CN105446049B - Imaging device and imaging method - Google Patents
Imaging device and imaging method Download PDFInfo
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- CN105446049B CN105446049B CN201410444433.6A CN201410444433A CN105446049B CN 105446049 B CN105446049 B CN 105446049B CN 201410444433 A CN201410444433 A CN 201410444433A CN 105446049 B CN105446049 B CN 105446049B
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Abstract
The present invention provides a kind of imaging device and imaging method.Wherein, imaging device includes: polarised light generating device, for incident ray to be converted to the polarised light with single polarization direction；At least one optical unit, at least one described optical unit include at least one automatically controlled polarised light rotary device and at least one polarization optical lens；Driving circuit, at least one described automatically controlled polarised light rotary device change the polarization direction of the polarised light according to the driving signal that the driving circuit provides；The side far from the polarised light generating device of at least one optical unit is arranged in non-polarized light lens group；And image acquisition units, it is modulated for acquiring via the automatically controlled polarised light rotary device and passes through the polarised light of the non-polarized light lens group and generate image.Imaging device and method of the invention can be switched fast the polarization direction for being incident to polarised light thereon, thus the image of the continuous different focused conditions of quick obtaining.
Description
Technical field
The present invention relates to lens imaging technical fields, in particular to a kind of imaging device and a kind of imaging method.
Background technique
In traditional imaging device, the corresponding fixed focused condition of the image of generation is only in focal plane
A clearly image could be presented in object of the front and back within the scope of some in the picture, this range is also widely referred to as the depth of field,
Object except field depth then shows a fuzzy image.It is being imaged, the fields such as machine vision and image procossing,
Many applications are often desirable to obtain the image of different focused conditions in synchronization.If we can obtain synchronization or close
Image under the different focused conditions of synchronization, then can will use in each image clearly it is partially synthetic go out the big depth of field
Image.If we can be quickly obtained the image under different focused conditions, Depth-from-Focus (J.Ens can also be used
and P.Lawrence.An investigation of methods for determining depth from
Focus.IEEE Trans.Pattern Anal.Mach.Intell., 15:97-108,1993.) or Depth-from-
defocus(A.P.Pentland.1987.A New Sense for Depth of Field.IEEE Trans.Pattern
Anal.Mach.Intell.9,4 (April1987), 523-531) method carry out scene depth measurement etc..
In modern imaging system, especially digital camera, cell-phone camera head etc., Voice Coil Motor (VCM), i.e.,
Voice coil motor is widely used, for pushing the lens in imaging system, so that changing image distance realizes autozoom or focusing
Purpose.However it is a purely mechanic movement that VCM, which pushes lens, drive system is a closed loop feedback system, is focused from one
Condition is takeed a long time to another focused condition, can not be quickly obtained the image of continuous different focused conditions.
Therefore, it how to be quickly obtained the image of continuous different focused conditions, becomes current technical problem urgently to be resolved.
Summary of the invention
The present invention is based on above-mentioned technical problem, proposes a kind of new imaging device and imaging method.
In view of this, the invention proposes a kind of imaging device, comprising: polarised light generating device is used for incident ray
Be converted to the polarised light with single polarization direction；At least one optical unit, at least one described optical unit include at least
One automatically controlled polarised light rotary device and at least one polarization optical lens, the polarised light be successively incident to it is described at least one
Automatically controlled polarised light rotary device and at least one described polarization optical lens；Driving circuit, is connected to that described at least one is automatically controlled
Polarised light rotary device, at least one described automatically controlled polarised light rotary device change institute according to the driving signal that driving circuit provides
State the polarization direction of polarised light；Non-polarized light lens group, the polarised light are incident to after at least one described optical unit
The non-polarized light lens group；And image acquisition units, for acquiring via the automatically controlled polarised light rotary device modulation simultaneously
Polarised light by the non-polarized light lens group and generate image.
In the above-described embodiment, the automatically controlled polarised light rotary device can be switched fast the polarization for being incident to its glazing
Direction, the polarised light of the polarised light lens focus specific direction, by adjusting the focal length for stating polarization optical lens, to quickly obtain
Take the image of continuous different focused conditions.Image under the continuous different focused conditions, can pass through DFF (Depth-
From-Focus) or the method for DFD (Depth-from-Defocus) carry out scene depth measurement etc..
In any of the above-described technical solution, it is preferred that at least one described automatically controlled polarised light rotary device is twisted-nematic
Liquid crystal cell.
In any of the above-described technical solution, it is preferred that at least one described polarization optical lens is to be made using liquid crystal material
Lens.
In any of the above-described technical solution, it is preferred that the polarization side of the polarised light for being incident to the polarization optical lens
Angle between the polarization direction for the polarised light that modulating action can be played to the polarization optical lens is 0 degree.
In any of the above-described technical solution, it is preferred that the polarization side of the polarised light for being incident to the polarization optical lens
Angle between the polarization direction for the polarised light that modulating action can be played to the polarization optical lens is 90 degree or 270 degree.
In any of the above-described technical solution, it is preferred that when the imaging device includes an optical unit, the optics list
Member includes an automatically controlled polarised light rotary device and a polarization optical lens, and when the automatically controlled polarised light rotary device makes institute
When the angle for stating the polarization direction rotation of polarised light is 0 degree, the image generated on described image acquisition unit is by by described inclined
Focus image formed by the light component for the equivalent lens modulation that optical lens and the non-polarized light lens group of shaking are formed and by institute
State the synthesis of out-of-focus image formed by the light component of non-polarized light lens group modulation.
In any of the above-described technical solution, it is preferred that when the automatically controlled polarised light rotary device makes the inclined of the polarised light
When the angle that rotates of vibration direction is 0 degree, on described image acquisition unit finally at image be expressed as formula:
I1=Img (cos (θ) r, f (fp, fo, d))+Img ((1-cos (θ)) r, fo)
Wherein, Img (r, f) is an image function, represents light component as r, corresponding focal length be f can at picture, θ expression
It is incident to the polarization direction polarised light corresponding with the polarization optical lens of the polarised light of the automatically controlled polarised light rotary device
Angle between polarization direction, the equivalent coke of f (fp, fo, d) the statement polarization optical lens and the non-polarized light lens group
Away from fp is the focal length of the polarization optical lens, and fo is the focal length of the non-polarized light lens group, and d is the polarization optical lens
The distance between the principal point of principal point and the non-polarized light lens group.
