25 October 2016 Design and algorithm research of high precision airborne infrared touch screen
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Proceedings Volume 10157, Infrared Technology and Applications, and Robot Sensing and Advanced Control; 1015703 (2016) https://doi.org/10.1117/12.2243753
Event: International Symposium on Optoelectronic Technology and Application 2016, 2016, Beijing, China
Abstract
There are shortcomings of low precision, touch shaking, and sharp decrease of touch precision when emitting and receiving tubes are failure in the infrared touch screen. A high precision positioning algorithm based on extended axis is proposed to solve these problems. First, the unimpeded state of the beam between emitting and receiving tubes is recorded as 0, while the impeded state is recorded as 1. Then, the method of oblique scan is used, in which the light of one emitting tube is used for five receiving tubes. The impeded information of all emitting and receiving tubes is collected as matrix. Finally, according to the method of arithmetic average, the position of the touch object is calculated. The extended axis positioning algorithm is characteristic of high precision in case of failure of individual infrared tube and affects slightly the precision. The experimental result shows that the 90% display area of the touch error is less than 0.25D, where D is the distance between adjacent emitting tubes. The conclusion is gained that the algorithm based on extended axis has advantages of high precision, little impact when individual infrared tube is failure, and using easily.
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Xiao-Bing Zhang, Shuang-Jie Wang, Yan Fu, Zhao-Quan Chen, "Design and algorithm research of high precision airborne infrared touch screen", Proc. SPIE 10157, Infrared Technology and Applications, and Robot Sensing and Advanced Control, 1015703 (25 October 2016); doi: 10.1117/12.2243753; https://doi.org/10.1117/12.2243753
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