EP2732616A1 - Systeme optique a codage de pupille asservi - Google Patents
Systeme optique a codage de pupille asserviInfo
- Publication number
- EP2732616A1 EP2732616A1 EP12733679.0A EP12733679A EP2732616A1 EP 2732616 A1 EP2732616 A1 EP 2732616A1 EP 12733679 A EP12733679 A EP 12733679A EP 2732616 A1 EP2732616 A1 EP 2732616A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- filter
- optical system
- phase
- optical
- image
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/42—Diffraction optics, i.e. systems including a diffractive element being designed for providing a diffractive effect
- G02B27/46—Systems using spatial filters
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0075—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 with means for altering, e.g. increasing, the depth of field or depth of focus
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/60—Control of cameras or camera modules
- H04N23/69—Control of means for changing angle of the field of view, e.g. optical zoom objectives or electronic zooming
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
- H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
- H04N3/14—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by means of electrically scanned solid-state devices
- H04N3/15—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by means of electrically scanned solid-state devices for picture signal generation
- H04N3/155—Control of the image-sensor operation, e.g. image processing within the image-sensor
- H04N3/1562—Control of the image-sensor operation, e.g. image processing within the image-sensor for selective scanning, e.g. windowing, zooming
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N5/00—Details of television systems
- H04N5/222—Studio circuitry; Studio devices; Studio equipment
- H04N5/2224—Studio circuitry; Studio devices; Studio equipment related to virtual studio applications
- H04N5/2226—Determination of depth image, e.g. for foreground/background separation
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B2207/00—Coding scheme for general features or characteristics of optical elements and systems of subclass G02B, but not including elements and systems which would be classified in G02B6/00 and subgroups
- G02B2207/125—Wavefront coding
Definitions
- the field of the invention is that of optical systems comprising image processing means using the pupil coding.
- These systems comprise an optical objective, a phase and / or amplitude filter, a photosensitive detector and an image processing unit capable of processing the data in real time or in deferred time.
- the object of the invention is to use image processing to relax opto-mechanical constraints or to simplify the combination of the objective or to increase the performance of the entire system or to maintain the performance of the objective in harsh environments including significant temperature changes.
- One of the aims of the invention is also to increase the depth of field so as to improve the perception of relief in the context, for example, of biocular driving applications in thermal vision.
- the simplification lies, for example, in the removal of a focus mechanism driving a lens group along the optical axis to compensate for temperature or pressure variations while keeping a sharp image on the detector.
- this mechanism is also used to switch from infinity aiming to finite distance aiming.
- the invention uses a known principle: the pupil coding which consists in inserting into an optical combination at the level of the pupil of the objective an optical filter which is generally a phase and / or amplitude plate making it possible to increase the depth of field.
- the image is deconvoluted by the signature of the lens with this blade to maintain a quality of the image in a given depth of field range.
- FIG. 1 represents an optical system comprising focusing optics comprising such a filter.
- This optics comprises three lenses L1, L2 and L3, two conventional optical filters F1 and F2 producing, for example, the desired spectral transmission and the pupil coding filter ⁇ .
- the filter is disposed in the vicinity of the pupil P, the point of convergence of the field radii in FIG. It could also be disposed on the rear face of the lens L2 so as to reduce the optical interfaces.
- the operating principle of the filter uses deconvolution by the percussional response of optics or "PSF", an acronym for "Point Spread Function".
- PSF percussional response of optics
- p is the response of the system to an infinitely small object. If we know the percussional response p of an optics, knowing an object f, the image f of f given by optics is:
- the deconvolution filter is the inverse filter.
- SB and So are the spectral densities of noise and object. This filter approaches the inverse filter when the noise is weak and tends to 0 when the signal is weak. For optical systems whose aberrations vary in the field, we can consider multi-zone algorithms.
