CN106097343B - Optical field imaging equipment axial resolution measurement device and method - Google Patents
Optical field imaging equipment axial resolution measurement device and method Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
- H04N17/002—Diagnosis, testing or measuring for television systems or their details for television cameras
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- G06T2207/10052—Images from lightfield camera
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Abstract
The present invention provides a kind of optical field imaging equipment axial resolution measurement device and methods, on the optical axis direction of optical field imaging equipment, more than two label target plates are placed in such a way that mutual shielding rate is lower than 50%, ensure mark target plate optical field imaging equipment within sweep of the eye, and using optical field imaging equipment obtain label target plate pass through the amplified virtual image of convex lens component.The present invention is suitble to the optical field imaging device with larger axial areas imaging to use, to the theory of optical field imaging equipment axial resolution can measurement range from zero to infinity, have the advantages that small volume structure is compact, be conducive to that the performance of different optical field imaging systems is analyzed and compared, and convenient for being integrated in other specific optical field imaging application systems.
Description
Technical field
The present invention relates to digital imagery, calculate photography, image procossing, computer vision field, and in particular to adopt to light field
The performance evaluation and parameter calibration of acquisition means.Apparatus and method of the present invention can be used for optical field imaging equipment (especially double flat
Surface model optical field imaging equipment) axial resolution be measured.
Background technique
In recent years, the calculating photography in conjunction with contemporary optics imaging theory and visual pattern computational theory is considered as number
The innovation revolutionary again of imaging field.Optical field imaging theory is realized as one of the representative theory for calculating photography
Innovative interactive image generates.
1996, American researcher proposed to record the position of light and angle in space using one group of parallel biplane
Information, and a camera is mounted on mobile mechanical arm to the acquisition realized for the first time to four-dimensional light field, referring to grinding for Levoy etc.
Study carefully paper Levoy M, Hanrahan P.Light field rendering.Proceedings of conference on
Computer graphics and interactive techniques.pp.31-42,1996. optical field imaging system can be real
Existing traditional imaging systems are difficult to the effect obtained, such as digital refocusing, viewpoint change, the controllable depth of field, scene depth can calculate.
2005, Stanford University doctor Ren Ng realized the quick meter of light field refocusing using Fourier transform theory in a frequency domain
It calculates, and devises the integrated form light-field camera based on microlens array, i.e. Plenoptic 1.0.Due to using Plenoptic
1.0 have that image resolution ratio is lower, and Adobe company researcher improves the design of Plenoptic 1.0,
Microlens array in light-field camera is changed to the focusing design of Plenoptic 2.0, it is advantageous that it can flexibly be adjusted
Whole angle and image resolution ratio.On the basis of 2.0 Plenoptic, German Raytrix company researcher's use is more high-quality
The image device of amount designs the professional light-field camera for meeting industry with scientific research purposes, product image resolution with higher
Rate.
Based on optical field imaging theory, domestic and international more companies and scientific research institution are devised such as camera array, lenticule
The variety classes optical field imaging system such as array light-field camera, light field microscope, one of most important advantage, which is to have, " first claps
It is take the photograph, rear to focus " digital refocusing ability.Since 2010, Adobe, Lytro, Raytrix, Nokia, Toshiba,
The companies such as Pelican are proposed the portable light field imaging system for respectively facing consumer electronics market respectively.
The problem of that there are still image resolution ratios is lower for existing optical field imaging system, digital refocusing scarce capacity.Such as the U.S.
