KR100715033B1 - Content-based fused off-axis illumination direct-to-digital holography - Google Patents

Abstract

Systems and apparatus for content-based fusion incidence illumination direct-to-digital holographic are described. The method includes calculating an illumination angle for an optical axis defined by a focusing lens based on data representing a spatially heterodysed hologram analyzed by Fourier; Recording a content based spatial heterodyne hologram containing spatial heterodyne fringes for Fourier analysis; Place on top of the heterodyne carrier frequency defined by the angle between the reference beam and the object beam by transforming the axes of the recorded content-based spatial heterodyne hologram containing the spatial heterodyne fringe in Fourier space. Fourier analyzing the recorded content-based spatial heterodyne hologram comprising a spatial heterodyne fringe; Applying a digital filter to block signals near the original origin; And performing an inverse Fourier transform.

Description

CONTENT-BASED FUSED OFF-AXIS ILLUMINATION DIRECT-TO-DIGITAL HOLOGRAPHY}

The present invention generally relates to direct-to-digital holography (interference). The present invention relates in more detail to content-based incidence illumination for direct-to-digital holography.

Conventional direct-to-digital holography (DDH) is also referred to as direct-to-digital interferometry and is already known in the art. For example, FIG. 1 shows a simple example of a DDH system. Light generated from the laser light source 105 is expanded through a beam expander / spatial filter 110 and then passes through the lens 115. The filtered extension beam is then passed to beamsplitter 120. The beam splitter 120 may be partially reflective. Some of the light reflected by the beam splitter 120 constitutes an object beam 125 that is transmitted to an object 130. A portion of the object beam 125 is reflected by the object 130 and passes through the beam splitter 120 to move to the focusing lens 145. The light then passes through the focusing lens 145 to reach a charge coupled device (CCD) camera (not shown).

Some of the light from the lens 115 passing through the beam splitter 120 constitutes a reference beam 135. The reference beam 135 is reflected at a small angle from the mirror 140. The reference beam 135 reflected from the mirror is directed to the beam splitter 120. The reference beam 135 reflected by the beam splitter 120 passes through the focusing lens 145 and then reaches a charge coupled device (CCD) camera (not shown). The object beam 125 and the reference beam 135 from the focusing lens 145 form a plurality of objects and reference waves 150 and interfere in a CCD to interfere with the hologram as known in US Pat. No. 6,078,392. Characteristics.

In FIG. 1 the object beam 125 is parallel and coincident with the optical axis 127. This type of DDH structure can be referred to as on-axis illumination. In this approach, the limitation was that the imaging resolution of the DDH system was limited by the optical properties of the system. The most noticeable limitation of the optical properties is the aperture stop required to prevent image quality degradation due to aberrations. For the two-dimensional Fourier plane, only the object space frequencies inside the circle with radius q0 can pass. In the case of orthogonal illumination, the aperture with radius q0 appears to be centered at the zero spatial frequency ( q = 0) . Therefore, there is a need for a method capable of transmitting spatial frequencies outside the circle with a radius q0 .

There is a need for the following aspects of the invention. Of course, the invention is not limited to this aspect.

According to one aspect of the present invention, the process includes: calculating an illumination angle for an optical axis defined by a focusing lens based on data representative of a Fourier analyzed spatial heterodyne hologram; Digitally recording the content based Incident Illumination spatial heterodyne hologram comprising spatial heterodyne fringes for Fourier analysis; Transforming the axes of the recorded content-based Incident Illumination Heterodyne Hologram containing the spatial heterodyne fringes in Fourier space and placing them on top of the heterodyne carrier frequency defined as the angle between the reference beam and the object beam. Fourier analyzing the recorded content-based Incident Illumination spatial heterodyne hologram comprising spatial heterodyne fringes; Applying a digital filter to block signals of original origin attention; And performing an inverse Fourier transform.