- the first term of the criterion ⁇ ⁇ corresponds to the inadequacy between the PSF and the selected filter
- the second term is associated with the noise of the digital deconvolution. So, if we optimize the filter for the first defocused ⁇ , then we have:
- the variation of the merit function is related to variations in the FTM of the optical system, including phase filter, as a function of the defocusing.
- the quality of the optical chain for other defocations is therefore deduced by the behavioral differences since, if we do not know a priori the defocusing, we hold the digital correction function. at a given value. For other defocus values, the filter is less well adjusted.
- FIG. 2 An example of such a filter comprising only three rings is shown in FIG. 2.
- the central ring A1 has the same phase as the peripheral ring A3;
- the phase variation of the phase filter is a polynomial in x and y.
- the phase variation of the phase filter is a polynomial in r, where r represents the distance at the center of the filter; - asymmetrical masks;
- the correction filter may also comprise an amplitude function, that is to say that it comprises, in addition to the phase function, zones with variable optical transmission.
- FIG. 3 represents two partially sectional views of a dynamic phase filter. Sure the left view, the filter is not addressed, so its phase is constant. In the right view, the filter is addressed.
- This filter essentially comprises two layers, a first layer of BSO (Bismuth Silicone Oxide) and a second CL layer of smectic liquid crystals. These two layers are arranged between two conductive transparent layers of ITO (Indium Tin Oxide), one of which is connected to the electrical earth and the other at a constant voltage V 0 .
- the filter comprises a matrix of conductive electrodes whose voltages V are programmable. As can be seen in the right-hand view of FIG. 3, by addressing the electrodes with different voltages V-, 0 and V +, the crystal molecules take different orientations, causing different optical index variations and therefore variations. phase on the beams of light that pass through the dynamic filter.
- the optical system according to the invention overcomes these disadvantages. It is controlled by an external setpoint allowing to adapt either the image processing, or the phase filter, or both according to a given parameter.
- One of the features of the invention is to adapt the function for optimal filtering, based on information such as temperature, pressure, or the finite focus setting.
- the subject of the invention is an optical system comprising at least one optical objective, a photosensitive detector and an image processing unit, the optical objective comprising a coding filter. of a pupil, the image processing unit having the function of performing a digital filtering of the images coming from the photosensitive detector, characterized in that the processing unit comprises means arranged so as to process at least one instruction, the characteristics digital filtering applied to the image depending on said setpoint.
- the pupil coding filter is dynamic, that is to say that its phase or amplitude profile is adjustable by means of electrical commands, said phase or amplitude profile being controlled by the instruction.
- the image being composed of a plurality of adjacent zones
- the characteristics of the digital filtering applied to the image depend on the zone of the image.
- the setpoint is a value of the temperature or the pressure or the shooting distance or an optical parameter of the objective. If the objective is a zoom, said parameter is the value of the zoom focal length or the value of the opening of the zoom iris.
- the FTM, modulation transfer function and the spatial frequency filter depends on these different factors.
- the pupil coding filter comprises a phase correction and / or an amplitude correction, that is to say that it comprises zones with variable optical transmission, the correction distribution being called mask.
- the phase mask is:
- the variation of the phase is constituted by constant steps or is a rational power, a function of the distance at the center of the filter or is logarithmic, a function of the distance at the center of the filter or is exponential, a function of the distance at the center of the filter .
- the mask is: with a polynomial distribution, that is to say that the filter being referenced in a reference (x, y), the phase variation of the correction filter is a polynomial in x and in y;
- phase correction varies as exp [ia (x 3 + y 3 )], where i is the square root of -1, where a is a constant.
- the phase mask is semicircular.
- the image processing unit operates in real time.
- the invention also relates to the calibration method of the preceding optical system.
- Said method comprises at least one step of determining the characteristics of the pupil-coded filter or digital filtering associated with a predetermined setpoint, said characteristics being determined by digital simulation means and / or by optical test benches.
- FIG. 1 represents an optical objective comprising a phase filter
- FIG. 4 represents the block diagram of an optical system according to the invention.
