WO2018207613A1 - Système d'imagerie et procédé d'imagerie - Google Patents

Système d'imagerie et procédé d'imagerie Download PDF

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Publication number
WO2018207613A1
WO2018207613A1 PCT/JP2018/016594 JP2018016594W WO2018207613A1 WO 2018207613 A1 WO2018207613 A1 WO 2018207613A1 JP 2018016594 W JP2018016594 W JP 2018016594W WO 2018207613 A1 WO2018207613 A1 WO 2018207613A1
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Prior art keywords
image
imaging
volume hologram
optical element
optical information
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PCT/JP2018/016594
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English (en)
Japanese (ja)
Inventor
友哉 中村
山口　雅浩
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国立大学法人東京工業大学
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Priority to JP2019517552A priority Critical patent/JPWO2018207613A1/ja
Publication of WO2018207613A1 publication Critical patent/WO2018207613A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
    • H04N23/95—Computational photography systems, e.g. light-field imaging systems
    • H04N23/955—Computational photography systems, e.g. light-field imaging systems for lensless imaging
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/12—Generating the spectrum; Monochromators
    • G01J3/18—Generating the spectrum; Monochromators using diffraction elements, e.g. grating
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
    • G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
    • G01J3/28—Investigating the spectrum
    • G01J3/40—Measuring the intensity of spectral lines by determining density of a photograph of the spectrum; Spectrography
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/32—Holograms used as optical elements
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B11/00—Filters or other obturators specially adapted for photographic purposes
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B15/00—Special procedures for taking photographs; Apparatus therefor
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • 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

Definitions

  • the present invention relates to an imaging system and an imaging method for imaging an imaging target including a plurality of optical information with high resolution.
  • Patent Document 1 discloses an imaging apparatus that can acquire high-resolution image information by a sensor array method.
  • Patent Document 2 discloses an imaging apparatus that can acquire a high-resolution image by a mechanical scanning method.
  • Patent Document 3 describes that multi-wavelength imaging is collectively encoded with a single element by a system design that combines an encoding optical element and image restoration processing (compressed sensing). An imaging technique to be realized is disclosed.
  • the mechanical scanning method can reduce the size of the device while increasing the resolution of video recording, but the optical system becomes complicated and the number of times of shooting is required, so the shooting time is long. It becomes a problem to become.
  • the video recording has a wide angle, multi-wavelength, and high resolution with a simple configuration via a single element. It is preferable to realize resolution. That is, it is required to realize high resolution of video recording with a large amount of information with a downsized apparatus through a single optical element that collectively encodes image information of a plurality of fields of view and wavelengths independently.
  • the present invention has been made in view of the above problems, and can realize a wide angle, a multi-wavelength, and a high resolution of video recording after downsizing the apparatus with a simple configuration via a single element. It is an object of the present invention to provide a new and improved imaging system and imaging method that are possible.
  • One aspect of the present invention is an imaging system for imaging an imaging target including a plurality of optical information, the volume hologram optical element encoding the imaging target after dividing the imaging target for each optical information, and the volume hologram optical element
  • An image sensor that multiplexes each encoded image encoded in step S1 to acquire a multiplexed image, and performs image restoration processing on the multiplexed image acquired by the image sensor by compressed sensing to obtain imaging data of the imaging target.
  • an image processing unit that performs separation and reconstruction.
  • each optical information included in the imaging target can be divided and encoded independently for each optical information. For this reason, after acquiring a multiplexed image of each optical information with an image sensor, the image processing unit separates and reconstructs the multiplexed image, and efficiently widens the video recording with a simple configuration, increases the wavelength, High resolution can be realized.
  • the volume hologram optical element divides the plurality of optical information included in the imaging target for each angle with the volume hologram element or for each wavelength width of the optical information. It is good also as encoding.
  • the volume hologram optical element can be divided and encoded independently for each angle or wavelength width of each optical information included in the imaging target, so that a multiplexed image of each optical information can be encoded by the image sensor.
  • the multiplexed image is separated and reconstructed by the image processing unit, and it is possible to efficiently realize wide angle, multi-wavelength, and high resolution of video recording with a simple configuration.