In any of the above-described technical solution, it is preferred that when the automatically controlled polarised light rotary device is incident to described thereon
The polarization direction rotation angle of polarised light when being γ, on described image acquisition unit finally at image be expressed as public affairs
Formula:
I2=Img (cos (θ+γ) r, f (fp, fo, d))+Img ((1-cos (θ+γ)) r, fo).
In any of the above-described technical solution, it is preferred that the imaging device includes an optical unit, the optical unit
Including the multiple automatically controlled polarised light rotary devices being arranged successively and the multiple polarization optical lens being arranged successively, each automatically controlled polarization
The angle that optical rotator part will be incident to the polarization direction rotation of polarised light thereon is not identical.
In any of the above-described technical solution, it is preferred that the multiple automatically controlled polarised light rotary device is mentioned according to driving circuit
The driving signal of confession changes the angular range for being incident to the polarization direction of polarised light thereon are as follows: 0 degree to 360 degree.
In any of the above-described technical solution, it is preferred that the imaging device includes the multiple optical units being arranged successively, often
A optical unit includes at least one automatically controlled polarised light rotary device and at least one polarizes optical lens, each optical unit
The polarization optical lens of automatically controlled polarised light rotary device face adjacent optical unit.
In any of the above-described technical solution, it is preferred that the imaging device includes the multiple optical units being arranged successively, often
A optical unit includes an automatically controlled polarised light rotary device and a polarization optical lens, the automatically controlled polarization of each optical unit
The polarization optical lens of optical rotator part face adjacent optical unit, the automatically controlled polarised light rotary device face phase of each optical unit
The polarization optical lens of adjacent optical unit.
In any of the above-described technical solution, it is preferred that the imaging device includes the multiple optical units being arranged successively, until
A few optical unit includes multiple automatically controlled polarised light rotary devices and multiple polarization optical lens, each optical unit it is automatically controlled
The polarization optical lens of polarised light rotary device face adjacent optical unit, the automatically controlled polarised light rotary device of each optical unit is just
To the polarization optical lens of adjacent optical unit.
In any of the above-described technical solution, it is preferred that the imaging device includes the multiple optical units being arranged successively, often
A optical unit includes multiple automatically controlled polarised light rotary devices and multiple polarization optical lens, the automatically controlled polarization of each optical unit
The polarization optical lens of optical rotator part face adjacent optical unit, the automatically controlled polarised light rotary device face phase of each optical unit
The polarization optical lens of adjacent optical unit.
According to another aspect of the present invention, a kind of imaging method is additionally provided characterized by comprising by incident ray
Be converted to the polarised light with single polarization direction；The polarization direction of the polarised light is revolved by automatically controlled polarised light rotary device
Go to predetermined direction；At the first moment, when the automatically controlled polarised light rotary device rotates the polarization direction of the polarised light
When angle is 0 degree, acquisition is believed by the light of the automatically controlled polarised light rotary device, polarization optical lens and non-polarized light lens group
Number, the optical signal is converted into electric signal and generates the first image；At the second moment, when the automatically controlled polarised light rotary device
The angle for rotating the polarization direction of the polarised light is non-zero when spending, and acquisition is by the automatically controlled polarised light rotary device, polarization
The optical signal is converted into electric signal and generates the second image by the optical signal of optical lens and non-polarized light lens group；And
By handling the first image and second image, to obtain final image.
In any of the above-described technical solution, it is preferred that when the automatically controlled polarised light rotary device makes the inclined of the polarised light
When the angle that rotates of vibration direction is 0 degree, on described image acquisition unit finally at image be expressed as formula:
I1=Img (cos (θ) r, f (fp, fo, d))+Img ((1-cos (θ)) r, fo)
Wherein, Img (r, f) is an image function, represents light component as r, corresponding focal length be f can at picture, θ expression
It is incident to the polarization direction polarised light corresponding with the polarization optical lens of the polarised light of the automatically controlled polarised light rotary device
Angle between polarization direction, the equivalent coke of f (fp, fo, d) the statement polarization optical lens and the non-polarized light lens group
Away from fp is the focal length of the polarization optical lens, and fo is the focal length of the non-polarized light lens group, and d is the polarization optical lens
The distance between the principal point of principal point and the non-polarized light lens group.
In any of the above-described technical solution, it is preferred that when the automatically controlled polarised light rotary device makes the inclined of the polarised light
When the angle that rotates of vibration direction is γ, on described image acquisition unit finally at image be expressed as formula:
I2=Img (cos (θ+γ) r, f (fp, fo, d))+Img ((1-cos (θ+γ)) r, fo).
In any of the above-described technical solution, it is preferred that when automatically controlled polarised light rotary device is multiple, each automatically controlled polarization
The angle that optical rotator part will be incident to the polarization direction rotation of polarised light thereon is not identical, selectively controls one of them
Automatically controlled polarised light rotary device, to make to be incident to the polarization direction of polarised light thereon by the automatically controlled polarised light rotary device
It rotates to predetermined direction.
Detailed description of the invention
Fig. 1 is the structural schematic diagram for the imaging device that first embodiment of the invention provides；
Fig. 2 is that the automatically controlled polarised light rotary device in Fig. 1 rotates 0 degree to the polarization direction for being incident to polarised light thereon
Index path；
Fig. 3 is that the automatically controlled polarised light rotary device in Fig. 1 is rotated by 90 ° the polarization direction for being incident to polarised light thereon
Index path；
Fig. 4 is the structural schematic diagram for the imaging device that second embodiment of the invention provides；
Fig. 5 is the structural schematic diagram for the imaging device that third embodiment of the invention provides；
Fig. 6 is the structural schematic diagram for the imaging device that fourth embodiment of the invention provides；
Fig. 7 is the structural schematic diagram for the imaging device that fifth embodiment of the invention provides；
Fig. 8 is the flow diagram for the imaging method that sixth embodiment of the invention provides.