- FIG. 4 represents a block diagram of an optical system S according to the invention. It corresponds to the area of the figure delimited by a dashed line. He understands :
- the optical objective Z comprises a pupil coding filter ⁇ .
- this optical lens Z is a zoom.
- the system according to the invention can be applied to other types of optics.
- the lens has a number of mechanical controls controllable by external controls. These devices consist essentially of linearly moving lenses or groups of lenses within the lens. These techniques are well known to those skilled in the art. These are basically the focus, aperture and focus controls.
- the pupil coded filter may be of amplitude or phase.
- the correction distribution or phase mask can be:
- the variation of the phase can be constituted of constant levels or be a rational power, function of the distance in the center of the filter or is logarithmic, function of the distance in the center of the filter or is exponential, function of the distance in the center of the filter.
- the phase mask can also be:
- the phase variation of the correction filter is a polynomial in x and in y;
- phase correction varies as exp [ia (x 3 + y 3 )], where i is the square root of -1, where a is a constant.
- phase mask can be semi-circular.
- the pupil coding filter ⁇ can also be a programmable dynamic liquid crystal filter.
- the photosensitive detector D generally consists of a matrix of photodetectors, of the CCD (Charge Coupled Device) type, for example.
- the optical lens-photosensitive detector assembly constitutes a camera. It can work in the visible or in the ultraviolet or infrared.
- the image processing unit UTI has three subsets E1, E2 and E3:
- a first subset E1 processes the instructions from external sources C.
- These sources may be sensors measuring a particular parameter of the camera environment such as the temperature (symbolized by a thermometer in FIG. 4) or the pressure ( symbolized by a manometer in Figure 4) or the user himself who can send, for example, a setpoint of focus, opening or focus distance.
- This first subset E1 essentially comprises a table of laws linking the input instructions to the different pupil-coding filters and / or the processing operations to be applied to the image. These law tables are pre-determined by calculation or by a calibration measurement in the factory. At a given instruction, therefore corresponds a filter and / or image processing to be applied to the optical system.
- each image processing can be dissociated into several units optimized by field areas;
- a second subset E2 controls the different lens adjusters and the pupil coded filter, if programmable, from the above information
- a third subset E3 digitally filters the images from the photosensitive detector according to the selected image processing and sends it to a display device DU.
- the landscape taken by the camera gives the best possible image, taking into account the performance of the objective and the environmental conditions for a given configuration, the opto-optical settings. mechanical, filtering and processing being optimized for this configuration.
- the operation of the system in a very wide temperature range for example greater than 100 degrees between the coldest temperature of use and the hottest temperature is from the following way.
- a temperature range is defined, it is known to calculate and / or measure thermal deflections induced by temperature changes as well as the maximum excursion range.
- the defocusing is due to changes in the refractive index of optical materials, changes in the radii of curvature and thickness of the various diopters due to expansion and expansions of mechanical wedges separating the different optical components.
- each increment is denoted by ⁇ ,, i varying from 1 to N.
- ⁇ a constant defocus ⁇ ( ⁇ ,) is associated.
- the best profile of the pupil-coded filter and the digital processing associated with the image are then determined. If the pupil coded filter is not
- the profile or profiles of the pupil-coded filter and the associated processing functions of the different thermal increments are stored in the first subset of the image processing unit.
- the temperature range ⁇ of operation of the optical objective is known by means of an external sensor. Therefore, the associated defocus ⁇ ( ⁇ ,) and the appropriate parameters to be applied to the objective and the image processing are also known.
- optical system can be used to maintain an image of very good quality whatever the environmental conditions or the optical parameters.
