CN105872510B - A kind of image white balancing treatment method and device - Google Patents
A kind of image white balancing treatment method and device Download PDFInfo
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- CN105872510B CN105872510B CN201610261027.5A CN201610261027A CN105872510B CN 105872510 B CN105872510 B CN 105872510B CN 201610261027 A CN201610261027 A CN 201610261027A CN 105872510 B CN105872510 B CN 105872510B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04N9/00—Details of colour television systems
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Abstract
The present invention, which provides a kind of image white balancing treatment method and device, this method, to be included：Determine near-infrared intensity corresponding to pending image；The pending image is divided into multiple sub-blocks, and determines each position of the sub-block in preset color temperature coordinate system；According to the position of the near-infrared intensity and each sub-block in the preset color temperature coordinate system, it is determined that the weights of corresponding sub-block；The r channel gains and b channel gains of pending image according to the weight computing of each sub-block, and g channel gains are arranged to 1；White balance processing is carried out to the pending image according to the r channel gains, g channel gains and b channel gains of the pending image.The both compatible scene including fluorescent light source of the present invention, moreover it is possible to improve the accuracy of image white balance to a certain extent.
Description
Technical field
The present invention relates to technical field of image processing, more particularly to a kind of image white balancing treatment method and device.
Background technology
When we with the naked eye watch object under different light, the sensation to different colours is substantially identical, than
Such as：In the morning during rising sun initial rise, the object visually seen is white；Under night dim light, the object is visually seen,
Still it can feel that it is white.Because the mankind, in developmental process, brain is to the colour of object under different light
Also original adaptability.But camera apparatus (such as video camera) is but without the adaptability of human eye, due to CCD (Charge-
Coupled Device, charge coupled cell) output disequilibrium, camera apparatus can under different light to same color produce
Raw colour cast phenomenon, causes camera apparatus colour reproduction distortion, i.e.,：Colour temperature is higher, and blue composition is more, and image will be partially blue；
Colour temperature is lower, and red composition is more, and image will be partially red.At this time, it may be necessary to the image collected to camera apparatus is carried out in vain
Balance Treatment, to solve the problems, such as camera apparatus caused image color reduction distortion when going back the color of original image.
At present, conventional image white balancing treatment method is：
Gathered in colour temperature lamp box r (red), the g (green) of each pixel in the grey block of colour atla and white block under different-colour with
And b (indigo plant) value, and calculate the first ratio r of three primary colors (i.e. r, the g, b) component/g and ternary colouring component second of each pixel
Ratio b/g；It is ordinate by abscissa, b/g of r/g, establishes colour temperature coordinate system；To each pixel r/g and b/g, carry out more
Item formula fitting, obtains a colour temperature curve；Two are established in the both sides of colour temperature curve according to the first distance and second distance respectively
First distance Curve and two second distance curves, the first distance are less than second distance；Pending image is gathered, is determined pending
The r/g and b/g of each pixel in image, that is, determine each coordinate points (r/g, b/ corresponding to pixel in pending image
G), then position of the coordinate points in above-mentioned coordinate system corresponding to the pixel is determined for each pixel in pending image
Put, if coordinate points are between the first distance Curve and colour temperature curve corresponding to the pixel, it is determined that corresponding to the pixel
Weights are a, if coordinate points corresponding to the pixel are in first distance Curve and second distance curve of colour temperature curve the same side
Between, it is determined that weights corresponding to the pixel are b, if outside second distance curve, by power corresponding to the pixel
Value is arranged to 0, wherein, a is more than b and a and b are all higher than 0；Determine in pending image after each weights corresponding to pixel, root
According to r, g and b channel gain of the weight computing pending image, and then according to r, g and b passage of the pending image
Gain carries out blank level adjustment to pending image.
However, for fluorescent light source, the spectrum of the light source has uneven slip, the spectrum of the light source (natural light) of standard
With flatness, if fluorescent light source is considered in colour temperature coordinate system, colour temperature corresponding to fluorescent light source is bent apart from colour temperature
Line it is distant, if wanting scene of the compliant packet containing fluorescent light source, second distance threshold value can only be increased, so as to by daylight
Lamp source is covered within distance Curve, but after second distance increase, in the way of the processing of existing image white balance, can be led
The problem of causing the image white balance effect inaccuracy of fluorescent lamp scene and natural light scene, i.e. existing image white balance processing
Method is not suitable for including the scene of fluorescent light source, therefore, need badly at present it is a kind of can be in the scene including fluorescent light source
The lower accurate method for carrying out image white balance processing.
The content of the invention
The present invention provides a kind of image white balancing treatment method and device, to solve existing image white balance processing side
Method is not suitable for the problem of scene comprising fluorescent light source.
A kind of image white balancing treatment method, including：
Determine near-infrared intensity corresponding to pending image；
The pending image is divided into multiple sub-blocks, and determines each sub-block in preset color temperature coordinate system
Position, the preset color temperature coordinate system include colour temperature curve, and in every side of the colour temperature curve both sides according to
Two the first distance Curves and second distance curve that one distance and second distance are established, first distance be less than second away from
From the colour temperature of fluorescent light source is between first distance Curve of described colour temperature curve the same side and second distance curve；
According to the position of the near-infrared intensity and each sub-block in the preset color temperature coordinate system, it is determined that corresponding son
The weights of block；
The r channel gains and b channel gains of pending image according to the weight computing of each sub-block, and by g passages
Gain is arranged to 1；
According to the r channel gains, g channel gains and b channel gains of the pending image to the pending image
Carry out white balance processing.
In methods described, near-infrared intensity corresponding to pending image is determined, is specifically included：
Aperture time, described image collecting device when the pending image is gathered according to image capture device gather institute
Light-sensitive device when multiplication factor and described image collecting device when stating pending image gather the pending image
Voltage, determine near-infrared intensity corresponding to pending image, the voltage of the light-sensitive device by light-sensitive device by near-infrared into
Intermuscular needling is converted to after swashing.