Lytro company uses the first generation light-field camera of Plenoptic1.0 design, captures light field with the sensor of 11,000,000 pixels, but
Only obtain the light field image of 700,000 pixel resolutions.The said firm in 2014 has issued sensor again and has upgraded to 40,000,000 pixels
Illum light-field camera, but its exportable image resolution ratio is also only 4,000,000 pixels.In order to obtain higher image resolution ratio,
German Raytrix company devises focusing light-field camera Plenoptic2.0.But focusing light-field camera promotes image point
The cost of resolution is reduction of optical field imaging axial resolution (hereinafter：Axial resolution, Axial resolution).Light
Field axial resolution may be defined as indistinguishable most along the focal zone imaging difference of the adjacent refocusing image of key light axis direction
Large-spacing.Axial resolution is considered as the important indicator for measuring light field refocusing precision and imaging system characteristic, reflects light field
The refocusing ability of imaging system.Light field axial resolution is particularly important for needing the application field of high axial observation precision,
Such as 2014, Prevedel etc. proposed a kind of light for combining using powerful micro-imaging hardware system and promoting axial resolution
Field imaging 3D deconvolution method, realizes to the movable microscopic observation of biological neural, research achievement is published in current year
On Nature magazine, referring to Prevedel R, Yoon Y.G, Hoffmann M, et.al.Simultaneous whole-
animal 3D imaging of neuronal activity using light-field microscopy.Nature-
Methods.Vol11,pp:727-730,2014。
For the axial resolution of optical field imaging equipment, foreign study personnel are first from signal processing angle analysis signal
It tests, sample the influence of noise and optical multiplexer to optical field imaging systemic resolution and imaging characteristic, and use wave optics model
Analyze influence of the light field sampling mode to image resolution ratio and axial resolution.Although the focusing surface of optical field imaging can number
Change setting, but the discrete sampling mode of light field equipment and hardware specification limit, so that the axial resolution of light field exists theoretically
Limit.Different into linear change with axial position variation from image resolution ratio, optical field imaging equipment axial resolution is with axial position
It sets variation and not meets linear relationship.Different types of optical field imaging equipment has differences due to designing with image-forming block parameter,
Its axial resolution naturally occurring is different.For same optical field imaging equipment, due to the production of its image-forming block, processing and installation
There are error, equipment axial resolution characteristic curve and theory have different again, it is therefore desirable to different optical field imaging equipment
Axial resolution be measured.
In order to measure imaging system axial resolution, existing method has chosen the three-dimensional samples of known geometry mostly,
By directly being measured and assessment system entirety axial resolution sample.For example, axial to Medical CT scanning imaging system
Resolution ratio carries out sample spiral and is sliced method for measuring, referring to Flohr TG, Stierstorfer K, Ulzheimer S, et
al.Image reconstruction and image quality evaluation for a 64 slice CT
scanner with z flying focal spot.Med Phys,Vol32,pp：2536-2547,2005. for another example, utilizes three
The method that resolving power test target carries out axial resolution measurement to optical coherence tomography (OCT) imaging device is tieed up, is used for OCT referring to one kind
The dimensional resolution plate and its application method of performance evaluation, Chinese patent, CN103932682A, 2014.However, above-mentioned to imaging
The used device size of the method that system axial resolution ratio measures is fixed, to the range of measurement imaging system axial resolution
It has certain limitations, therefore is not suitable for being measured optical field imaging system axial resolution ratio.
Summary of the invention
For overcome the deficiencies in the prior art, the present invention provides a kind of pair of optical field imaging equipment and carries out axial resolution measurement
Device and method be able to solve using contrast difference's method based on image to different optical field imaging equipment axial resolutions
The quick computational problem of curve.
The technical solution adopted by the present invention to solve the technical problems is：A kind of optical field imaging equipment axial resolution measurement
Device, including convex lens component, label target plate and optical field imaging equipment, on the optical axis direction of optical field imaging equipment, with mutual
Mode of the shielding rate lower than 50% places more than two label target plates, it is ensured that label target plate is in optical field imaging equipment field range
It is interior, and label target plate is obtained using optical field imaging equipment and passes through the amplified virtual image of convex lens component.
The convex lens component is made of an optics convex lens or multiple optical lenses worked in coordination, can be along light
Field imaging device main lens optical axis direction is mobile, the field range of the size covering optical field imaging equipment of convex lens component.
The described label target plate target plate different using respective design and color, the distance between each label target plate and
Label target plate can continuously adjust at a distance from convex lens inter-module.
The label target plate is stamped in the horizontal direction and vertical direction on its surface pattern, and the pattern is through convex
It is captured after lens subassembly amplification by optical field imaging equipment, and in pattern in addition to lines joint, the interval of different lines is not less than 1
A pixel.
The label target plate is located within one times of focal length of convex lens component.
The convex lens component in imaging process object distance, at a distance of and the relationship of focal length meet Gaussian imaging equation.
The present invention also provides a kind of optical field imaging equipment axial resolution measuring methods, include the following steps：
Step 1, optical field imaging equipment obtains each label target plate virtual image by once shooting；Axis between label target plate
Different axial positions is selected to carry out digital refocusing imaging into interval；If the digital reunion close-burning of axially different position
Fruit has differences, then it is assumed that has in the axially spaced-apart of difference label target plate apart and distinguishable property is imaged；If axially different position
Difference is not present in the digital refocusing imaging results set, then within the scope of the axial largest interval of different label target plates apart, imaging
As a result do not have distinguishable property；
Step 2, for different virtual image positions, constantly expand axial largest intervals between different label target plates away from
From, and the imaging difference for repeating step 1 differentiates process, up to the digital reunion close-burning of all axial positions between different label target plates
Difference is not present in fruit, is thought at the average value of different label target plate virtual image positions at this time, the axial direction point of optical field imaging system
Resolution is the axial largest interval distance marked between target plate.