- This technique can also be used to simplify the optical combination of the objective and / or to eliminate a lens or a group of lenses or to lighten or even eliminate a lens translation mechanism dedicated to the compensation of thermal drifts.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Computer Vision & Pattern Recognition (AREA)
- Lenses (AREA)
- Studio Devices (AREA)
- Image Processing (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR1102210A FR2977962B1 (fr) | 2011-07-13 | 2011-07-13 | Systeme optique a codage de pupille asservi |
PCT/EP2012/063049 WO2013007576A1 (fr) | 2011-07-13 | 2012-07-04 | Systeme optique a codage de pupille asservi |
Publications (1)
Publication Number | Publication Date |
---|---|
EP2732616A1 true EP2732616A1 (fr) | 2014-05-21 |
Family
ID=46506361
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP12733679.0A Ceased EP2732616A1 (fr) | 2011-07-13 | 2012-07-04 | Systeme optique a codage de pupille asservi |
Country Status (5)
Country | Link |
---|---|
US (1) | US9285600B2 (fr) |
EP (1) | EP2732616A1 (fr) |
FR (1) | FR2977962B1 (fr) |
IL (1) | IL230425A (fr) |
WO (1) | WO2013007576A1 (fr) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR3034223B1 (fr) | 2015-03-24 | 2018-03-23 | In-Idt | Dispositif et procede pour l'acquisition biometrique de l'iris |
KR102128488B1 (ko) | 2015-12-09 | 2020-07-01 | 에이에스엠엘 홀딩 엔.브이. | 플렉시블 일루미네이터 |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6069738A (en) | 1998-05-27 | 2000-05-30 | University Technology Corporation | Apparatus and methods for extending depth of field in image projection systems |
US7180673B2 (en) * | 2003-03-28 | 2007-02-20 | Cdm Optics, Inc. | Mechanically-adjustable optical phase filters for modifying depth of field, aberration-tolerance, anti-aliasing in optical systems |
US7260251B2 (en) | 2003-03-31 | 2007-08-21 | Cdm Optics, Inc. | Systems and methods for minimizing aberrating effects in imaging systems |
JP4749332B2 (ja) | 2003-05-30 | 2011-08-17 | オムニビジョン テクノロジーズ, インコーポレイテッド | 拡大された焦点深度を有するリソグラフィックシステムおよび方法 |
EP1628495A1 (fr) * | 2004-08-17 | 2006-02-22 | Dialog Semiconductor GmbH | Traitement multiple d'une image pour accélérer le calcul pour cette image |
CN101288013B (zh) * | 2005-09-19 | 2010-12-08 | Cdm光学有限公司 | 基于任务的成像系统 |
KR101301448B1 (ko) * | 2006-03-06 | 2013-08-28 | 옴니비젼 씨디엠 옵틱스 인코퍼레이티드 | 줌렌즈 시스템 및 사용방식 |
EP2008242B1 (fr) * | 2006-04-03 | 2011-06-08 | OmniVision CDM Optics, Inc. | Systemes et methodes d'imagerie optique utilisant un traitement d'image non lineaire et/ou spatialement variable |
US7612805B2 (en) * | 2006-07-11 | 2009-11-03 | Neal Solomon | Digital imaging system and methods for selective image filtration |
FR2923028B1 (fr) * | 2007-10-26 | 2010-04-16 | Thales Sa | Dispositif d'imagerie a codage de pupille sub-longueur d'onde |
JP4618355B2 (ja) * | 2008-09-25 | 2011-01-26 | ソニー株式会社 | 画像処理装置及び画像処理方法 |
CN102549478B (zh) * | 2009-08-14 | 2016-02-24 | 爱克透镜国际公司 | 带有同时变量的像差校正的光学器件 |
JP5528173B2 (ja) * | 2010-03-31 | 2014-06-25 | キヤノン株式会社 | 画像処理装置、撮像装置および画像処理プログラム |
US8610813B2 (en) * | 2011-05-31 | 2013-12-17 | Omnivision Technologies, Inc. | System and method for extending depth of field in a lens system by use of color-dependent wavefront coding |
-
2011
- 2011-07-13 FR FR1102210A patent/FR2977962B1/fr not_active Expired - Fee Related
-
2012
- 2012-07-04 WO PCT/EP2012/063049 patent/WO2013007576A1/fr active Application Filing
- 2012-07-04 EP EP12733679.0A patent/EP2732616A1/fr not_active Ceased
- 2012-07-04 US US14/232,194 patent/US9285600B2/en not_active Expired - Fee Related
-
2014
