Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Deviation control method in photon mapping

A technology of photon mapping and control methods, applied in the processing of 3D images, instruments, calculations, etc., to achieve the effect of eliminating visible deviations and reducing noise errors

Active Publication Date: 2015-12-23
PEKING UNIV
View PDF4 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Deviation control method in photon mapping
  • Deviation control method in photon mapping
  • Deviation control method in photon mapping

Examples

Experimental program
Comparison scheme
Effect test

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 (PhotonMap), called the photon tracing process (PhotonTracingPass); the second pass emits light from the viewpoint position and traverses the scene , when the light intersects with the scene to generate an intersection point, the photon collection method is used according to the stored photon graph and the radiance calculation is performed on the collected photons, and finally the radiance value of the intersection point is calculated and displayed on the image, which is called the ray tracing process (Ray Tracing Pass). The process of calculating the radiance of the photons collected at the intersection point is also c...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G06T15/55
Inventor 李胜孟洋汪国平
Owner PEKING UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com