According to another aspect of the invention, an apparatus comprises: an interferometer comprising a focusing lens for recording a content-based spatial heterodyne hologram comprising spatial heterodyne fringes for Fourier interpretation; A digital recorder coupled to the interferometer; Computer for calculating an illumination angle with respect to an optical axis defined by the focusing lens based on data representing a spatial heterodyne hologram analyzed by Fourier.

These and other features of the present invention will be better understood with reference to the following detailed description and the accompanying drawings. However, the following detailed description sets forth various specific embodiments of the present invention, but is for the purpose of understanding and is not intended to limit the present invention. Many substitutions, changes, additions, and / or reconfigurations are possible without departing from the spirit of the invention, and the invention includes such substitutions, changes, additions, and / or reconfigurations.

The drawings included in and constituting part of the specification are included to illustrate features of the present invention. The more clear concept of the present invention, the concept of the components and operation of the system presented in the present invention will become clearer by referring to the exemplary embodiment shown in the drawings. Like reference numerals denote like elements. The invention may be better understood with reference to the drawings and detailed description. It should be appreciated that the components shown in the figures are not necessarily drawn to scale.

1 is a schematic diagram of a conventional direct-to-digital holography apparatus.

2 is a schematic diagram of an incidence illumination direct-to-digital holography device (interferometer) in an incidence state as one embodiment of the present invention.

FIG. 3 is a schematic diagram of the incidence illumination direct-to-digital holography device (interferometer) of FIG. 2 in an incidence state. FIG.

4 is a process flow diagram performed by a computer program representing an embodiment of the present invention.

Various features and advantages of the present invention will be described in more detail with reference to the accompanying drawings and non-limiting embodiments described in detail below. Well-known starting materials, process techniques, apparatuses or equipment are omitted for clarity of explanation. However, the following detailed description and specific examples are presented for the purpose of describing the preferred embodiments of the invention and are not intended to limit the invention. Those skilled in the art will be able to make various substitutions, modifications, additions and / or rearrangements, etc. within the scope of the technical idea of the present invention from the description.

In this specification, various documents are cited with Arabic numerals in parentheses. The titles of these documents will be given prior to the claims at the end of the specification under the heading Reference. These documents are incorporated by reference for the purpose of demonstrating the background and prior art of the present invention in its entirety.

The invention includes acquiring, storing and / or playing digital data. The present invention involves processing digital data representing an image. The invention also includes converting data from multiple images to composite images.

The present invention includes a method for obtaining holographic images with improved resolution from a direct-to-digital holography system using incidence illumination. The invention also includes an apparatus for obtaining a holographic image with improved resolution using a direct-to-digital holography (DDH) system using incidence illumination.

The object to be observed (imaged) is optically coupled to the light source via one or more optical elements. As described in FIG. 1, the illumination beam typically penetrates the center of the target objective lens (ie, the lens system) along and parallel to the optical axis. This type of DDH structure can be referred to as 'orthogonal illumination', and can obtain the spatial frequency q of an object up to a specific value q0 determined by the objective aperture.

The present invention includes a 'incident illumination' scheme where the light source moves laterally away from the center of the objective lens but still passes parallel to the optical axis. The illumination is incident on the object at an angle to the optical axis due to the focusing effect of the objective lens. Such incidence illumination allows the higher spatial frequency ( q > q0 ) of the object to penetrate the objective aperture than in orthogonal illumination and thus can be observed. This is an important advantage of the present invention.

 The present invention includes an extended DDH system (apparatus) digitally configured to digitally capture an incidence illumination and one or more incidence illumination holograms of the same object. The invention also includes a method of analyzing and / or processing (fusing) digitally captured data. As a result, the fused image will contain a wider range of spatial frequencies than any of the original holograms, resulting in a nominal image resolution of the system as compared to the case where no incident illumination data is available. Significantly improved.

