresponds to the second colour temperature coordinate in the color space；It is described
Third flash lamp is used to emit the light of third colour temperature；The light of the third colour temperature corresponds to the third color in the color space
Warm coordinate, and covered using the first colour temperature coordinate, the second colour temperature coordinate, the third colour temperature coordinate as the triangle on vertex
The gray area of lid white balance calibration；The sensor is for detecting environment light；The environment light is corresponding the in the color space
Four colour temperature coordinates；The 4th colour temperature coordinate is located at the gray area；
Described device further include:
Processor；
Memory for storage processor executable instruction；
Wherein, the processor is configured to:
According to the first colour temperature coordinate, the second colour temperature coordinate, the third colour temperature coordinate and the 4th color
Positional relationship between warm coordinate determines that the light of first colour temperature, the light of second colour temperature, the light of the third colour temperature are each
First flash lamp, second flash of light are determined from the weighing factor to the environment light, and according to respective weighing factor
Lamp, the corresponding driving current of third flash lamp, adjust first colour temperature by corresponding driving current
The colour temperature for the mixed light that the light of light, the light of second colour temperature and the third colour temperature is formed, makes the colour temperature of the mixed light
Close to the colour temperature of the environment light.
The technical scheme provided by this disclosed embodiment can include the following benefits: in color space, with first
The corresponding first colour temperature coordinate of flash lamp, the corresponding second colour temperature coordinate of the second flash lamp, the corresponding third color of third flash lamp
Warm coordinate is that the triangle on vertex covers the gray area of white balance calibration, and the corresponding 4th colour temperature coordinate of environment light is located at the gray area,
It can according to positional relationship of the 4th colour temperature coordinate respectively between the first colour temperature coordinate, the second colour temperature coordinate, third colour temperature coordinate
With determine the light of the first colour temperature, the light of the second colour temperature, third colour temperature light respectively to the weighing factor of environment light, according to the first color
Light, the light of the second colour temperature, the light of third colour temperature of temperature can determine the first flash lamp, second to the respective weighing factor of environment light
Flash lamp, the corresponding driving current of third flash lamp pass through adjustable first colour temperature of corresponding driving current
The colour temperature for the mixed light that the light of light, the light of the second colour temperature and third colour temperature is formed, makes the colour temperature of above-mentioned mixed light close to ring
The colour temperature of border light.When the colour temperature for the mixed light that the light of the first flash lamp, the second flash lamp, third flash light emission is formed is close to ring
When the colour temperature of border light, white balance calibration exactness can be improved.
It should be understood that above general description and following detailed description be only it is exemplary and explanatory, not
The disclosure can be limited.
Detailed description of the invention
The drawings herein are incorporated into the specification and forms part of this specification, and shows and meets implementation of the invention
Example, and be used to explain the principle of the present invention together with specification.
Fig. 1 a is the block diagram of white balance calibration device shown according to an exemplary embodiment.
Fig. 1 b is the application scenarios schematic diagram of white balance calibration device shown according to an exemplary embodiment.
Fig. 1 c is the application scenarios schematic diagram of the white balance calibration device shown according to a further exemplary embodiment.
Fig. 1 d is the application scenarios schematic diagram of the white balance calibration device shown according to a further exemplary embodiment.
Fig. 1 e is the application scenarios schematic diagram of the white balance calibration device shown according to a further exemplary embodiment.
Fig. 1 f is the application scenarios schematic diagram of the white balance calibration device shown according to a further exemplary embodiment.
Fig. 1 g is the application scenarios schematic diagram of the white balance calibration device shown according to a further exemplary embodiment.
Fig. 2 is white balance calibration schematic diagram shown according to an exemplary embodiment.
Fig. 3 is the flash lamp and white balance calibration curve of white balance calibration device shown according to an exemplary embodiment
Relation schematic diagram.
Fig. 4 is a kind of flow chart of white balance calibration method shown according to an exemplary embodiment.
Fig. 5 is a kind of block diagram of white balance calibration device shown according to an exemplary embodiment.
Specific embodiment
Example embodiments are described in detail here, and the example is illustrated in the accompanying drawings.Following description is related to
When attached drawing, unless otherwise indicated, the same numbers in different drawings indicate the same or similar elements.Following exemplary embodiment
Described in embodiment do not represent all embodiments consistented with the present invention.On the contrary, they be only with it is such as appended
The example of device and method being described in detail in claims, some aspects of the invention are consistent.
