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Virtual brush model input stereo vision Acquisition Methodology

Author: ZhangZuo
Tutor: ShiLin
School: Kunming University of Science and Technology
Course: Applied Computer Technology
Keywords: Virtual Brush Model Input Acquisition Multi - camera Fusion
CLC: TP391.41
Type: Master's thesis
Year: 2010
Downloads: 21
Quote: 0
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Abstract

The brush is a unique writing instruments, has the highest value in Chinese culture and art history. Soft brush tip, the artist in the process of writing, by mentioning that, according to Dayton, folding and other rhythmic brushstrokes and turn the pen, will be able to draw out the ever-changing, highly expressive strokes, expressive rich The high degree of difficulty of control is difficult to achieve any other writing instruments. In today's digital era, people began envisaged can brush rich expressiveness to the digital realm, inherited this great art at the same time, also to be further developed, but due to the soft brush pen point, how much ink, paper material and so on will affect the effect of writing, and The brushwork varies quite a lot of the writing process, writing slightly afterburner or rotating pen tilt the pen body, fast Yunbi, Dayton pen will have a variety of different effects, so in order to digitized brush writing not only to establish a virtual brush model, but also a good way to get the input of the virtual brush model. Virtual Brush Model input to obtain the following methods: 1, to obtain a pressure-sensitive pen writing in the electronic board. [1] This method is able to obtain the plane coordinates of the pen tip and writing the pressure exerted on the tip, but it is hard brush to simulate writing brush and brush a soft nib distinction between large, apparently not good Get Yunbi process. 2, by the pen into a six degree of freedom (DOF) force feedback device in the pen moves to get. [3] This method is through the six degrees of freedom of the force feedback device to receive the user's brush, and feedback to the user pressure, it is able to obtain three-dimensional coordinates of the document, but the document is inserted in the force feedback device writing inconvenient. brush writing process, writing brush control is very subtle, force feedback device is difficult to simulate. And force feedback device price is quite expensive. 3, through the the real brush tops ultrasound signal (Ultrasound Buzzer) and gyroscopes (Gyroscope), installed on the display of the three ultrasonic receiving means (Ultrasound Receivers) to obtain. [13] [14] This method is by means of an ultrasonic receiving apparatus, receiving the information from the ultrasonic signal the position of the brush in the three-dimensional space, by gyroscope capture the rotation information of the brush, it is possible to more accurately obtain the rotation of the brush to the three-dimensional coordinates and pen, tilt and other sports, but also because it is written with a real brush users more realistic writing, but its drawback is tied up in a brush on the ultrasonic signal and the gyroscope greater weight will affect writing by writing. The user, on the basis of the above analysis to obtain a more natural and real brush input method: Camera computer stereo vision calculated using the method of virtual brush input to obtain a specific color label affixed real brush work platform on real paper to write two calibrated cameras record writing process from different angles on the working platform, and then split the two cameras for video clips of the frame sequence, calculated each color labels on the image position of the mark point in the frame, by a stereoscopic method fusion two cameras access corresponding to the same time frame, the image of the mark point position, so as to obtain the three-dimensional position of the point of these flags, and then through the three-dimensional positions of these mark points the changes to obtain the state of motion of the brush in the entire process of writing, and finally get a persistent store digitized described in a series of motion parameters of the writing process, the writing process can be digitized as a virtual input of the brush model. This paper completed the following work: 1, defines a method to obtain a virtual brush model input stereo vision. Real writing process, the method to get the input of the virtual brush model, which allows the user to input more realistic approach, simply quote some of the labels on the brush, and will not affect the writing, and because the real writing, we will get the writing process real ink brush model assessment is valuable. 2, to study a variety of algorithms for stereo vision method to obtain virtual brush model to use to enter the entire process, including a single frame on looking for signs point algorithm; different cameras in the same time frame sequences corresponding frame to find the corresponding point on the algorithm; signs point space the position Restore algorithms; access to the state of motion algorithms that solve the main problems of the various stages of the brush pen moves state visual measurement method. 3, the development of a prototype test environment from a brush writing process to obtain the digitization process description file and displayed through the process of a visualization program.

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