  • the volume hologram optical element may be configured by laminating a plurality of hologram elements having different interference fringe patterns.
  • the plurality of hologram elements that constitute the volume hologram optical element may be configured such that an inclination angle or an arrangement thereof can be adjusted respectively.
  • the PSF Point Spread Function
  • the image processing unit may restore the multiplexed image using the sparsity of the image to be restored.
  • the volume hologram optical element and the image sensor can mathematically restore the multiplexed image generated from the encoded image that is divided and encoded independently for each optical information to be imaged. Therefore, wide-angle video recording, multiple wavelengths, and high resolution can be realized.
  • a lens may be provided between the volume hologram optical element and the image sensor.
  • a lensless system in which no lens is provided between the volume hologram optical element and the image sensor may be used.
  • another aspect of the present invention is an imaging method for imaging an imaging target including a plurality of optical information, the dividing step for dividing the plurality of optical information of the imaging target for each small visual field and wavelength width,
  • Each of the plurality of optical information divided in the step is encoded by a volume hologram optical element to obtain an encoded image, and each of the encoded images obtained for each of the plurality of optical information is an image sensor.
  • a multiplexing process for obtaining a multiplexed image by multiplexing and a restoration processing step for restoring the multiplexed image by compressed sensing using the sparsity of the image to be restored.
  • each optical information included in the imaging target can be divided for each optical information and independently encoded. For this reason, after acquiring a multiplexed image of each optical information with an image sensor, the image processing unit separates and reconstructs the multiplexed image, and efficiently widens the video recording with a simple configuration, increases the wavelength, High resolution can be realized.
  • FIG. 1 is a block diagram showing a schematic configuration of an imaging system according to an embodiment of the present invention.
  • 2A and 2B are block diagrams illustrating a schematic configuration of an imaging unit included in the imaging system according to the embodiment of the present invention.
  • FIG. 3 is an operation explanatory diagram of the imaging system according to the embodiment of the present invention.
  • FIG. 4 is a flowchart showing an outline of an imaging method to which an imaging system according to an embodiment of the present invention is applied.
  • 5A to 5D are explanatory diagrams illustrating imaging results obtained by the imaging system according to the embodiment of the present invention.
  • 6A and 6B are explanatory views showing a schematic configuration of an aspect of a volume hologram optical element provided in an imaging system according to an embodiment of the present invention.
  • FIG. 7 is an explanatory diagram showing an imaging result by an imaging system according to an embodiment of the present invention including the volume hologram optical element shown in FIGS. 6A and 6B.
  • FIG. 1 is a block diagram illustrating a schematic configuration of an imaging system according to an embodiment of the present invention
  • FIGS. 2A and 2B illustrate a schematic configuration of an imaging unit included in the imaging system according to an embodiment of the present invention. It is a block diagram.
  • the imaging system 100 according to an embodiment of the present invention is applied when imaging an imaging target including a plurality of optical information. That is, the imaging system 100 according to the present embodiment increases the resolution of an imaging target when the imaging target has a large amount of information such as wide field of view, multiple wavelengths, or a high number of pixels. It is applied when doing.
  • the imaging system 100 includes an imaging unit 102 that converts a pixel signal obtained by imaging an imaging target that is a subject into image data, and image data converted by the imaging unit 102. And an image processing unit 108 for performing predetermined image processing.
  • the imaging unit 102 has a function of imaging an imaging target using emitted light, and includes a volume hologram optical element (hereinafter also referred to as vHOE) 104 and an image sensor 106. Consists of.
  • the volume hologram optical element 104 has a function of encoding and modulating after dividing an imaging target for each optical information.
  • the image sensor 106 has a function of multiplexing each encoded image encoded by the volume hologram optical element 104 to obtain a multiplexed image.