Fig. 1 a is the block diagram of white balance calibration device shown according to an exemplary embodiment, and Fig. 1 b is exemplary according to one
Implement the application scenarios schematic diagram of the white balance calibration device exemplified；Fig. 1 c be show according to a further exemplary embodiment it is white
The application scenarios schematic diagram of balance correction device；Fig. 1 d is the white balance calibration device shown according to a further exemplary embodiment
Application scenarios schematic diagram；Fig. 1 e is the application scenarios signal of the white balance calibration device shown according to a further exemplary embodiment
Figure；Fig. 1 f is the application scenarios schematic diagram of the white balance calibration device shown according to a further exemplary embodiment；Fig. 1 g is basis
The application scenarios schematic diagram of white balance calibration device shown in another exemplary embodiment；The white balance calibration device can be applied
On the terminal device (such as: smart phone, tablet computer, camera) for having camera function, to improve white balance calibration
Accuracy, as shown in Figure 1a, the white balance calibration device, comprising: the first flash lamp 11, the second flash lamp 12, third flash of light
Lamp 13, sensor 14 and control module 15.Wherein,
First flash lamp 11, for emitting the light of the first colour temperature；The light of first colour temperature corresponding first color in color space
Warm coordinate.Second flash lamp 12, for emitting the light of the second colour temperature；The light of second colour temperature corresponding second colour temperature in color space
Coordinate.Third flash lamp 13, for emitting the light of third colour temperature；The light of third colour temperature corresponds to third colour temperature seat in color space
Mark, and using the first colour temperature coordinate, the second colour temperature coordinate, third colour temperature coordinate as the ash of the triangle on vertex covering white balance calibration
Area.
In one embodiment, the light of the first colour temperature can be yellow-green light, and wave-length coverage is 566 nanometers~569 nanometers,
The light of second colour temperature can be blue and white light, and colour temperature is 8427K (Kelvin), and the light of third colour temperature can be orange-red light, wave
Long range is 588 nanometers~592 nanometers.
Sensor 14, for detecting environment light；Environment light corresponding 4th colour temperature coordinate in color space；4th colour temperature is sat
Mark is in gray area.
In one embodiment, sensor 14 can be photoelectric sensor, the ambient light signal conversion for will test
For electric signal, and it is sent to control module 15, control module 15 can determine that environment light is right in color space according to electric signal
The 4th colour temperature coordinate answered.
Control module 15, for according to the first colour temperature coordinate, the second colour temperature coordinate, third colour temperature coordinate and the 4th colour temperature
Positional relationship between coordinate, determine the light of the first colour temperature, the light of the second colour temperature, third colour temperature light respectively to the shadow of environment light
Weight is rung, and the first flash lamp, the second flash lamp, the corresponding driving of third flash lamp are determined according to respective weighing factor
Electric current is formed by light, the light of the second colour temperature and the light of third colour temperature that corresponding driving current adjusts the first colour temperature
Mixed light colour temperature, make the colour temperature of mixed light close to the colour temperature of environment light.
In one embodiment, control module 15 can be sat according to the first colour temperature coordinate, the second colour temperature coordinate, third colour temperature
Mark respectively with the 4th colour temperature coordinate the distance between, determine that the light of the first colour temperature, the light of the second colour temperature, the light of third colour temperature are each
From the weighing factor to environment light.
Property scene as an example, as shown in Figure 1 b, white balance calibration device can be applied to smart phone 10, the intelligence
Energy mobile phone 10 has a camera 16, the first flash lamp 11, the second flash lamp 12, third flash lamp 13, sensor 14 and (does not show
Out) and 15 (not shown) of control module, wherein the first flash lamp 11, the second flash lamp 12, third flash lamp 13 are located at camera shooting
First 16 side is simultaneously arranged along the longitudinal direction of smart phone 10, when taking pictures or imaging using camera 16, can open the
One flash lamp 11, the second flash lamp 12, third flash lamp 13 are used for white balance calibration.As another exemplary scene, such as scheme
Shown in 1c, the first flash lamp 11, the second flash lamp 12, third flash lamp 13 are located at 16 lower section of camera, and along smart phone 10
Short side direction arrangement.
As another exemplary scene, as shown in Figure 1 d, which has the flash of light of two cameras 16, first
Lamp 11, the second flash lamp 12,15 (not shown) of third flash lamp 13,14 (not shown) of sensor and control module, wherein two
A camera 16 is arranged along the longitudinal direction of smart phone 10, the first flash lamp 11, the second flash lamp 12,13, third flash lamp
It is arranged in two 16 sides of camera and along the longitudinal direction of smart phone 10.As another exemplary scene, such as Fig. 1 e institute
Show, the first flash lamp 11, the second flash lamp 12, third flash lamp 13 are located at two cameras, 16 lower section, and along smart phone 10
Short side direction arrangement.As another exemplary scene, as shown in Figure 1 f, the first flash lamp 11, the second flash lamp 12, third
Flash lamp 13 is located at two cameras, 16 lower section, and arranges in isosceles triangle.As another exemplary scene, as shown in Figure 1 g,
First flash lamp 11, the second flash lamp 12, third flash lamp 13 are located at the side of two cameras 16, and arrange in isosceles triangle.
