CN104714354A - Diaphragm structure and image processing method thereof - Google Patents
Diaphragm structure and image processing method thereof Download PDFInfo
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- CN104714354A CN104714354A CN201410604623.XA CN201410604623A CN104714354A CN 104714354 A CN104714354 A CN 104714354A CN 201410604623 A CN201410604623 A CN 201410604623A CN 104714354 A CN104714354 A CN 104714354A
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
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Abstract
The invention provides a diaphragm structure. At least one through hole of the diaphragm structure is a crescent-shaped through hole. Lenses with the diaphragm structures are used in pairs, and the two crescent-shaped through holes face reversely, and obtain two images respectively. The same point in the two images and a window nearby the point are selected, and Fourier transformations of the two images are calculated; each d value within a selectable distance range according to needs is used for successively calculating a set of frequency domain recovery values and a set of frequency domain error evaluation values of the point; the d value corresponding to the minimum frequency domain error evaluation value is selected as the optimal estimated distance value of the point, and the corresponding frequency domain recovery value serves as the optimal frequency domain recovery value of the point; inverse Fourier transformation is performed on the optimal frequency domain recovery value, so that a clear image value of a space domain is obtained. Through transforming the shape of the through holes of the diaphragm structure, a pair of special diaphragms and the corresponding image processing method are used for performing inverse recovery calculation, so that the distance between sceneries is accurately obtained, the image which is clear at a short distance or an intermediate distance or a long distance is obtained, and the purpose of greatly increasing the field depth is achieved.
Description
Technical field
The invention belongs to optical imagery and image processing field, be specifically related to a kind of iris diaphragm structure and image processing method thereof.
Background technology
Current digital camera or Digital Video generally comprise stationary lens and imageing sensor and graphics processing unit.Lens or lens combination is comprised inside camera lens, and iris diaphragm structure.The topmost ingredient of iris diaphragm structure is the perforate of ad-hoc location in camera lens, and majority was circular or the sub-circular of multi-disc catch formation in the past.In the past, the Main Function of aperture be used to control light enter camera lens number.When bright light, overexposure can be avoided with little aperture; When dim light, brightness of image can be improved with large aperture.Coordinate the length of time shutter simultaneously, jointly reach brightness of image suitable.In addition, according to imaging theory, the size of aperture can affect the depth of field, is exactly can the distance range of imaging clearly in scenery.In general, the field depth that little aperture is corresponding is large, and the field depth that large aperture is corresponding is little.
Small-sized image pickup module, is widely used for monitoring, mobile phone, mobile device etc.At the camera lens that these fields use, be all generally fixed size aperture, its shape is all polygon that is circular or sub-circular.Medium-to-high grade camera module, has auto-focus function, according to needs when shooting, focuses on certain subject distance, in its field depth, can reach clear picture.But exceed the scenery object of its field depth, such as close shot or distant view, just can not focus on well, these image-regions are just clear not.Low and middle-grade camera modules, does not have auto-focus function, is set to certain focusing distance when dispatching from the factory.In use, if scenery is not in its suitable field depth, image is just very fuzzy.No matter being self-focusing camera module, or the camera lens of fixed focal length, when taking, all cannot reaching near simultaneously, in, scenery far away is simultaneously clear.In addition, current imaging scheme, accurately cannot obtain the range information of each object in scenery to video camera all at all.
Introduce the basis of optical imagery below, and explain the limitation of classic method in extraction of depth information.
For general conventional camera lens imaging system, can show with following formula table:
Wherein, f is the image that this imaging system obtains, f
0it is potential Utopian, the image that should obtain when focusing on accurate, η is the noise of this imaging system, k is the point spread function of this lens system, its function shape characteristic determined by iris shape and lens systems, the wherein size of this point spread function of behalf k, point spread function k and object are closely related to the distance of camera lens, also can be referred to as ambiguity function out of focus.
what represent is convolution operation.Simply, when object is in present convergence clear position time, the size of s can be very little, and the effect of k (s) is very little, and imaging should be clearly, and realistic meaning is that image f is equal to ideal image f substantially
0; When object is in non-focusing position time, the size of s will become large, and the effect of k (s) will be that a low-pass filter is applied to should clearly on image, and the image obtained is exactly fuzzy.