The method of discrimination of the axially different position digital refocusing result difference includes but is not limited to that pixel difference is absolute
It is poor to be worth comparison method, pixel difference statistical comparison method, image statistics comparison in difference method, image characteristic point comparison method and image gradient
Different comparing difference method.
The method of the number refocusing imaging includes light field airspace and frequency domain refocusing algorithm, and using in quick Fu
The light field number refocusing accelerating algorithm of leaf transformation.
The beneficial effects of the invention are as follows：Two-dimensional calibrations plate and axial point of the progress of three-dimensional scaling plate are directlyed adopt different from existing
Resolution method for measuring, the present invention due to use acquisition the one group echo target plate virtual image method so that label target plate size, with
The distance of imaging device can be adjusted conveniently, therefore the optical field imaging device with larger axial areas imaging is suitble to make
With, the present invention to the theory of optical field imaging equipment axial resolution can measurement range from zero to infinity.
Since present invention label target plate is adjusted in one times of focal range of convex lens component, the program can effectively contract
The size of physics axial regulating mechanism in small device, so that the invention device be made to have the advantages that small volume structure is compact.
The present invention carries out the axial resolution measure and calculation method of contrast difference, the party using light field refocusing image is obtained
The numerical value calculatingization process of method is conducive to that the performance of different optical field imaging systems is analyzed and compared, and convenient in other spies
It is integrated in fixed optical field imaging application system.
Detailed description of the invention
Fig. 1 be mark target plate convex lens at the virtual image light path schematic diagram；
Fig. 2 is adjustment label target plate spacing distance and imaging interval apart from schematic diagram；
Fig. 3 is optical field imaging equipment axial resolution measurement device schematic diagram；
Fig. 4 is single convex lens schematic diagram that the present invention uses, wherein (a) is the front view of simple lens, it is (b) side of (a)
View is (c) that simple lens clamps side view, is (d) that simple lens clamps schematic diagram；
Fig. 5 is axial resolution measurement label target plate schematic diagram, wherein figure (a), (c), (e), (g), (i) are patterns
5 different group echo target plates, figure (b), (d), (f), (h), (j) are 45 degree of the side visual angle figure of 5 group echo target plates respectively.
Specific embodiment
The present invention provides a kind of optical field imaging equipment axial resolution measurement device, which includes：
One optical module (hereinafter referred to as convex lens component) with convex lens optical characteristics, can set along optical field imaging
Standby main lens optical axis direction is moved forward and backward.
One group of axial resolution measurement label target plate (hereinafter referred to as label target plate), which sets with optical field imaging
It is standby to be located at convex lens component two sides.
The convex lens component is made of an optics convex lens or multiple optical lenses worked in coordination.
The convex lens component be in optical field imaging equipment and label target plate between, and the component size covering light field at
As the field range of equipment.
The one group echo target plate thin plate composition different using two and its above design and color, and be distributed in
On optical field imaging equipment optical axis direction, the distance between label target plate can be continuously adjusted.
The one group echo target plate, surface can stamp in the horizontal direction and the vertical direction pattern, pattern warp
After the amplification of convex lens component, it can be captured by optical field imaging equipment, and in addition to lines joint, the interval of different lines need to be not less than
1 pixel.
The convex lens component, object distance in imaging process, at a distance of and the relationship of focal length meet Gaussian imaging equation.
The convex lens component with label target plate between at a distance from can continuously adjust so that label target plate in convex lens group
Within one times of focal length of part, convex lens component is to label target plate at the virtual image of upright amplification at this time.
The amplified virtual image of label target plate planoconvex lens component can be captured by optical field imaging equipment.
Optical field imaging equipment carries out shooting and refocusing at virtual image position in convex lens component institute to label target plate.
Mark adjusting for target plate virtual image position can be by the spacing distance of aignment mark target plate and convex lens component come real
It is existing.From apart from convex lens component be zero position being capable of flexible setting to infinite distant positions.
The distance between two or more label target plates can continuously adjust, label target plate at the virtual image spacing distance
Also it changes correspondingly.
After optical field imaging equipment takes the image data of two or more label target plate, light field airspace or frequency domain can be used
Data processing technique carries out refocusing imaging in different focal planes.