Specific embodiment
To better understand the objects, features and advantages of the present invention, with reference to the accompanying drawing and specific real
Applying mode, the present invention is further described in detail.It should be noted that in the absence of conflict, the implementation of the application
Feature in example and embodiment can be combined with each other.
In the following description, numerous specific details are set forth in order to facilitate a full understanding of the present invention, still, the present invention may be used also
To be implemented using other than the one described here other modes, therefore, the present invention is not limited to following public specific realities
Apply the limitation of example.
Fig. 1 is the structural schematic diagram for the imaging device 100 that first embodiment of the invention provides.The imaging device 100 wraps
It includes: 11, optical units 12 of polarised light generating device, driving circuit 13, non-polarized light lens group 14 and Image Acquisition list
Member 15.
In the present embodiment, the polarised light generating device 11 refers to that (it can be for different inclined by incident ray
The light in vibration direction) polarised light with single polarization direction is converted to, such as it can be polarizing film.
In the present embodiment, the optical unit 12 includes an automatically controlled polarised light rotary device 121 and a polarization
Optical lens 122.The automatically controlled setting of polarised light rotary device 121 is in the polarised light generating device 11 and the polarization optical lens
Between 122.The driving circuit 13 is connected to the automatically controlled polarised light rotary device 121.
The automatically controlled polarised light rotary device 121 refers to the polarization direction rotation for being incident to polarised light thereon is a certain solid
The device for determining angle applies electric signal on it by control, so that controlling the automatically controlled polarised light rotary device 121 will enter
The polarization direction for being incident upon polarised light thereon switches between two states of 0 degree of rotation and non-zero degree.It is provided according to driving circuit 13
Driving signal change the polarization direction of the polarised light.In the present embodiment, the automatically controlled polarised light rotary device 121 is to turn round
Bent nematic liquid crystal box (TN box), can high speed a certain fixed angle of change (generally 90 degree) polarised light polarization direction,
Its switching frequency is up to the 120 frames/more than second.
The polarization optical lens 122, which refers to, plays modulating action (aggtegation) only for single polarization direction, and to other
Polarization direction does not play the lens of modulating action (aggtegation), such as it can be to use the lens of liquid crystal material, such as liquid crystal
Lens.Assuming that modulating action can be played by being incident to the direction of polarized light of the polarization optical lens 122 and the polarization optical lens 122
The polarization direction of polarised light is parallel, and all light can be assembled by polarization optical lens 122 at this time.When being incident to, the polarised light is saturating
The polarization side of the polarised light of mirror 122 and the polarization optical lens 122 can play the folder between the polarization light polarization direction of modulating action
When the increaseization of angle, the light component on polarization 122 polarization direction of optical lens is reduced, thus the light quantity assembled can also subtract
It is few.When the polarization direction for the polarised light for being incident to the polarization optical lens 122 is rotated by 90 ° or at 270 degree, this light component is 0,
All polarised lights for being incident to the polarization optical lens 122 cannot be assembled by the polarization optical lens 122.It is understood that
It is that in the present embodiment, the driving circuit 13 or the polarization optical lens 122 provide driving electric signal.
The separate polarised light generating device 11 of the optical unit 12 is arranged in the non-polarized light lens group 14
Side, the non-polarized light lens group 14 are that the single lens or non-polarized light lens of converging action are played for random polarization light
Group, such as common glass lens or plastic lens.In the present embodiment, the non-polarized light lens group 14 includes one saturating
Mirror, it is to be understood that the non-polarized light lens group 14 may include two or more lens.
Described image acquisition unit 15 is arranged far from the separate polarization photogenerated of the non-polarized light lens group 14
The side of device 11.The acquisition of described image acquisition unit 15 modulates via the automatically controlled polarised light rotary device 121 and passes through institute
It states the polarised light of non-polarized light lens group 14 and generates the sensor of digital picture, such as CCD or cmos image sensor.If
External environmental light is the mixing light of near infrared light or near infrared light and natural light, then the imaging sensor 15 can be infrared biography
Sensor, or simultaneously include the sensor of visible light and the photosensitive pixel of infrared light.
It in the present embodiment, further comprise that a secondary light source 16 can be one or several visible light sources such as
Visible light LED lamp is also possible to one or several infrared or near-infrared light sources, such as infrared laser or infrared LED lamp array.
Also, according to application demand, can be placed before the secondary light source 16 can formation rule pattern grating or other can be formed with
The grating of machine pattern increases the texture of scene.
The working principle that the imaging device 100 is imaged is as follows:
External environmental light is the light without polarization state, and light injects the polarised light generating device 13 first, described inclined
Vibration photogenerated device 13 converts light into as the polarised light with single polarization direction, and then polarised light injects the automatically controlled polarised light
Rotary device 121.In the present embodiment, the automatically controlled polarised light rotary device 121 makes described according to 13 signal of driving circuit
Polarised light is rotated to predetermined direction.Fig. 2 illustrates the automatically controlled polarised light rotary device 121 to the polarised light being incident to thereon
Polarization direction does not rotate, i.e., index path when rotation angle is 0 degree.Fig. 3 illustrates the automatically controlled polarised light rotary device
121 pairs of polarised lights being incident to thereon are fully rotating, i.e., index path when rotation angle is 90 degree.Pass through the automatically controlled polarised light
Polarised light after rotary device 121 is incident on the subsequent polarization optical lens 122, using subsequent non-polarized light lens
Group 14, is finally imaged on described image acquisition unit 15.
The automatically controlled polarised light rotary device 121 can be switched fast the polarization direction for being incident to polarised light thereon, institute
The polarised light that polarization optical lens 122 focuses specific direction is stated, by adjusting the focal length for stating polarization optical lens 122, to quickly obtain
Take the image of continuous different focused conditions.Image under the continuous different focused conditions, can pass through DFF (Depth-
From-Focus) or the method for DFD (Depth-from-Defocus) carry out scene depth measurement etc..
