Synthesizing computer generated holograms with reduced number of perspective projections

Katz, Barak; Shaked, Natan T.; Rosen, Joseph

doi:10.1364/oe.15.013250

Cited by 29 publications

(20 citation statements)

References 8 publications

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“…1, the projection lines converge to one vanishing point in the perspective projection case, while they are all parallel in the orthographic case. Previous research has been based on the perspective projection geography, hence there are limitations on the projection angle [5,6] or the object distance [3,7]. The proposed method utilizes the orthographic image instead of the perspective image, leading to the generation of an exact Fourier hologram without any approximation.…”

Section: Principlementioning

confidence: 99%

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Hologram Generation of 3D Objects Using Multiple Orthographic View Images

Kim¹,

Baasantseren²,

Kim³

et al. 2008

Journal of the Optical Society of Korea

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We propose a new synthesis method for the hologram of 3D objects using incoherent multiple orthographic view images. The 3D objects are captured and their multiple orthographic view images are generated from the captured image. Each orthographic view image is numerically overridden by the plane wave propagating in the direction of the corresponding view angle and integrated to form a point in the hologram plane. By repeating this process for all orthographic view images, we can generate the Fourier hologram of the 3D objects.

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Section: Principlementioning

confidence: 99%

“…A method synthesizing the hologram with incoherent multi-view images has been reported in order to eliminate the necessity of the coherent image system [2]. However, this method uses perspective projection images as view images, requiring some approximations, to get the desired hologram [3].…”

Section: Introductionmentioning

confidence: 99%

Hologram Generation of 3D Objects Using Multiple Orthographic View Images

Kim¹,

Baasantseren²,

Kim³

et al. 2008

Journal of the Optical Society of Korea

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“…In the first method, we use a microlens array for acquiring the entire viewpoint projections of the 3-D scene in a single camera shot [6]. In the second method, we acquire only a small number of extreme projections and predict the middle projections in the computer by use of the view synthesis algorithm [7]. Sando et al [8] proposed another method for decreasing the number of projections by scanning the scene along various transverse curvatures.…”

Section: Introductionmentioning

confidence: 99%

Modified Fresnel computer-generated hologram directly recorded by multiple-viewpoint projections

Shaked

Rosen

2008

Appl. Opt.

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An efficient method for obtaining modified Fresnel holograms of real existing three-dimensional (3-D) scenes illuminated by incoherent white light is presented. To calculate the hologram, the method uses multiple-viewpoint projections of the 3-D scene. However, contrary to other similar methods, this one is able to calculate the Fresnel hologram of the 3-D scene directly rather than calculating a Fourier hologram first. This significantly decreases the amount of calculations needed to obtain the hologram and also reduces the reconstruction errors. The proposed method is first mathematically introduced and then demonstrated by both simulations and experiments.

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“…The camera captures the entire macrolens image plane in a single snapshot. Afterward, the view synthesis algorithm [7] is used to predict the middle projections by performing 3-D interpolations on the acquired projections. Finally, the entire projection set is used to compute the two-dimensional (2-D) digital incoherent modified Fresnel hologram (DIMFH) [8] of the 3-D scene.…”

mentioning

confidence: 99%

“…Given two projections, this algorithm first calculates the correspondence map containing the displacements of each pair of corresponding pixels in the two given projections. Then, the algorithm predicts how the scene would look from a new middle viewpoint by interpolating the locations and intensities of the corresponding pixels [7].…”

mentioning

confidence: 99%

Fluorescence multicolor hologram recorded by using a macrolens array

2008

Self Cite

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We present a new efficient method for obtaining multicolor digital Fresnel holograms of three-dimensional (3-D) objects emitting incoherent fluorescent light. For each emitted fluorescent light wavelength, a single monochromatic digital modified Fresnel hologram of the 3-D scene is generated. Using a macrolens array, only nine projections of the 3-D scene are captured in a single camera shot and are then digitally processed to yield the hologram. The 3-D reconstructed images from all the monochromatic holograms are composed into a single multicolor image of the 3-D scene. Fluorescence radiation is useful for various applications in the fields of medical imaging, microscopy, biology, and chemistry. High sensitivity, low background noise, and thus good detectability and localization [1] are only some of the advantages of fluorescence imaging that have encouraged the foundation of fluorescence three-dimensional (3-D) imaging methods. Holography is considered a reliable 3-D imaging technique, capable of creating an authentic illusion of 3-D objects without special observation devices. Moreover, digital holograms can store 3-D information in a very dense and encrypted way. However, classic holographic methods demand wave interference, requiring meticulous stability of the entire optical system, as well as a high intensity and long coherence length of the laser used.New techniques for generating holograms of 3-D objects emitting fluorescent (incoherent) light have the advantages of fluorescence over regular illumination and yet eliminate most of the disadvantages of conventional holography. Fluorescence scanning holography [2] is an example of such a technique. However, this method is relatively slow and complicated because of the mechanical scanning required. Multicolor Fresnel incoherent correlation holography [3] is a different technique that does not use mechanical scanning. However, three different holograms for each emitted wavelength should be recorded for generating the final hologram by multicolor Fresnel incoherent correlation holography, in contrast to the method proposed herein.By using multiple viewpoint projection (MVP) holography [4,5], it is possible to generate digital and optical holograms of 3-D, real-existing objects illuminated by incoherent light. These holograms are generated by first acquiring MVPs of the 3-D scene from various perspectives and then digitally processing the MVPs to yield the hologram of the scene.For acquiring these MVPs, the digital camera can be shifted mechanically [4,5]. However, this process is slow and inadequate when the objects move faster than the scanning camera. Instead, it is possible to utilize a microlens array for acquiring the entire set of MVPs in a single camera shot [6]. However, for a high-resolution hologram, an array of many microlenses is needed. Since the total size of the microlens array is limited, the diameter of each microlens is small, and thus each projection is imaged with a relatively poor resolution.To obtain MVP holograms of moving objects with...

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Synthesizing computer generated holograms with reduced number of perspective projections

Cited by 29 publications

References 8 publications

Hologram Generation of 3D Objects Using Multiple Orthographic View Images

Hologram Generation of 3D Objects Using Multiple Orthographic View Images

Modified Fresnel computer-generated hologram directly recorded by multiple-viewpoint projections

Fluorescence multicolor hologram recorded by using a macrolens array

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