CN106488209A - A kind of color calibration method of the RGB IR imageing sensor based on infrared environmental - Google Patents
A kind of color calibration method of the RGB IR imageing sensor based on infrared environmental Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N9/00—Details of colour television systems
- H04N9/64—Circuits for processing colour signals
- H04N9/646—Circuits for processing colour signals for image enhancement, e.g. vertical detail restoration, cross-colour elimination, contour correction, chrominance trapping filters
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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
Abstract
A kind of color calibration method of the RGB IR imageing sensor based on infrared environmental, it comprises the following steps：1) input RGB IR image from RGB IR imageing sensor, interpolation processing is carried out to this RGB IR image, is calculated the RGB channel of each pixel position and the numerical value of IR passage, obtains RGB the and IR image in full width face；2) R, G, channel B numerical value are deducted the numerical value of the IR passage of correspondence position, obtain the numerical value of the actual RGB channel of each pixel position, that is, obtain the RGB channel value filtering infrared light component；3) to step 2) R, G, channel B carry out WB colour temperature and CCM color correction, the RGB image after output calibration.The inventive method advantage is not use IR CUT to can reach the real-time elimination impact to RGB channel for multiple infrared components, reaches the impact to RGB channel of the colour temperature and color that correct visible ray；Infrared component can be separated in real time by direct computing method, calculating correction matrix that need not be numerous and diverse, step is more succinct, and controllability is higher, and the adaptivity of infrared environmental is more preferable.
Description
Technical field
A kind of image color correction method involved in the present invention, more particularly, to a kind of RGB-IR figure based on many infrared environmental
As the color calibration method of sensor, can be applicable to the technical fields such as security protection, vehicle-carried mobile, home security, home furnishings intelligent.
Background technology
Safety monitoring, in order to realize 24 hours monitoring videos, had both needed to utilize infrared light filling in the case that ambient light illumination is low
Realize night vision technology, need to eliminate the impact to RGB channel for the infrared light again in the case of ambient light illumination is sufficient.Wide in the industry at present
A kind of method of general employing is built-in one group double optical-filter switcher (IR-CUT) in camera lens group.IR-CUT relies on light
The change of line, to switch optical filter, in the strong environment of light, automatically turns on cutoff filter, by optical filter from entering
Penetrate and in light, filter out infrared light；In the weak environment of light, automatically remove cutoff filter, using RGB channel to infrared
The response of light lifts the low light effect of imageing sensor, thus realizing daytime and the switching of night monitor mode.This method energy
Enough realize multi-spectral imaging well, but built-in mechanical IR-CUT not only can increase volume and the cost of video camera,
And the increase with access times, the stability of video camera and reliability also can gradually be deteriorated.Therefore, remove IR-CUT, profit
Separately obtain RGB and IR image with RGB-IR imageing sensor and will have bigger advantage.
Additionally, the change of various environmental factorss all can cause the difference of colour temperature.Colour temperature is higher, photochromic more blue；Colour temperature is got over
Low then more partially red.And the visual system of people has color constancy, environmental factorss can be eliminated to a certain extent to color
Impact, thus the correctly intrinsic color of perceptual object itself.But photographic head does not but possess such adaptive ability.For
Press close to the visual standards of people, existing image processing techniquess are passed through white balance (White Balance, abbreviation WB) to correct color
Temperature is so that the image color shooting under various light and the image color seen of human eye are pressed close to.Further, since different biographies
Sensor is also different with the response that the visual system phase of people compares color to the response of different light colors, so needing also exist for
The color of image is done and corrects with the vision close to people accordingly.The global image color calibration method commonly used at present is color school
Positive matrices (Color Correction Matrix, abbreviation CCM).
RGB-IR is a kind of color filter array (Color Filter Array, abbreviation CFA) of imageing sensor, its with
The Bayer type form CFA that imageing sensor commonly uses compares, and the part-green filter in Bayer type form is replaced by RGB-IR
It is changed to infrared filter (Infrared, abbreviation IR).The imageing sensor of RGB-IR type form passes with respect to Bayer type format-pattern
The advantage of sensor is can to sense visible ray and infrared light simultaneously.Fig. 1 is typical RGB-IR filter arrangement mode.Below for row
Literary composition is convenient, unifies the covered red filter of institute, green filter, blue filter and infrared filter on imageing sensor in literary composition
It is referred to as R passage, G passage, channel B and IR passage successively.