In embodiments herein, due to the provision of the flash lamp of three different-colours, and in color space, with first
The corresponding first colour temperature coordinate of flash lamp, the corresponding second colour temperature coordinate of the second flash lamp, the corresponding third color of third flash lamp
Warm coordinate is that the triangle on vertex covers the gray area of white balance calibration, and the corresponding 4th colour temperature coordinate of environment light is located at the gray area,
It is true according to positional relationship of the 4th colour temperature coordinate respectively between the first colour temperature coordinate, the second colour temperature coordinate, third colour temperature coordinate
The fixed light of first colour temperature, the light of the second colour temperature, third colour temperature light respectively to the weighing factor of environment light, according to the first colour temperature
Light, the light of the second colour temperature, third colour temperature light to the respective weighing factor of environment light determine the first flash lamp, the second flash lamp,
The corresponding driving current of third flash lamp adjusts light, the second colour temperature of the first colour temperature by corresponding driving current
Light and third colour temperature light formed mixed light colour temperature, make the colour temperature of above-mentioned mixed light close to the colour temperature of environment light.
When the first flash lamp, the second flash lamp, third flash light emission light formed mixed light colour temperature close to environment light colour temperature
When, white balance calibration exactness can be improved.
In one embodiment, the driving current of the first flash lamp is by the light of the first colour temperature to the weighing factor of environment light and
The maximum current value of one flash lamp determines；
The driving current of second flash lamp determines the weighing factor and maximum current value of environment light by the light of the second colour temperature；
The driving current of third flash lamp determines the weighing factor and maximum current value of environment light by the light of third colour temperature.
In one embodiment, the light of the first colour temperature is determined the weighing factor of environment light by the first ratio and the second ratio,
Wherein, the first ratio is equal to the distance between the second colour temperature coordinate and the 5th colour temperature coordinate and the first colour temperature coordinate and the second colour temperature
The ratio between the distance between coordinate；5th colour temperature coordinate is the extended line and the of the line of third colour temperature coordinate and the 4th colour temperature coordinate
The coordinate of the intersection point of color temperature coordinate and the second colour temperature coordinate line；
The light of second colour temperature is determined the weighing factor of environment light by third ratio and the second ratio, wherein third ratio
Equal to the distance between the first colour temperature coordinate and the 5th colour temperature coordinate between the first colour temperature coordinate and the second colour temperature coordinate away from
The ratio between from；
The light of third colour temperature is to the weighing factor of environment light by the distance between the 5th colour temperature coordinate and the 4th colour temperature coordinate
It is determined with the distance between third colour temperature coordinate and the 5th colour temperature coordinate.
In one embodiment, the wave-length coverage of the light of the first colour temperature is 566 nanometers~569 nanometers, the light of the second colour temperature
Colour temperature is 8427K, and the wave-length coverage of the light of third colour temperature is 588 nanometers~592 nanometers.
Specifically how white balance is calibrated, please refers to subsequent embodiment.
So far, the above-mentioned apparatus that the embodiment of the present disclosure provides, due to the provision of the flash lamp of three different-colours, and in color
In color space, with the corresponding first colour temperature coordinate of the first flash lamp, the corresponding second colour temperature coordinate of the second flash lamp, third flash of light
The corresponding third colour temperature coordinate of lamp is that the triangle on vertex covers the gray area of white balance calibration, and corresponding 4th colour temperature of environment light is sat
Mark is in the gray area, according to the 4th colour temperature coordinate respectively between the first colour temperature coordinate, the second colour temperature coordinate, third colour temperature coordinate
Positional relationship determine the light of the first colour temperature, the light of the second colour temperature, third colour temperature light respectively to the weighing factor of environment light, root
According to the light of the first colour temperature, the light of the second colour temperature, third colour temperature light to the respective weighing factor of environment light determine the first flash lamp,
Second flash lamp, the corresponding driving current of third flash lamp adjust the first colour temperature by corresponding driving current
The colour temperature for the mixed light that the light of light, the light of the second colour temperature and third colour temperature is formed, makes the colour temperature of above-mentioned mixed light close to ring
The colour temperature of border light.When the colour temperature for the mixed light that the light of the first flash lamp, the second flash lamp, third flash light emission is formed is close to ring
When the colour temperature of border light, white balance calibration exactness can be improved.
The technical solution of embodiment of the present disclosure offer is provided below with specific embodiment.
Fig. 2 is white balance calibration schematic diagram shown according to an exemplary embodiment；Fig. 3 is according to an exemplary embodiment
The flash lamp of the white balance calibration device shown and the relation schematic diagram of white balance calibration curve, the present embodiment are real using the application
Apply example offer above-mentioned apparatus, with determined in rgb color space the light of the first colour temperature, the light of the second colour temperature, third colour temperature light
Respectively the weighing factor of environment light is illustrated, as shown in Fig. 2, in the coordinate system of rgb color space,
The light of first colour temperature corresponding first colour temperature coordinate in color space is A, and the light of the second colour temperature is in color space
In corresponding second colour temperature coordinate be B, the light of third colour temperature in color space corresponding third colour temperature coordinate be C, environment light
Corresponding 4th colour temperature coordinate is E in color space.Wherein, the horizontal axis of coordinate system is the ratio of red component and green component,
The longitudinal axis is the ratio of blue component and green component.