As mentioned above, the image resolution of a basic DDH system is limited by the properties of the optics, in particular by the aperture stop required to prevent degradation of the image quality due to aberrations. This means that due to the optical properties of the DDH system, only object space frequencies in a circle with radius q0 can be passed through. In orthogonal illumination, the aperture with radius q0 appears to be centered at the zero spatial frequency ( q = 0 ). In the case of incidence illumination the aperture with radius q0 appears to be shifted in the frequency domain (eg to the left). This means that a spatial frequency with q> q0 is passed in the direction of the aperture travel. On the other hand, the spatial frequency of q close to q0 in the opposite direction is 'lost'. By acquiring the second image of the illumination moved in the opposite direction, the aperture can be shifted (eg to the right), so that the spatial frequency 'lost' in the first image is restored to an additional frequency of q0 or higher. The information is fused from the two images to obtain one image having further improved resolution. Since DDH records phase information in complex image waveforms, it is possible to obtain very advantageous results by fusing information from two (or more) images. The present invention improves the resolution of general object structures regardless of orientation.

The present invention includes the extension of a basic DDH system that automatically captures both incidence and incidence illumination holograms. The present invention also includes a method of analyzing and fusing the results of these holograms to display the observed object with better spatial resolution than conventional DDH techniques.

As shown in FIG. 1, the object beam 125 is parallel to the optical axis 127. As described above, such a structure may be referred to as orthogonal illumination. In contrast, incidence illumination is applied when the object beam 125 is inclined at an angle with respect to the optical axis 127 (at a predetermined angle) and enters the object 130 (for example, the object beam 215 described with reference to FIG. 3). 305)). There are many ways to obtain Incident Lighting; The method presented below is merely to show a representative example, and thus the present invention is not limited to the following examples.

2 and 3, an example of an incident light DDH device is shown. In Figures 2 and 3 there are two significant changes compared to Figure 1. The first change is that the laser light source 105, the beam expander / spatial filter 110, and the lens 115 are grouped into a computer controlled moveable enclosure 205. The enclosure 205 is movable along an axis substantially parallel to the optical axis 127. In more detail, the enclosure 205 is movable along an axis substantially coplanar with a plane perpendicular to the beamsplitter 120.

2 and 3, the second modification is the addition of the objective lens 210. In FIG. 2, the laser light source encapsulation 205 is positioned such that the object beam 125 reflected from the beam splitter 120 passes through the center of the objective lens 210. The object beam 125 then leaves the objective lens 210 and enters the object 130, the center of which is at the optical axis 127. In this structure, the normal incidence illumination is obtained, and the system of FIG. 2 is effectively the same as the system of FIG.

However, in FIG. 3, the laser light source encapsulation 205 moves (up) so that the object beam 125 passes out of the center of the objective lens. Of course, the laser light source enclosure 205 may move downward. Because of the focusing characteristic of the objective lens 210, the object beam 215 leaves the objective lens 210 and is inclined at an angle with respect to the optical axis 127 to be incident on the object 130 to obtain incidence illumination. Therefore, the object beam 215 may be incident on the object 130 so as not to be substantially parallel to the optical axis 127. The object beam 305 reflected from the object again penetrates off-axis through the objective lens 215 but is still focused on a CCD (not shown) because of the optical properties of the objective lens 210 and the focusing lens 150. In the case of the incidence illumination, the diffraction characteristic includes the spatial frequency of the object that is not observed when the hologram formed in the CCD by the interference between the object beam 305 and the reference beam 135 uses the incidence illumination Imply.