  • the imaging unit 102 may be a filter-added imaging unit 102a by providing a lens 105 between the volume hologram optical element 104 having a modulation function and the image sensor 106. Good. Also. When the volume hologram optical element 104 has both a modulation function and a lens function, the image pickup unit 102 is a lensless type image pickup unit 102b including only the volume hologram optical element 104 and the image sensor 106 as shown in FIG. 2B. It is good. Furthermore, the lens function may be changed to a lens array and image reconstruction, and the optical system may be further shortened in focal length and thinned. Details of operations and functions of the imaging unit 102 of the present embodiment will be described later.
  • the image processing unit 108 has a function of performing image processing on the image data acquired by the imaging unit 102.
  • the image processing unit 108 performs image processing so that the multiplexed image acquired by the image sensor 106 is subjected to image restoration processing by compression sensing, and imaging data to be imaged is separated and reconstructed.
  • the image processing unit 108 uses the property that there are many elements that have zero values when the reconstruction target is represented as an image vector, that is, sparseness, and uses a small amount of data to a large-scale data. Is restored with mathematical techniques applicable to linear systems. At this time, macro imaging can be expressed by a linear system, and a natural image can be expressed sparsely with almost no exception by performing some basis conversion using a basis conversion matrix or the like. Therefore, the image processing unit 108 using sparsity is used.
  • the image processing by is also useful for coded imaging (large-scale image reconstruction). For this reason, as an application thereof, it becomes possible to realize separation and reconstruction of multiple images of imaging information that are independently modulated.
  • the imaging unit 102 is provided with the volume hologram optical element 104 on the front side of the image sensor 106, whereby each optical information included in the imaging target is divided for each optical information independently. Can be encoded. For this reason, by acquiring a multiplexed image of each optical information by the image sensor 106 and then separating and reconstructing the multiplexed image by the image processing unit 108, the wide angle of video recording can be efficiently widened with a simple configuration, Multi-wavelength and high resolution can be realized.
  • FIG. 3 is an operation explanatory diagram of the imaging system according to the embodiment of the present invention.
  • An imaging system 100 uses a volume hologram optical element (vHOE) 104 as an optical element constituting the imaging unit 102, thereby miniaturizing an imaging system that captures image information of a plurality of wavelengths and fields of view. It is characterized by realizing. That is, the imaging system 100 according to the present embodiment is characterized by using the volume hologram optical element 104 to simultaneously realize the compactness of the apparatus in the camera and a high amount of imaging information.
  • vHOE volume hologram optical element
  • the volume hologram optical element 104 has a wavefront reproducibility that reproduces the wavefront of light recorded during hologram exposure when light is incident, and an angle selectivity that enables recording and reproduction of an independent wavefront for each incident angle of light. In addition, it has wavelength selectivity that enables recording and reproduction of an independent wavefront for each wavelength of light.
  • volume hologram optical element 104 physically uses Bragg diffraction, there is no essential limitation on the incident angle of light. For this reason, as an angle selectivity of the volume hologram optical element 104, for example, light entering the camera at an incident angle of 90 degrees can be transmitted to the sensor.
  • the wavelength selectivity of the volume hologram optical element 104 eliminates an essential limitation on the wavelength size, so that wavefront recording / reproduction can be independently performed not only with visible light but also with sound waves, infrared rays, X-rays, and the like. . Therefore, the volume hologram optical element 104 has a prism function so as to guide all light incident from various fields of view to the image sensor 106 and has different impulse responses (PSF: Point : Spread Function for each field of view / wavelength). ), It is possible to realize optical encoding independent of the field of view and wavelength and multiplex image shooting with a single element.
  • PSF Point : Spread Function for each field of view / wavelength
  • the volume hologram optical element 104 has wavefront reproducibility, angle selectivity, and wavelength selectivity. Therefore, by using these properties of the volume hologram optical element 104, an optical code independent of field and wavelength is used.
  • a highly functional optical element having a prism function that can be realized and multiplexed can be realized.
  • the volume hologram optical element 104 includes a prism (light propagation direction modulation) function, a field wavelength independent encoding function, and a sensor surface of the encoded image.
  • the volume hologram optical element 104 further has an imaging function (convex lens function or condensing type phase modulation). Function).