The primary shooting of optical field imaging equipment, available two or more label target plate data.Label target plate it
Between axially spaced-apart within the scope of, different axial position may be selected and carry out digital refocusing imaging.If the number of axially different position
Word refocusing result has differences, then it is assumed that in the axially spaced-apart of difference label target plate apart, has and distinguishable property is imaged；Instead
It, difference is not present in the digital refocusing imaging results of axially different position, then between the axial maximum of different label target plates apart
Every in range, imaging results do not have distinguishable property.
For different virtual image positions, constantly expands the axial largest interval distance between different label target plates, lay equal stress on
Multiple imaging difference differentiates process, until difference is not present in the digital refocusing result of all axial positions between different label target plates
It is different, at this time it is believed that the axial resolution of optical field imaging system is label at the average value of different label target plate virtual image positions
Axial largest interval distance between target plate.
The method for judging axially different position digital refocusing result difference includes but is not limited to：Pixel difference absolute value ratio
Compared with method, pixel difference statistical comparison method, image statistics comparison in difference method, image characteristic point comparison method, image gradient diversity ratio
Compared with the methods of method of difference.
Light field number refocusing imaging algorithm includes light field airspace and frequency domain refocusing algorithm, and uses fast Fourier
The light field number refocusing accelerating algorithm of transformation.
Present invention will be further explained below with reference to the attached drawings and examples, and the present invention includes but are not limited to following implementations
Example.
On the optical axis direction of optical field imaging equipment, more than two marks are placed in such a way that mutual shielding rate is lower than 50%
Remember target plate.Ensure mark target plate optical field imaging equipment within sweep of the eye, and using optical field imaging equipment obtain label target plate warp
The amplified virtual image of excess convexity lens subassembly.
For axial resolution measurement device according to an embodiment of the present invention, convex lens component is to label target plate at amplification
The virtual image, as shown in Figure 1.Its imaging relations meets Gauss imaging law, and u is enabled to represent object distance, and v represents image distance, and f represents focal length.
Label target plate object distance meets u ∈ [0, f].Object distance u and virtual image position v meet formula (2), virtual image position meet v ∈ [0 ,+
∞).The spacing distance Δ z of difference label target plate a and b and its institute are shown at the spacing distance Δ z ' calculating such as formula (3) of the virtual image
The present invention measures the axial resolution of optical field imaging equipment in such a way that adjustment marks target plate distance interval, such as schemes
2.Target plate P will be markedaAnd PbIt is placed within one times of focal length of convex lens component and the side far from optical field imaging equipment, it is convex at this time
Lens subassembly is to label target plate at the virtual image P of upright amplificationa' and Pb', adjust the interval delta z=of different label target plates | ua-ub|,
There is the interval variation amount Δ z ' of confirmable different label target plate virtual image positions at this time according to formula (3).Due to virtual image forming
Position-adjustable range from 0 to infinity at a distance, therefore between two different label target plates virtual image location interval Δ z ' adjustable model
It is also remote from 0 to infinity for enclosing.
The embodiment of the present invention needs to adjust label target plate largest interval twice or more.It is intended to measure a certain axial position
It, need to be in 1 times of focal range of convex lens component, centered on the object distance of position to be measured, according to ascending when axial resolution
Mode adjust the distance interval Δ z of label target plate, thus ascending change label target plate at the virtual image distance interval
Δz′.Behind each adjustment label target plate interval, need in the interior switching focussing plane of virtual image position largest interval Δ z ', thus
To the light field number refocusing imaging results of no less than two groups difference focussing planes.In turn, the present invention is according to preset figure
The different comparison threshold value T of aberration, the result of counterweight focal imaging carry out axial resolvability judgement, and discrepancy threshold T is that there are images
The pixel ratio of difference should regard the particular value that concrete condition setting is not more than 10%, i.e., (0,0.1] between.Difference pixel ratio
Greater than the threshold value then refocusing imaging results difference be it is distinguishable, otherwise think that the difference of refocusing imaging results is inseparable
It distinguishes.The above process obtains the indistinguishable largest interval of imaging results difference repeatedly, then measures the axial direction point in this virtual image position
Resolution is current markers target plate largest interval distance Δ z '.Above-mentioned axial resolution measuring method is able to solve axial resolution
Quantitative determination problem, specific steps are summarized as follows：
Step1. the counterpart for needing to measure the position v of axial resolution is calculated away from u according to formula (2).Target plate will be marked
It is placed in 1 times of focal length of convex lens component, the position for being u apart from convex lens, and it is minimum to be allowed to labels targets plate axial distance.
