Highly compressed 3D digital archives by illuminating DCT modulated pattern light.

本研究是基于图像绘制(IBR)的一种扩展，用于表示虚拟环境中真实物体的镜面效果。物体的照片捕捉由几个物理组件组成的图像；它的形状、颜色、纹理、镜面反射度和照明条件。这项研究的目的是研究如何保持物体的镜面反射度，这是相当敏感的照明条件。在混合现实世界中，需要将虚拟物体叠加到真实场景上，以协调光度一致性。许多照明设备通常由灯泡或LED等光源组成。为了再现动态光环境，它必须实时地调整光源的数量及其位置以适应当前的光环境。为了克服这一实施困难，我们建议使用LCD面板，而不是作为图像显示设备，而是作为LCD的背光照明设备。在本研究中，我们开发了一种新的照明装置“LCD Cube”，它由六个内向式LCD组成，以保持光度的一致性。该系统可以对放置在LCD立方体中心的物体再现任意的光环境。为了避免由于摄像机动态范围较小而导致图像质量下降，我们提出了通过改变摄像机的电子曝光时间来捕获多幅图像的想法：通过混合这组图像来生成高动态范围的光环境。作为演示，我们提出了在基于图像的照明中用“LCD Cube”来显示高动态范围光环境的方法。此外，在本研究中，我们提出了一种高动态范围光环境再现的方法，以避免由于CCD摄像机和LCD显示器的动态范围而导致的图像质量下降。此外，我们还进行了光再现，这是一个实时传输系统的光环境与“LCD立方体”。

This research has resulted an extension of Image-Based Rendering (IBR) to represent the specularity of a real object in a virtual environment. A photo of an object captures an image consisting of several physical components; its shape, color, texture, specularity and the lighting condition. This research is intended as an investigation of how to preserve the specularity of an object, which is considerably sensitive to the lighting condition. In the Mixed Reality world, it needs to overlay virtual objects onto real scene with harmonizing the photometric consistency. Many illumination devices usually consist of light sources like light bulbs or LEDs. For reproduction dynamic light environments, it has to adapt the number of light sources and their positions to the current light environments in real-time. To overcome this implemental difficulty, we suggested using LCD panel not as image display device but as illumination device with backlight of LCD. We have developed a new illumination device "LCD cube" for keeping photometric consistency in this research, which is consisting of six inward-pointing LCDs. The system can reproduce arbitrary light environments to the object which is placed at the center of "LCD cube". In order to avoid degrading the image quality due to lower dynamic range of CCD camera, we have produced an idea to capture several images by changing the electronic exposure time of the camera: it generates the high dynamic range light environments by mixing the set of images. As demonstrating, we have presented the method to display high dynamic range light environments by "LCD cube" for Image-Based Lighting. Also, in this research, we have proposed the method for high dynamic range light environments reproduction to avoid degrading the image quality due to dynamic range of CCD camera and LCD display. In addition, we have performed a light reproduction that is a real-time transmission system of light environments with "LCD cube".