A study on digital painting by using BRDF

(1)数字绘画颜料混合的实时仿真利用光谱测量仪获得的颜料反射率，提出了一种颜料混合模型。使用我们的模型，可以生成足够的颜色混合，这在以前的模型中是不可能的。我们通过基本减色混合的概念、Kubelka-Munk的理论和Duncan的理论提出了一个颜料混合模型。我们还提出了一个交互式绘画工具，作为我们的数字颜料模型的应用。结合(2)的结果，我们可以实现一个数字艺术的互动创作平台。(2)交互式数字图像查看与编辑平台提出了一种基于图像的无标记人脸检测器的交互式图像查看器“ViewFrame2”。房间的窗户被LCD或其他平面屏幕取代，该系统显示的是观察者可以看到的依赖于视图的CGI场景。该系统需要实时响应用户的动作；因此，通过GPU的像素着色器功能来实现图像处理，以加快处理速度。该系统通过自然的人机交互，使图像深度识别和三维形状识别成为可能。我们还提出了一种技术，“光线照到的地方就是应用效果的地方”。通过将光线照射在屏幕的突出区域，或相反地制造阴影，用户可以动态地选择图像处理的区域。因此，用户可以同时暴露屏幕，也可以只暴露狭窄的区域进行精细处理。

(1)Real-time pigment mixture simulation for digital paintingWe propose a pigment mixing model by using the reflectivities of pigments which are obtained by a spectrum measuring instrument. With our model, it is possible to generate adequate color mixtures that are impossible to make in previous model. We propose a pigment mixing model by means of a concept of a basic subtractive color mixing, the Kubelka-Munk's theory, and the Duncan's theory. We also propose an interactive painting tool as an application of our digital pigment model. By combining the result of (2), we can implement an interactive creation platform for digital art.(2)Interactive digital image viewing and editing platformAn interactive image viewer, "ViewFrame2", by means of image-based face detector without marker is proposed. A window in a room is replaced with a LCD or another flat screen, and this system displays view-depended CGI scenery that would be seen from an observer. This system is required to react to user's action in real time ; therefore the image processing is implemented by means of pixel-shader functions for GPU to accelerate the process. This system makes it possible to recognize the depth of image and three-dimensional shapes easily by natural man-machine interaction. We also propose a technique that "Where the light shines on is where effect is applied". By means of shine the light on the ex gratia area of a screen, or make a shadow by contraries, users can select the area dynamically where the image is processed. Therefore, users can expose the screen at the same time, or expose only narrow area to process at fine level.