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A brdf color gamut mapping method based on directional statistical analysis

A technology of color gamut mapping and statistical analysis, applied in the field of BRDF color gamut mapping based on directional statistical analysis, which can solve the problems of complex extraction and large amount of pre-calculation.

Active Publication Date: 2020-04-21
NANJING UNIV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

At the same time, the extraction of its attributes is also more complicated, so the amount of pre-calculation is relatively large

Method used

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  • A brdf color gamut mapping method based on directional statistical analysis
  • A brdf color gamut mapping method based on directional statistical analysis
  • A brdf color gamut mapping method based on directional statistical analysis

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Experimental program
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Embodiment Construction

[0059] This embodiment provides a BRDF color gamut mapping method based on directional statistical analysis, such as figure 1 shown, including the following steps:

[0060] (1) Collect the BRDF of the ink of the target device and decompose it into a diffuse reflection part and a specular reflection part.

[0061] The BRDF of the target device ink can be collected with a conventional gonior reflectometer. Assuming that the target device has K types of inks, it is necessary to obtain K BRDF functions ρ k (ω o ,ω i ), k=(1,2,...,K). where ω i and ω o are the direction of the incident light and the direction of the viewpoint, respectively.

[0062] The BRDF of a general material contains two components: diffuse reflection and specular reflection. In order to carry out quantitative statistical analysis conveniently, especially in order to calculate the spherical distance, the present invention first converts any BRDF ρ(ω o ,ω i ) is decomposed into the diffuse reflection ...

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Abstract

The present invention discloses a BRDF color gamut mapping method based on directional statistical analysis. The method comprises: acquiring the BRDF of target device ink; extracting diffuse reflectance, high light reflectance and a scatter matrix of the target device ink; forming a BRDF color gamut of the target device; extracting diffuse reflectance, high light reflectance and a scatter matrix of the source BRDF; according to the set weight, using the secondary planning method optimization to map the source BRDF to the BRDF color gamut of the target device; and obtaining the final BRDF mapping result. The method disclosed by the present invention is simple in calculation and low in memory consumption, and allows the user to adaptively control by adjusting the weight.

Description

technical field [0001] The invention relates to the field of material appearance management in computer graphics, in particular to a BRDF color gamut mapping method based on directional statistical analysis. Background technique [0002] In the field of computer graphics and computer vision, the bidirectional reflectance distribution function (BidirectionalReflectance Distribution Function, BRDF) is generally used to model the reflective properties of non-transparent single materials. This is a four-dimensional function that depends on the direction of the incident light and the direction of the viewpoint, reflecting the ratio relationship between the micro-increment of irradiance in the incident direction and the micro-increment of reflected radiance caused by a fixed incident point on the surface of the material . [0003] During the 3D material printing process, the material reflection properties of the target device ink determine the range of reproducible materials, whi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06T15/50
CPCG06T15/506
Inventor 过洁潘金贵
Owner NANJING UNIV