Illumination analysis for synthetic/natural hybrid image sequence generation

J. Stauder
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引用次数: 4

Abstract

For virtual studio TV production, multi-site videoconference applications using a virtual meeting room and for synthetic/natural hybrid coding according to the forthcoming ISO/MPEG-4 standard, a synthetic and a natural scene are mixed to generate a synthetic/natural hybrid image sequence. For realism, the illumination in both scenes should be identical. The illumination of the natural scene is estimated automatically and applied to the synthetic scene. For illumination estimation, moving real objects are segmented in the natural image sequence and 3D modeled. The 3D shape, 3D motion and the displaced frame difference between two succeeding images are evaluated to estimate three illumination parameters. The parameters describe a distant point light source and ambient light. Using the estimated illumination parameters, the synthetic scene is rendered and mixed to the natural image sequence. Experimental results with a moving virtual ball mixed automatically into a real video telephone sequence show that virtual objects appear naturally having the same shading and shadows as the real person.
合成/自然混合图像序列生成的光照分析
对于虚拟演播室电视制作,使用虚拟会议室的多站点视频会议应用以及根据即将发布的ISO/MPEG-4标准的合成/自然混合编码,合成场景和自然场景混合以生成合成/自然混合图像序列。为了写实,两个场景中的照明应该是相同的。自动估计自然场景的照度并应用于合成场景。对于照明估计,运动的真实物体被分割成自然图像序列和三维建模。通过对连续两幅图像的三维形状、三维运动和位移帧差进行评估来估计三个照明参数。参数描述了远点光源和环境光。利用估计的光照参数,将合成场景渲染并混合到自然图像序列中。将移动的虚拟球自动混入真实视频电话序列的实验结果表明,虚拟物体自然呈现出与真人相同的阴影和阴影。
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