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Bias Control Methods in Photon Mapping

A technology of photon mapping and control method, applied in the deviation control of photon mapping, in the field of photorealistic images, to achieve the effect of reducing noise errors and eliminating visible deviations

Active Publication Date: 2018-01-09
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the deviation and noise problems existing in the photon mapping algorithm, the present invention provides a deviation control method in the photon mapping, which can effectively eliminate the deviation and noise generated by inappropriate collection of photons

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  • Bias Control Methods in Photon Mapping
  • Bias Control Methods in Photon Mapping

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Embodiment Construction

[0036] In order to make the above objects, features and advantages of the present invention more obvious and understandable, the present invention will be further described below through specific embodiments and accompanying drawings.

[0037] Standard photon mapping uses a two-pass process to draw an image. The first pass uses ray tracing to build a photon map (Photon Map), called the photon tracing process (Photon Tracing Pass); the second pass emits light from the viewpoint position at Traversing in the scene, when the ray intersects with the scene to generate an intersection point, the photon collection method is used according to the stored photon graph and the radiance of the collected photons is calculated, and finally the radiance value of the intersection point is calculated and displayed on the image, which is called Ray Tracing Pass. The process of calculating the radiance of the photons collected at the intersection point is also called Radiance Evaluation or Radia...

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Abstract

The invention relates to a deviation control method in photon mapping. The method comprises the following steps: 1, according to an estimated radius of an intersection point generated when light intersects with a scene, and collecting photons nearby the intersection point by use of a KNN method; 2, performing visibility determining on the collected photons so as to reject impure photons; 3, performing topology deviation control on the collected photons through depth continuity detection; 4, according to a normal topology structure of a surface which the collected photons are attached to, performing geometric continuity detection on the surface of the intersection point so as to control impurity deviations; 5, carrying out edge deviation control on the collected photons through convex surface examination; and 6, carrying out radiation brightness estimation by use of a radiation brightness calculation formula by taking residual photons as correct and effective photons. Then an obtained radiation brightness calculation value is converted into a color value, and thus a final highly realistic image is synthesized. The method provided by the invention can effectively eliminate the problem of deviation and noise which are generated by inappropriate collection of the photons.

Description

technical field [0001] The invention belongs to the technical field of computer graphics, and in particular relates to a deviation control method in photon mapping, which can be used to draw realistic images with good lighting effects. Background technique [0002] People's demand for realistic lighting effects using computer graphics methods is endless, and simulating complex lighting effects in the real world is a major problem that graphics researchers have always needed to solve. Global Illumination (Global Illumination), also known as overall light illumination, is the main way to achieve photo-realistic images, and many algorithms try to provide complete and effective solutions for it. The ray tracing algorithm and the photon mapping algorithm mainly studied in this invention are classic algorithms of global illumination. Compared with ray tracing, the photon mapping algorithm is a realistic rendering technology that has been continuously developed in the past two deca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T15/55
Inventor 李胜孟洋汪国平
Owner PEKING UNIV
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