From the rudimentary knowledge of optical system, we know, the style characteristic of point spread function k determined by iris shape.General common aperture is circular, or the polygon of symmetry, as the form of the sub-circular such as hexagon, octagon.Their point spread function k is then almost symmetry, is similar to a gauss low frequency filter.Can learn from knowwhy, when object is positioned at focal position time, k (s) is very little.When object is not positioned at focal position time, point spread function size will become large.Size due to the distance d between scenery and camera lens and k (s) has basic relation one to one, there is a kind of method in the past, expect by analysis chart as f, attempt the estimated value by calculating the size obtaining s, then obtain the distance d between scenery and camera lens.But the method has serious birth defect, shown by this example, if only from the words of the graphical analysis photographed, when certain region in image be in out of focus fuzzy time, namely allow to roughly estimate possible point spread function k (s), because distance or the point spread function size that closely causes are all become large, k (s) both them is substantially identical, therefore cannot to judge exactly this result be due to this scenery distance closely or far away to cause.This problem is called the uncertainty that subject distance is estimated, this is the essential defect of previous methods.
Summary of the invention
The technical problem to be solved in the present invention is: provide a kind of iris diaphragm structure and image processing method thereof, and with camera lens, the camera of this aperture, can obtain the image of total focus, and obtain range information, be i.e. the range information of scenery and camera lens.
The present invention for solving the problems of the technologies described above taked technical scheme is: a kind of iris diaphragm structure, comprising the through hole for allowing light enter camera lens, it is characterized in that: described through hole has at least a form to be crescent through hole.
By said aperture structure, described crescent through hole is made up of external arc and Inner arc, the two ends of external arc and Inner arc connect into intersection point respectively, allowing by the part of light is crescent, the center of circle of the external arc described in definition to the vector in the center of circle of Inner arc be through hole towards, wherein the diameter of external arc is the diameter of the maximum ring size of camera lens, and the diameter of Inner arc is 0.4-0.8 times of external arc diameter.
Preferably, described through hole is 2 and in same plane, 2 crescent through holes towards along mid point Central Symmetry therebetween.The position of through hole can up and down, left and right or oblique placement, only need towards relatively, namely along mid point Central Symmetry therebetween.During use, two camera lenses are placed in left and right side by side, respective internal arrangement crescent aperture through hole, form twin-lens system.2 described crescent aperture through holes towards relatively, namely along mid point Central Symmetry therebetween.The putting position of two camera lenses also can be put up and down, but 2 of inside aperture through holes towards, still will along mid point Central Symmetry therebetween.
Another is preferred, and single-lens system, iris diaphragm structure is wherein iris ring.This aperture can in use change its shape of through holes, and basic configuration is above-mentioned crescent shape, towards changing.Before and after obtaining when two width images, the crescent through hole described in using separately towards relatively, namely 2 kinds towards the center of circle Central Symmetry along external arc.
A kind of camera lens, is characterized in that: it includes the iris diaphragm structure described in above-mentioned any one.
A kind of camera, is characterized in that: it includes above-mentioned camera lens.
A kind of camera, it is characterized in that: it comprises about 2 camera lenses placed side by side, or the camera lens of placement side by side up and down, through hole in the iris diaphragm structure of wherein each camera lens is crescent, crescent through hole is made up of external arc and Inner arc, the two ends of external arc and Inner arc connect into intersection point respectively, allowing by the part of light is crescent, the center of circle of the external arc described in definition to the vector in the center of circle of Inner arc be through hole towards, through hole be oriented from the horizontal by 45 °, aperture through hole in two camera lenses is towards relatively, namely along mid point Central Symmetry therebetween.
