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Computer drawing of the painting

Author: LiNing
Tutor: WangLiXin
School: East China Normal University
Course: Software Engineering
Keywords: non-photorealistic rendering image-based rendering Chinese ink painting inkdiffusion mean shift
CLC: TP391.41
Type: Master's thesis
Year: 2008
Downloads: 102
Quote: 0
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Abstract


The Chinese ink wash drawing has a history of about one thousand years. One of the most challenging work in the computer art research field is to simulate thetraditional paint media and tools. The representation of normal Chinese painting is different from that of Chinese landscape painting, which is of complicated brushwork. The research on the graphical simulation of Chinese landscape painting is beneficial to the development of Chinese painting and computer art.Non-Photorealistic Rendering (NPR) has been a research hotspot of Computer Graphicssince the medium term of 1990s. It injects aesthetic and stylized elements into computer graphics,and the goal of NPR is not to render objects realistically but creatively, such as in simulatingvarious painting styles. By NPR, the artists can convey not only abstract information but also acertain artistic spirit through simulating various artistic styles.At present, many kinds of artistic style paintings, such as watercolor painting, pencilsketching, pen-and-ink illustration, canvass, etal., have been simulated successfully. Chinese inkpainting is a kind of traditional art forms in China which has a history more than three thousand years. It adopts four main tools: the hairy brush, ink stick, paper and ink stone. In Chinese inkpainting, the artist doesn’t care about producing an exact or literal reproduction, but expressingonly the essence of the considered objects. In other words, paintings typically consist of just a fewsimple strokes intended to convey the artist’s deep feelings regarding the painted object. Simplicityis therefore a key ingredient. And feelings are expressed by the speed, placement, pressure, andmovement of the brush, as well as the resultant degree of shading produced by the brush strokes. To simulate Chinese ink painting is not only to inherit our excellent traditional culture, but also todevelop a new NPR technology.The simulation of Chinese ink painting has gone through a course from simplicity tocomplexity, and now we can use the pen input devices to create Chinese ink paintings on thecomputer in real-time. However, all the systems ask for the users who wish to draw a satisfiedpicture with some certain painting skills. Without background experience about painting, thispaper presents a system for user, who can convert a color image to a picture with Chinese inkpainting effect automatically. As we known, ink is an important pigment to paint a Chinese ink painting, and the variousgray effects on the painting are produced by ink mixed with water. In addition, the ink diffusionalong the stoke edges is a very important aspect of Chinese ink painting. In order to realize theeffects described above, we present a painting method based on an input color image. At first, we use mean shift to filter and segment the image, and after we change the image to gray scale, the similar gray effect of an ink painting is shown Then, we can detect the segmented regions’ edges,let the edge points to be the start points for diffusion. We can set each point an ink value whichcorresponding to its gray value. The third step is to diffuse the ink from the edges. Since the fibersof the absorbed paper is the main cause for ink diffusion, so if we look the image as a 2D grids,and each pixel is a grid, and we allocate each grid some fibers randomly, we can achieve theabsorbed rate of each grid. Then we simulate the ink diffusion on the paper as follows:The experimental results illustrate that our methods are promising.

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Information processing (information processing) > Pattern Recognition and devices > Image recognition device
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