Specifically, the process that the imaging device 100 is imaged is as follows:
Assuming that the light total amount for injecting the polarization optical lens 122 is r, a portion light component α r can be by the polarised light
Lens 122 are assembled, and the remaining light component that cannot be assembled by the polarization optical lens 122 is (1- α) r, this part light will be direct
Through the polarization optical lens 122, finally, two parts light component can be assembled by the subsequent non-polarized light lens group 14.
The polarization optical lens 122 can only play convergence for the light of a certain polarization direction, thus the size of α is by being incident to the electricity
The angle theta decision between the polarization direction of polarised light rotary device light and the polarization direction of the polarization optical lens 122 is controlled, we
There is α=cos (θ).Assuming that the focal length of the polarization optical lens 122 is fp, the focal length of the non-polarized light lens group 14 is fo, institute
Stating the distance between the principal point of polarization optical lens 122 and the principal point of the non-polarized light lens group 14 is d, then can be according to combination
Lens formula Tui get first part light component, the light component that can be assembled by the polarization optical lens 122, corresponding equivalent coke
Away fromFunction f (f1, f2 ..., fm, d1, d2 ..., dm-1) is that the equivalent focal length of compound lens calculates
Function, this function is according to known focal length of lens f1, f2 ..., the distance between fm and adjacent lens d1, d2 ..., dm-1, meter
Calculate the equivalent focal length of lens combination.The light component of remaining part, i.e., the light point that cannot be assembled by the polarization optical lens 122
Amount, corresponding focal length are fo.Image I formed by the final device meets following formula,
I=Img (α r, f (fp, fo, d))+Img ((1- α) r, fo)
Specifically, Img (r, f) is an image function, represents light component as r, corresponding focal length for f can at image.
In entire imaging process, only light component r and focal length f change, and the factor of other influences imaging is such as away from object distance is schemed
As acquisition unit receptance function etc. does not change.It will be seen that the image I ultimately generated is the superposition of two pictures:
One of them as Img (α r, f (fp, fo, d)) be light component be α r by equivalent focal length be f (fp, fo, d) equivalent lens it is poly-
Collect formed focus image, namely modulated by the equivalent lens by described polarization 14 groups of formation of optical lens 122 and the lens
Focus image formed by light component；Another is then institute of the light component for (1- α) r by focal length for fo as Img ((1- α) r, fo)
Out-of-focus image formed by non-polarized light lens group 14 is stated, namely formed by the light component modulated by the non-polarized light lens group 14
Out-of-focus image.When α<0.5, α get over hour or α>0.5, when α is bigger, the ratio gap of two images is more greatly different.Particularly, work as α
=cos (θ)=0, i.e. θ be 90 degree, that is, be incident to it is described polarization optical lens 122 polarised light polarization direction and the polarised light
When angle between the polarization direction of lens 122 is 90 degree, I=Img (r, fo).As α=cos (θ)=1, i.e. θ is 0 degree, that is, is entered
When the angle penetrated between the polarization direction of light and the polarization direction of the polarization optical lens 122 is 0 degree, I=Img (r, f (fp,
Fo, d)).
It follows that final imaging is no longer the superposition of different focal length light imaging, but all i.e. when α=0 or 1
Light component corresponds to image formed by same focal length f (fp, fo, d) or fo.
Each automatically controlled polarised light rotary device 121 can rotate a fixed angle to incident polarized light and not revolve
Turn (the i.e. described automatically controlled polarised light rotary device 21 make to be incident to the polarised light thereon polarization direction rotation angle 0
Degree) switch under two states.Assuming that the polarization direction of the light before entering the automatically controlled polarised light rotary device 121 with it is described
Angle is θ between the polarization direction for the polarised light that polarization optical lens 122 can play modulating action, the automatically controlled polarised light rotary device
121 can make to be incident to the polarization direction rotation angle γ of the polarised light thereon.Automatically controlled 121 energy of polarised light rotary device
Angle by the polarization direction rotation for being incident to polarised light thereon be 0 degree (we are set as state t1) and rotates angle to be γ
Switch under two states of (we are set as state t2).
When the automatically controlled polarised light rotary device 21 makes to be incident to the angle of the polarization direction rotation of the polarised light thereon
Degree is 0 degree, i.e., when the described automatically controlled polarised light rotary device 121 does not change the polarization direction for being incident to polarised light thereon,
I.e. in state t1, on described image acquisition unit 15 finally at image be expressed as formula:
I1=Img (cos (θ) r, f (fp, fo, d))+Img ((1-cos (θ)) r, fo)
When the polarization direction for being incident to polarised light thereon is rotated angle by the automatically controlled polarised light rotary device 121
When γ, i.e., in state t2, on described image acquisition unit finally at image be expressed as formula:
I2=Img (cos (θ+γ) r, f (fp, fo, d))+Img ((1-cos (θ+γ)) r, fo).
In other words, it be α 1r by equivalent focal length is the equivalent of f (fp, fo, d) that gained, which seems light component, under t1 state
It is formed by the non-polarized light lens group 14 of fo by focal length that mirror, which assembles formed focus image and light component for (1- α 1) r,
The superposition of out-of-focus image, it is the equivalent lens that α 2r is f (fp, fo, d) by equivalent focal length that gained, which seems light component, under t2 state
Assembling formed focus image and light component for (1- α 2) r is to dissipate formed by the non-polarized light lens group 14 of fo by focal length
The superposition of burnt image.