A kind of image processing method, is characterized in that: it comprises following steps:
S1, obtain 2 width images respectively:
2 width images are all taken by the camera of said aperture structure, and the through hole obtaining iris diaphragm structure during 2 width image is crescent through hole, crescent through hole towards the center of circle Central Symmetry along external arc, crescent through hole is made up of external arc and Inner arc, the two ends of external arc and Inner arc connect into intersection point respectively, the center of circle of the external arc described in definition to the vector in the center of circle of Inner arc be through hole towards; The visual angle of camera during 2 width image taking, optical axis are towards unanimously, and optical imaging system is identical;
S2, the phase same point of getting in 2 width images, and the pixel window of some near this point, calculate the Fourier transform of respective pixel window;
S3, by the d value in each as required optional distance range, at frequency domain, successively calculate the frequency restoration value of one group of this point, the error of frequency domain evaluation of estimate of one group of this point, corresponding with d value; D is the distance between scenery and camera lens, determines span according to actual needs;
S4, choose the best-estimated distance value of d value corresponding to minimum error of frequency domain evaluation of estimate as this point, corresponding frequency restoration value is as the frequency domain optimal recovery value of this point;
S5, inverse-Fourier transform is carried out to the frequency domain optimal recovery value of this point, obtain the picture rich in detail value of the spatial domain of this point.
As stated above, also comprise S6, scan in 2 width images and need each point to be processed one by one, obtain the picture rich in detail value of the spatial domain of each point, finally obtain the whole picture rich in detail needing processing section spatial domain in image.
Preferably, described S1 takes the iris diaphragm structure that 2 width images use, being oriented from the horizontal by 45 ° of one of them through hole.
Beneficial effect of the present invention is:
1, by having transformed the shape of aperture through hole, though do not change image-forming principle, but its imaging effect and the effect of circular iris have inherent different characteristic; Although the original image obtained directly seems to seem fuzzyyer, but according to optical system transfer principle by analysis, utilize that image processing method corresponding to this special aperture is counter recovers computing, finally can acquire image more clearly, can obtain nearly medium and long distance can both image clearly, reach the object of greatly extended depth-of-field, and obtain the range information of the object distance camera lens in scenery simultaneously.
2, by test and reasoning, the aperture of crescent through hole needs to use in pairs, and needing relatively towards position of two crescent through holes, being oriented from the horizontal by effect when 45 ° of through hole is better, such as one of them towards upper left 45 °, another towards bottom right 45 °; Or the placement direction of upper right and lower-left.
3, based on thought of the present invention, only need slightly to make an amendment on former aperture, and the partial software revised in fuselage can achieve the goal, compatible strong with original system.
Accompanying drawing explanation
Fig. 1 is the iris diaphragm structure schematic diagram of one embodiment of the invention.
Fig. 2 is the imaging system schematic diagram of one embodiment of the invention.
Fig. 3 is the acquisition schematic diagram of the best-estimated distance value of one embodiment of the invention.
Fig. 4 is the image processing method process flow diagram of one embodiment of the invention.
Embodiment
Below in conjunction with instantiation, the present invention will be further described.
A kind of iris diaphragm structure, comprise the through hole for allowing light enter camera lens, described through hole has at least a form to be crescent through hole.As shown in Figure 1, crescent through hole is made up of external arc and Inner arc, the two ends of external arc and Inner arc connect into intersection point respectively, and wherein the diameter of external arc is the diameter of the maximum ring size of camera lens, and the diameter of Inner arc is that the 0.4-0.8 of external arc diameter doubly (is preferably 0.6 times).
