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Light field projection method used for scene illumination recovery

A scene and projection technology, applied in the field of virtual reality, can solve problems such as low spatial resolution and poor lighting accuracy, achieve high spatial and angular resolution, low device requirements, and easy to achieve effects

Inactive Publication Date: 2014-11-19
BEIHANG UNIV
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Problems solved by technology

The above methods use LEDs or a small number of projectors as light sources. The obvious disadvantage of this method is that the accuracy of the reproduced light is poor and the spatial resolution is very low.

Method used

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  • Light field projection method used for scene illumination recovery
  • Light field projection method used for scene illumination recovery
  • Light field projection method used for scene illumination recovery

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Embodiment Construction

[0031] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0032] The lighting sampling data used in this method is the photometric map of the real scene. The photometric map is a high-dynamic panorama, which describes the incident lighting situation at the sampling position of the photometric map. Each pixel on the map represents a sampling ray, and the pixel The value is the light intensity, and the light direction is determined by the panoramic model of the photometry map, usually using the perspective map panoramic model. A pair of photometric maps records the incident light conditions of a sampling location at a point in time, select several sampling points for the original scene, and sample a set of photometric map sequences on the time axis at each sampling point to complete the comparison. Spatial dynamic light field data acquisition of raw scenes.

[0033] The light detection map obtained by sampling ...

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Abstract

The invention discloses a light field projection method used for scene illumination recovery, and belongs to the technical field of virtual reality. In the method, a device adopting a projector and a lens array is designed to perform the light field projection, light field data is converted into a light field to perform projection, and the scene illumination is recovered. The method comprises the following specific steps: firstly, converting a sampled optical measurement image sequence into the four-dimensional light field expression of the scene illumination; then, clustering point light sources on a light source plane, generating projection sub-images for all the point light sources clustered, and performing distortion correction and image stitching; finally, after geometric calibration and luminance calibration, adopting a projector to project the projected images on the lens array, and refracting light rays on the other side through lenses to form a plane light field, so as to recover the illumination of an original scene. The illumination recovered by adopting the method has higher realness, higher space freedom degree and higher practicability. The method is applicable to the illumination application fields such as video and film special effects and stage lighting control.

Description

technical field [0001] The invention relates to a method for recovering scene illumination and a light field projection device, and belongs to the technical field of virtual reality. Background technique [0002] Lighting has always been an important topic in computer graphics research. Realistic lighting plays an important role in expressing the authenticity of objects and scenes. Realistic lighting technology is widely used in industrial fields such as game animation, film and television special effects, and stage lighting. [0003] From traditional lighting based on virtual light sources to image-based lighting, lighting technology continues to develop in a more efficient and realistic direction: the geometric information and light emission characteristics of virtual light sources are relatively simple, and it is difficult to reproduce the complex lighting of real scenes; Image lighting technology uses image data such as environment maps to extract lighting information to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06T5/00G06T5/50G09F19/18F21V5/04F21W131/403
Inventor 赵沁平周忠邱晓峰余涛
Owner BEIHANG UNIV
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