The polarization direction of polarised light before being incident on the automatically controlled polarised light rotary device 121 and the polarised light are saturating
When angle theta is 0 between the polarization direction for the polarised light that mirror 122 can play modulating action, and the automatically controlled polarised light rotary device
When the 121 rotation angle γs for rotating above-mentioned polarised light are 90 degree, in other words, in state t1, the automatically controlled polarised light rotation
Turn device 121 and have not been changed the polarization direction for being incident to polarised light thereon, that is, is incident to the inclined of the polarization optical lens 122
Angle between the polarization direction for the polarised light that the polarization direction of vibration light and the polarization optical lens 122 can play modulating action is 0
Degree, and in state t2, the automatically controlled polarised light rotary device 121 revolves the polarization direction for being incident to polarised light thereon
90 degree of gyration, that is, the polarization direction and the polarization optical lens 122 for being incident to the polarised light of the polarization optical lens 122 can rise
When angle between the polarization direction of the polarised light of modulating action is 90 degree or 270 degree,
I1=Img (r, f (fp, fo, d)), I2=Img (r, fo)
The polarization direction of polarised light before being incident on the automatically controlled polarised light rotary device 121 and the polarised light are saturating
When angle theta is 90 between the polarization direction for the polarised light that mirror 122 can play modulating action, and the automatically controlled polarised light rotary device
When the 121 rotation angle γs for rotating above-mentioned polarised light are 90 degree, in other words, in state t1, the automatically controlled polarised light rotation
Turn device 121 and have not been changed the polarization direction for being incident to polarised light thereon, that is, is incident to the inclined of the polarization optical lens 122
Angle between the polarization direction for the polarised light that the polarization direction of vibration light and the polarization optical lens 122 can play modulating action is 90
Degree, and in state t2, the automatically controlled polarised light rotary device 121 revolves the polarization direction for being incident to polarised light thereon
90 degree of gyration, that is, the polarization direction and the polarization optical lens 122 for being incident to the polarised light of the polarization optical lens 122 can rise
When angle between the polarization direction of the polarised light of modulating action is 0 degree,
I1=Img (r, fo), I2=Img (r, f (fp, fo, d))
That is, our the resulting images under t1 and t2 state are that all light components correspond to focal length to be respectively f
Image formed by (fp, fo, d) and fo or fo and f (fp, fo, d).
Fig. 4 is the structural schematic diagram for the imaging device 200 that second embodiment of the invention provides.The imaging device 200
Structure and the imaging device 100 are essentially identical comprising: polarised light generating device 21, an optical units 22, driving circuit
23, non-polarized light lens group 24 and image acquisition units 25；The difference is that: the optical unit 22 includes multiple automatically controlled
Polarised light rotary device 221 and multiple polarization optical lens 222.In the present embodiment, the multiple automatically controlled polarization optical rotator
Part 221 arranges in a row, is uniformly arranged between the polarised light generating device 21 and the multiple polarization optical lens 222.
The multiple polarization optical lens 222 in a row, is uniformly arranged on the multiple automatically controlled polarised light rotary device 221 and institute side by side
It states between non-polarized light lens group 24.Wherein, each automatically controlled polarised light rotary device 221 will be incident to the inclined of polarised light thereon
The angle that vibration direction rotates is not identical.
It is understood that in the present embodiment, the quantity of the automatically controlled polarised light rotary device 221 is one or two
It is a, and the quantity of the polarization optical lens 222 is multiple；Or the quantity of the polarization optical lens 222 is one or two,
And the quantity of the automatically controlled polarised light rotary device 221 is multiple.
Specifically, the working principle that the imaging device 200 is imaged is as follows:
The multiple automatically controlled polarised light rotary device 221 can will be incident to polarised light thereon in different polarization angle shape
It is switched fast under state.When automatically controlled 221 quantity of polarised light rotary device reaches certain value, the multiple automatically controlled polarised light rotation
Turn device 221 and may range from 0 according to the polarization angle that the driving signal that the driving circuit 23 provides changes the polarised light
To 360 degree.It follows that can control some automatically controlled polarised light according to demand optionally through the driving signal and rotate
Device 221, so that the polarization angle for making to be incident to polarised light thereon is rotated to scheduled polarization angle.Due to the multiple electricity
The polarised light for being incident to thereon can be switched fast by control polarised light rotary device 221 under different polarization angle state, thus
We quickly can obtain the imagings of different focused conditions in different moments respectively.
Specifically, the process that the imaging device 200 is imaged is as follows:
Assuming that automatically controlled 221 quantity of polarised light rotary device is n (n >=1), 222 quantity of polarization optical lens is m
(m >=1).Assuming that the angle that i-th of automatically controlled polarised light rotary device 221 rotates is γ i degree, the polarised light generating device 21
Generating angle between the polarization direction of polarised light and the polarization direction of j-th of polarization optical lens 222 is θ j, and j-th of polarised light is saturating
The focal length of mirror 222 is fj, and+1 away from jth polarization optical lens 222 of j-th of polarization optical lens 222 (is non-inclined as j=m herein
Shake optical lens group) distance be dj.Since any one automatically controlled polarised light rotary device 221i can make to be incident to thereon inclined
The polarization direction of vibration light rotates to be switched under 0 degree of two state of non-zero angle and rotation, thus theoretically we can obtain altogether 2n
A polarized light state, we indicate that kth (is greater than and is less than or equal to 2 equal to 1 with CknInteger) a polarized light state rotated
Angle, we are 2nA different moments can obtain 2 respectivelynThe image generated under a difference focused condition, any one is equal as Ik
2 can be regarded asmThe superposition of a picture, each is as being a certain light component by image formed by an equivalent focal length fk.Work as m
When=1, Ik can be regarded as the superposition of 2 pictures,
Ik=Img (cos (θ 1+Ck) r, f (f1, fo, d1))+Img ((1-cos (θ 1+Ck)) r, f (fo))；
As m=2, Ik can be regarded as the superposition of 4 pictures,
Ii=Img (cos (θ 1) cos (θ 2) r, f (f1, f2, fo, d1, d2))+Img ((1-cos (θ 1)) cos (θ 2) r, f
(f2, fo, d2))+Img (cos (θ 1) (1-cos (θ 2)) r, f (f1, fo, d1+d2))+Img ((1-cos (θ 1)) (1-cos (θ
2)) r, f (fo))
And so on, final each image Ik can regard 2 asmThe superposition of the image of a corresponding different focal length.
Fig. 5 is the structural schematic diagram for the imaging device 300 that third embodiment of the invention provides.The imaging device 300
Structure and the imaging device 100 are essentially identical comprising: polarised light generating device 31, optical unit 32, driving circuit 33,
Non-polarized light lens group 34 and image acquisition units 35；The difference is that: the imaging device 300 includes multiple optics lists
Member 32.In the present embodiment, the imaging device 300 includes three optical units 32, and each optical unit 32 includes one
Automatically controlled polarised light rotary device 321 and a polarization optical lens 322, and the automatically controlled polarization optical rotator of each optical unit 32
The polarization optical lens 322 of 321 face adjacent optical unit 32 of part.Three groups of arrangements of optical unit 32 in a row, are arranged described
Between polarised light generating device 31 and the non-polarized light lens group 34.In other words, the automatically controlled polarised light rotary device 321
It is arranged at intervals between the polarised light generating device 31 and the non-polarized light lens group 34 with the polarization optical lens 322.