Accordingly, an apparatus for digitally recording a spatial heterodyne hologram comprising a spatial heterodyne fringe for Fourier analysis in accordance with the present invention comprises a laser; A beam splitter optically coupled to the laser; A reference beam mirror optically coupled to the beamsplitter; An object optically coupled to the beamsplitter; A focusing lens coupled to both the reference beam mirror and the object; A digital recorder optically coupled to the focusing lens; And a computer that performs a Fourier transform, provides a digital filter, and performs an Inverse Fourier transform, wherein the reference beam is incident at an angle that is not perpendicular to the reference beam mirror, and an object beam is defined by the focusing lens. The reference beam and the object beam which are inclined at an angle with respect to the optical axis to be incident on the object, and constitute a plurality of simultaneous reference waves and object waves, are focused on the focal plane of the digital recorder by the focusing lens, Forming a spatial heterodyne hologram comprising a spatial heterodyne fringe for Fourier analysis recorded by the computer, and the computer transforms the axes of the recorded spatial heterodyne hologram comprising a spatial heterodyne fringe in Fourier space to Beams and objects Located on top of the heterodyne carrier frequency defined by an angle between and and cleaves the original home position (origin) of the ambient signal before performing the inverse Fourier transform. The apparatus may comprise an objective lens optically coupled between the beamsplitter and the object. The apparatus may comprise an aperture stop coupled between the object and the focusing lens. The beam splitter, the reference beam mirror, and the digital recorder may define Michelson geometry. The beam splitter, the reference beam mirror, and the digital recorder may define Mach-Zehner geometry. The apparatus may also include a digital storage medium coupled to the computer to perform a Fourier transform, provide a digital filter, and perform an Inverse Fourier transform. The digital recorder may include a CCD camera 350 defining a pixel. The apparatus may include a beam expander / spatial filter 230 optically coupled between the laser and the beam splitter. The angle between the reference beam and the object beam and the magnification provided by the focusing lens decompose features of the spatial heterodyne hologram that the digital recorder includes spatial heterodyne fringes for Fourier analysis. to be resolved). In order for the digital recorder to resolve one feature, two fringes with two pixels per fringe may be provided. The present invention includes a spatial heterodyne hologram provided by the above-described apparatus, which is implemented in a computer readable medium.

Accordingly, according to the present invention, a spatial heterodyne hologram recording method including a spatial heterodyne fringe for Fourier analysis includes: dividing a laser beam into a reference beam and an object beam; Reflecting the reference beam at an angle that is not perpendicular to the reference mirror; Reflecting the object beam from an object at an angle to the optical axis defined by a focusing lens; Focusing a reference beam and an object beam constituting a plurality of simultaneous reference and object waves with a focusing lens in the focal plane of the digital recorder to form a spatial heterodyne hologram comprising a spatial heterodyne fringe for Fourier analysis; Digitally recording a spatial heterodyne hologram comprising a spatial heterodyne fringe for the Fourier analysis; Convert the axis of the recorded spatial heterodyne hologram containing the spatial heterodyne fringe in Fourier space to be at the top of the heterodyne carrier frequency defined by the angle between the reference beam and the object beam; Remove the signal around the original origin using a digital filter; And Fourier analyzing the recorded spatial heterodyne hologram comprising the spatial heterodyne fringe by performing an inverse Fourier transform. The method includes a method for reflecting the object beam from the object, and after reflecting the object beam from the object at an angle to the optical axis defined by the focusing lens, on the light side defined by the focusing lens. And refracting the object beam with the objective lens to be inclined at an angle with respect to the object lens. Converting the axis of the recorded spatial heterodyne hologram may comprise converting to an extended Fourier transform. Recording digitally may include sensing the beam with a CCD camera defining a pixel. Incidental illumination spatial heterodyne holograms may be Incidental illumination spatial low frequency heterodyne holograms; Phrase low-frequency implies that the underlying fringe spatial frequency is below the Nyquist sampling limit. The method may also include storing the spatial heterodyne hologram including the spatial heterodyne fringe for Fourier analysis as digital data. The method may comprise regenerating the Fourier analyzed spatial heterodyne hologram. The method may also include transmitting the Fourier analyzed spatial heterodyne hologram. The present invention may include a spatial heterodyne hologram obtained by the above-described method, implemented in a computer readable medium.