Step2. Image Acquisition is carried out with light field imaging device.In the virtual image position largest interval Δ z ' inscribe of label target plate
Focussing plane is changed, the light field number refocusing imaging results of no less than two groups of different focussing planes are obtained.
Step3. the resolvability judgement of imaging results is carried out using above-mentioned image difference control methods.As imaging results can
It differentiates, then calculates current largest interval Δ z ', the output as axial resolution measurement result according to formula (3)；Otherwise, it goes to
step4。
Step4. centered on u, with it is current desired measurement axial resolution precision unit (as millimeter, centimetre) be step
Into the imaging position for recalculating label target plate according to formula (2) turns step2 to expand Δ z '.
Optical field imaging equipment axial resolution measurement device provided by the invention includes 4 parts, as shown in Figure 3：
One optics convex lens 301；
One group echo target plate 302；
One accurate axial displacement regulating member 303；
One group of mating auxiliary light source system 304.
Light field axial resolution measurement device of the invention fixes optics convex lens 301 using one group of auxiliary stand, and will
The fixation bracket is mounted on one group of guide rail as shown in Fig. 3 303, which has scale, can be to being installed on guide rail
Component carry out optical field imaging equipment optical axis direction on accurate positioning.The auxiliary of optics convex lens surrounding arrangement as illustrated at 304
LED lamp is illuminated, is illuminated to the surface to label target plate.Label target plate 302 is similarly installed on 303 guide rail, different
The spacing distance of label target plate can be adjusted neatly.
The present invention uses one group of horizontal positioned guide rail, and guide rail need to be placed in the optical axis side of measured light field imaging device
Upwards, guide rail y direction should be parallel with the optical axis of optical field imaging equipment, can guarantee convex lens and label on guide rail in this way
Target plate is within the scope of the shooting visual angle of optical field imaging equipment.The axially adjustable precision of different components need to be less than 0.1mm on guide rail,
It is 0mm -750mm that the present invention, which implements the guide rail adjustable extent selected, and 1 times of focal length that axial length should be greater than convex lens is long
Degree.
The present invention uses a diameter for 200mm, and the single convex lens of the large size that focal length is 350mm, surface curvature radius is about
For 285mm.To guarantee that convex lens optically has big focal length, low dispersivity, which is the K9 optics of thickness 3mm
Glass, refractive index are about 1.52, Abbe number 63.5, as shown in Figure 4.To convex lens using quadrangle support system into
Row fix, to facilitate the enterprising line position of optical axis direction in optical field imaging equipment to set adjusting, and guarantee convex lens optical axis and light field at
As the optical axis of equipment is overlapped as far as possible.
Implementation process of the present invention uses a group echo target plate, which is mainly used for distinguishing the weight of optical field imaging equipment
Focal imaging difference.Label target plate use diameter for 2 centimetres of white background chip card, card mark different level just like Fig. 5,
Vertically, round or radial-like streak, the pattern that adjacent stripes select black, red, green, blue alternate.Label target plate need to be adopted
It is fixed with bracket, the spacing distance and axial position of label target plate is adjusted, and to mark target plate in optical field imaging equipment
In angular field of view.When acquiring label target plate image using optical field imaging equipment, and in addition to lines joint, the interval of different lines
1 pixel should be not less than.
When shooting the data for measuring optical field imaging equipment axial resolution, to the position v that need to measure axial resolution,
Its object distance u is calculated according to formula 3, u should be less than 1 times of focal length of convex lens.1 label is respectively placed in the front and rear sides of object distance u
Target plate, the object distance relative to convex lens distinguish u1And u2, virtual image position v formed by target plate is respectively marked at this time1And v2It will meet
The axially spaced-apart of formula 2, virtual image position is | v1-v2|.When being shot, optical field imaging equipment from the other side of convex lens into
The acquisition of row data.
To label target plate virtual image position v1And v2Between, light field image generation is carried out according to light field number refocusing method.On
Stating light field refocusing method can be used air space algorithm or frequency domain method such as formula (4), reference can be made to the research paper of Levoy etc.
Levoy M,Hanrahan P.Light field rendering.Proceedings of conference on
Computer graphics and interactive techniques.pp.31-42,1996。
Wherein, I (s, t) represents two-dimension light field refocusing image, and L represents four-dimensional light field data, and (m, n, s, t) is respectively represented
The angle and position signal dimension of light field, α represent the setting factor of weight light field focusing parameter.It is imaged according to above-mentioned light field refocusing
Method obtains v1And v2Between n width light field image (I1,I2,…In), n width light field image can be by the test containing label target plate
Scene is divided into n-layer in the direction of the optical axis.