In one embodiment, the driving current of the first flash lamp by the first colour temperature light to the weighing factor of environment light with
The maximum current value of first flash lamp determines；Influence power of the driving current of second flash lamp by the light of the second colour temperature to environment light
Weight is determined with maximum current value；The driving current of third flash lamp is by the light of third colour temperature to the weighing factor of environment light and maximum
Current value determines.In one exemplary embodiment, the driving current of the first flash lamp is equal to the light of the first colour temperature to environment light
Weighing factor and the first flash lamp maximum current value product；The driving current of second flash lamp is equal to the light of the second colour temperature
The product of the maximum current value of weighing factor and the second flash lamp to environment light；The driving current of third flash lamp is equal to third
Product of the light of colour temperature to the weighing factor of environment light and the maximum current value of third flash lamp.Wherein, the first flash lamp is most
The maximum current value of high current value, the maximum current value of the second flash lamp and third flash lamp is identical.
In one embodiment, the light of the first colour temperature is true by the first ratio and the second ratio to the weighing factor of environment light
It is fixed, wherein the first ratio is equal to the distance between the second colour temperature coordinate B and the 5th colour temperature coordinate D and the first colour temperature coordinate A and the
The ratio between the distance between two colour temperature coordinate B；5th colour temperature coordinate D is the line of third colour temperature coordinate C and the 4th colour temperature coordinate E
The coordinate of the intersection point of extended line and the first colour temperature coordinate A and the second colour temperature coordinate B line；Shadow of the light of second colour temperature to environment light
It rings weight to be determined by third ratio and the second ratio, wherein third ratio is equal to the first colour temperature coordinate A and the 5th colour temperature coordinate D
The distance between the ratio between with the distance between the first colour temperature coordinate A and the second colour temperature coordinate B；The light of third colour temperature is to environment light
Weighing factor is by the distance between the 5th colour temperature coordinate D and the 4th colour temperature coordinate E and third colour temperature coordinate C and the 5th colour temperature coordinate
The distance between D is determined.In one exemplary embodiment, the light of the first colour temperature is equal to the first ratio to the weighing factor of environment light
Value and the product of the second ratio, the light of the second colour temperature are equal to multiplying for third ratio and the second ratio to the weighing factor of environment light
Product, the light of third colour temperature to the weighing factor of environment light be equal to the distance between the 5th colour temperature coordinate D and the 4th colour temperature coordinate E with
The ratio between the distance between third colour temperature coordinate C and the 5th colour temperature coordinate D.
Below with reference to Fig. 2 introduction, how control module 15 determines the light of the first colour temperature to ring in one exemplary embodiment
The weighing factor of border light, the second colour temperature light to the weighing factor of environment light and the light of third colour temperature to environment light influence power
Weight.
Tie point C and point E, and extend line segment CE, D point is intersected at line segment AB.According to the first colour temperature coordinate A, the second color
Warm coordinate B, third colour temperature coordinate C, the 4th colour temperature coordinate E, the 5th colour temperature coordinate D, are calculated AD, AB, BD, DE, CE, CD
Line segment length.
According toThe light of available first colour temperature for the 5th colour temperature coordinate D weighing factor, according toIt can obtain
Light to the second colour temperature similarly can basis for the weighing factor of the 5th colour temperature coordinate DThe light of third colour temperature is obtained to
The weighing factor of four colour temperature coordinate E, i.e. weighing factor of the light of third colour temperature to environment light.
And so on, the light that can find out the first colour temperature is to the weighing factor of environment lightSecond colour temperature
Light is to the weighing factor of environment light
In one exemplary embodiment, control module 15 can determine the driving electricity of the first flash lamp according to the following formula
Flow I1, the second flash lamp driving current I2, third flash lamp driving current I3
Wherein, ImaxFor the maximum current of the first flash lamp.
Control module 15 is adjusted to I according to above-mentioned calculated result, by the driving current of the first flash lamp1, by second dodge
The driving current of light lamp is adjusted to I2, the driving current of third flash lamp is adjusted to I3, in this way, the of the first flash light emission
The light of the third colour temperature of the light of color temperature, the light of the second colour temperature of the second flash light emission, third flash light emission is formed mixed
The colour temperature of light combination can be close to the colour temperature of environment light, the even equal to colour temperature of environment light, and the accuracy of white balance calibration is higher.
