A study on digital painting by using BRDF

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(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.