It is understood that the imaging device 300 also may include the light of two optical units 32 or three or more
Learn unit 32.Wherein, each automatically controlled polarised light rotary device 321 will be incident to the angle of the polarization direction rotation of polarised light thereon
It spends not identical.
Specifically, the process that the imaging device 300 is imaged is as follows:
Assuming that the quantity of the automatically controlled polarised light rotary device 321 is n1, the quantity of the polarization optical lens 322 is m1.
Image-forming principle and process at this time is consistent with the image-forming principle for the imaging device 100 that first embodiment provides and process.Tool
Body, we can make to be incident to the inclined of the polarised light thereon by controlling each automatically controlled polarised light rotary device 321
Two states of 0 degree of angle or non-zero degree that vibration direction rotates, so that polarised light at this time can form 2 in totaln1A state,
Formed image is 2 under each statem1The superposition of a picture.And then secondary one or several automatically controlled polarization optical rotators of discharge
Part 321 and one or several polarization optical lens 322, if the quantity of the automatically controlled polarised light rotary device 321 of this moment addition
For n2, the quantity for polarizing optical lens 322 is m2, then the polarized light state that we can generate at this time is 2n1+n2, under each state
The image of generation is 2m1+m2The superposition of a picture.And so on, it is assumed that finally sharing all automatically controlled polarised light rotary device quantity is
N, all polarised light lens numbers are m, and the final imaging system has 2nA image formation state, the image under each state is 2mIt is a
The superposition of picture.
Fig. 6 is the structural schematic diagram for the imaging device 400 that fourth embodiment of the invention provides.The imaging device 400
Structure and the imaging device 300 are essentially identical comprising: polarised light generating device 41, multiple optical units 42, driving circuit
43, non-polarized light lens group 44 and image acquisition units 45；The difference is that: one of optical unit 42 includes multiple
Automatically controlled polarised light rotary device 421 and multiple polarization optical lens 422, and the automatically controlled polarization optical rotator of each optical unit 42
The polarization optical lens 422 of 421 face adjacent optical unit 42 of part.Specifically, in the present embodiment, the imaging device 400 wraps
Three optical units 42 are included, and it includes multiple automatically controlled polarised light rotary devices 421 and more that intermediate optical unit 42, which is arranged in,
A polarization optical lens 422.Wherein, each automatically controlled polarised light rotary device 421 will be incident to the polarization direction of polarised light thereon
The angle of rotation is not identical.
It is understood that the imaging device 400 also may include two or more optical units 42, also, its
In optical unit 42 include multiple automatically controlled polarised light rotary devices 421 and/or multiple polarization optical lens 422.
It can be seen from the above, the imaging of the image-forming principle of the imaging device 400 and imaging process and the imaging device 300
Principle is essentially identical with imaging process, and details are not described herein.
Fig. 7 is the structural schematic diagram for the imaging device 500 that fifth embodiment of the invention provides.The imaging device 500
Structure and the imaging device 300 are essentially identical comprising: polarised light generating device 51, multiple optical units 52, driving circuit
53, non-polarized light lens group 54 and image acquisition units 55；The difference is that: at least two optical units 52 include multiple
Automatically controlled polarised light rotary device 521 and/or multiple polarization optical lens 522, and the automatically controlled polarised light rotation of each optical unit 52
The polarization optical lens 522 of 521 face adjacent optical unit 52 of device.Wherein, each automatically controlled polarised light rotary device 521 will be incident
The angle rotated to the polarization direction of polarised light thereon is not identical.
In the present embodiment, the imaging device 500 includes multiple optical units 52, and each optical unit 52 includes multiple
Automatically controlled polarised light rotary device 521 and multiple polarization optical lens 522.It is understood that in other embodiments, each optics
Unit 52 can also only include multiple automatically controlled polarised light rotary devices 521 or multiple polarization optical lens 522；Or only wherein two
A optical unit 52 includes multiple automatically controlled polarised light rotary devices 521 and/or multiple polarization optical lens 522.
It can be seen from the above, the imaging of the image-forming principle of the imaging device 500 and imaging process and the imaging device 300
Principle is essentially identical with imaging process, and details are not described herein.
Fig. 8 is the flow diagram for the imaging method 600 that sixth embodiment of the invention provides, and may include following step
It is rapid:
Step 601: incident ray is converted into the polarised light with single polarization direction.In the present embodiment, by inclined
Vibration photogenerated device is converted to the polarised light of a certain polarization direction, generally, the polarization photoproduction by light thereon is incident to
It can be polarizing film at device.
Step 602: rotating the polarization direction of the polarised light to predetermined direction by automatically controlled polarised light rotary device.?
In the present embodiment, the polarization direction of the polarised light is rotated to predetermined direction by twisted nematic liquid crystal box.Due to each electricity
Control polarised light rotary device can rotate a non-zero fixed angle and rotation to the polarization direction for being incident to polarised light thereon
Turn to switch under 0 degree of two states, therefore, when the quantity of the automatically controlled polarised light rotary device reaches certain value, Ke Yigen
According to demand, one of them described automatically controlled polarised light rotary device is selectively controlled, to make the angle of polarization of incident polarised light
Spending range is any one angle in 0 to 360 degree.
Step 603: at the first moment, when the automatically controlled polarised light rotary device rotates the polarization direction of the polarised light
Angle be 0 degree when, acquisition by the automatically controlled polarised light rotary device, polarization optical lens and non-polarized light lens group light
The optical signal is converted into electric signal and generates the first image by signal.In the present embodiment, by image acquisition units by light
Signal is converted into the sensor of electric signal and production figures image, such as CCD or cmos image sensor.