In one embodiment, the light of the first colour temperature of the first flash light emission can be yellow-green light, and wave-length coverage is
566 nanometers~569 nanometers, the light of the second colour temperature of the second flash light emission can be blue and white light, and colour temperature is 8427K (Kai Er
Text), the light of the third colour temperature of third flash light emission can be orange-red light, and wave-length coverage is 588 nanometers~592 nanometers.Such as
Shown in Fig. 3, white balance is covered using the first colour temperature coordinate A, the second colour temperature coordinate B, third colour temperature coordinate C as the triangle on vertex
The curve 31 of calibration, that is, cover the gray area of white balance calibration.The colour temperature coordinate of the light emitted with above-mentioned three pieces of flash lamps is
The triangle on vertex covers the gray area of white balance calibration just, in this way, can improve white balance with the least flash lamp of number
The accuracy of calibration, and then can control the cost of white balance calibration.Moreover, because the light that above-mentioned three pieces of flash lamps are emitted is simultaneously
Aurora are not belonging to, the difficulty for preparing above-mentioned three pieces of flash lamps is low, it is possible to reduce by three pieces of sudden strains of a muscle used in white balance calibration device
The production cost of light lamp thereby reduces the cost of white balance calibration device.
It should be noted that 3 or more flash lamps can also be used in actual implementation.Wherein, with all flash lamps
The colour temperature coordinate of the light emitted is that the polygon on vertex covers the gray area of white balance calibration, or is emitted with all flash lamps
Light colour temperature coordinate in be located at periphery coordinate be vertex polygon cover white balance calibration gray area.Meanwhile Suo Youshan
Colour temperature of the colour temperature of the mixed light of the formation for the light that light lamp is emitted close to environment light.
In the present embodiment, the accuracy of white balance calibration not only can be improved, moreover, because the wavelength of the light of the first colour temperature
Range is 566 nanometers~569 nanometers, and the colour temperature of the light of the second colour temperature is 8427K, and the wave-length coverage of the light of third colour temperature is 588
Nanometer~592 nanometers, the colour temperature coordinate for the light that three pieces of flash lamps are emitted are that the triangle on vertex covers white balance school just
Quasi- gray area can improve the accuracy of white balance calibration with the least flash lamp of number, and then can control white balance calibration
Cost, and the light that is emitted by above-mentioned three pieces of flash lamps and be not belonging to aurora, the difficulty for preparing above-mentioned three pieces of flash lamps is low,
So the production cost of three pieces of flash lamps used in white balance calibration device can be reduced, and then it further reduced white balance school
The cost of standard apparatus.
Fig. 4 is a kind of flow chart of white balance calibration method shown according to an exemplary embodiment, the white balance calibration
Method is applied on white balance calibration device, and white balance calibration device includes the first flash lamp, the second flash lamp, third flash of light
Lamp, sensor and control module；Wherein, the first flash lamp is used to emit the light of the first colour temperature；The light of first colour temperature is in color
Corresponding first colour temperature coordinate in space；Second flash lamp is used to emit the light of the second colour temperature；The light of second colour temperature is in color space
Middle the second colour temperature of correspondence coordinate；Third flash lamp is used to emit the light of third colour temperature；The light of third colour temperature is right in color space
Third colour temperature coordinate is answered, and white as the covering of the triangle on vertex using the first colour temperature coordinate, the second colour temperature coordinate, third colour temperature coordinate
The gray area of balance calibration.As shown in figure 4, white balance calibration method, includes the following steps:
In step S401, sensors sense environmental light；Environment light corresponding 4th colour temperature coordinate in color space；4th
Colour temperature coordinate is located at gray area.
In step S402, control module is according to the first colour temperature coordinate, the second colour temperature coordinate, third colour temperature coordinate and
Positional relationship between four colour temperature coordinates, determine the light of the first colour temperature, the light of the second colour temperature, third colour temperature light respectively to environment
The weighing factor of light.
In step S403, control module according to above-mentioned respective weighing factor determine the first flash lamp, the second flash lamp,
The corresponding driving current of third flash lamp.
In step s 404, control module adjusts the light of the first colour temperature, second by above-mentioned corresponding driving current
The colour temperature for the mixed light that the light of colour temperature and the light of third colour temperature are formed, makes the colour temperature of mixed light close to the colour temperature of environment light.
In one embodiment, the driving current of the first flash lamp by the first colour temperature light to the weighing factor of environment light with
The maximum current value of first flash lamp determines；Influence power of the driving current of second flash lamp by the light of the second colour temperature to environment light
Weight is determined with maximum current value；The driving current of third flash lamp is by the light of third colour temperature to the weighing factor of environment light and maximum
Current value determines.
In one embodiment, the light of the first colour temperature is true by the first ratio and the second ratio to the weighing factor of environment light
It is fixed, wherein the first ratio is equal to the distance between the second colour temperature coordinate and the 5th colour temperature coordinate and the first colour temperature coordinate and second
The ratio between the distance between colour temperature coordinate；5th colour temperature coordinate is the extended line of the line of third colour temperature coordinate and the 4th colour temperature coordinate
With the coordinate of the first colour temperature coordinate and the intersection point of the second colour temperature coordinate line；The light of second colour temperature to the weighing factor of environment light by
Third ratio and the second ratio determine, wherein third ratio is equal to the distance between the first colour temperature coordinate and the 5th colour temperature coordinate
The ratio between with the distance between the first colour temperature coordinate and the second colour temperature coordinate；The light of third colour temperature is to the weighing factor of environment light by
The distance between five colour temperature coordinates and the 4th colour temperature coordinate are determined with the distance between third colour temperature coordinate and the 5th colour temperature coordinate.