Fig. 2 is a kind of quantization response curve of typical RGB-IR imageing sensor.Due to pursuing low light effect and image
The reasons such as sensor manufacturing process, RGB channel also can sense infrared light while sensing visible ray (400～650nm)
(850nm), in the same manner, IR passage also can sense visible ray while sensing infrared light.Therefore, seek simple and feasible correction side
Method, eliminates the impact to RGB channel for the infrared light and is extremely important.
Correct colour temperature, the method for color change of infrared component and visible ray present in prior art simultaneously, but it is not
The energy multiple infrared component of real time correction, and the method correcting is complicated, the low shortcoming of controllability.
Chinese patent application CN103686111A discloses a kind of " color calibration method based on RGBIR imageing sensor
And device ", although this bearing calibration achieves the function of color correction to a certain extent, it is by calculating correction matrix
Method, step is loaded down with trivial details, and the adaptivity of different infrared environmental is poor, and substantially can not correct multiple infrared components simultaneously.
Content of the invention
The invention aims to overcoming above-mentioned the deficiencies in the prior art, and one kind is provided to be based on infrared environmental
Under RGB-IR imageing sensor color calibration method, the impact to RGB channel for the multiple infrared component of the method real time correction,
And correct the impact of the colour temperature of visible ray, color change, advantage be not use IR-CUT can reach real-time eliminate multiple
The impact to RGB channel for the infrared component, simultaneously compatible single infrared environment, thus reach colour temperature and the color of correction visible ray
Impact to RGB channel.
To achieve these goals, the technical solution used in the present invention is：
A kind of color calibration method of the RGB-IR imageing sensor based on infrared environmental, it comprises the following steps：
1) input RGB-IR image, interpolation processing is carried out to this RGB-IR image, is calculated each pixel position
RGB channel and the numerical value of IR passage, obtain RGB the and IR image in full width face；
2) R, G, channel B numerical value are deducted the numerical value of the IR passage of correspondence position, obtain the reality of each pixel position
The numerical value of RGB channel, that is, obtain the RGB channel value filtering infrared light component；
3) to step 2) R, G, channel B carry out WB colour temperature and CCM color correction, the RGB image after output calibration.
Further it is improved by, described interpolation processing is linear interpolation or gradient interpolation.
Further it is improved by, described RGB-IR imageing sensor collocation optical filter and optical filter, it senses wavelength
Visible ray for 400-650nm and sensing wavelength 850nm infrared light, IR passage also senses visible while sensing infrared light
Light.
Further be improved by, above-mentioned steps 2) in obtain filter infrared light component RGB channel value method as follows：
Calculate image R, G, B and IR four-way pixel value, as the R of formula one0、G0、B0、IR0, wherein R0、G0、B0For each
The visible light component of passage (R, G, B) and infrared light component (IR0) superposition, IR0For the superposition of multiple infrared components, i.e. R0=R+
IR0, G0=G+IR0, B0=B+IR0, by the R of original image0、G0、B0Passage numerical value deducts the IR of correspondence position0The numerical value of passage, obtains
The R arrivingc、Gc、BcFor eliminating the RGB channel value of IR component；
Formula one：
Further be improved by, infrared light supply quantity can be one or two or multiple, if an infrared light supply bar
IR in formula one under part0=IRa；If the IR in formula one under the conditions of multiple infrared light supplies0=IRa+IRb+IRc+IRd+ ..., lead to
Cross formula one and calculate acquisition RGB channel value,
Further it is improved by, in formula one, α, β, γ are controllable factor, that is,：Rc=R0-α*IR0, wherein 0≤α≤1；
Gc=G0-β*IR0, wherein 0≤β≤1；Bc=B0-γ*IR0, wherein 0≤γ≤1.
When α=0, represent the infrared component not eliminating R passage；When α=1, represent the whole infrared components eliminating R passage；
As 0 ＜ α ＜ 1, eliminate a certain proportion of infrared component of R passage.In the same manner, when β=0, represent the infrared component not eliminating G passage；
When β=1, represent the whole infrared components eliminating G passage；As 0 ＜ β ＜ 1, eliminate a certain proportion of infrared component of G passage.Also same
Reason, when γ=0, represents the infrared component not eliminating channel B；When γ=1, represent the whole infrared components eliminating channel B；When 0
＜ γ ＜ 1, eliminates a certain proportion of infrared component of channel B；By configuring the size of α, β, γ, to eliminate corresponding R, G, B and to lead to
The IR component of the corresponding proportion in road.Additionally, the brightness of controllable factor α, β, γ and current pixel point is closely related.
