Radiosity Methods Driven by Human Perception
Radiosity Methods Driven by Human Perception
复制标题
由人类感知驱动的光能传递方法
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
J. Přikryl
中科院分区：
文献类型：
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作者：
J. Přikryl
尽管光能传递方法在研究人员中很受欢迎，但与其他全局照明方法相比，它仍然存在一些缺点。通常实施的光能传递方法使用基于辐射值的标准来驱动计算-以决定足够的网格质量或估计模拟过程的误差，并决定何时可以安全地终止模拟。当用户对辐射量的实际值感兴趣时，这对于辐射模拟的情况是绝对正确的。另一方面，光能传递方法经常仅用于为人类观察者生成图片，这些图片并不要求是正确的物理模拟结果，它们只需看起来相同即可。在某些情况下，关于人类视觉性能和视觉信号处理的研究结果可以被构建到图像合成算法本身中，并且保证不会花费任何努力来计算对人类观察者来说只是微不足道的改变。在图像处理领域，感知误差度量用于图像比较和图像编码，使得能够更好地预测两个图像之间的差异，而不是感知上不合适且广泛使用的均方误差度量。从图像合成中已知的色调再现操作符使得能够以这样的方式将图像亮度的明亮标度映射到CRT亮度的窄标度上，使得感知的CRT图像产生与原始图像相同的心理图像。存在感知驱动的光能传递算法，其使用各种方法来控制定义正被渲染的场景的有限元网格的最佳密度，以仅将可见的间断线包括到该网格中，并预测该方法的收敛。我们将描述蒙特卡罗辐射传递的分层扩展，该扩展仅在从观察点直接可见的区域保持解的高精度。我们还将对与视图无关的蒙特卡罗辐射传递版本的不同感知和辐射终止标准进行比较。
Despite its popularity among researchers the radiosity method still suffers some disadvantage over other global illumination methods. Usual implementations of the radiosity method use criteria based on radiometric values to drive the computation — to decide about sufficient mesh quality or to estimate the error of the simulation process and to decide when the simulation can be safely terminated. This is absolutely correct for the case of radiometric simulation, when the user is interested in actual values of radiometric quantities. On the other hand, the radiosity method is very often used just to generate pictures for the human observer and those pictures are not required to be the results of correct physical simulations, they just have to look the same. The results of research on human visual performance and visual signal processing can be built into the image synthesis algorithm itself under some circumstances and guarantee that no effort will be spent on computing changes that are only marginally important for the human observer. In the area of image processing, perceptual error metrics are used for image comparison and image coding that enable to better predict the differences between two images as opposed to the perceptually inappropriate and widely used meansquared error metrics. Tone reproduction operators known from image synthesis make it possible to map a bright scale of image luminances onto a narrow scale of CRT luminances in such a way that the perceived CRT image produces the same mental image as the original image. Perceptually-driven radiosity algorithms exist, which use various methods to control the optimum density of the finite-element mesh defining the scene that is being rendered, to include only visible discontinuity lines into this mesh, and to predict the convergence of the method. We will describe an hierarchical extension to the Monte Carlo radiosity that keeps the accuracy of the solution high only in the area immediately visible from the point of observation. We will also present a comparison of different perceptual and radiometric termination criteria for a view-independent version of Monte Carlo radiosity.
影响因子：
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作者：
LEGGE, GE;FOLEY, JM
通讯作者：
FOLEY, JM