In one embodiment, the wave-length coverage of the light of the first colour temperature is 566 nanometers~569 nanometers, the light of the second colour temperature
Colour temperature be 8427K, the wave-length coverage of the light of third colour temperature is 588 nanometers~592 nanometers.
About the method in above-described embodiment, wherein the concrete mode that each step executes is in the reality in relation to the device
It applies in example and is described in detail, no detailed explanation will be given here.
Fig. 5 is a kind of block diagram of white balance calibration device shown according to an exemplary embodiment.For example, device 1000 can
To be mobile phone, computer, digital broadcasting terminal, messaging device, game console, tablet device, Medical Devices are good for
Body equipment, personal digital assistant etc..
Referring to Fig. 5, device 1000 may include following one or more components: processing component 1002, memory 1004, electricity
Source component 1006, multimedia component 1008, audio component 1010, the interface 1012 of input/output (I/O), sensor module
1014 and communication component 1016.
The integrated operation of the usual control device 1000 of processing component 1002, such as with display, telephone call, data communication,
Camera operation and record operate associated operation.Processing element 1002 may include one or more processors 1020 to execute
Instruction, to perform all or part of the steps of the methods described above.In addition, processing component 1002 may include one or more moulds
Block, convenient for the interaction between processing component 1002 and other assemblies.For example, processing component 1002 may include multi-media module,
To facilitate the interaction between multimedia component 1008 and processing component 1002.
Memory 1004 is configured as storing various types of data to support the operation in equipment 1000.These data
Example includes the instruction of any application or method for operating on device 1000, contact data, telephone book data,
Message, picture, video etc..Memory 1004 can by any kind of volatibility or non-volatile memory device or they
Combination is realized, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), it is erasable can
Program read-only memory (EPROM), programmable read only memory (PROM), read-only memory (ROM), magnetic memory, flash memory
Reservoir, disk or CD.
Electric power assembly 1006 provides electric power for the various assemblies of device 1000.Electric power assembly 1006 may include power management
System, one or more power supplys and other with for device 1000 generate, manage, and distribute the associated component of electric power.
Multimedia component 1008 includes the screen of one output interface of offer between described device 1000 and user.?
In some embodiments, screen may include liquid crystal display (LCD) and touch panel (TP).If screen includes touch panel,
Screen may be implemented as touch screen, to receive input signal from the user.Touch panel includes that one or more touch passes
Sensor is to sense the gesture on touch, slide, and touch panel.The touch sensor can not only sense touch or sliding is dynamic
The boundary of work, but also detect duration and pressure associated with the touch or slide operation.In some embodiments, more
Media component 1008 includes a front camera and/or rear camera.When equipment 1000 is in operation mode, as shot mould
When formula or video mode, front camera and/or rear camera can receive external multi-medium data.Each preposition camera shooting
Head and rear camera can be a fixed optical lens system or have focusing and optical zoom capabilities.
Audio component 1010 is configured as output and/or input audio signal.For example, audio component 1010 includes a wheat
Gram wind (MIC), when device 1000 is in operation mode, when such as call mode, recording mode, and voice recognition mode, microphone quilt
It is configured to receive external audio signal.The received audio signal can be further stored in memory 1004 or via communication
Component 1016 is sent.In some embodiments, audio component 1010 further includes a loudspeaker, is used for output audio signal.
I/O interface 1012 provides interface, above-mentioned peripheral interface module between processing component 1002 and peripheral interface module
It can be keyboard, click wheel, button etc..These buttons may include, but are not limited to: home button, volume button, start button and
Locking press button.
Sensor module 1014 includes one or more sensors, and the state for providing various aspects for device 1000 is commented
Estimate.For example, sensor module 1014 can detecte the state that opens/closes of equipment 1000, the relative positioning of component, such as institute
The display and keypad that component is device 1000 are stated, sensor module 1014 can be with detection device 1000 or device 1,000 1
The position change of a component, the existence or non-existence that user contacts with device 1000,1000 orientation of device or acceleration/deceleration and dress
Set 1000 temperature change.Sensor module 1014 may include proximity sensor, be configured in not any physics
It is detected the presence of nearby objects when contact.Sensor module 1014 can also include optical sensor, as CMOS or ccd image are sensed
Device, for being used in imaging applications.In some embodiments, which can also include acceleration sensing
Device, gyro sensor, Magnetic Sensor, pressure sensor or temperature sensor.
Communication component 1016 is configured to facilitate the communication of wired or wireless way between device 1000 and other equipment.Dress
The wireless network based on communication standard, such as WiFi can be accessed by setting 1000,2G or 3G or their combination.It is exemplary at one
In embodiment, communication component 1016 receives broadcast singal or broadcast correlation from external broadcasting management system via broadcast channel
Information.In one exemplary embodiment, the communication component 1016 further includes near-field communication (NFC) module, to promote short distance
Communication.For example, radio frequency identification (RFID) technology, Infrared Data Association (IrDA) technology, ultra wide band can be based in NFC module
(UWB) technology, bluetooth (BT) technology and other technologies are realized.
