Hardware Design And Realization Of Laser Electronic Whiteboard

The work of this paper focuses on design and realization in hardware part of the laser electronic whiteboard. It studies the location method of the laser electronic whiteboard and realizes basic function of laser electronic whiteboard.The laser electronic whiteboard adopt the method of laser scanning for tracking the writing pen. It supports colorized pens writing and erasing. It is provided with real-time performance and high precision.Electronic whiteboard is the modern equipment which will replace the traditional blackboard and chalk. It is the renovation of the old teachering and meeting mode. Which embodies digital processing, multimedia, long-distance education, netmeeting and overcomes disadvantage of the traditional means, electronic whiteboard is perfect choice of the Computer Aided Education. Nowadays, blackboard is still main tools of teaching in primary schools, middle schools, and colleges. But the dust which the chalk carries may affect teachers and students' health. The general whiteboard solves the problem, but same to the blackboard, it can not capture and save pictures and words on the board. As the electronic whiteboard appears, this sort of whiteboard solve the problem capturing and saving handwriting on board, in this way, students attending class and people who take part in conference do not needed to note anything strenuosity, thereby, the electronic whiteboard has sufficient application in America and Europe. In our country, the electronic whiteboard has sufficient application in lots of classrooms, auditoriums and hotels in recently years.Now, there are the scanning electronic whiteboard, the touching electronic whiteboard, and the electronic whiteboard based on wireless location and so on. The wireless location electronic whiteboard based on ultrasonic signal has many advantages, but this type electronic whiteboard is easily interfered by aculeated sound signal because the frequency of the ultrasonic signal the frequency is lower. Yet, the laser signal is infrequently interfered. The laser whiteboard based on laser signal as location signal have high precision, real-time performance and good stability.Cooperated with calibrating system, the laser electronic whiteboard uses two laser scanners to scanning the writing pen or eraser and utilizes the reflecting laser to obtain the scanner angle of the two laser scanner, then uses the two scanner angle to calculate the pen's or eraser's coordinate. The main work and contents are summed up as follows. The dissertation consists of seven chapters. In chapter one, it is summarized that the electronic whiteboard's development history and actuality all over the world, and the significance of exploiting laser electronic whiteboard and laser electronic white board's configuration have been introduced. In chapter two, some methods about near field's and far field's location have been introduced, the location algorithm of laser electronic whiteboard has been explained in detail.In chapter three, the design of the writing system and calibrating system has been summarized, identifying the information of writing pen's color and eraser also has been introduced.In chapter four, the constitution of laser scanning system has been introduced. Then the system of laser emission and the system of laser receive has been explained in detail.In chapter five, according as the main function of each part of the hardware, the design and realization of the hardware has been analyzed in especially. In chapter six, the realization of the algorithm of the electronic whiteboard using DSP has been introduced. The result's error of calculation, the software of DSP and monolithic processor have been discussed respectively.In chapter seven, it is summarized that the contribution and deficiency of the system.The main contribution of this paper is listed as follow:â…  The electronic whiteboard actuality on domestic and overseas is summed up, the location methods and sorts on near field and far field are summarized. â…¡ It...