After the imaging data for obtaining optical axis direction difference focusing surface, it is poor to need to carry out the light field image of axially different position
Different comparison, so that it is determined that axial direction v1And v2The distinguishable characteristic of imaging results between position.Implementation process of the present invention uses image difference
Point method calculates image difference, as shown in formula (5).
Wherein any i, j ∈ [v1,v2] (5)
Image IiAnd IjDifference result measured using 2 norm distances, in addition 1 norm distance and Infinite Norm distance
Also it can be used as the valid metric of image difference.T is a significance of difference threshold value, the two width light field image I less than threshold value TiAnd Ij
Being regarded as image difference can not differentiate.
The continuous mode of above-mentioned axial resolution, in axial v1And v2In interval, using the above method to light field refocusing figure
As carrying out contrast difference, gradually expand axial direction v if difference can not be differentiated1And v2Distance, be until its difference is distinguishable
Only.V at this time1And v2Spacing distance, the axial resolution measurement result of as current axial position.
Claims (8)
1. a kind of optical field imaging equipment axial resolution measurement device, including convex lens component, label target plate and optical field imaging are set
It is standby, it is characterised in that：On the optical axis direction of optical field imaging equipment, by mutual shielding rate lower than place in a manner of 50% two with
On label target plate, it is ensured that label target plate optical field imaging equipment within sweep of the eye, and using optical field imaging equipment obtain label
Target plate passes through the amplified virtual image of convex lens component.
2. optical field imaging equipment axial resolution measurement device according to claim 1, it is characterised in that：The convex lens
Mirror assembly is made of an optics convex lens or multiple optical lenses worked in coordination, can be along optical field imaging equipment main lens light
Axis direction is mobile, the field range of the size covering optical field imaging equipment of convex lens component.
3. optical field imaging equipment axial resolution measurement device according to claim 1, it is characterised in that：The label
The target plate target plate different using respective design and color, the distance between each label target plate and label target plate and convex lens group
Distance between part can continuously adjust.
4. optical field imaging equipment axial resolution measurement device according to claim 1, it is characterised in that：The label
Target plate is stamped in the horizontal direction and vertical direction on its surface pattern, by light after the pattern planoconvex lens component amplification
Field imaging device captures, and in pattern in addition to lines joint, and the interval of different lines is not less than 1 pixel.
5. optical field imaging equipment axial resolution measurement device according to claim 1, it is characterised in that：The label
Target plate is located within one times of focal length of convex lens component.
6. a kind of optical field imaging equipment axial resolution measuring method using claim 1 described device, it is characterised in that packet
Include following step：
Step 1, optical field imaging equipment obtains each label target plate virtual image by once shooting；Between axial direction between label target plate
It is imaged every selecting different axial positions to carry out digital refocusing in range；If the digital refocusing result of axially different position is deposited
In difference, then it is assumed that have in the axially spaced-apart of difference label target plate apart and distinguishable property is imaged；If axially different position
Difference is not present in digital refocusing imaging results, then within the scope of the axial largest interval of different label target plates apart, imaging results
Without distinguishable property；
Step 2, for different virtual image positions, constantly expand the axial largest interval distance between different label target plates, and
The imaging difference for repeating step 1 differentiates process, until the digital refocusing result of all axial positions is equal between different label target plates
There is no differences, are thought at the average value of different label target plate virtual image positions at this time, the axial resolution of optical field imaging system
For the axial largest interval distance between label target plate.
7. optical field imaging equipment axial resolution measuring method according to claim 6, it is characterised in that：It is described not coaxial
Method of discrimination to position digital refocusing result difference includes but is not limited to pixel difference absolute value comparison method, pixel difference system
Count comparison method, image statistics comparison in difference method, image characteristic point comparison method and the image gradient comparison in difference method of difference.
8. optical field imaging equipment axial resolution measuring method according to claim 6, it is characterised in that：The number weight
The method of focal imaging includes light field airspace and frequency domain refocusing algorithm, and the light field number weight using Fast Fourier Transform (FFT)
Focus accelerating algorithm.
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| CN109406105B (en) * | 2017-08-17 | 2021-06-18 | 宁波舜宇车载光学技术有限公司 | Virtual image detection method and detection system |
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