Pending image is calculated according to the voltage of aperture time, multiplication factor and light-sensitive device in the embodiment of the present invention
Near-infrared intensity.
Methods described, near-infrared intensity corresponding to pending image is determined using equation below：
AvgNIR=rawNIR × shut × gain
Wherein, avgNIR represents near-infrared intensity corresponding to pending image, and rawNIR represents described image collecting device
The voltage of light-sensitive device during the pending image is gathered, shut represents that the collection of described image collecting device is described pending
Aperture time during image, gain represent multiplication factor when described image collecting device gathers the pending image.
In methods described, the preset color temperature coordinate system is established in the following way：
Respectively using the first ratio r of three primary color components/g and three primary color components the second ratio b/g as abscissa and ordinate, build
Vertical preset color temperature coordinate system；
Then, it is determined that each position of the sub-block in preset color temperature coordinate system, is specifically included：
For each sub-block, calculate all pixels point in the sub-block r components sum, g components sum and b components it
With；
According to the number of pixel in the sub-block, r components average value, g components average value and the b of the sub-block are calculated respectively
Component average value；
, will using the r components average value ratio of three primary color components first corresponding as the sub-block with the ratio of g component average values
The ratio of b components average value and g component average values is as the corresponding ratio of three primary color components second of the sub-block；
According to the ratio of three primary color components second corresponding to the ratio of three primary color components first corresponding to the sub-block and the sub-block,
Determine position of the sub-block in preset color temperature coordinate system.
The embodiment of the present invention calculates the average value of the three primary color components of each pixel in each sub-block first, and then according to
Three primary color components average value determines position of the sub-block in preset color temperature coordinate, can so improve true to a certain extent
Accuracy of the sub-block made in the position of colour temperature coordinate.
In methods described, according to the position of the near-infrared intensity and each sub-block in the preset color temperature coordinate system
Put, it is determined that the weights of corresponding sub-block, are specifically included：
For each sub-block, judge whether position of the sub-block in the preset color temperature coordinate system be bent positioned at the colour temperature
Between first distance Curve and second distance curve of line the same side；
If it is, the ratio H of the near-infrared intensity and the default three primary color components of the sub-block is determined, and according to H and in advance
If the comparative result of threshold value, the weights of the sub-block are determined, the default three primary color components are the r components average value of the sub-block or are somebody's turn to do
The g components average value of sub-block or the b component average values of the sub-block；
If not, determine position of the sub-block in the preset color temperature coordinate system between two the first distance Curves
When, the weights for determining the sub-block are 1；Determine position of the sub-block in the preset color temperature coordinate system and the colour temperature curve
When distance is more than second distance, the weights for determining the sub-block are 0.
In methods described, according to H and the comparative result of predetermined threshold value, the weights of the sub-block are determined, are specifically included：
When determining that H is more than or equal to predetermined threshold value, the weights for determining the sub-block are 0；
When determining that H is less than predetermined threshold value, the weights for determining the sub-block are 1.
The present invention also provides a kind of image white balance processing equipment, including：
Strength determining unit, for determining near-infrared intensity corresponding to pending image；
Position determination unit, for the pending image to be divided into multiple sub-blocks, and determine that each sub-block exists
Position in preset color temperature coordinate system, the preset color temperature coordinate system include colour temperature curve, and in the colour temperature curve two
Two the first distance Curves and second distance curve that every side of side is established according to the first distance and second distance, described the
One distance is less than second distance, the colour temperature of fluorescent light source described colour temperature curve the same side the first distance Curve and second away from
From between curve；
Weights determining unit, for according to the near-infrared intensity and each sub-block in the preset color temperature coordinate system
Position, it is determined that the weights of corresponding sub-block；
Weight calculation unit, r channel gains and b for pending image described in the weight computing according to each sub-block lead to
Road gain, and g channel gains are arranged to 1；
Processing unit, for the r channel gains according to the pending image, g channel gains and b channel gains to institute
State pending image and carry out white balance processing.
In described device, the strength determining unit is specifically used for：
Aperture time, described image collecting device when the pending image is gathered according to image capture device gather institute
Light-sensitive device when multiplication factor and described image collecting device when stating pending image gather the pending image
Voltage, determine near-infrared intensity corresponding to pending image, the voltage of the light-sensitive device by light-sensitive device by near-infrared into
Intermuscular needling is converted to after swashing.
In described device, the strength determining unit determines that near-infrared corresponding to pending image is strong using equation below
Degree：
AvgNIR=rawNIR × shut × gain
Wherein, avgNIR represents near-infrared intensity corresponding to pending image, and rawNIR represents described image collecting device
The voltage of light-sensitive device during the pending image is gathered, shut represents that the collection of described image collecting device is described pending
Aperture time during image, gain represent multiplication factor when described image collecting device gathers the pending image.
In described device, the position determination unit is additionally operable to：
The preset color temperature coordinate system is established in the following way：
Respectively using the first ratio r of three primary color components/g and three primary color components the second ratio b/g as abscissa and ordinate, build
Vertical preset color temperature coordinate system；
Then, the position determination unit is it is determined that during position of each sub-block in preset color temperature coordinate system, specifically
For：
For each sub-block, calculate all pixels point in the sub-block r components sum, g components sum and b components it
With；
According to the number of pixel in the sub-block, r components average value, g components average value and the b of the sub-block are calculated respectively
Component average value；
, will using the r components average value ratio of three primary color components first corresponding as the sub-block with the ratio of g component average values
The ratio of b components average value and g component average values is as the corresponding ratio of three primary color components second of the sub-block；
According to the ratio of three primary color components second corresponding to the ratio of three primary color components first corresponding to the sub-block and the sub-block,
Determine position of the sub-block in preset color temperature coordinate system.
