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Computational holographic occlusion processing algorithm based on ray tracing

A technology of ray tracing and occlusion processing, which is applied in computing, image data processing, instruments, etc. It can solve the problems of unable to restore the spatial position relationship and the large amount of calculation, so as to achieve the effect of object occlusion, improve efficiency, and reduce redundant calculations Effect

Active Publication Date: 2018-06-29
BEIHANG UNIV
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Problems solved by technology

Since the hologram calculation process itself has the characteristics of a large amount of calculation, most hologram calculation algorithms do not consider the processing of the occlusion effect between objects in the scene and the object itself, which leads to the inability to restore the reconstruction image of the object in the holographic reproduction process. The correct spatial position relationship between them, presenting a "transparent" effect

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  • Computational holographic occlusion processing algorithm based on ray tracing
  • Computational holographic occlusion processing algorithm based on ray tracing
  • Computational holographic occlusion processing algorithm based on ray tracing

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Embodiment Construction

[0058] The specific implementation method of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0059] The present invention designs a fast intersection algorithm for point cloud model ray tracing, constructs a KD-Tree acceleration structure by subdividing the space bounding box where the point cloud of the object is located, controls the size of the KD-Tree leaf node, and puts all objects located in the same leaf node The object points are considered as a whole, ignoring the mutual occlusion relationship between internal points, so that the occlusion relationship between object points is transformed into the occlusion relationship between KD-Tree leaf nodes, which solves the problem of ray tracing algorithm in use For the problem that the intersection operation cannot be directly performed on the point cloud model, a more accurate occlusion effect is achieved by constraining the size of the leaf nodes; at the same time, the...

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Abstract

The invention provides a computational holographic occlusion processing algorithm based on ray tracing and belongs to the field of holographic stereoscopic display and virtual reality. Firstly, a KD-Tree structure is constructed by spatially dividing a bounding box, the size of KD-Tree leaf nodes is controlled, and an occlusion relationship between objects is transformed into an occlusion relationship between the KD-Tree leaf nodes to achieve a ray tracing process. A plurality of rays are used for tracing the KD-Tree structure, and a visible object point traced by each ray is obtained according to the leaf nodes the return values of which are non-zero; corresponding sub-holograms in different viewpoints are sequentially combined to obtain a final hologram, a moving parallax effect is achieved at the same time, and a three-dimensional stereoscopic image of a given object is obtained according to the final hologram. A correct object occlusion effect in holographic imaging is achieved, the redundancy calculation in a traversal process is reduced, the ray tracing efficiency is improved, and fast intersection calculation of ray tracing of a point cloud model is achieved.

Description

technical field [0001] The invention belongs to the fields of holographic stereoscopic display and virtual reality, and in particular relates to a computational holographic occlusion processing algorithm based on ray tracing. Background technique [0002] We live in a three-dimensional world. At present, people have made great achievements in the acquisition, storage, processing and transmission of three-dimensional information. However, it is a major technical problem to truly display these three-dimensional information. . The three-dimensional display technology that can reflect the real world is considered to be one of the greatest revolutions in the 21st century, and has been involved in many fields of daily life, such as 3D movies, entertainment performances, virtual reality and military training. 3D display has become a cutting-edge technology field, attracting many scientific researchers to engage in related work, and has also become the next generation of new displa...

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Application Information

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IPC IPC(8): G06T7/50G06T19/20
CPCG06T7/50G06T19/20G06T2207/10028
Inventor 李妮魏辉刘霜婷
Owner BEIHANG UNIV
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