Specifically, when the automatically controlled polarised light rotary device rotate the polarization direction of the polarised light 0 degree of angle
When, on described image acquisition unit finally at image be expressed as formula:
I1=Img (cos (θ) r, f (fp, fo, d))+Img ((1-cos (θ)) r, fo)
Wherein, θ indicates the polarization direction for being incident to the polarised light of the automatically controlled polarised light rotary device and the polarised light
Angle between the polarization direction of the corresponding polarised light of lens, f (fp, fo, d) state the polarization optical lens with it is described unpolarized
The equivalent focal length of optical lens group, fp are the focal length of the polarization optical lens, and fo is the focal length of the non-polarized light lens group, and d is
The principal point of the polarization optical lens and the distance between the principal point of the non-polarized light lens group.
Step 604: at the second moment, when the automatically controlled polarised light rotary device rotates the polarization direction of the polarised light
Angle be non-zero when spending, acquisition is by the automatically controlled polarised light rotary device, polarization optical lens and non-polarized light lens group
The optical signal is converted into electric signal and generates the second image by optical signal.
Specifically, as the angle γ that the automatically controlled polarised light rotary device rotates the polarization direction of the polarised light
When, on described image acquisition unit finally at image be expressed as formula:
I2=Img (cos (θ+γ) r, f (fp, fo, d))+Img ((1-cos (θ+γ)) r, fo).
Step 605: by handling the first image and second image, to obtain final image.
Since the automatically controlled polarised light rotary device can rapidly change into the polarization direction of polarised light thereon, and can
Can rapidly change focal length by the polarization optical lens, so as to quickly generate the figure under continuous different focused conditions
Picture.Image under the continuous different focused conditions, can pass through DFF (Depth-from-Focus) or DFD (Depth-
From-Defocus method) carries out the depth measurement etc. of scene.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (15)
1. a kind of imaging device characterized by comprising
Polarised light generating device, for incident ray to be converted to the polarised light with single polarization direction；
At least one optical unit, at least one described optical unit include at least one automatically controlled polarised light rotary device and extremely
A few polarization optical lens, the polarised light be successively incident to described at least one automatically controlled polarised light rotary device and it is described extremely
A few polarization optical lens；
Driving circuit is connected at least one described automatically controlled polarised light rotary device, at least one described automatically controlled polarised light rotation
Device changes the polarization direction of the polarised light according to the driving signal that driving circuit provides；
Non-polarized light lens group, the polarised light are incident to the non-polarized light lens after at least one described optical unit
Group；And
Image acquisition units modulate via the automatically controlled polarised light rotary device for acquiring and pass through the non-polarized light lens
Group polarised light and generate image；
When the automatically controlled polarised light rotary device rotate the polarization direction of the polarised light 0 degree of angle, described image
The image generated on acquisition unit is the equivalent lens tune formed by the polarization optical lens and the non-polarized light lens group
Out-of-focus image formed by focus image formed by the light component of system and the light component modulated by the non-polarized light lens group
Synthesis.
2. imaging device according to claim 1, which is characterized in that at least one described automatically controlled polarised light rotary device is
Twisted nematic liquid crystal box.
3. imaging device according to claim 1, which is characterized in that at least one described polarization optical lens is to use liquid crystal
The lens of material production.
4. imaging device according to claim 1, which is characterized in that when the imaging device include an optical unit,
The optical unit includes an automatically controlled polarised light rotary device and a polarization optical lens, and when the automatically controlled polarised light rotation
When turning 0 degree of angle that device rotates the polarization direction of the polarised light, on described image acquisition unit finally at image
It is expressed as formula:
I1=Img ((cos (θ)) r, f (fp,fo,d))+Img((1-cos(θ))r,fo)
Wherein, Img (r, f) is an image function, represents light component as r, corresponding focal length be f can at picture, θ expression incidence
To the polarization of the polarization direction of the polarised light of automatically controlled polarised light rotary device polarised light corresponding with the polarization optical lens
Angle between direction, the equivalent focal length of f (fp, fo, d) the statement polarization optical lens and the non-polarized light lens group, fp
For it is described polarization optical lens focal length, fo be the non-polarized light lens group focal length, d be it is described polarization optical lens principal point with
The distance between the principal point of the non-polarized light lens group.
5. imaging device according to claim 4, which is characterized in that when the automatically controlled polarised light rotary device by it is described enter
When the polarization direction rotation angle for being incident upon polarised light thereon is γ, on described image acquisition unit finally at image be expressed as
Following formula:
I2=Img ((cos (θ+γ)) r, f (fp,fo,d))+Img((1-cos(θ+γ))r,fo)。
6. imaging device according to claim 1, which is characterized in that the imaging device includes the multiple light being arranged successively
Unit is learned, each optical unit includes at least one automatically controlled polarised light rotary device and at least one polarizes optical lens, each
The polarization optical lens of the automatically controlled polarised light rotary device face adjacent optical unit of optical unit.
7. imaging device according to claim 1, which is characterized in that the imaging device includes the multiple light being arranged successively
Unit is learned, each optical unit includes an automatically controlled polarised light rotary device and a polarization optical lens, each optical unit
Automatically controlled polarised light rotary device face adjacent optical unit polarization optical lens.
8. a kind of imaging device characterized by comprising
Polarised light generating device, for incident ray to be converted to the polarised light with single polarization direction；
At least one optical unit, at least one described optical unit include multiple automatically controlled polarised light rotary devices and it is multiple partially
Shake optical lens, and the polarised light is successively incident to the multiple automatically controlled polarised light rotary device and the multiple polarised light is saturating
Mirror；
Driving circuit, is connected to the multiple automatically controlled polarised light rotary device, the multiple automatically controlled polarised light rotary device according to
The driving signal that driving circuit provides changes the polarization direction of the polarised light；
Non-polarized light lens group, the polarised light are incident to the non-polarized light lens after at least one described optical unit
Group；And
Image acquisition units modulate via the automatically controlled polarised light rotary device for acquiring and pass through the non-polarized light lens
Group polarised light and generate image；
The angle that each automatically controlled polarised light rotary device will be incident to the polarization direction rotation of polarised light thereon is not identical.