In described device, the weights determining unit is specifically used for：
For each sub-block, judge whether position of the sub-block in the preset color temperature coordinate system be bent positioned at the colour temperature
Between first distance Curve and second distance curve of line the same side；
If it is, the ratio H of the near-infrared intensity and the default three primary color components of the sub-block is determined, and according to H and in advance
If the comparative result of threshold value, the weights of the sub-block are determined, the default three primary color components are the r components average value of the sub-block or are somebody's turn to do
The g components average value of sub-block or the b component average values of the sub-block；
If not, determine position of the sub-block in the preset color temperature coordinate system between two the first distance Curves
When, the weights for determining the sub-block are 1；Determine position of the sub-block in the preset color temperature coordinate system and the colour temperature curve
When distance is more than second distance, the weights for determining the sub-block are 0.
In described device, the weights determining unit determines the power of the sub-block in the comparative result according to H and predetermined threshold value
During value, it is specifically used for：
When determining that H is more than or equal to predetermined threshold value, the weights for determining the sub-block are 0；
When determining that H is less than predetermined threshold value, the weights for determining the sub-block are 1.
The method and device handled using image white balance provided in an embodiment of the present invention, is had the advantages that：
When the first distance Curve and second distance curve are established in preset color temperature coordinate system, the colour temperature of fluorescent light source is included in colour temperature
Between first distance Curve and second distance curve of curve the same side, also, according to each color lump in pending image pre-
If the near-infrared intensity of the position and pending image in colour temperature coordinate system, determining the weights of each sub-block, so as to treat place
Manage image and carry out white balance processing, so when carrying out the processing of image white balance, pass through the position for considering sub-block and pending figure
The near-infrared intensity of picture, the scene comprising fluorescent light source is taken into account, automatically image can be carried out according to current scene
White balance processing, so as to the compatible scene of fluorescent light source, the accuracy of image white balance is improved to a certain extent.
Brief description of the drawings
Fig. 1 is image white balancing treatment method flow chart provided in an embodiment of the present invention；
Fig. 2 is image capture device schematic diagram provided in an embodiment of the present invention；
Fig. 3 is the distance Curve of foundation provided in an embodiment of the present invention and the schematic diagram of colour temperature curve；
Fig. 4 is the spectrum of fluorescent light source provided in an embodiment of the present invention；
Fig. 5 is the spectrum of each natural radiant provided in an embodiment of the present invention；
Fig. 6 is the method flow of position of each sub-block of determination provided in an embodiment of the present invention in preset color temperature coordinate system
Figure；
Fig. 7 is the method flow diagram of weights corresponding to determination sub-block provided in an embodiment of the present invention；
Fig. 8 is provided in an embodiment of the present invention according to H and the comparative result of predetermined threshold value, the method for determining the weights of sub-block
Flow chart；
Fig. 9 is white balancing apparatus schematic diagram provided in an embodiment of the present invention.
Embodiment
Image white balancing treatment method provided by the invention and device are carried out with reference to the accompanying drawings and examples more detailed
Ground explanation.
The embodiment of the present invention provides a kind of image white balancing treatment method, as shown in figure 1, including：
Step 101, near-infrared intensity corresponding to pending image is determined.
Specifically, in order that image capture device can obtain near-infrared composition (near infrared light), the embodiment of the present invention
Image capture device carries light hole, saturating infrared fileter and light-sensitive device, as shown in Fig. 2 infrared fileter is positioned at logical thoroughly
Between unthreaded hole and light-sensitive device, light hole is located near the camera of image capture device, can so ensure to reach camera
It is identical with the light of light hole collection, it is preferable that light hole is located at the underface of the camera of image capture device, apart from camera
Certain distance, this is apart from the smaller the better.Saturating infrared fileter is used to filter out visible ray, so as to prevent visible ray from reaching photosensor
Part, saturating infrared fileter only allow default near-infrared shortwave by and reach light-sensitive device.Preferably, default near-infrared is short
The wave-length coverage of ripple is 700nm~900nm, or other wave-length coverages, is not limited here.Light-sensitive device receives closely
The stimulation of infrared short wavelength components, it is analog voltage by the near-infrared intensity-conversion of near-infrared shortwave, then analog voltage is converted to
After data signal, the CPU (central processing unit) for being sent to image capture device is handled.
Step 102, the pending image is divided into multiple sub-blocks, and determines that each sub-block is sat in preset color temperature
Position in mark system, the preset color temperature coordinate system include colour temperature curve, and in every side of the colour temperature curve both sides
Two the first distance Curves and second distance curve, first distance established according to the first distance and second distance are less than
Second distance, the colour temperature of fluorescent light source described colour temperature curve the same side the first distance Curve and second distance curve it
Between.
Specifically, pending image is divided into multiple sub-blocks, image can be drawn according to the size of pending image
Point, the number for the pixel that each sub-block is included does not limit, it is preferable that each sub-block includes a pixel.And determine
Position of the colour temperature in preset color temperature curve corresponding to each sub-block.The colour temperature of fluorescent light source may be in any of colour temperature curve
The colour temperature of side, i.e. fluorescent light source may the colour temperature curve either side the first distance Curve and second distance curve it
Between, it is also possible to while in the both sides of colour temperature curve, it is possible to while the first distance in every side of the colour temperature curve is bent
Between line and second distance curve.
Wherein, colour temperature curve establishes mode and can use prior art, is not detailed here, the first distance Curve and second
Distance Curve is respectively that the colour temperature curve translates the first distance and second distance obtains respectively to the both sides of the colour temperature curve, is such as schemed
Shown in 3,1 is colour temperature curve, and 21 and 22 be respectively the first distance Curves, and 31 and 32 be second distance curve, DISD1 for first away from
From DIS2 is second distance.The embodiment of the present invention predefines colour temperature corresponding to fluorescent light source in preset color temperature coordinate system
Position, position of the colour temperature in preset color temperature coordinate system according to corresponding to fluorescent light source, set the first distance and second away from
From specifically, the first distance is less than colour temperature corresponding to fluorescent light source and the distance of colour temperature curve, second distance is more than fluorescent lamp
The distance of colour temperature corresponding to light source and colour temperature curve, i.e. the colour temperature of fluorescent light source in described colour temperature curve the same side first
Between distance Curve and second distance curve.