  • the volume hologram optical element 104 provided on the front side of the imaging unit 102 displays a plurality of pieces of optical information to be imaged via the volume hologram optical element 104 with a small field of view and wavelength width. Divide every. Specifically, as shown in FIG. 3, when a flower D1 and an apple D2 are included as optical information to be imaged, a light angle A1 that is a field of view for imaging the flower D1, a flower D1 and an apple D2 It divides
  • the volume hologram optical element 104 independently modulates and encodes each of the optical information divided for each of the light angles A1 to A4. As shown in FIG. 3, the multiplexed image of the encoded images encoded by the volume hologram optical element 104 is acquired as an image of the multiplexed image D3 by the image sensor 106.
  • the multiplexed image D3 obtained by the image sensor 106 is subjected to image restoration processing and separated and reconstructed as imaging data to be imaged by an image processing unit 108 provided on the rear side of the imaging unit 102.
  • the multiplex image D3 is separated and reconstructed by image restoration processing based on compressed sensing that actively uses the sparsity of the image.
  • the upper limit of the information amount of the reconstructed image (the product of the angle of view, the sampling resolution, and the number of wavelengths) is the compression of the reconstructed image. It depends on the rate, that is, how sparse the object can be expressed on some basis space. For example, when the Lena image used as a standard image for experiments in the field of image engineering is intended to be reconstructed with an image quality index (Peak Signal-to-Noise Ratio) of 30 dB or more, the compression rate that can be set is about 10 Therefore, the upper limit of improvement in sampling resolution is 10 times that of a wide-angle camera having the same angle of view. Further, if the deterioration of the image quality of the reconstructed image is further allowed, further improvement in resolution can be expected. At that time, what image quality is acceptable is appropriately defined by the video system of the application destination.
  • the wavefront reproducibility, the angle selectivity, and the wavelength selectivity of the volume hologram optical element (vHOE) 104 are utilized, so that it cannot be realized with a general refractive / reflective optical element.
  • High-performance optical elements In particular, in recent years, since the commercial photopolymer used for the volume hologram optical element 104 has become highly sensitive and highly stable, the volume hologram optical element 104 can be generated with high accuracy. The feasibility of imaging a high amount of information (all or any of wide field of view, multiple wavelengths, and high pixel count) with optical elements is increasing.
  • the volume hologram optical element (vHOE) 104 having a high degree of design freedom and the image processing unit 106 capable of performing high-accuracy signal processing are combined and designed to achieve high resolution of an existing imaging method.
  • vHOE volume hologram optical element
  • FIG. 4 is a flowchart showing an outline of an imaging method to which an imaging system according to an embodiment of the present invention is applied
  • FIGS. 5A to 5D show imaging results by the imaging system according to an embodiment of the present invention. It is explanatory drawing.
  • An imaging method to which an imaging system according to an embodiment of the present invention is applied is an imaging method for imaging an imaging target including a plurality of optical information, and it is possible to efficiently widen video recording with a simple optical system configuration, It is characterized by being able to realize multiple wavelengths and high resolution.
  • the imaging method includes a division step S11, an encoding step S12, a multiplexing step S13, and a restoration processing step S14, and these steps S11 to S14 are performed. By performing the flow shown in FIG. 4, it is possible to efficiently realize widening, multi-wavelength, and high resolution of video recording.
  • a plurality of optical information to be imaged is divided for each small field of view and wavelength width.
  • the volume hologram optical element is provided on the front side of the imaging unit, a plurality of pieces of optical information to be imaged imaged through the volume hologram optical element are divided for each small field of view and wavelength width. .
  • a plurality of optical information divided in the dividing step S11 is encoded with a volume hologram optical element to obtain an encoded image.
  • each of the optical information divided for each field of view and wavelength width is independently modulated and encoded by the volume hologram optical element.
  • each of the encoded images obtained for each of the plurality of optical information is multiplexed by an image sensor to obtain a multiplexed image.
  • a multiplexed image of each of the encoded images encoded by the volume hologram optical element is acquired as an image of the multiplexed image by the image sensor.
  • the multiplexed image is restored by compression sensing using the sparsity of the image to be restored and separated and reconstructed.