Content based fusion

In order to use incidence illumination, such specific imaging parameters such as the incidence illumination angle and direction must be set. However, there is no set of optimal imaging parameters for all objects or for all parts of the same object. Lighting "across" valleys or trenches in an object may degrade valuable height information or cause all to be lost. After all, what is needed is a method of selecting and / or optimizing incidence illumination parameters for the object of interest.

The present invention may include a method for improving holographic imaging of DDH systems using incidence illumination. This method can be implemented in software. The method may include selecting incidence illumination parameters according to the content of the object being observed. This method can improve both spatial and height resolution of a direct-to-digital holography (DDH) imaging system using incidence illumination, in a manner dependent on the content of a given object of interest. . Improved resolution is achieved by digitally processing multiple critically selected holograms of a given object captured under varying illumination angles. As a result, the invention can satisfy the requirement that the incidence illumination parameters be determined by the content of the observed object.

The selection of incidence illumination parameters may be iterative. Additional incident illumination images may be fused into the composite image. Additional (incident) illumination images can be collected and fused into a composite image as one set or sets at a time.

The choice of incidence illumination parameters may be genetic. Multiple composite images can be collected and compared. Between two or more composite images, one or more illumination parameters used to obtain the fused image with the best resolution are guide points (eg, endpoints) for further optimization of the parameters in subsequent iterations. Can be used as. Alternatively, between two or more composite images, one or more illumination parameters used to obtain the composite image with the worst resolution may be avoided in subsequent iterations.

This method may include the following procedure. A holographic imaging system with computer controlled object illumination can form a hologram of the viewing object. The digital representation of the hologram is transmitted to the computer and the digital representation of the object wave (eg the image) is reconstructed and stored. Features of interest can be identified by automatic processing or by a user. Guidance for the features of interest may be provided by data indicative of changes in amplitude and / or phase across two or more adjacent pixels. A steep change in amplitude and / or phase across two or more adjacent pixels highly expresses the feature of interest.

A composite image with improved resolution can be calculated by compositing the current image with one or more previous images. The composite image and the features of interest are analyzed; The result of this analysis may end the process or provide new imaging control parameters. These control parameters indicative of the subsequent angle of illumination to capture the new image can be passed to the holographic imaging system. This process can be repeated. In this way, the present invention can improve holographic imaging capabilities by allowing incidence illumination to be adapted to the properties of the viewing object.

4, the present invention is overview. The physical components of the present invention may include an object 1, an Incident Illumination Direct to Holography (DDH) system 3, and a computer, display and / or additional analyzer 15 for display. have. The remainder of the invention may include software. The object of interest 1 is imaged by the incident illumination DDH system 3. The incident illumination DDH system 3 may be the system shown in FIGS. 2 and 3.

Referring again to FIG. 4, the output of the DDH system 3 is a digital hologram 2 delivered to the composite image reconstruction 5 stage in which the composite digital image of the observation object is calculated. In one embodiment, the composite image reconstruction 5 stage may use Fourier domain image reconstruction, which is now known to those skilled in the art. While the phase of the composite digital image 4 represents the height of the object 1, the amplitude of the composite digital image 4 represents the reflectivity of the object 1.

Referring to FIG. 4, the composite digital image 4 is passed to both the image storage 7 and the feature selection 9 stage. The image storage 7 is collected into one or more image set (s) 14 of all the images captured for the object 1. In order to form a composite image, the image store 7 passes one or more image set (s) 14 and associated parameters 12 to the fusion algorithm 13. The fusion algorithm 13 uses a high value of one or more of the transmitted image set (s) 14 together with all or some associated image control parameters 12 used to capture images in the set (s). Compute the resolution, composite fusion images 16.