Step 103, the position according to the near-infrared intensity and each sub-block in the preset color temperature coordinate system, really
Surely the weights of sub-block are corresponded to.
Specifically, the position by each sub-block in preset color temperature coordinate system, and the near-infrared of pending image are strong
Degree, can determine whether include fluorescent light source in scene during the pending image of collection from side.
Specifically, near-infrared intensity corresponding to pending image can be global near-infrared intensity corresponding to the image, i.e.
The corresponding near-infrared intensity of entire image；Near-infrared intensity corresponding to pending image can be each sub-block pair in the image
The local near-infrared intensity answered, i.e. the corresponding near-infrared intensity of a sub-block in image.For each sub-block, according to this
Near-infrared intensity corresponding to position and pending image of the sub-block in preset color temperature coordinate system, the weights of the sub-block are determined, from
And provide premise to carry out the processing of image white balance.
Step 104, according to the weight computing of each sub-block pending image r channel gains and b channel gains, and
G channel gains are arranged to 1.
Specifically, after determining the weights of each sub-block, the r channel gains and g channel gains of pending image are calculated, and will
The g channel gains of pending image are arranged to 1.The r channel gains of pending image are calculated with specific reference to below equation：
Wherein, Kr represents the r channel gains of pending image, giRepresent the g component average values of i-th of sub-block, weighti
Represent the weights of i-th of sub-block, riRepresent the r component average values of i-th of sub-block.
The b channel gains of pending image are calculated with specific reference to below equation：
Wherein, Kb represents the b channel gains of pending image, giRepresent the g component average values of i-th of sub-block, weighti
Represent the weights of i-th of sub-block, biRepresent the b component average values of i-th of sub-block.
Kg=1, wherein, Kg represents the g channel gains of pending image.
Step 105, treated according to the r channel gains, g channel gains and b channel gains of the pending image to described
Handle image and carry out white balance processing.
Specifically, after determining r, g and b channel gain of pending image, by the r of each pixel in pending image
Component is multiplied by r channel gains, and the b components of each pixel in pending image are multiplied by into b channel gains, realized to pending figure
The image white balance processing of picture, or, each r components average value corresponding to sub-block in pending image is multiplied by r channel gains,
Each b components average value corresponding to sub-block in pending image is multiplied by b channel gains, realized white to the image of pending image
Balance Treatment.
Specifically, being learnt by experiment, the spectrum of fluorescent light source has rough characteristic, and this may result in daylight light
The colour temperature in source apart from colour temperature curve distance (second distance for being likely larger than prior art) farther out, if utilizing prior art
Image white balancing treatment method, it is necessary to second distance is amplified, it is so as to reach that the weights of the colour temperature of fluorescent light source are relative
Stable purpose, but, after second distance amplification, other color lumps can be included, such as the outdoor green that at candlelight divides
The color of block and the color of fluorescent lamp very close to, this may result in image is carried out white balance processing it is ineffective the problem of.
The present inventor learnt by the spectrum of the spectrum and each natural radiant of studying fluorescent light source, day
Luminous intensity (near-infrared intensity) of the light lamp source at near-infrared shortwave is weaker, and each natural radiant is at near-infrared shortwave
Luminous intensity of the luminous intensity (near-infrared intensity) than fluorescent light source at near-infrared shortwave it is many by force, therefore, natural radiant
Have with fluorescent light source at near-infrared shortwave it is larger can identification, as shown in figure 4, being day provided in an embodiment of the present invention
The spectrum of light lamp source, as shown in figure 5, being the spectrum of each natural radiant provided in an embodiment of the present invention, in Fig. 4 and Fig. 5
Abscissa be light wavelength, unit is nanometer (nm), and ordinate is luminous intensity, wherein, set wavelength as the light after 700nm
For near-infrared shortwave, light intensity is substantially than the near-infrared ripple after 700nm in Fig. 5 corresponding to the near-infrared ripple in Fig. 4 after 700nm
Light before it is weak, i.e. natural radiant and fluorescent light source have at near-infrared shortwave it is larger can identification.
The embodiment of the present invention, when the first distance Curve and second distance curve are established in preset color temperature coordinate system, by day
The colour temperature of light lamp source is included between first distance Curve and second distance curve of colour temperature curve the same side, also, according to
The near-infrared intensity of position and pending image of each color lump in preset color temperature coordinate system in pending image, it is determined that respectively
The weights of individual sub-block, so as to carry out white balance processing to pending image, so when carrying out the processing of image white balance, although putting
Big second distance, but by considering the position of sub-block and the near-infrared intensity of pending image, fluorescent light source will be included
Scene take into account, automatically image can be carried out at white balance according to current scene (regardless of whether including daylight source)
Reason, so as to the compatible scene of fluorescent light source, the accuracy of image white balance is improved to a certain extent.
Preferably, near-infrared image corresponding to pending image is near red for the overall situation of pending image in the embodiment of the present invention
Outer image, near-infrared intensity corresponding to pending image can be determined in the following way, is specifically included：
Aperture time, described image collecting device when the pending image is gathered according to image capture device gather institute
Light-sensitive device when multiplication factor and described image collecting device when stating pending image gather the pending image
Voltage, determine near-infrared intensity corresponding to pending image, the voltage of the light-sensitive device by light-sensitive device by near-infrared into
Intermuscular needling is converted to after swashing.
Specifically, after image capture device acquires pending image, determine that near-infrared corresponding to pending image is strong
Degree.Other existing ways can also be used by determining the mode of near-infrared intensity corresponding to pending image, not limited here.