  • the multiplexed image obtained by the image sensor is separated and reconfigured by the image processing unit by image restoration processing by compression sensing that actively uses the sparsity of the image.
  • the properties of the volume hologram optical element are used to divide each optical information included in the imaging target independently. Can be encoded. For this reason, a multiplexed image of each optical information is generated by an image sensor, and the multiplexed image is separated and reconstructed by an image processing unit. Resolution can be realized. That is, with a small and simple optical system composed of only a vHOE and an image sensor, and in some cases only a few auxiliary optical elements such as a vHOE, an image sensor, and a lens, all of a wide field of view, multiple wavelengths, and a large number of pixels are provided. It is possible to realize imaging with a high information amount that satisfies either of these.
  • FIG. 5A The captured image shown in FIG. 5A is obtained by applying the imaging system and imaging method of the present embodiment.
  • FIG. 5B shows an example in which encoding based on image division of the image recorded in FIG. 5A is displayed in an easy-to-understand manner with the division width emphasized.
  • the imaging system and the imaging method of the present embodiment by applying the imaging system and the imaging method of the present embodiment and separating and reconstructing the image by the image restoration process using the compression sensing that actively uses the sparsity of the image, the image of one field of view shown in FIG. An image of another field of view shown in FIG. 5D is obtained. From this, it can be seen that the image pickup system and the image pickup method of the present embodiment can efficiently realize wide-angle, multi-wavelength, and high-resolution video recording with a simple configuration.
  • the volume hologram optical element 104 can reproduce and reproduce the wavefront of the light recorded at the time of hologram exposure when light is incident, and can record and reproduce the wavefront independently for each incident angle of light. And wavelength selectivity that enables recording and reproduction of an independent wavefront for each wavelength of light.
  • the volume hologram optical element 104 in order for the volume hologram optical element 104 to have angle selectivity and wavelength selectivity, it is necessary to provide the volume hologram optical element 104 with different interference fringe patterns corresponding to the respective angles and wavelengths. For this reason, conventionally, in order to provide different interference fringe patterns on the volume hologram optical element, many exposures are performed as many times as necessary to provide different interference fringe patterns.
  • the volume hologram optical element 104 provided in the imaging system 100 according to the embodiment of the present invention, for example, a plurality of hologram elements 104a and 104b having different optical characteristics such as diffraction efficiency and refraction angle as shown in FIG. It is also possible to provide a configuration in which the hologram elements 104a, 104b, 104c, and 104d are stacked as shown in FIG. 6B after providing different interference fringe patterns on the respective 104c and 104d. That is, in the present embodiment, the volume hologram optical element 104 may be configured by laminating a plurality of hologram elements 104a, 104b, 104c, and 104d having different interference fringe patterns.
  • the volume hologram optical element 104 can receive incident light at various angles as shown in FIG. 6B. Therefore, the optical information included in the imaging target is divided and encoded for each optical information, and enters the image sensor of the camera 103. For this reason, each optical information included in the imaging target is divided for each optical information and encoded independently. Therefore, after the multiplexed image of each optical information is acquired by the image sensor, the subsequent image processing unit 108 is acquired. By separating and reconstructing the multiplexed image in (see FIG. 1), it is possible to efficiently realize a wide angle, a multi-wavelength, and a high resolution of video recording.
  • the volume hologram optical element 104 is not formed by multiple exposure, and a desired interference fringe pattern is formed by exposing each of the different hologram elements 104a, 104b, 104c, and 104d.
  • the hologram elements 104a, 104b, 104c, and 104d are stacked to form. For this reason, since the number of times of multiple exposure of the hologram can be reduced, it is possible to reduce the diffraction efficiency of the volume hologram optical element 104 and the risk of crosstalk.
  • the hologram element is usually exposed to a photopolymer that constitutes the hologram element, whereby the monomer that constitutes the photopolymer moves to form a desired interference fringe.
  • the interference fringes cause crosstalk.
  • different interference fringe patterns are formed by exposing to different hologram elements 104a, 104b, 104c, and 104d, and the movement of the monomers constituting the interference fringes is stopped.