The present invention passes through to correct twice, corrects eliminate original RGB-IR image in real time infrared one or more point for the first time
The impact to RGB channel for the amount, second-order correction eliminates the impact to RGB channel of the colour temperature and color of visible ray, completes to many
The color correction of the RGB-IR imageing sensor of infrared environmental, makes the color of image after correction press close to the visual standards of people.
Present invention advantage compared with prior art：1st, the inventive method had both gone for the RGB- of many infrared environmental
The color correction of IR imageing sensor, is also compatible with the color correction of the RGB-IR imageing sensor under single infrared environmental.2nd, straight
Connect calculating method and can separate infrared component in real time, calculating correction matrix that need not be numerous and diverse, step is more succinct, and controllability is higher, infrared
The adaptivity of environment is more preferable.3rd, the inventive method eliminates the impact to RGB channel for the infrared component simultaneously, also corrects visible ray
The impact to RGB channel of colour temperature and color change.
Brief description
Fig. 1 is a kind of typical RGB-IR filter arrangement mode.
Fig. 2 is a kind of quantization response curve of typical RGB-IR imageing sensor.
Fig. 3 is the color calibration method block diagram of the present invention.
Fig. 4 is RGB-IR imageing sensor color calibration method example under the multiple infrared environmental of the present invention.
Fig. 5 is RGB-IR imageing sensor color calibration method example under a kind of infrared environmental of the present invention.
Specific embodiment
Below embodiments of the invention are further described, following examples are only carried out furtherly to the application
Bright, should not be construed as the restriction to the application.
A kind of block diagram of the color calibration method of RGB-IR imageing sensor based on infrared environmental as shown in Figure 3, it
Comprise the following steps：
1) input RGB-IR image from RGB-IR imageing sensor, interpolation processing is carried out to this RGB-IR image, calculates
To the RGB channel of each pixel position and the numerical value of IR passage, obtain RGB the and IR image in full width face；
2) R, G, channel B numerical value are deducted the numerical value of the IR passage of correspondence position, obtain the reality of each pixel position
The numerical value of RGB channel, that is, obtain the RGB channel value filtering infrared light component；
3) to step 2) R, G, channel B carry out WB colour temperature and CCM color correction, the RGB image after output calibration.
Further being improved by of described color calibration method, described interpolation processing includes linear interpolation and gradient is inserted
Value.
Described RGB-IR imageing sensor collocation optical filter and optical filter, its sensing wavelength is the visible of 400-650nm
Light and sensing wavelength 850nm infrared light, IR passage also senses visible ray while sensing infrared light.
Step 2) obtain filter infrared light component RGB channel value method as follows：
Calculate image R, G, B and IR four-way pixel value, as the R of formula one0、G0、B0、IR0, wherein R0、G0、B0For each
The visible light component of passage (R, G, B) and infrared light component (IR0) superposition, IR0For the superposition of multiple infrared components, i.e. R0=R+
IR0, G0=G+IR0, B0=B+IR0, by the R of original image0、G0、B0Passage numerical value deducts the IR of correspondence position0The numerical value of passage, obtains
The R arrivingc、Gc、BcFor eliminating the RGB channel value of IR component；
Formula one：
Infrared light supply quantity can be one or two or multiple, if IR in formula one under the conditions of an infrared light supply0=
IRa；If the IR in formula one under the conditions of multiple infrared light supplies0=IRa+IRb+IRc+IRd+ ..., calculated by formula one and obtain
RGB channel value, wherein IRa, IRb, IRc, IRd... under many infrared environmental, the response of the infrared component to light source for this pixel.
In formula one, α, β, γ are controllable factor, 0≤α≤1；0≤β≤1；0≤γ≤1, when α=0, represents and does not eliminate R
The infrared component of passage；When α=1, represent the whole infrared components eliminating R passage；As 0 ＜ α ＜ 1, eliminate R passage certain proportion
Infrared component；
In the same manner, when β=0, represent the infrared component not eliminating G passage；When β=1, represent and eliminate the whole infrared of G passage
Component；As 0 ＜ β ＜ 1, eliminate a certain proportion of infrared component of G passage；
When γ=0, represent the infrared component not eliminating channel B；When γ=1, represent eliminate channel B whole infrared point
Amount；As 0 ＜ γ ＜ 1, eliminate a certain proportion of infrared component of channel B；By configuring the size of α, β, γ, to eliminate corresponding R,
G, the IR component of the corresponding proportion of channel B.