- 2014-01-13 IL IL230425A patent/IL230425A/en active IP Right Grant
Non-Patent Citations (2)
Title |
---|
None * |
See also references of WO2013007576A1 * |
Also Published As
Publication number | Publication date |
---|---|
FR2977962A1 (fr) | 2013-01-18 |
US9285600B2 (en) | 2016-03-15 |
IL230425A (en) | 2017-11-30 |
US20140293097A1 (en) | 2014-10-02 |
WO2013007576A1 (fr) | 2013-01-17 |
FR2977962B1 (fr) | 2013-07-26 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
EP1386480B1 (fr) | Procede de capture et d'affichage d'une image panoramique numerique a resolution variable | |
EP2697677B1 (fr) | Systeme d'imagerie comprenant une lentille de fresnel | |
FR2881231A1 (fr) | Systeme d'objectif zoom et appareil photographique ayant un tel systeme d'objectif zoom | |
CA2687809C (fr) | Camera infrarouge comportant un zoom optique de grand rapport et procede correspondant d'observation d'une scene | |
EP2248338A1 (fr) | Dispositif optique mixte d'imagerie multi-focale et de calibration ir | |
EP2929310A1 (fr) | Dispositif de mesure et de controle du front d'onde d'un faisceau lumineux coherent | |
FR2575838A1 (fr) | Objectif a distance focale variable | |
WO2009019364A2 (fr) | Système optique muni d'un dispositif d'accroissement de sa profondeur de champ | |
FR2881520A1 (fr) | Obtention d'une image de phase a partir d'une image d'intensite | |
EP3237860B1 (fr) | Systeme d'imagerie grand champ infrarouge | |
EP0200623A1 (fr) | Installation de radiologie | |
FR3064355A1 (fr) | Spectrometre a transformee de fourier et son procede de gestion | |
EP2732616A1 (fr) | Systeme optique a codage de pupille asservi | |
EP2198337A2 (fr) | Systeme d'imagerie a modification de front d'onde et procede d'augmentation de la profondeur de champ d'un systeme d'imagerie | |
WO2005069605A1 (fr) | Equipement, procede et accessoire anti-eblouissement, systeme d’imagerie à dynamique lumineuse augmentee | |
EP2520916A1 (fr) | Télescope multispectral à balayage comportant des moyens d'analyse de front d'onde | |
EP2840430B1 (fr) | Système de prise de vues stéréoscopique compact | |
EP3526638A2 (fr) | Procede d'optimisation d'une architecture d'objectif infrarouge achromatisee corrigee des derives thermiques et systeme de captation d'image associe | |
FR2930049A1 (fr) | Objectif a athermalisation passive. | |
EP4070139A1 (fr) | Systeme d'optique adaptative a temps de reponse ameliore, utilisation et procede afferents | |
FR2910134A1 (fr) | Systeme d'imagerie ir2-ir3 bi-champ compact | |
FR2999300A1 (fr) | Systeme optique comportant un filtre optique a masque de phase et/ou d'amplitude a motif periodique | |
FR2973892A1 (fr) | Systeme de conduite infrarouge stereoscopique a profondeur de champ augmentee | |
EP3899458A1 (fr) | Instrument a plusieurs voies optiques | |
EP1215895A1 (fr) | Détecteur de lumière à correction synchrone de non-uniformité |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
17P | Request for examination filed |
Effective date: 20140109 |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
DAX | Request for extension of the european patent (deleted) | ||
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: EXAMINATION IS IN PROGRESS |
|
17Q | First examination report despatched |
Effective date: 20181213 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: EXAMINATION IS IN PROGRESS |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R003 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED |
|
18R | Application refused |
Effective date: 20210307 |
|
P01 | Opt-out of the competence of the unified patent court (upc) registered |
Effective date: 20230529 |