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Illumination modeling method based on real material measurement data

A technology of measuring data and modeling methods, which is applied in image data processing, 3D image processing, instruments, etc., can solve the problems of not reflecting the characteristics of BTF materials well, and the rough surface of BTF materials, so as to achieve real data and good results Effect

Active Publication Date: 2016-08-10
SHANDONG UNIV
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AI Technical Summary

Problems solved by technology

Although the method of using the BRDF reflection model to fit the BTF measurement data has a very high compression rate, due to the rough surface of the BTF material, it will present visual effects such as self-occlusion, self-shadowing, and mutual reflection, so the BRDF fitting is directly performed on the BTF measurement data , often introduces a lot of noise values, and the fitted BRDF analytical model does not reflect the characteristics of the BTF material well.

Method used

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  • Illumination modeling method based on real material measurement data
  • Illumination modeling method based on real material measurement data
  • Illumination modeling method based on real material measurement data

Examples

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Embodiment 1

[0089] The selected material is used as the plane material to be collected, and the data is captured by a photorealistic material measurement device in camera light source array mode. The measuring device includes a workbench, on which a shooting bracket is fixed, and the shooting bracket includes a semicircular arc camera fixed arm, a semicircular arc light source rotating arm and a central rotating tray, and multiple cameras are mounted on the camera fixing arm, The fixed arm of the light source is provided with a plurality of light sources; the shooting bracket and the workbench are controlled by computer serial port programming.

[0090]By measuring camera shooting, the pitch angle of the material in the viewing angle is 0° to 90° (interval 15°), the azimuth angle is 0° to 360° (interval 15°), and the direction of the light source is 0° to 90° (interval 15°). ), the azimuth angle is from 0° to 360° (interval 15°).

[0091] Step 1. For the captured pictures, after multiple...

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Abstract

The invention discloses an illumination modeling method based on real material measurement data, comprising a data pre-processing part and a data fitting part. Targeting the fact that a BRDF model is only limited to fit an overly simple plane material, the measurement data of a BTF material is decomposed into geometric information and illumination information, and the illumination information is utilized to perform BRDT fitting. In order to improve the current status that the current BRDT fitting method of the BIF overlooks the effects of self-shielding, self-shadow, mutual reflection, etc, to directly perform the BRDF fitting, the illumination modeling method utilizes the obtained normal and depth geometric information to eliminate ineffective shielding and shadow data of the BTF measurement data before performing BRDF fitting, and thus provides an illumination model fitting algorithm having a more real visual effect. Compared with other BRDF models, the BRDF fitting based on the micro-surface has a better fitting effect.

Description

technical field [0001] The invention relates to an illumination modeling method based on real material measurement data. Background technique [0002] In recent years, with the development of computer graphics, animation, film and television, advertising and other fields have higher and higher requirements for rendering. It is increasingly difficult for traditional analytical reflection models to meet the requirements of animation and film and television industries. Based on real material measurement The research and use of data is more and more extensive, how to obtain the most realistic rendering effect has become the main research direction of computer realistic graphics. The lighting attribute modeling of materials is to accurately display the appearance and visual effects of objects under different lighting conditions. Due to the diversity of materials and the complexity of the causes of light reflection, the modeling of material surface lighting attributes has always b...

Claims

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Application Information

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IPC IPC(8): G06T15/50
CPCG06T15/506
Inventor 徐延宁王璐徐安敏孟祥旭徐翔龚斌
Owner SHANDONG UNIV
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