Using Human Objects for Illumination Estimation and Shadow Generation in Outdoor Environments

In computer graphics and augmented reality applications, the illumination information in an outdoor environment enables us to generate a realistic shadow for a virtual object. This paper presents a method by which to estimate the illumination information using a human object in a scene. A Gaussian m...

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Bibliographic Details
Published in:Symmetry (Basel) 2019-10, Vol.11 (10), p.1266
Main Authors: Han, Sung-Ju, Shin, Jun-Sup, Kim, Kyungnyun, Lee, Sang-Yoon, Hong, Hyunki
Format: Article
Language:English
Subjects:
Augmented reality
Cameras
Computer graphics
Global positioning systems
GPS
Ground plane
Illumination
illumination estimation
Methods
Noise
outdoor environment
Probabilistic models
shadow generation
Shadows
stereo camera
Virtual reality
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Summary:In computer graphics and augmented reality applications, the illumination information in an outdoor environment enables us to generate a realistic shadow for a virtual object. This paper presents a method by which to estimate the illumination information using a human object in a scene. A Gaussian mixture model, in which the mixtures of Gaussian distributions are symmetrical, is employed to learn the background. The human object is then segmented from the input images and the disparity map obtained by a stereo camera. The ground plane in the scene, which is important for estimating the location of the human object on the ground, is then detected using the v-disparity map. The altitude and the azimuth value of the sun are computed from the geometric relationship of three scene elements: the ground, human object, and human-shadow region. The experimental results showed that the proposed method can estimate the sun information accurately and generate a shadow in the scene for a virtual object.
ISSN:2073-8994
2073-8994
DOI:10.3390/sym11101266