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A Non-Photorealistic Rendering Method for Volume Data Based on GPU Acceleration

A technology of non-realistic rendering and volume data, applied in image data processing, 3D image processing, instruments, etc., can solve problems such as low efficiency and acceleration, and achieve good rendering effect, rendering effect and realistic effect

Active Publication Date: 2016-03-30
BEIHANG UNIV
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Problems solved by technology

[0006] The edge-based traversal detection algorithm directly traverses all the edges, and judges that the product of the line of sight and the normal vector of the surface is not less than 0, and the surface is facing the front, otherwise, the surface is facing the back. This method is simple but inefficient. Gooch proposed to use Gaussian ball to speed up the algorithm

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  • A Non-Photorealistic Rendering Method for Volume Data Based on GPU Acceleration
  • A Non-Photorealistic Rendering Method for Volume Data Based on GPU Acceleration
  • A Non-Photorealistic Rendering Method for Volume Data Based on GPU Acceleration

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Embodiment Construction

[0034] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments of the present invention.

[0035] For a given volume data consisting of voxels ( figure 2 voxelgrid), this method includes the following steps for the non-realistic rendering of the volume data:

[0036] Step (1) We set six viewpoints ( figure 2 In the eye point, the other five viewpoints are not shown) in the six positive and negative directions of the X, Y, and Z coordinate axes, the scene is drawn by Raycasting (RayCasting). This method is an algorithm based on the image space. From each pixel of the image, a ray is emitted along the direction of the line of sight. The ray passes through the entire scene. The value and opacity are accumulated until the light breaks out of the scene. The cumulative formula of color and opacity is as formula (1) (sampled and synthesized from the back to the front):

[0037] C ...

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Abstract

The invention relates to a volume data non-photorealistic rendering method based on GPU (graphic processing unit) acceleration. The method comprises the following steps of carrying out the direct volume rendering for medical volume data under multiple viewpoints, acquiring a plurality of rendering results, extracting a characteristic line for the two-dimensional rendering result, defining a global energy miniaturization rule, calculating a three-dimensional characteristic line, utilizing a convolution surface method to define a scalar field, clustering the three-dimensional characteristic line, utilizing a B-type curve to fit the line, and completing the stylized rendering. By utilizing the powerful calculation capacity of the GPU, the rendering speed and efficiency can be greatly improved.

Description

technical field [0001] The invention belongs to the technical field of unrealistic rendering and volume rendering, and in particular relates to a non-realistic rendering method for volume data based on GPU acceleration. Background technique [0002] As an effective supplement to photorealistic rendering, non-photorealistic rendering is not aimed at the authenticity of graphics, but mainly to produce an artistic effect similar to the artist's work, showing the artistic characteristics of graphics. It has been used in education, entertainment, art and other fields have been widely used. However, due to the increasing scale of 3D data and the increasingly complex processing methods, non-photorealistic volume rendering is also facing the same problem as traditional volume rendering: the contradiction between image quality and rendering speed. With the emergence of programmable graphics hardware, non-photorealistic rendering based on GPU (Graphics Process Unit, Graphics Processi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T15/08
Inventor 王莉莉王立平侯飞李帅
Owner BEIHANG UNIV
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