It is further preferred that near-infrared intensity corresponding to pending image is determined using equation below：
AvgNIR=rawNIR × shut × gain
Wherein, avgNIR represents near-infrared intensity corresponding to pending image, and rawNIR represents described image collecting device
The voltage of light-sensitive device during the pending image is gathered, shut represents that the collection of described image collecting device is described pending
Aperture time during image, gain represent multiplication factor when described image collecting device gathers the pending image.
Also the existing formula for calculating near-infrared intensity corresponding to pending image can be used, it is corresponding to calculate pending image
Near-infrared intensity.
Specifically, in the embodiment of the present invention, preset color temperature coordinate system is established in the following way：
Respectively using the first ratio r of three primary color components/g and three primary color components the second ratio b/g as abscissa and ordinate, with
(0,0) be the origin of coordinates, establish preset color temperature coordinate system, the embodiment of the present invention preferably using the first ratio r of three primary color components/g as
Abscissa, using three primary color components the second ratio b/g as ordinate, can also using the first ratio r of three primary color components/g as ordinate,
Using three primary color components the second ratio b/g as abscissa, do not limit here.
Assuming that be abscissa, using three primary color components the second ratio b/g as ordinate using the first ratio r of three primary color components/g,
With (0,0) for the origin of coordinates, preset color temperature coordinate system is established, then, in step 102, it is determined that each sub-block is in preset color temperature
Position in coordinate system, as shown in fig. 6, specifically including：
Step 201, for each sub-block, calculate r components sum, the g components sum of all pixels point in the sub-block with
And b component sums.
Specifically, the r component sums for assuming all pixels point on sub-block i areG component sums areAnd b
Component sumWherein, i represents any sub-block on pending image, and i is the integer more than or equal to 1, and i is less than pending figure
The sum of sub-block as corresponding to.
Step 202, according to the number of pixel in the sub-block, r components average value, the g components for calculating the sub-block respectively are put down
Average and b component average values.
Specifically, the number for assuming pixel in sub-block i is M, sub-block i r component average values areG components are put down
Average isAnd b component average values areThen,
Step 203, using r components average value three primary color components corresponding as the sub-block with the ratio of g component average values
One ratio, using the b components average value ratio of three primary color components second corresponding as the sub-block with the ratio of g component average values.
Specifically, the ratio of three primary color components first is corresponding to sub-block iThree primary colors corresponding to sub-block i point
The ratio of flow control two is
Step 204, the three primary color components corresponding to the ratio of three primary color components first and the sub-block according to corresponding to the sub-block
Second ratio, determine position of the sub-block in preset color temperature coordinate system.
It is specifically, corresponding according to sub-block iWithForm coordinate points
Determine position of the coordinate points in preset color temperature coordinate system.
Positions of the sub-block i in preset color temperature coordinate system is：First distances of the sub-block i in colour temperature curve the same side is bent
Between line and second distance curve, or, sub-block i between two the first distance Curves of colour temperature curve both sides, or, should
Position of the sub-block in preset color temperature coordinate system and the distance of colour temperature curve are more than second distance, i.e. coordinate pointsDistance to colour temperature curve is more than second distance.
The embodiment of the present invention calculates the average value of the three primary color components of each pixel in each sub-block first, and then according to
Three primary color components average value determines position of the sub-block in preset color temperature coordinate, can so improve true to a certain extent
Accuracy of the sub-block made in the position of colour temperature coordinate.The embodiment that Fig. 6 is provided is that one kind is preferably carried out mode, also may be used
The three primary color components of any pixel point determine position of the sub-block in preset color temperature coordinate system in selection sub-block.
Preferably, step 103 according to the near-infrared intensity and each sub-block in the preset color temperature coordinate system
Position, it is determined that the weights of corresponding sub-block, as shown in fig. 7, specifically including：
Step 301, for each sub-block, judge whether position of the sub-block in the preset color temperature coordinate system is located at institute
Between the first distance Curve and the second distance curve of stating colour temperature curve the same side, if it is, performing step 302, otherwise, perform
Step 303.
Step 302, the ratio H of the near-infrared intensity and the default three primary color components of the sub-block is determined, and according to H and in advance
If the comparative result of threshold value, the weights of the sub-block are determined, the default three primary color components are the r components average value of the sub-block or are somebody's turn to do
The g components average value of sub-block or the b component average values of the sub-block.
Specifically, being directed to each sub-block, the pre- of near-infrared intensity avgNIR corresponding to pending image and sub-block i is calculated
If the ratio H of three primary color components, when default three primary color components are sub-block i r component average values,
When default three primary color components are sub-block i g component average values,When default three primary color components are to be somebody's turn to do
During sub-block i b component average values,
Step 303, judge whether position of the sub-block in the preset color temperature coordinate system be bent positioned at two first distances
Between line, if it is, performing step 304, otherwise, step 305 is performed.
Step 304, the weights for determining the sub-block are 1.
Step 305, determine that position of the sub-block in the preset color temperature coordinate system and the distance of the colour temperature curve are big
In second distance, and determine the sub-block weights be 0.
Specifically, the weights of the sub-block in pending image between two the first curves are arranged to 1, will be at two article
The weights of sub-block outside two distance Curves are arranged to 0, for colour temperature curve the same side the first distance Curve and second away from
From the weights of the sub-block between curve, according to the ratio of near-infrared intensity and default three primary color components and predetermined threshold value comparative result
Setting.
Specifically, also can be by the weights of the sub-block in pending image between two the first curves in the embodiment of the present invention
The other values being arranged to outside 1, the weights of the sub-block outside two second distance curves are arranged to the other values outside 0,
The weights of each sub-block be more than or equal to 0, and, less than or equal to 1, the weights of the sub-block in pending image between two the first curves
More than the weights of the sub-block outside two second distance curves.
In step 302, according to H and the comparative result of predetermined threshold value, the weights of the sub-block are determined, as shown in figure 8, specifically wrapping
Include：
Step 401, judge whether H is less than predetermined threshold value, if it is, performing step 402, otherwise, perform step 403.
Step 402, the weights for determining the sub-block are 1.