In the exemplary embodiment, device 1000 can be by one or more application specific integrated circuit (ASIC), number
Signal processor (DSP), digital signal processing appts (DSPD), programmable logic device (PLD), field programmable gate array
(FPGA), controller, microcontroller, microprocessor or other electronic components are realized, for executing the above method.
In the exemplary embodiment, a kind of non-transitorycomputer readable storage medium including instruction, example are additionally provided
It such as include the memory 1004 of instruction, above-metioned instruction can be executed by the processor 1020 of device 1000 to complete the above method.Example
Such as, the non-transitorycomputer readable storage medium can be ROM, random access memory (RAM), CD-ROM, tape, soft
Disk and optical data storage devices etc..
Those skilled in the art will readily occur to its of the disclosure after considering specification and practicing disclosure disclosed herein
Its embodiment.This application is intended to cover any variations, uses, or adaptations of the disclosure, these modifications, purposes or
Person's adaptive change follows the general principles of this disclosure and including the undocumented common knowledge in the art of the disclosure
Or conventional techniques.The description and examples are only to be considered as illustrative, and the true scope and spirit of the disclosure are by following
Claim is pointed out.
It should be understood that the present disclosure is not limited to the precise structures that have been described above and shown in the drawings, and
And various modifications and changes may be made without departing from the scope thereof.The scope of the present disclosure is only limited by the accompanying claims.
Claims (9)
1. a kind of white balance calibration device, which is characterized in that described device includes: the first flash lamp, the second flash lamp, third sudden strain of a muscle
Light lamp, sensor and control module；
First flash lamp, for emitting the light of the first colour temperature；The light of first colour temperature is corresponding first in color space
Colour temperature coordinate；
Second flash lamp, for emitting the light of the second colour temperature；The light of second colour temperature is corresponding in the color space
Second colour temperature coordinate；
The third flash lamp, for emitting the light of third colour temperature；The light of the third colour temperature is corresponding in the color space
Third colour temperature coordinate, and using the first colour temperature coordinate, the second colour temperature coordinate, the third colour temperature coordinate as the three of vertex
The gray area of angular covering white balance calibration；
The sensor, for detecting environment light；The environment light corresponding 4th colour temperature coordinate in the color space；It is described
4th colour temperature coordinate is located at the gray area；
The control module, for according to the first colour temperature coordinate, the second colour temperature coordinate, the third colour temperature coordinate with
And the positional relationship between the 4th colour temperature coordinate, determine the light of first colour temperature, the light of second colour temperature, described
The light of three colour temperatures respectively to the weighing factor of the environment light, and according to respective weighing factor determine first flash lamp,
Second flash lamp, the corresponding driving current of third flash lamp adjust institute by corresponding driving current
The colour temperature for stating the mixed light of the light formation of the light of the first colour temperature, the light of second colour temperature and the third colour temperature, makes described
Colour temperature of the colour temperature of mixed light close to the environment light.
2. the apparatus according to claim 1, which is characterized in that
The driving current of first flash lamp is by the light of first colour temperature to the weighing factor of the environment light and described the
The maximum current value of one flash lamp determines；
The driving current of second flash lamp by second colour temperature light to the weighing factor of the environment light and it is described most
High current value determines；
The driving current of the third flash lamp by the third colour temperature light to the weighing factor of the environment light and it is described most
High current value determines.
3. the apparatus of claim 2, which is characterized in that influence power of the light of first colour temperature to the environment light
Weight is determined by the first ratio and the second ratio, wherein first ratio is equal to the second colour temperature coordinate and the five colors
The ratio between the distance between warm coordinate and the distance between the first colour temperature coordinate and the second colour temperature coordinate；The five colors
Warm coordinate be the line of the third colour temperature coordinate and the 4th colour temperature coordinate extended line and the first colour temperature coordinate with
The coordinate of the intersection point of the second colour temperature coordinate line；
The light of second colour temperature is determined the weighing factor of the environment light by third ratio and the second ratio, wherein described
Third ratio be equal to the distance between the first colour temperature coordinate and the 5th colour temperature coordinate and the first colour temperature coordinate and
The ratio between the distance between described second colour temperature coordinate；
The light of the third colour temperature is sat the weighing factor of the environment light by the 5th colour temperature coordinate and the 4th colour temperature
The distance between mark is determined with the distance between the third colour temperature coordinate and the 5th colour temperature coordinate.
4. device according to claim 3, which is characterized in that the wave-length coverage of the light of first colour temperature is 566 nanometers
~569 nanometers, the colour temperature of the light of second colour temperature is 8427K, the wave-length coverage of the light of the third colour temperature is 588 nanometers~
592 nanometers.
