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Method, visualization device, and computer program product for visualizing a three-dimensional object

A technology of three-dimensional objects and objects, applied in computing, 3D image processing, image data processing, etc., can solve problems such as large computing costs, and achieve the effect of avoiding cascading bifurcations

Active Publication Date: 2017-08-18
SIEMENS HEALTHCARE GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in order to calculate the actual shading effect, other rays within the object volume must be traced in addition to the corresponding visible rays, resulting in a large computational cost

Method used

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  • Method, visualization device, and computer program product for visualizing a three-dimensional object
  • Method, visualization device, and computer program product for visualizing a three-dimensional object
  • Method, visualization device, and computer program product for visualizing a three-dimensional object

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Embodiment Construction

[0032] Figure 1-3 The visualization of the 3D object OBJ is clarified separately. The three-dimensional object OBJ can be, for example, an object part that is virtually modeled from tomographic data. exist Figure 1-3 The structure illustrated in is preferably simulated by a computer as a virtual structure. Preferably, a substantial part of the calculations required for this can be extended to the graphics card of the computer and executed there in a massively parallel manner. The object OBJ is contained in a three-dimensional object volume OV, which is outlined by a dotted rectangle. The object OBJ is represented within the object volume OV by volume data which describe the density of the object OBJ to be visualized in three dimensions or spatial resolution. In this case, the density can describe, in particular, the physical density, optical density, refractive index and / or brightness, color, transparency and / or opacity of the object OBJ with three-dimensional resolution...

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Abstract

The inner volume of a heterogeneous three-dimensional object (OBJ) is visualized by means of a plurality of simulated visual rays (R1,...,R6). For each visual ray (R1,...,R6) entering the object volume (OV), i) a scattering position is determined along the visual ray (R1,...,R6), ii) a scattering direction is selected in accordance with a random process, and iii) the visual ray (R1,...,R6) is scattered in the selected scattering direction at the scattering position. Steps i) to iii) are repeated until the visual ray (R1,...,R6) is absorbed in the object volume (OV) or exits the object volume (OV), wherein the exiting visual ray hits an illumination source (LP1,...,LP3, LS1, LS2) and an illumination contribution of the visual ray (R1,...,R6) to a visualization pixel in question is determined in accordance with a brightness value and / or color value of the illumination source (LP1,...,LP3, LS1, LS2). Statistical averaging is performed over the illumination contributions of the plurality of visual rays (R1,...,R6) in order to determine a brightness value and / or color value for the visualization pixel in question.

Description

technical field [0001] The invention relates to the technical field of volume rendering, that is to say the visualization of inhomogeneous three-dimensional objects by means of image synthesis. Such objects can in particular be real objects or virtually modeled objects. The visualization of three-dimensional objects has several fields of application, in particular in medicine, in geophysics, in materials research, in the field of virtual reality and / or in computer games. Background technique [0002] In the case of volume rendering, internal volumes are also visualized, ie not only surfaces of inhomogeneous objects are visualized, so that transparency effects and / or internal structures can also be reproduced in a realistic manner. In this case, three-dimensional objects are represented by volumetric data with three-dimensional resolution. [0003] A known method of volume rendering is so-called ray-casting, in which the course of imaginary rays, referred to below as visibl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T15/08G06T15/50
CPCG06T15/08G06T15/506G06T15/06
Inventor K.恩格尔
Owner SIEMENS HEALTHCARE GMBH