Step 403, the weights for determining the sub-block are 0.
The embodiment of the present invention, when determining that H is more than or equal to predetermined threshold value, the weights for determining the sub-block are 0；Determine that H is less than
During predetermined threshold value, the weights for determining the sub-block are 1.The near-infrared composition of the bigger expression sub-blocks of H is more, now illustrates the sub-block
It is not the sub-block under fluorescent light source, the weights of the sub-block is arranged to 0, conversely, illustrates that the sub-block is under fluorescent light source
Sub-block, the weights of the sub-block are arranged to 1, so as to when carrying out white balance processing to image, the compatible field of fluorescent light source
Scape.
In the embodiment of the present invention, in the case where H is less than predetermined threshold value, the weights of the sub-block are that may be alternatively provided as other
Value, the specific other values are less than the weights of the sub-block in pending image between two the first curves, and more than at two
The weights of sub-block outside second distance curve.In the case where H is more than or equal to predetermined threshold value, the weights of the sub-block can wait
In the weights of the sub-block outside two second distance curves.
The present invention also provides a kind of image white balance processing equipment, as shown in figure 9, including：
Strength determining unit 901, for determining near-infrared intensity corresponding to pending image；
Position determination unit 902, for the pending image to be divided into multiple sub-blocks, and determine each sub-block
Position in preset color temperature coordinate system, the preset color temperature coordinate system include colour temperature curve, and in the colour temperature curve
Two the first distance Curves and second distance curve that every side of both sides is established according to the first distance and second distance, it is described
First distance is less than second distance, the first distance Curve and second of the colour temperature of fluorescent light source in described colour temperature curve the same side
Between distance Curve；
Weights determining unit 903, for according to the near-infrared intensity and each sub-block in the preset color temperature coordinate
Position in system, it is determined that the weights of corresponding sub-block；
Weight calculation unit 904, for pending image described in the weight computing according to each sub-block r channel gains and
B channel gains, and g channel gains are arranged to 1；
Processing unit 905, for the r channel gains according to the pending image, g channel gains and b channel gains
White balance processing is carried out to the pending image.
Preferably, in described device, the strength determining unit is specifically used for：
Aperture time, described image collecting device when the pending image is gathered according to image capture device gather institute
Light-sensitive device when multiplication factor and described image collecting device when stating pending image gather the pending image
Voltage, determine near-infrared intensity corresponding to pending image, the voltage of the light-sensitive device by light-sensitive device by near-infrared into
Intermuscular needling is converted to after swashing.
Preferably, in described device, the strength determining unit is determined near corresponding to pending image using equation below
Infrared intensity：
AvgNIR=rawNIR × shut × gain
Wherein, avgNIR represents near-infrared intensity corresponding to pending image, and rawNIR represents described image collecting device
The voltage of light-sensitive device during the pending image is gathered, shut represents that the collection of described image collecting device is described pending
Aperture time during image, gain represent multiplication factor when described image collecting device gathers the pending image.
Preferably, in described device, the position determination unit is additionally operable to：
The preset color temperature coordinate system is established in the following way：
Respectively using the first ratio r of three primary color components/g and three primary color components the second ratio b/g as abscissa and ordinate, build
Vertical preset color temperature coordinate system；
Then, the position determination unit is it is determined that during position of each sub-block in preset color temperature coordinate system, specifically
For：
For each sub-block, calculate all pixels point in the sub-block r components sum, g components sum and b components it
With；
According to the number of pixel in the sub-block, r components average value, g components average value and the b of the sub-block are calculated respectively
Component average value；
, will using the r components average value ratio of three primary color components first corresponding as the sub-block with the ratio of g component average values
The ratio of b components average value and g component average values is as the corresponding ratio of three primary color components second of the sub-block；
According to the ratio of three primary color components second corresponding to the ratio of three primary color components first corresponding to the sub-block and the sub-block,
Determine position of the sub-block in preset color temperature coordinate system.
Preferably, in described device, the weights determining unit is specifically used for：
For each sub-block, judge whether position of the sub-block in the preset color temperature coordinate system be bent positioned at the colour temperature
Between first distance Curve and second distance curve of line the same side；
If it is, the ratio H of the near-infrared intensity and the default three primary color components of the sub-block is determined, and according to H and in advance
If the comparative result of threshold value, the weights of the sub-block are determined, the default three primary color components are the r components average value of the sub-block or are somebody's turn to do
The g components average value of sub-block or the b component average values of the sub-block；
If not, determine position of the sub-block in the preset color temperature coordinate system between two the first distance Curves
When, the weights for determining the sub-block are 1；Determine position of the sub-block in the preset color temperature coordinate system and the colour temperature curve
When distance is more than second distance, the weights for determining the sub-block are 0.
Preferably, in described device, the weights determining unit is in the comparative result according to H and predetermined threshold value, it is determined that should
During the weights of sub-block, it is specifically used for：
When determining that H is more than or equal to predetermined threshold value, the weights for determining the sub-block are 0；
When determining that H is less than predetermined threshold value, the weights for determining the sub-block are 1.
The method and device handled using image white balance provided in an embodiment of the present invention, is had the advantages that：
When the first distance Curve and second distance curve are established in preset color temperature coordinate system, the colour temperature of fluorescent light source is included in colour temperature
Between first distance Curve and second distance curve of curve the same side, also, according to each color lump in pending image pre-
If the near-infrared intensity of the position and pending image in colour temperature coordinate system, determining the weights of each sub-block, so as to treat place
Manage image and carry out white balance processing, so when carrying out the processing of image white balance, pass through the position for considering sub-block and pending figure
The near-infrared intensity of picture, the scene comprising fluorescent light source is taken into account, automatically image can be carried out according to current scene
White balance processing, so as to the compatible scene of fluorescent light source, the accuracy of image white balance is improved to a certain extent.
