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An Unbiased Photon Mapping Drawing Method

A photon mapping and photon technology, which is used in 3D image processing, image data processing, instruments, etc., can solve the problems of introducing bias and bias in the results, and achieve the effect of reducing burden, reducing production cost and improving efficiency.

Active Publication Date: 2018-03-16
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Density estimation can effectively reduce noise, but it also introduces bias to the final result, so all previous photon mapping methods are biased

Method used

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  • An Unbiased Photon Mapping Drawing Method
  • An Unbiased Photon Mapping Drawing Method
  • An Unbiased Photon Mapping Drawing Method

Examples

Experimental program
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Embodiment

[0124] The inventor implemented the algorithm described above on a computer equipped with an Intel i7 3.40GHz quad-core central processing unit and 16GB of memory, and implemented other drawing methods closely related to our algorithm, and generated the Render the result. The experimental results show that compared with the traditional biased photon mapping, our method can effectively eliminate image errors, and at the same time, because it does not need to reduce the collection radius, it can also take full advantage of the advantages of photon mapping, making the image noise smaller. Combining our method with bidirectional ray tracing, our method can more fully exploit the advantages of photon-mapping sampling techniques while avoiding image errors compared to vertex merging (VCM) methods. After combining our method with the Markov chain Monte Carlo method (MCMC), our method can significantly help the original MCMC method to improve the efficiency of the multiple reflection ...

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Abstract

The invention discloses an unbiased photon mapping drawing method. Photon mapping is recognized as one of the most effective rendering methods. However, previous photon mapping algorithms are biased in the calculation of collected photons, resulting in differences between the final rendering results and the real results. The invention directly connects the line of sight with the optical path where the photons are located, accurately calculates the light energy transmitted by the light path, and estimates the probability of collecting photons by the line of sight more unbiasedly, thereby obtaining an unbiased photon mapping at a small extra cost drawing method. Furthermore, a set of weights for multiple importance sampling is further developed to combine the unbiased photon mapping method with bidirectional ray tracing techniques. The method of the invention has high efficiency and reliability. The wide application of the method of the invention is expected to reduce the cost of image rendering and drawing in animation, film, advertisement and construction industries.

Description

technical field [0001] The invention relates to the technical field of graphic drawing, in particular to a photon mapping drawing method. Background technique [0002] The relevant research background of the present invention is briefly described as follows: [0003] 1. Photon mapping [0004] The core idea of ​​photon mapping is to use the density of photons to estimate local light energy. For details, please refer to JENSEN, H.W.2001. Realistic Image Synthesis Using Photon Mapping. A.K.Peters, Ltd., Natick, MA, USA. The locality of photon collection makes this method particularly effective for challenging caustics and indirect lighting with multiple bounces. In addition, photon mapping can reuse the optical path corresponding to the photon, thereby reducing the cost of sampling. Density estimation can effectively reduce noise, but it also introduces bias to the final result, so all previous photon mapping methods are biased. Although the latest series of progressive ph...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T15/06
Inventor 侯启明秦昊孙鑫周昆
Owner ZHEJIANG UNIV
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