Referring again to FIG. 4, the fused image 16 may be delivered to the imaging parameter selection 11 stage and to the display, storage, and / or additional analyzer 15. The feature selection 9 stage acquires the composite digital image 4 and user input or automatic feature identification 6 as input. The purpose of the feature selection 9 stage is to identify the feature or feature (s) of the observation object 1. Such features may be identified by a graphical user interface or automatic image processing. The feature selection (9) section conveys the feature parameters (8) to the imaging parameter selection (11) stage. The imaging parameter selection 11 stage accepts the feature parameter 8 and the currently fused image 16 as input. By analyzing the currently fused image 16 in relation to the feature parameter 8, the imaging parameter selection 11 stage will stop processing-if the fused image is deemed good enough-or imaging control parameters. It may be determined whether to output a new set of fields 12. The new imaging control parameter 12 instructs the DDH system 12 to capture a new hologram using the incidence illumination angle specified by the imaging control parameters 12. Once the new digital hologram 2 is captured, the process is repeated until the imaging parameter selection 11 stage determines that processing should be stopped.

One of the embodiments described above is a computer controlled, moveable enclosure as a structure that performs the function of aligning the illumination source, beam expander / spatial filter and lens such that the object beam passes through or off center of the objective lens. Although the structure of aligning the source, the beam expander / spatial filter and the lens is any structure capable of performing the function of aligning the object beam such that the object beam passes through or out of the center of the objective lens. By way of example, a fraudulent source, a beam cremator / spatial filter, a movable platform capable of displacing the beam splitter, mirror, objective, object, focusing lens, CCD camera relative to a lens, or a series of other examples Moveable optical elements (eg, mirrors), and other examples are flexible optical fibers and / or cables.

In the terms used in the present invention, those referred to in the singular are defined as meaning one or more. As used herein, the plural referents are defined as meaning two or more. In the terms used in the present invention, those mentioned as 'other' are defined as meaning 'secondary' or more. In the terminology used herein, 'comprising and / or having' is defined as meaning 'comprising: open language'. In the terminology used herein, 'bond' is defined as meaning 'connecting', although not directly and not necessarily mechanical. In the term used herein, 'approximately' means at least a value close to a given value (eg, preferably within 10%, more preferably within 1%, most preferably within 0.1%). It is defined as. In the terminology used herein, 'substantially' is defined as meaning largely but not necessarily whole. In the terminology used herein, 'general' is defined to mean at least approaching a given state. In the terminology used herein, 'deploying' is defined as meaning design, construction, shipping, installation and / or operation. In the terminology used herein, 'means' is defined as meaning hardware, firmware and / or software for obtaining results. In the terminology used herein, a program or computer program is defined as meaning a series of instructions designed to be executed on a computer system. Programs or computer programs include subroutines, functions, procedures, object methods, object implementations, executable applications, applets, source code ( source code, object code, shared library / dynamic load library, and / or a series of instructions designed to be executed on other computers or computer systems. In the terminology used herein, low-frequency is defined to imply that the fundamental fringe spatial frequency is below the Nyquist sampling limit.

Practical application of the present invention

A practical application of the technical value of the present invention is in the field of measurement. The present invention is useful in connection with microelectronic (mechanical) manufacturing, such as semiconductor inspection. The present invention is also useful in connection with nanotechnology research, development and manufacture, such as nanovisualization, nanomeasurement, and the like. The present invention is useful in connection with interferometers such as digital processing and / or digital data acquisition, for example direct-to-digital holography instruments based on electronic holography. Although not all can be mentioned in detail, the present invention has a myriad of uses.

Advantage of the present invention

The method, apparatus and / or computer program representing an embodiment of the present invention may be advantageous for cost savings and at least for the following reasons. The present invention provides for the identification of features of interest in the observation object either automatically or by user input via a graphical user environment. The invention provides control of the holographic imaging system based on the identified features to provide content based resolution improvement. The invention analyzes the current fusion image to determine whether processing should be stopped or whether the best imaging parameters should be calculated to capture a new hologram. Computer control of the object illumination of the invention can be provided. The fusion of results from multiple holograms of the present invention can be provided. The invention can provide significantly increased imaging resolution. The invention may improve quality and / or reduce costs over previous approaches.