The present invention is the flow with reference to method according to embodiments of the present invention, equipment (system) and computer program product
Figure and/or block diagram describe.It should be understood that can be by every first-class in computer program instructions implementation process figure and/or block diagram
Journey and/or the flow in square frame and flow chart and/or block diagram and/or the combination of square frame.These computer programs can be provided
The processors of all-purpose computer, special-purpose computer, Embedded Processor or other programmable data processing devices is instructed to produce
A raw machine so that produced by the instruction of computer or the computing device of other programmable data processing devices for real
The device for the function of being specified in present one flow of flow chart or one square frame of multiple flows and/or block diagram or multiple square frames.
These computer program instructions, which may be alternatively stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that the instruction being stored in the computer-readable memory, which produces, to be included referring to
Make the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one square frame of block diagram or
The function of being specified in multiple square frames.
These computer program instructions can be also loaded into computer or other programmable data processing devices so that counted
Series of operation steps is performed on calculation machine or other programmable devices to produce computer implemented processing, so as in computer or
The instruction performed on other programmable devices is provided for realizing in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in individual square frame or multiple square frames.
Although preferred embodiments of the present invention have been described, but those skilled in the art once know basic creation
Property concept, then can make other change and modification to these embodiments.So appended claims be intended to be construed to include it is excellent
Select embodiment and fall into having altered and changing for the scope of the invention.
Obviously, those skilled in the art can carry out the essence of various changes and modification without departing from the present invention to the present invention
God and scope.So, if these modifications and variations of the present invention belong to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprising including these changes and modification.
Claims (10)
- A kind of 1. image white balancing treatment method, it is characterised in that including：Determine near-infrared intensity corresponding to pending image；The pending image is divided into multiple sub-blocks, and determines each position of the sub-block in preset color temperature coordinate system To put, the preset color temperature coordinate system includes colour temperature curve, and in every side of the colour temperature curve both sides according to first Two the first distance Curves and second distance curve that distance and second distance are established, first distance are less than second distance, The colour temperature of fluorescent light source is between first distance Curve of described colour temperature curve the same side and second distance curve；According to the position of the near-infrared intensity and each sub-block in the preset color temperature coordinate system, it is determined that corresponding to sub-block Weights；The r channel gains and b channel gains of pending image according to the weight computing of each sub-block, and by g channel gains It is arranged to 1；The pending image is carried out according to the r channel gains, g channel gains and b channel gains of the pending image White balance processing；Wherein, the position according to the near-infrared intensity and each sub-block in the preset color temperature coordinate system, it is determined that corresponding The weights of sub-block, are specifically included：For each sub-block, judge whether position of the sub-block in the preset color temperature coordinate system be same positioned at the colour temperature curve Between the first distance Curve and second distance curve of side；If it is, the ratio H of the near-infrared intensity and the default three primary color components of the sub-block is determined, and according to H and default threshold The comparative result of value, determines the weights of the sub-block, and the default three primary color components are the r components average value or the sub-block of the sub-block G components average value or the sub-block b component average values；If not, when determining that position of the sub-block in the preset color temperature coordinate system is between two the first distance Curves, The weights for determining the sub-block are 1；Determine position of the sub-block in the preset color temperature coordinate system and the colour temperature curve away from During from more than second distance, the weights for determining the sub-block are 0.
- 2. the method as described in claim 1, it is characterised in that determine near-infrared intensity corresponding to pending image, specific bag Include：Treated described in aperture time, the collection of described image collecting device when gathering the pending image according to image capture device The voltage of light-sensitive device when multiplication factor and described image collecting device when handling image gather the pending image, really Near-infrared intensity corresponding to fixed pending image, the voltage of the light-sensitive device are turned by light-sensitive device after the stimulation of near-infrared composition Get in return.
- 3. method as claimed in claim 2, it is characterised in that near-infrared corresponding to pending image is determined using equation below Intensity：AvgNIR=rawNIR × shut × gainWherein, avgNIR represents near-infrared intensity corresponding to pending image, and rawNIR represents the collection of described image collecting device The voltage of light-sensitive device during the pending image, shut represent that described image collecting device gathers the pending image When aperture time, gain represents multiplication factor when described image collecting device gathers the pending image.
- 4. the method as described in claim 1, it is characterised in that the preset color temperature coordinate system is established in the following way：Respectively using the first ratio r of three primary color components/g and three primary color components the second ratio b/g as abscissa and ordinate, establish pre- If colour temperature coordinate system；Then, it is determined that each position of the sub-block in preset color temperature coordinate system, is specifically included：For each sub-block, r components sum, g components sum and the b component sums of all pixels point in the sub-block are calculated；According to the number of pixel in the sub-block, r components average value, g components average value and the b components of the sub-block are calculated respectively Average value；Using the r components average value ratio of three primary color components first corresponding as the sub-block with the ratio of g component average values, b is divided The ratio of average value and g component average values is measured as the corresponding ratio of three primary color components second of the sub-block；According to the ratio of three primary color components second corresponding to the ratio of three primary color components first corresponding to the sub-block and the sub-block, it is determined that Position of the sub-block in preset color temperature coordinate system.
- 5. the method as described in claim 1, it is characterised in that according to H and the comparative result of predetermined threshold value, determine the sub-block Weights, specifically include：When determining that H is more than or equal to predetermined threshold value, the weights for determining the sub-block are 0；When determining that H is less than predetermined threshold value, the weights for determining the sub-block are 1.