Be defined as by through hole to have has at least a form to be crescent through hole herein, instead of directly through hole is limited and can only be for the object of crescent through hole: the through hole of iris diaphragm structure can be variform, be generally polygon that is circular or sub-circular, can also according to shooting needs, the form of adjustment through hole, (time such as in camera applications, selecting total focus pattern) when needing image or the acquisition range information obtaining total focus, making through hole be crescent through hole.Concrete operations can be the iris diaphragm structures that (1) changes a crescent through hole; (2) pre-set what a shelter, have and the circle of Inner arc equal diameters or sector structure, when needs use crescent through hole, the polygonal through hole of circular or sub-circular moves into this shelter, makes through hole become crescent; (3) camera lens that has crescent through hole iris diaphragm structure is changed; (4) other meets any form of this function.
Preferably, the center of circle of the external arc described in definition to the vector in the center of circle of Inner arc be through hole towards, being oriented from the horizontal by 45 ° of through hole.Through the so a kind of disposing way of meticulous optimum choice, two crescent through holes towards, one towards bottom right 45 degree, one towards upper left 45 degree.Or towards upper right, lower-left 45 degree, effect is identical.For through hole towards, other direction also can also be used to use in couples, and such as laterally relatively, longitudinally relatively, and other are relatively arbitrarily angled, can adjust according to the manufacture craft of iris diaphragm structure.
Embodiment one: single-lens system, wherein iris diaphragm structure is iris ring, make described crescent through hole have 2 kinds towards, 2 kinds towards the center of circle Central Symmetry along external arc, the center of circle of the external arc described in definition to the vector in the center of circle of Inner arc be through hole towards.The object of such setting is: during owing to obtaining the image of total focus, need shooting 2 width image, come from the aperture (concrete principle is shown in lower images disposal route) of the crescent through hole of 2 kinds of relative orientations respectively, namely through hole towards the center of circle Central Symmetry along external arc, if this iris diaphragm structure is iris ring, then can have these two kinds towards, respectively when these two kinds towards take image (this object can be reached by the setting of camera and corresponding adjustment), 2 required width images can be obtained, without the need to changing camera lens, convenient.
Although shooting time need 2 kinds towards iris diaphragm structure use in pairs, but it is also parts with specific function---enter camera lens for allowing light, and when selling, only have a kind towards iris diaphragm structure also can sell separately (such as one of them has been gone bad needs again to join), therefore only have a kind towards iris diaphragm structure be construed as a complete technical scheme.
Embodiment two: to stationary body, adopts embodiment one to be no problem, but when object is dynamic, very strict to the time requirement of shooting, 2 width images must be taken simultaneously and just can reach better effect.Therefore, for the shooting of dynamic object, the preferred technical scheme that the present invention adopts is: use two camera lenses, (all right setting up and down, oblique setting, only needs the visual angle of imaging system, optical axis all unanimously) placed side by side composition twin-lens system.An iris diaphragm structure with crescent through hole is placed in respective inside.2 crescent through holes towards relatively, namely along mid point Central Symmetry therebetween, as shown in Figure 1.Camera lens with this kind of iris diaphragm structure is furnished with a lens systems at each iris diaphragm structure, form two groups of imaging systems, visual angle, the optical axis of two groups of imaging systems are all consistent, because the distance between two crescent through holes is very near, be far smaller than the distance between scenery and camera lens, the two width image approximate no parallaxs therefore adopting this structure to take.
Embodiment three: use multiple camera lens to combine, separately an inner placement iris diaphragm structure with crescent through hole, in pairs.Camera lens put can be left and right, up and down or other modes arrange, the aperture of the crescent through hole of a paired arrangement of mirrors head inside towards needs relatively.Such as 4 camera lenses form a system, and in pairs, two rows put.Two camera lenses arranged side by side about first row, the aperture of inner crescent through hole towards, one towards upper left 45 °, one towards bottom right 45 °; Two camera lenses arranged side by side about second row, the aperture of inner crescent through hole, one towards upper right 45 °, one towards lower-left 45 °.Certainly also have other various arrangement pose pattern, do not enumerate.Coordinate with following image processing method, also can reach the effect of " acquire image more clearly, can obtain nearly medium and long distance can both image clearly ".The program can the more image of disposable acquisition, through the calculating of image procossing, can obtain more accurate depth information and promote clearness, but the cost of the program is higher.