9. imaging device according to claim 8, which is characterized in that the multiple automatically controlled polarised light rotary device is according to drive
The driving signal that dynamic circuit provides changes the angular range for being incident to the polarization direction of polarised light thereon are as follows: 0 degree to 360 degree.
10. a kind of imaging device characterized by comprising
Polarised light generating device, for incident ray to be converted to the polarised light with single polarization direction；
Multiple optical units, the multiple optical unit include that multiple automatically controlled polarised light rotary devices and multiple polarised lights are saturating
Mirror, the polarised light are successively incident to the multiple automatically controlled polarised light rotary device and the multiple polarization optical lens；
Driving circuit, is connected to the multiple automatically controlled polarised light rotary device, the multiple automatically controlled polarised light rotary device according to
The driving signal that driving circuit provides changes the polarization direction of the polarised light；
Non-polarized light lens group, the polarised light are incident to the non-polarized light lens group after the multiple optical unit；
And
Image acquisition units modulate via the automatically controlled polarised light rotary device for acquiring and pass through the non-polarized light lens
Group polarised light and generate image；
The imaging device includes the multiple optical units being arranged successively, and multiple optical units include multiple automatically controlled polarised light rotations
Device and multiple polarization optical lens, the polarization of the automatically controlled polarised light rotary device face adjacent optical unit of each optical unit
Optical lens.
11. a kind of imaging device characterized by comprising
Polarised light generating device, for incident ray to be converted to the polarised light with single polarization direction；
Multiple optical units, the multiple optical unit include that multiple automatically controlled polarised light rotary devices and multiple polarised lights are saturating
Mirror, the polarised light are successively incident to the multiple automatically controlled polarised light rotary device and the multiple polarization optical lens；
Driving circuit, is connected to the multiple automatically controlled polarised light rotary device, the multiple automatically controlled polarised light rotary device according to
The driving signal that driving circuit provides changes the polarization direction of the polarised light；
Non-polarized light lens group, the polarised light are incident to the non-polarized light lens group after the multiple optical unit；
And
Image acquisition units modulate via the automatically controlled polarised light rotary device for acquiring and pass through the non-polarized light lens
Group polarised light and generate image；
The imaging device includes the multiple optical units being arranged successively, and the automatically controlled polarised light rotary device of each optical unit is just
To the polarization optical lens of adjacent optical unit, each optical unit includes multiple automatically controlled polarised light rotary devices and multiple polarizations
Optical lens, the polarization optical lens of the automatically controlled polarised light rotary device face adjacent optical unit of each optical unit.
12. a kind of imaging method characterized by comprising
Incident ray is converted into the polarised light with single polarization direction；
The polarization direction of the polarised light is rotated to predetermined direction by automatically controlled polarised light rotary device；
At the first moment, when the automatically controlled polarised light rotary device rotate the polarization direction of the polarised light 0 degree of angle
When, acquisition, will be described by the optical signal of the automatically controlled polarised light rotary device, polarization optical lens and non-polarized light lens group
Optical signal is converted into electric signal and generates the first image；
At the second moment, when the angle that the automatically controlled polarised light rotary device rotates the polarization direction of the polarised light is non-zero
When spending, the optical signal of the automatically controlled polarised light rotary device, polarization optical lens and non-polarized light lens group is passed through in acquisition, by institute
Optical signal is stated to be converted into electric signal and generate the second image；And
By handling the first image and second image, to obtain final image.
13. imaging method according to claim 12, which is characterized in that described in making when the automatically controlled polarised light rotary device
When the angle of the polarization direction rotation of polarised light is 0 degree, on described image acquisition unit finally at image be expressed as public affairs
Formula:
I1=Img ((cos (θ)) r, f (fp,fo,d))+Img((1-cos(θ))r,fo)
Wherein, Img (r, f) is an image function, represents light component as r, corresponding focal length be f can at picture, θ expression incidence
To the polarization of the polarization direction of the polarised light of automatically controlled polarised light rotary device polarised light corresponding with the polarization optical lens
Angle between direction, the equivalent focal length of f (fp, fo, d) the statement polarization optical lens and the non-polarized light lens group, fp
For it is described polarization optical lens focal length, fo be the non-polarized light lens group focal length, d be it is described polarization optical lens principal point with
The distance between the principal point of the non-polarized light lens group.
14. imaging method according to claim 13, which is characterized in that described in making when the automatically controlled polarised light rotary device
When the angle of the polarization direction rotation of polarised light is γ, on described image acquisition unit finally at image be expressed as public affairs
Formula:
I2=Img ((cos (θ+γ)) r, f (fp,fo,d))+Img((1-cos(θ+γ))r,fo)。
15. imaging method according to claim 12, which is characterized in that when automatically controlled polarised light rotary device is multiple,
The angle that each automatically controlled polarised light rotary device will be incident to the polarization direction rotation of polarised light thereon is not identical, selectively
One of them automatically controlled polarised light rotary device is controlled, to make to be incident to polarization thereon by the automatically controlled polarised light rotary device
The polarization direction of light is rotated to predetermined direction.
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| CN105785580B (en) * | 2016-04-15 | 2018-02-16 | 中国科学院上海技术物理研究所 | A kind of constant linearly polarized light generation device of controllable light intensity in polarization direction |
| CN106231177A (en) * | 2016-07-20 | 2016-12-14 | 成都微晶景泰科技有限公司 | Scene depth measuring method, equipment and imaging device |
| CN106725336B (en) * | 2017-01-05 | 2023-10-10 | 北京响臻科技有限公司 | Portable skin photographing device based on cross polarization |
| CN111176049B (en) * | 2018-11-13 | 2021-12-24 | 电子科技大学 | Liquid crystal optical device, imaging apparatus and imaging method |
| CN110208999B (en) * | 2019-05-18 | 2023-03-24 | 深圳市麓邦技术有限公司 | Image acquisition method and system |
| CN110221456B (en) * | 2019-06-06 | 2022-01-18 | 京东方科技集团股份有限公司 | Polarization imaging device and method thereof |
| CN112051675B (en) * | 2020-09-27 | 2022-11-25 | 京东方科技集团股份有限公司 | Near-to-eye display device |
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