All embodiments of the present invention presented above can be carried out and used without undue experimentation in light of the description. The present invention is not limited by the theoretical references cited herein. While the best embodiments for implementing the present invention have been considered by the inventors, the practical application of the present invention is not limited thereto. Thus, it will be apparent to one skilled in the art that the present invention may be practiced otherwise than as specifically described herein.

In addition, the individual components may be combined not only in accordance with the above-described structure, but also in all possible structures. In addition, there may be variations in the steps or series of steps described above. In addition, the devices described above may be individual modules, but may be incorporated into related systems. In addition, all elements and features mentioned in each embodiment may be merged or replaced with elements and features mentioned in other embodiments unless such elements and features are mutually exclusive.

Various substitutions, changes, additions and / or reconfigurations of the present invention are possible without departing from the scope of the spirit of the present invention. The technical spirit and equivalents defined by the following claims encompass all such substitutions, changes, additions, and / or reconfigurations.

The following claims are intended to cover function-plus-function limitations unless the limitations are expressly stated in the claims as '(functional) means' and / or '(functional) steps'. It should not be construed as including. Embodiments of the sub-concepts of the invention are embodied by the dependent claims of the claims and their equivalents. Particular embodiments of the invention are distinguished by the dependent claims and their equivalents of the claims.

Reference

(1) Goodman, Joseph W., "Introduction to Fourier Optics", McGraw-Hill, 1998.

(20) Voelkl, E. et al., "Introduction to Electron Holography", Kluwer Acdemics / Plenum Publisher, 1999.

(3) Eugene Hecht, "Optics, Third Edition", Addison-Wesley, 1998, page 465-469; 599-602.

Claims (27)