The camera lens including any one iris diaphragm structure above-mentioned also should fall into protection scope of the present invention.When camera lens adopts the iris diaphragm structure described in embodiment two, identical lens systems is furnished with respectively to each iris diaphragm structure, thus making each iris diaphragm structure lens systems corresponding with it form two imaging systems, the visual angle of two imaging systems, optical axis are towards unanimously.
In like manner, the camera including above-mentioned camera lens also should fall into protection scope of the present invention.
In addition, camera can also comprise 2 camera lenses, through hole in the iris diaphragm structure of wherein each camera lens is crescent, crescent through hole is made up of external arc and Inner arc, the two ends of external arc and Inner arc connect into intersection point respectively, the center of circle of the external arc described in definition to the vector in the center of circle of Inner arc be through hole be oriented from the horizontal by 45 ° towards, through hole, the through hole of two camera lenses is towards the center of circle Central Symmetry along external arc.
A kind of image processing method, as shown in Figure 4, comprises following steps:
S1, obtain 2 width images respectively: 2 width images are all taken by the camera of any one iris diaphragm structure above-mentioned, and the through hole obtaining iris diaphragm structure during 2 width image is crescent through hole, crescent through hole towards the center of circle Central Symmetry along external arc, crescent through hole is made up of external arc and Inner arc, the two ends of external arc and Inner arc connect into intersection point respectively, the center of circle of the external arc described in definition to the vector in the center of circle of Inner arc be through hole towards; The visual angle of camera during 2 width image taking, optical axis are towards unanimously, and optical imaging system is identical.
S2, the phase same point of getting in 2 width images, and the pixel window of some near this point, calculate the Fourier transform of respective pixel window.
S3, by the d value in each as required optional distance range, at frequency domain, successively calculate the frequency restoration value of one group of this point, the error of frequency domain evaluation of estimate of one group of this point, corresponding with d value; D is the distance between scenery and camera lens, determines span according to actual needs.
S4, choose the best-estimated distance value of d value corresponding to minimum error of frequency domain evaluation of estimate as this point, corresponding frequency restoration value is as the frequency domain optimal recovery value of this point.
S5, inverse-Fourier transform is carried out to the frequency domain optimal recovery value of this point, obtain the picture rich in detail value of the spatial domain of this point.
S6 can also be comprised, get in 2 width images and need each point to be processed respectively, obtain the picture rich in detail value of the spatial domain of each point, finally obtain the whole picture rich in detail needing processing section spatial domain in image.If entire image all needs process, so then travel through the point of entire image, the final picture rich in detail obtaining view picture spatial domain.
Preferably, described S1 obtains the iris diaphragm structure of 2 width images, one of them through hole be oriented from the horizontal by 45 °, that is: two through holes be oriented upper left, bottom right, or lower-left, upper right.
The principle of above-mentioned image processing method is as follows.
If change the shape of aperture through hole, the form of point spread function will change to some extent.Applicant, by large component analysis and experiment, invented the aperture with crescent through hole of this excellent effect, and two apertures needs to use in couples.In the aperture position of two camera lenses, the aperture of each built-in crescent through hole, both opening angles are relative, such as 45 degree, bottom right and 45 degree, upper left.These two camera lenses towards, must face toward same direction, make the visual angle of these two camera lenses consistent, imaging is overlapping, as shown in Figure 2.When taking pictures, by the aperture of the relative crescent through hole of 2 opening angles and identical the first imaging system of structure and the second imaging system, obtain 2 width images simultaneously, be designated as f
1and f
2, the distance in 2 width images between scenery with camera lens is identical, is designated as d '.After using Fourier transform, for the image that the first imaging system obtains, be written as following form at frequency domain:
For the image that the second imaging system obtains, be written as following form at frequency domain:
In formula, f
0the image that should obtain during for ideally focusing on accurate, F
0for f
0fourier transform, F
1and F
2be respectively f
1and f
2fourier transform,
with
the distance being respectively the first imaging system and the second imaging system is the Fourier transform that the point spread function of d ' is corresponding, ζ
1and ζ
2be respectively the noise η of the first and second imaging systems
1and η
2fourier transform.