Embodiment 1：
As shown in figure 4, the color calibration method of the RGB-IR imageing sensor under many infrared environmental, it includes walking as follows
Suddenly：
D65 light source and A light source are irradiated A, B region respectively, the bimodal optical filter of RGB-IR imageing sensor collocation shoots to be put
Put the colour atla in A, B region；
Linear interpolation is carried out to the original image of RGB-IR imageing sensor response, calculates image four-way pixel value, make
R for formula one0、G0、B0、IR0.Wherein R0、G0、B0For the superposition of the visible light component of each passage and infrared light component, IR0For many
(this embodiment lists the environment of two kinds of infrared components, but this method is not limited to two kinds infrared point for the superposition of kind infrared component
The environment of amount, but also two or more).I.e. R0=R+IR0、G0=G+IR0、B0=B+IR0、IR0=IRa+IRb.Wherein IRaFor
The response to A light source infrared component for this pixel, IRbFor the response to D65 light source infrared component for this pixel；
Formula one：
As shown in formula one, the R of original image0、G0、B0Passage numerical value deducts the IR of correspondence position0The numerical value of passage, obtains
Rc、Gc、BcFor eliminating the RGB channel value of IR component
As shown in formula one, the R of original image0、G0、B0Passage numerical value deducts the IR of correspondence position0The numerical value of passage, obtains
Rc、Gc、BcFor eliminating the RGB channel value of IR component.Wherein α, β, γ are controllable factor (0≤α≤1；0≤β≤1；0≤γ≤
1).When α=0, represent the infrared component not eliminating R passage；When α=1, represent the whole infrared components eliminating R passage；As 0 ＜ α
＜ 1, eliminates a certain proportion of infrared component of R passage.When β=0, represent the infrared component not eliminating G passage；When β=1, represent
Eliminate whole infrared components of G passage；As 0 ＜ β ＜ 1, eliminate a certain proportion of infrared component of G passage.When γ=0, represent not
Eliminate the infrared component of channel B；When γ=1, represent the whole infrared components eliminating channel B；As 0 ＜ γ ＜ 1, eliminate channel B
A certain proportion of infrared component.The IR of the corresponding proportion of corresponding R, G, channel B by configuring the size of α, β, γ, can be eliminated
Component.The present embodiment controllable factor default configuration be 1 value, be completely eliminated RGB channel infrared component impact (timing can basis
It is actually needed adjustment controllable parameter to eliminate the infrared light component of different proportion), the present invention is led to the RGB eliminating infrared component
Road image carries out WB and CCM correction, solves the colour cast problem that the colour temperature of visible ray and color change cause.Embodiment of the present invention institute
The many infrared environmental stated are not limited only to mixing light source that D65 light source and A color temperature light sources are formed or other kinds of mixed
Closing light source, and many infrared environmental such as, indoor and outdoors the dusk time-division.
Embodiment 2：
As shown in figure 5, the color calibration method of the RGB-IR imageing sensor under single infrared environmental, it includes as follows
Step：
D65 light source (being not limited only to D65 light source, be also applied for any monochromater) is irradiated the area placing colour atla
Domain, the bimodal optical filter of RGB-IR imageing sensor collocation shoots the colour atla of D65 light source irradiation area；
Linear interpolation is carried out to the original image of RGB-IR imageing sensor response, calculates image four-way pixel value, make
R for formula one0、G0、B0、IR0.Wherein R0、G0、B0For the superposition of the visible light component of each passage and infrared light component, IR0For one
Plant infrared component.I.e. R0=R+IR0、G0=G+IR0、B0=B+IR0.Wherein IR0For this pixel to D65 light source infrared component
Response；
Formula one：
As shown in formula one, the R of original image0、G0、B0Passage numerical value deducts the IR of correspondence position0The numerical value of passage, obtains
Rc、Gc、BcFor eliminating the RGB channel value of IR component.Wherein α, β, γ are controllable factor (0≤α≤1；0≤β≤1；0≤γ≤
1).When α=0, represent the infrared component not eliminating R passage；When α=1, represent the whole infrared components eliminating R passage；As 0 ＜ α
＜ 1, eliminates a certain proportion of infrared component of R passage.When β=0, represent the infrared component not eliminating G passage；When β=1, represent
Eliminate whole infrared components of G passage；As 0 ＜ β ＜ 1, eliminate a certain proportion of infrared component of G passage.When γ=0, represent not
Eliminate the infrared component of channel B；When γ=1, represent the whole infrared components eliminating channel B；As 0 ＜ γ ＜ 1, eliminate channel B
A certain proportion of infrared component.The IR of the corresponding proportion of corresponding R, G, channel B by configuring the size of α, β, γ, can be eliminated
Component.The present embodiment controllable factor default configuration be 1 value, be completely eliminated RGB channel infrared component impact (timing can basis
It is actually needed adjustment controllable parameter to eliminate the infrared light component of different proportion).The present invention is led to the RGB eliminating infrared component
Road image carries out WB and CCM correction, solves the colour cast problem that the colour temperature of visible ray and color change cause.