A method of recording a content-based Incident Illumination Spatial Heterodyne Hologram comprising spatial Heterodyne fringes for Fourier analysis: Calculating an illumination angle with respect to an optical axis defined by the focusing lens, based on the data representing the spatial heterodyne hologram analyzed by Fourier; Reflecting the reference beam from the reference mirror at a non-vertical angle; Reflecting an object beam from an object, wherein the object beam is incident on the object at the illumination angle; Focusing the reference beam and the object beam on a focal plane of a digital recorder to form a content-based incidence illumination spatial heterodyne hologram comprising spatial heterodyne fringes for the Fourier analysis; And And digitally recording a content-based incidence illumination spatial heterodyne hologram comprising spatial heterodyne fringes for Fourier analysis. The method of claim 1, The recording is accomplished by transforming the axes of a content-based Incident Illumination Heterodyne Hologram containing the recorded spatial heterodyne fringes in Fourier space and placing them on top of a heterodyne carrier frequency defined as the angle between the reference beam and the object beam. Fourier analysis of the content-based Incident Illumination Spatial Heterodyne Hologram comprising the spatial Heterodyne fringes; Applying a digital filter to block signals of original origin attention; And And performing an inverse Fourier transform. 2. The hologram recording of claim 1, further comprising fusing the Fourier analyzed content based Incident Illumination spatial heterodyne hologram with at least one Fourier analyzed spatial heterodyne hologram to produce a single composite image. Way. 4. The hologram recording method of claim 3, wherein the Fourier analyzed spatial heterodyne hologram comprises a composite image. 4. The hologram recording method of claim 3, further comprising reproducing the single composite image. 4. The hologram recording method of claim 3, further comprising transmitting the single composite image. The method of claim 1, wherein calculating an illumination angle for an optical axis defined by a focusing lens is based on data representative of the Fourier analyzed spatial heterodyne hologram, selecting the feature of interest from the Fourier analyzed spatial heterodyne hologram. And a holographic recording method comprising the steps of: 8. The method of claim 7, wherein said digitally recording comprises detecting the beams with a CCD camera defining pixels. 10. The method of claim 8, wherein the feature of interest is defined by data indicating a change in at least one of amplitude and phase over at least two pixels. 2. The method of claim 1, further comprising determining whether to record additional content-based spatial heterodyne holograms. 11. The hologram recording method of claim 10, further comprising recording the additional content-based spatial heterodyne hologram. The method of claim 11, By transforming the axes of the content-based Incident Illumination Heterodyne Hologram containing the recorded additional spatial heterodyne fringes in Fourier space and placing them on top of the heterodyne carrier frequency defined as the angle between the reference beam and the object beam. Fourier analyzing the content-based Incident Illumination Spatial Heterodyne Hologram comprising the recorded additional Spatial Heterodyne Fringes; Applying a digital filter to block signals of original origin attention; And And performing an inverse Fourier transform. 13. The method of claim 12, further comprising fusing the Fourier analyzed additional content-based incidence illumination spatial heterodyne hologram with at least one Fourier analyzed spatial heterodyne hologram to generate a single composite image. Hologram recording method. 2. The method of claim 1, further comprising storing the content-based spatial heterodyne hologram including spatial heterodyne fringes for Fourier analysis as digital data. delete delete A device for digitally recording a content-based Incident Illumination spatial heterodyne hologram comprising spatial heterodyne fringes for Fourier analysis: An illumination source; A beam splitter optically coupled to the illumination source; A reference beam mirror optically coupled to the beamsplitter; A focusing lens; A digital recorder coupled to the focusing lens; And A computer that controls the angle of illumination for the optical axis defined by the focusing lens, performs a Fourier transform, applies a digital filter, and performs an inverse Fourier transform based on data representing the spatial heterodyne hologram analyzed by Fourier Including, Here, a reference beam is incident on the reference beam mirror at a non-vertical angle, an object beam is incident on the object at the illumination angle with respect to an optical axis defined by a focusing lens, and the reference beam and the object beam are directed to the focusing lens. Thereby focusing on the focal plane of the digital recorder to form a content-based Incident Illumination spatial heterodyne hologram comprising spatial heterodyne fringes for the Fourier analysis recorded by the digital recorder, and the computer is configured to Transform the axes of the incidence illumination spatial heterodyne hologram including recorded spatial heterodyne fringes to be located on top of the heterodyne carrier frequency defined by the angle between the reference beam and the object beam and perform the inverse Fourier transform Seen before Apparatus for recording a content based on four incident illumination spatially heterodyne hologram, characterized in that blocking signals around the origin digitally. 18. The apparatus of claim 17, further comprising an objective lens optically coupled between the beamsplitter and the object. 18. The apparatus of claim 17, wherein the illumination source comprises a laser. 18. The apparatus of claim 17, wherein the digital recorder comprises a CCD camera defining pixels. 18. The method of claim 17, wherein the angle between the reference beam and the object beam is such that the digital recorder can resolve features of an incidence illumination spatial heterodyne hologram comprising spatial heterodyne fringes for the Fourier analysis. And a magnification by the focusing lens is selected, and two fringes are provided, each having two pixels, wherein the content-based incidence illumination spatial heterodyne hologram is digitally recorded. 18. The apparatus of claim 17, wherein the illumination source is movable relative to the beamsplitter. 18. The apparatus of claim 17, wherein the beamsplitter, the reference beam mirror, and the digital recorder define Michelson geometry. . 18. The method of claim 17, wherein the beamsplitter, the reference beam mirror, and the digital recorder digitally record a content-based incidence illumination spatial heterodyne hologram, characterized by Mach-Zehner geometry. Device. 18. The method of claim 17, further comprising a digital storage medium coupled to a computer to perform the Fourier transform, apply a digital filter, and perform an Inverse Fourier transform. Device for recording in a manner. 18. The method of claim 17, wherein the computer calculates the illumination angle for the optical axis defined by the focusing lens based on data representing the spatial heterodyne hologram analyzed by the Fourier analysis. A device for digitally recording a spatial heterodyne hologram. delete

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