The mathematical problem that will solve here is, after having taken pictures, only uses such two width images, how by them, solves the best-estimated distance value
the most close to the distance d of camera lens with original scenery, and calculate frequency restoration value
make
with ideal image (frequency domain) F
0the most close.This is mathematically that a maximum a posteriori probability Approximation Problem is (a kind of from measured value, observed reading in fact, through calculating the method obtained closest to actual value), this kind of problem is all can solve by the universal method of Tiknonovregularization (normalization).Here we have had two width images, and the method just becomes and can calculate with the Wiener convolution method of a general form, calculate frequency restoration value by such as under type
In formula,
for the best-estimated distance value,
be
conjugate matrices,
be
conjugate matrices, C is the fixed coefficient of this imaging system, relevant with the maximum perforate of lens aperture, noisiness, lens focus characteristic, can measure through specific method of testing and calculate.
But we also do not know the best-estimated distance value
this is how many, how to calculate
? we can come as error assessment function by a residual error, tentatively scan each probable value that d belongs to D space one by one, so can obtain the error of frequency domain evaluation of estimate W of one group of this point
(d),
Employ two crescent apertures of the present invention, d is belonged to each sampling value in each D space.Bring above-mentioned formula into, obtain one group of W
(d)value.As this error of frequency domain evaluation of estimate W
(d)when there is minimum value, d corresponding is with it exactly the best-estimated distance value of this position, and as shown in Figure 3, its meaning is, if use this d value to calculate
the frequency restoration value obtained
may be just close to the desired value in ideal the most, i.e. frequency domain optimal recovery value.The sampling value of d need not be too many, otherwise calculated amount is too large, enough.The space of such as D value is that { 0.25,0.5,0.75,1.0,1.5,2.0,2.5,3,4,6,10}, unit is rice, can also select suitable D space and the distance values of neighbor distance as required.
For image space, each position (x of our scan image one by one, y), get the pixel range of some near it, such as 8 × 8 pixels, or the window of 5 × 5,7 × 7 pixel sizes (this belongs to this area routine techniques means, those skilled in the art all know to get when obtaining Fourier transform near the pixel range of some be how many pixels).As stated above, error of calculation evaluation of estimate successively, obtains the best-estimated distance value of each position, is designated as U (x, y), the depth map of Here it is whole image space, or is called distance map, is designated as follows:
Next, naturally just easily obtain Fourier transform state (frequency domain) I (x, y) of the picture rich in detail value in this locational space territory, be designated as follows:
Only need to carry out inversefouriertransform to it, being transformed into spatial domain, has been exactly so the picture rich in detail value of the spatial domain of this position.If each position calculates use
so each region is by clear, and the picture rich in detail being designated as the spatial domain recovered is f
new(x, y).
f
new(x,y)＝IFFT(I(x,y))
In the image processing process of this series of complex, having obtained the depth information of object in scenery, is exactly the distance with video camera.These depth informations, can be used for doing many application, are such as used in the application of gesture control, in traditional technology, the upper and lower motion in left and right easily identifies, the action of front and back is not easy to identify, according to technology of the present invention, can be easy to obtain the information seesawed.In addition, also may be used for the application of 3D scanning, from multiple angle, an object is taken pictures, and then extract, construct the 3D moulding of object.Owing to obtaining the range information of object in scenery, also the application focused on afterwards of first taking pictures can be realized.Method is that the image processed and range information are preserved simultaneously, user is in aftertreatment or when browsing, select which region, just the distance scenery corresponding to this region can be done sharpening process, the image-region of other distances does corresponding Fuzzy processing, and simultaneously fuzzy degree is relevant with the distance of scenery.Achieve background blurring, stressing main like this, reduce depth of field etc. effect, a kind of new Consumer's Experience and enjoyment are provided.