- A kind of 6. image white balance processing equipment, it is characterised in that including：Strength determining unit, for determining near-infrared intensity corresponding to pending image；Position determination unit, for the pending image to be divided into multiple sub-blocks, and determine each sub-block default Position in colour temperature coordinate system, the preset color temperature coordinate system include colour temperature curve, and in the colour temperature curve both sides Two the first distance Curves and second distance curve established per side according to the first distance and second distance, described first away from From less than second distance, the first distance Curve and second distance of the colour temperature of fluorescent light source in described colour temperature curve the same side are bent Between line；Weights determining unit, for the position according to the near-infrared intensity and each sub-block in the preset color temperature coordinate system Put, it is determined that the weights of corresponding sub-block；Weight calculation unit, r channel gains and b passages for pending image described in the weight computing according to each sub-block increase Benefit, and g channel gains are arranged to 1；Processing unit, treated for the r channel gains according to the pending image, g channel gains and b channel gains to described Handle image and carry out white balance processing；Wherein, the weights determining unit is specifically used for：For each sub-block, judge whether position of the sub-block in the preset color temperature coordinate system be same positioned at the colour temperature curve Between the first distance Curve and second distance curve of side；If it is, determine the default of the near-infrared intensity and the sub-block The ratio H of three primary color components, and according to H and the comparative result of predetermined threshold value, determine the weights of the sub-block, the default three primary colors Component is the r components average value or the g components average value of the sub-block or the b component average values of the sub-block of the sub-block；If not, really When fixed position of the sub-block in the preset color temperature coordinate system is between two the first distance Curves, the power of the sub-block is determined It is worth for 1；Determine that position of the sub-block in the preset color temperature coordinate system and the distance of the colour temperature curve are more than second distance When, the weights for determining the sub-block are 0.
- 7. device as claimed in claim 6, it is characterised in that the strength determining unit is specifically used for：Treated described in aperture time, the collection of described image collecting device when gathering the pending image according to image capture device The voltage of light-sensitive device when multiplication factor and described image collecting device when handling image gather the pending image, really Near-infrared intensity corresponding to fixed pending image, the voltage of the light-sensitive device are turned by light-sensitive device after the stimulation of near-infrared composition Get in return.
- 8. device as claimed in claim 7, it is characterised in that the strength determining unit is determined pending using equation below Near-infrared intensity corresponding to image：AvgNIR=rawNIR × shut × gainWherein, avgNIR represents near-infrared intensity corresponding to pending image, and rawNIR represents the collection of described image collecting device The voltage of light-sensitive device during the pending image, shut represent that described image collecting device gathers the pending image When aperture time, gain represents multiplication factor when described image collecting device gathers the pending image.
- 9. device as claimed in claim 6, it is characterised in that the position determination unit is additionally operable to：The preset color temperature coordinate system is established in the following way：Respectively using the first ratio r of three primary color components/g and three primary color components the second ratio b/g as abscissa and ordinate, establish pre- If colour temperature coordinate system；Then, the position determination unit is specifically used for it is determined that during position of each sub-block in preset color temperature coordinate system：For each sub-block, r components sum, g components sum and the b component sums of all pixels point in the sub-block are calculated；According to the number of pixel in the sub-block, r components average value, g components average value and the b components of the sub-block are calculated respectively Average value；Using the r components average value ratio of three primary color components first corresponding as the sub-block with the ratio of g component average values, b is divided The ratio of average value and g component average values is measured as the corresponding ratio of three primary color components second of the sub-block；According to the ratio of three primary color components second corresponding to the ratio of three primary color components first corresponding to the sub-block and the sub-block, it is determined that Position of the sub-block in preset color temperature coordinate system.
- 10. device as claimed in claim 6, it is characterised in that the weights determining unit is in the ratio according to H and predetermined threshold value Relatively result, when determining the weights of the sub-block, it is specifically used for：When determining that H is more than or equal to predetermined threshold value, the weights for determining the sub-block are 0；When determining that H is less than predetermined threshold value, the weights for determining the sub-block are 1.
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| CN201610261027.5A CN105872510B (en) | 2016-04-25 | 2016-04-25 | A kind of image white balancing treatment method and device |
| EP17788723.9A EP3449628B1 (en) | 2016-04-25 | 2017-04-24 | Methods, systems, and media for image white balance adjustment |
| PCT/CN2017/081617 WO2017186071A1 (en) | 2016-04-25 | 2017-04-24 | Methods, systems, and media for image white balance adjustment |
| US16/095,979 US10805588B2 (en) | 2016-04-25 | 2017-04-24 | Methods, systems, and media for image white balance adjustment |
| US17/067,700 US11363244B2 (en) | 2016-04-25 | 2020-10-11 | Methods, systems, and media for image white balance adjustment |
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| US10805588B2 (en) | 2016-04-25 | 2020-10-13 | Zhejiang Dahua Technology Co., Ltd. | Methods, systems, and media for image white balance adjustment |
| CN108024106B (en) * | 2016-11-04 | 2019-08-23 | 上海富瀚微电子股份有限公司 | Support the color correction device and method of RGBIR and RGBW format |
| CN107682685B (en) * | 2017-10-30 | 2019-03-08 | Oppo广东移动通信有限公司 | White balancing treatment method and device, electronic device and computer readable storage medium |
| US11212498B2 (en) * | 2018-12-11 | 2021-12-28 | Intel Corporation | Infrared crosstalk correction for hybrid RGB-IR sensors |
| TWI715142B (en) | 2019-08-07 | 2021-01-01 | 瑞昱半導體股份有限公司 | Image sensing device and method for auto white balance therefor |
| CN113452980B (en) * | 2020-03-24 | 2023-03-14 | Oppo广东移动通信有限公司 | Image processing method, terminal and storage medium |
| CN115118946A (en) * | 2021-03-22 | 2022-09-27 | 北京小米移动软件有限公司 | White balance correction method, device and storage medium |
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| JP2003169341A (en) * | 2001-09-19 | 2003-06-13 | Fuji Film Microdevices Co Ltd | Color image pickup unit |
| JP4033140B2 (en) * | 2004-02-10 | 2008-01-16 | カシオ計算機株式会社 | Imaging apparatus, white balance control method, and white balance control program |
| CN1694543A (en) * | 2004-05-09 | 2005-11-09 | 天瀚科技股份有限公司 | Method of automatic detection and processing main colour system of white balance |
| CN103227928B (en) * | 2013-03-29 | 2015-04-29 | 华为技术有限公司 | White balance adjusting method and device |
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