Method to calculate the far field of three-dimensional objects for computer-generated holography

Bayraktar, Muharrem; Özcan, Meriç

doi:10.1364/ao.49.004647

Cited by 45 publications

(20 citation statements)

References 54 publications

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“…We compare our method with GPU implementations of two other methods: (1) the wave-field method proposed in [28], which computes complex wave scattered by each layer using a wave-field approach, and (2) the point-source method proposed in [4], which computes complex wave scattered by each layer using 1 The 8-bits pixels in the disparity maps can have 256 different values, but in this dataset, the 0 value is used to encode an unknown disparity. Points with unknown disparity are not extracted from the disparity maps.…”

Section: Resultsmentioning

confidence: 99%

Complex modulation computer-generated hologram by a fast hybrid point-source/wave-field approach

Gules

Gioia

Cozot

et al. 2015

2015 IEEE International Conference on Image Processing (ICIP)

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International audienceWe propose a fast Computer-Generated Hologram (CGH) computation method based on a hybrid point-source/wave-field approach. Whereas previously proposed methods tried to reduce the computational complexity of the point-source or the wave-field approaches independently, our method uses the two approaches together and therefore takes advantages from both of them. The algorithm consists of three steps. First, the 3D scene is sliced into several depth layers parallel to the hologram plane. Then, for each layer, we compute the complex wave scattered by this layer either using a wave-field or a point-source approach according to a threshold criterion on the number of points within the layer. Finally, we sum up the complex waves scattered by all the depth layers in order to obtain the final CGH. Experimental results reveal that this combination of approaches does not produce any visible artifact and outperforms both the point-source and wave-field approaches

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Section: Resultsmentioning

confidence: 99%

Complex modulation computer-generated hologram by a fast hybrid point-source/wave-field approach

Gules

Gioia

Cozot

et al. 2015

2015 IEEE International Conference on Image Processing (ICIP)

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“…Another well-known CGH technique is the wave-field approach based on a layered model of the scene [30,31]. In this approach, 3D scenes are sliced into depth layers parallel to the hologram.…”

Section: Wave-field Approachmentioning

confidence: 99%

“…We call dz the distance between each depth layer. Nz is set such that the separation between two consecutive layers remains invisible [31]. The depth layers are numbered from 0 to Nz − 1, from the farthest to the nearest to the hologram plane.…”

Section: Proposed Hybrid Approachmentioning

confidence: 99%

Hybrid approach for fast occlusion processing in computer-generated hologram calculation

et al. 2016

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A hybrid approach for fast occlusion processing in computer-generated hologram calculation is studied in this paper. The proposed method is based on the combination of two commonly used approaches that complement one another: the point-source and wave-field approaches. By using these two approaches together, the proposed method thus takes advantage of both of them. In this method, the 3D scene is first sliced into several depth layers parallel to the hologram plane. Light scattered by the scene is then propagated and shielded from one layer to another using either a point-source or a wave-field approach according to a threshold criterion on the number of points within the layer. Finally, the hologram is obtained by computing the propagation of light from the nearest layer to the hologram plane. Experimental results reveal that the proposed method does not produce any visible artifact and outperforms both the point-source and wave-field approaches.

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“…These experimental results show that the CGH pattern is accurately updated at each video frame and that the proposed method does not reduce the quality of the reconstructed scene images compared to the hybrid method. In order to evaluate the performance of the proposed method in terms of computation time, we compare it with GPU implementations of four other methods: (1) the method proposed in [32], based on a wave-field approach, (2) the method proposed in [11], based on a point-source approach, (3) the method proposed in [28], based on a point-source approach and incremental update of the CGH at each frame, and (4) the method proposed in [26], based on a hybrid approach. In the following, these methods are called wave-field method, point-source method, incremental method and hybrid method, respectively.…”

Section: Input 3d Videomentioning

confidence: 99%

Fast generation of complex modulation video holograms using temporal redundancy compression and hybrid point-source/wave-field approaches

Gilles¹,

Gioia

Cozot

et al. 2015

Applications of Digital Image Processing XXXVIII

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International audienceThe hybrid point-source/wave-field method is a newly proposed approach for Computer-Generated Holo-gram (CGH) calculation, based on the slicing of the scene into several depth layers parallel to the hologram plane. The complex wave scattered by each depth layer is then computed using either a wave-field or a point-source approach according to a threshold criterion on the number of points within the layer. Finally, the complex waves scattered by all the depth layers are summed up in order to obtain the final CGH. Although outperforming both point-source and wave-field methods without producing any visible artifact, this approach has not yet been used for animated holograms, and the possible exploitation of temporal redundancies has not been studied. In this paper, we propose a fast computation of video holograms by taking into account those redundancies. Our algorithm consists of three steps. First, intensity and depth data of the current 3D video frame are extracted and compared with those of the previous frame in order to remove temporally redundant data. Then the CGH pattern for this compressed frame is generated using the hybrid point-source/wave-field approach. The resulting CGH pattern is finally transmitted to the video output and stored in the previous frame buffer. Experimental results reveal that our proposed method is able to produce video holograms at interactive rates without producing any visible artifact

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Method to calculate the far field of three-dimensional objects for computer-generated holography

Cited by 45 publications

References 54 publications

Complex modulation computer-generated hologram by a fast hybrid point-source/wave-field approach

Complex modulation computer-generated hologram by a fast hybrid point-source/wave-field approach

Hybrid approach for fast occlusion processing in computer-generated hologram calculation

Fast generation of complex modulation video holograms using temporal redundancy compression and hybrid point-source/wave-field approaches

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