Above embodiment is only for illustration of design philosophy of the present invention and feature, and its object is to enable those skilled in the art understand content of the present invention and implement according to this, protection scope of the present invention is not limited to above-described embodiment.So all equivalent variations of doing according to disclosed principle, mentality of designing or modification, all within protection scope of the present invention.
Claims (10)
1. an iris diaphragm structure, comprising the through hole for allowing light enter camera lens, it is characterized in that: described through hole has at least a form to be crescent through hole.
2. iris diaphragm structure according to claim 1, it is characterized in that: described crescent through hole is made up of external arc and Inner arc, the two ends of external arc and Inner arc connect into intersection point respectively, allowing by the part of light is crescent, the center of circle of the external arc described in definition to the vector in the center of circle of Inner arc be through hole towards, wherein the diameter of external arc is the diameter of the maximum ring size of camera lens, and the diameter of Inner arc is 0.4-0.8 times of external arc diameter.
3. iris diaphragm structure according to claim 2, is characterized in that: described through hole is 2 and in same plane, 2 crescent through holes towards along mid point Central Symmetry therebetween.
4. iris diaphragm structure according to claim 2, is characterized in that: iris diaphragm structure is iris ring, make described crescent through hole have 2 kinds towards, 2 kinds towards the center of circle Central Symmetry along external arc.
5. a camera lens, is characterized in that: it includes as the iris diaphragm structure in Claims 1-4 as described in any one.
6. a camera, is characterized in that: it includes camera lens as claimed in claim 5.
7. a camera, it is characterized in that: it comprises the camera lens of about 2 or placement side by side up and down, through hole in the iris diaphragm structure of wherein each camera lens is crescent, crescent through hole is made up of external arc and Inner arc, the two ends of external arc and Inner arc connect into intersection point respectively, allowing by the part of light is crescent, the center of circle of the external arc described in definition to the vector in the center of circle of Inner arc be through hole towards, through hole be oriented from the horizontal by 45 °, the through hole of two camera lenses is towards along mid point Central Symmetry therebetween.
8. an image processing method, is characterized in that: it comprises following steps:
S1, obtain 2 width images respectively:
2 width images are all taken by the camera with the iris diaphragm structure described in claim 3 or 4, and the through hole obtaining iris diaphragm structure during 2 width image is crescent through hole, crescent through hole towards the center of circle Central Symmetry along external arc, crescent through hole is made up of external arc and Inner arc, the two ends of external arc and Inner arc connect into intersection point respectively, the center of circle of the external arc described in definition to the vector in the center of circle of Inner arc be through hole towards; The visual angle of camera during 2 width image taking, optical axis are towards unanimously, and optical imaging system is identical;
S2, the phase same point of getting in 2 width images, and the pixel window of some near this point, calculate the Fourier transform of respective pixel window;
S3, by the d value in each as required optional distance range, at frequency domain, successively calculate the frequency restoration value of one group of this point, the error of frequency domain evaluation of estimate of one group of this point, corresponding with d value; D is the distance between scenery and camera lens, determines span according to actual needs;
S4, choose the best-estimated distance value of d value corresponding to minimum error of frequency domain evaluation of estimate as this point, corresponding frequency restoration value is as the best frequency restoration value of this point;
S5, inverse-Fourier transform is carried out to the best frequency restoration value of this point, obtain the picture rich in detail value of the spatial domain of this point.
9. image processing method according to claim 8, it is characterized in that: also comprise S6, scan in 2 width images and need each point to be processed one by one, obtain the picture rich in detail value of the spatial domain of each point, the whole picture rich in detail needing processing section spatial domain in final acquisition image.
10. image processing method according to claim 8, is characterized in that: described S1 takes the iris diaphragm structure of 2 width images, being oriented from the horizontal by 45 ° of one of them through hole.
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