Interpolation method described in the embodiment of the present invention is not limited only to linear interpolation, also includes the additive methods such as gradient difference value.
The above is only the preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-described embodiment,
All technical schemes belonging under thinking of the present invention belong to protection scope of the present invention.It should be pointed out that for the art
For those of ordinary skill, some improvements and modifications without departing from the principles of the present invention, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (6)
1. a kind of color calibration method of the RGB-IR imageing sensor based on infrared environmental is it is characterised in that include following walking
Suddenly：
1) input RGB-IR image from RGB-IR imageing sensor, interpolation processing is carried out to this RGB-IR image, be calculated every
The RGB channel of individual pixel position and the numerical value of IR passage, obtain RGB the and IR image in full width face；
2) R, G, channel B numerical value are deducted the numerical value of the IR passage of correspondence position, the actual RGB obtaining each pixel position leads to
The numerical value in road, that is, obtain the RGB channel value filtering infrared light component；
3) to step 2) R, G, channel B carry out WB colour temperature and CCM color correction, the RGB image after output calibration.
2. the color calibration method of a kind of RGB-IR imageing sensor based on infrared environmental according to claim 1, its
It is characterised by：Described interpolation processing is linear interpolation or gradient interpolation.
3. the color calibration method of a kind of RGB-IR imageing sensor based on infrared environmental according to claim 1, its
It is characterised by：Described RGB-IR imageing sensor collocation optical filter and optical filter, its sensing wavelength is the visible of 400-650nm
Light and sensing wavelength 850nm infrared light, IR passage also senses visible ray while sensing infrared light.
4. the color calibration method of a kind of RGB-IR imageing sensor based on infrared environmental according to claim 1, its
Be characterised by, step 2) obtain filter infrared light component RGB channel value method as follows：
Calculate image R, G, B and IR four-way pixel value, as the R of formula one0、G0、B0、IR0, wherein R0、G0、B0For each passage
It can be seen that light component (R, G, B) and infrared light component (IR0) superposition, IR0For the superposition of multiple infrared components, i.e. R0=R+IR0, G0
=G+IR0, B0=B+IR0, by the R of original image0、G0、B0Passage numerical value deducts the IR of correspondence position0The numerical value of passage, obtains
Rc、Gc、BcFor eliminating the RGB channel value of IR component；
Formula one：
5. the color calibration method of a kind of RGB-IR imageing sensor based on infrared environmental according to claim 4, its
It is characterised by：Infrared light supply quantity can be one or two or multiple, if IR in formula one under the conditions of an infrared light supply0=
IRa；If the IR in formula one under the conditions of multiple infrared light supplies0=IRa+IRb+IRc+IRd+ ..., calculated by formula one and obtain
RGB channel value, wherein IRa, IRb, IRc, IRd... under many infrared environmental, the response of the infrared component to light source for this pixel.
6. the color calibration method of a kind of RGB-IR imageing sensor based on infrared environmental according to claim 4, its
It is characterised by：In formula one, α, β, γ are controllable factor, 0≤α≤1；0≤β≤1；0≤γ≤1, when α=0, represents and does not eliminate R
The infrared component of passage；When α=1, represent the whole infrared components eliminating R passage；As 0 ＜ α ＜ 1, eliminate R passage certain proportion
Infrared component；
In the same manner, when β=0, represent the infrared component not eliminating G passage；When β=1, represent the whole infrared components eliminating G passage；
As 0 ＜ β ＜ 1, eliminate a certain proportion of infrared component of G passage；
When γ=0, represent the infrared component not eliminating channel B；When γ=1, represent the whole infrared components eliminating channel B；When 0
＜ γ ＜ 1, eliminates a certain proportion of infrared component of channel B；By configuring the size of α, β, γ, to eliminate corresponding R, G, B and to lead to
The IR component of the corresponding proportion in road.
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