5. a kind of white balance calibration method, which is characterized in that be applied on white balance calibration device, the white balance calibration device
Including the first flash lamp, the second flash lamp, third flash lamp, sensor and control module；Wherein, first flash lamp is used
In the light for emitting the first colour temperature；The light of first colour temperature corresponds to the first colour temperature coordinate in color space；Described second
Flash lamp is used to emit the light of the second colour temperature；The light of second colour temperature corresponds to second colour temperature in the color space and sits
Mark；The third flash lamp is used to emit the light of third colour temperature；The light of the third colour temperature corresponds to institute in the color space
Third colour temperature coordinate is stated, and using the first colour temperature coordinate, the second colour temperature coordinate, the third colour temperature coordinate as vertex
The gray area of triangle covering white balance calibration；
The white balance calibration method, comprising:
The sensors sense environmental light；The environment light corresponding 4th colour temperature coordinate in the color space；Described 4th
Colour temperature coordinate is located at the gray area；
The control module is according to the first colour temperature coordinate, the second colour temperature coordinate, the third colour temperature coordinate and institute
The positional relationship between the 4th colour temperature coordinate is stated, determines the light of first colour temperature, the light of second colour temperature, the third color
The light of temperature determines first flash lamp, described according to respective weighing factor respectively to the weighing factor of the environment light
Second flash lamp, the corresponding driving current of third flash lamp adjust described the by corresponding driving current
The colour temperature for the mixed light that the light of the light of color temperature, the light of second colour temperature and the third colour temperature is formed, makes the mixing
Colour temperature of the colour temperature of light close to the environment light.
6. according to the method described in claim 5, it is characterized in that, the driving current of first flash lamp is by first color
The light of temperature determines the weighing factor of the environment light and the maximum current value of first flash lamp；
The driving current of second flash lamp by second colour temperature light to the weighing factor of the environment light and it is described most
High current value determines；
The driving current of the third flash lamp by the third colour temperature light to the weighing factor of the environment light and it is described most
High current value determines.
7. according to the method described in claim 6, it is characterized in that, influence power of the light of first colour temperature to the environment light
Weight is determined by the first ratio and the second ratio, wherein first ratio is equal to the second colour temperature coordinate and the five colors
The ratio between the distance between warm coordinate and the distance between the first colour temperature coordinate and the second colour temperature coordinate；The five colors
Warm coordinate be the line of the third colour temperature coordinate and the 4th colour temperature coordinate extended line and the first colour temperature coordinate with
The coordinate of the intersection point of the second colour temperature coordinate line；
The light of second colour temperature is determined the weighing factor of the environment light by third ratio and the second ratio, wherein described
Third ratio be equal to the distance between the first colour temperature coordinate and the 5th colour temperature coordinate and the first colour temperature coordinate and
The ratio between the distance between described second colour temperature coordinate；
The light of the third colour temperature is sat the weighing factor of the environment light by the 5th colour temperature coordinate and the 4th colour temperature
The distance between mark is determined with the distance between the third colour temperature coordinate and the 5th colour temperature coordinate.
8. the method according to the description of claim 7 is characterized in that the wave-length coverage of the light of first colour temperature is 566 nanometers
~569 nanometers, the colour temperature of the light of second colour temperature is 8427K, the wave-length coverage of the light of the third colour temperature is 588 nanometers~
592 nanometers.
9. a kind of white balance calibration device, which is characterized in that the white balance calibration device includes the first flash lamp, the second flash of light
Lamp, third flash lamp and sensor；Wherein, first flash lamp is used to emit the light of the first colour temperature；First colour temperature
Light the first colour temperature coordinate is corresponded in color space；Second flash lamp is used to emit the light of the second colour temperature；It is described
The light of second colour temperature corresponds to the second colour temperature coordinate in the color space；The third flash lamp is for emitting third color
The light of temperature；The light of the third colour temperature corresponds to the third colour temperature coordinate in the color space, and with first colour temperature
Coordinate, the second colour temperature coordinate, the triangle that the third colour temperature coordinate is vertex cover the gray area of white balance calibration；It is described
Sensor is for detecting environment light；The environment light corresponding 4th colour temperature coordinate in the color space；4th colour temperature
Coordinate is located at the gray area；
Described device further include:
Processor；
Memory for storage processor executable instruction；
Wherein, the processor is configured to:
It is sat according to the first colour temperature coordinate, the second colour temperature coordinate, the third colour temperature coordinate and the 4th colour temperature
Positional relationship between mark determines that the light of first colour temperature, the light of second colour temperature, the light of the third colour temperature are respectively right
The weighing factor of the environment light, and first flash lamp, second flash lamp, institute are determined according to respective weighing factor
The corresponding driving current of third flash lamp is stated, light, the institute of first colour temperature are adjusted by corresponding driving current
The colour temperature for the mixed light that the light of the light and the third colour temperature of stating the second colour temperature is formed, makes the colour temperature of the mixed light close to institute
State the colour temperature of environment light.
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| CN201710601900.5A CN109286808A (en) | 2017-07-21 | 2017-07-21 | White balance calibration method and device |
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