  • the volume hologram optical element 104 is configured by stacking these hologram elements 104a, 104b, 104c, and 104d. By doing so, the interference fringes formed in the hologram elements 104a, 104b, 104c, and 104d are in a stable state, so that the optical performance of the volume hologram optical element 104 is improved.
  • the volume hologram optical element 104 has a configuration in which a plurality of hologram elements 104a, 104b, 104c, and 104d having different interference fringe patterns are laminated, so that these hologram elements 104a, 104b, and 104c are stacked.
  • 104d are configured to be adjustable in inclination angle or arrangement. Therefore, even after the volume hologram optical element 104 is exposed and interference fringes are provided, the PSF can be designed and controlled flexibly by adjusting the inclination angle or arrangement of the hologram elements 104a, 104b, 104c, and 104d. become.
  • volume hologram optical element 104 included in the imaging system 100 By configuring the volume hologram optical element 104 included in the imaging system 100 according to the embodiment of the present invention in such a configuration, as shown in FIG. 7, printing that displays “A” that is a laser-provided diffused object.
  • the paper D6 and the printing paper D7 displaying “B” are picked up by the camera 103 including the lens and the image sensor, a multiple image D8 of “A” and “B” displayed on the printing paper D6 and D7 is acquired.
  • an image D9 of one field of view by the reconstructed field of view And an image D10 of another field of view is obtained.
  • the volume hologram optical element 104 can efficiently widen the angle of video recording, increase the wavelength, and increase the resolution even when the plurality of hologram elements 104a, 104b, 104c, and 104d having different interference fringe patterns are stacked. It can be seen that this can be realized.
  • the volume hologram optical element 104 is configured by stacking four different hologram elements 104 a, 104 b, 104 c, and 104 d, but the number of hologram elements to be stacked constituting the volume hologram optical element 104 is not limited. Is not limited to four, and may be composed of other numbers.
  • single-shot wide-angle, multi-wavelength, high-resolution imaging as realized by a camera array / sensor array can be performed using volume hologram optics.
  • This can be realized with a small and simple optical system in which an element and an image sensor (in some cases, an auxiliary optical element such as a lens) are added.
  • volume hologram optical element which is an optical element that independently encodes image information of a plurality of fields of view and wavelengths, as an imaging means of an imaging system
  • an image can be obtained by a compact device such as a miniaturized camera. It is possible to easily realize a high amount of image information with a wide angle of recording, multiple wavelengths, and high resolution.
  • an ultra-high pixel multispectral camera can be realized with a size, cost, and imaging time that can be easily used by the user. That is, the imaging system and the imaging method according to an embodiment of the present invention can be applied as a new basic technology for image input in an information era where imaging and image analysis target information processing is progressing. Value.
  • imaging system 102 imaging unit, 103 camera, 104 volume hologram optical element, 104a, 104b, 104c, 104d hologram element, 106 image sensor, 108 image processing unit

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  • Spectroscopy & Molecular Physics (AREA)
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  • Signal Processing (AREA)
  • Multimedia (AREA)
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Abstract

Dans le but d'obtenir un enregistrement vidéo avec un angle plus large, plus de longueurs d'onde et une résolution plus élevée tout en réduisant la taille d'un dispositif au moyen d'une configuration simple utilisant un seul élément, l'invention concerne un système d'imagerie (100), qui capture une image d'un sujet d'imagerie contenant de multiples éléments d'informations optiques, lequel est caractérisé en ce qu'il est équipé : d'un élément optique d'hologramme de volume (104) qui divise le sujet d'imagerie pour chaque élément d'informations optiques et le code par la suite ; d'un capteur d'image (106) qui obtient une image multiplexée par multiplexage des images codées qui ont été codées par l'élément optique d'hologramme de volume ; et d'une unité de traitement d'image (108) qui effectue un traitement de restauration d'image sur l'image multiplexée obtenue par le capteur d'image au moyen d'une détection de compression et qui sépare et reconstruit les données d'imagerie du sujet d'imagerie.
PCT/JP2018/016594 2017-05-10 2018-04-24 Système d'imagerie et procédé d'imagerie WO2018207613A1 (fr)

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