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Optical Engineering

Electronic whiteboard construction using whiteboard and image-locating techniques
Author(s): Wen-Yuan Chen; Jing-Wein Wang; Chin-Ho Chung
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Paper Abstract

We use image-locating techniques and a traditional whiteboard with two cameras to construct an electronic whiteboard (EWB) with a size of 88×176 cm corresponding to 1280-×1024-pixel resolution. We employ two strategies achieve the goal: (1) we develope a modified scale and bilinear interpolation (MSBI) method for pen locating and acceleration operation, and obtain high accuracy detection; and (2) a block parameter database (BPD) is created to improve the accuracy. For the BPD, we divide the whiteboard image into several blocks and record each block parameter (the X and Y coordinates) to follow pen position calculation. Experimental results demonstrate that the MSBI method can correctly calculate the pen position. Additionally, the BPD strategy is better than the traditional method as it improves the accuracy and decreases the maximum detection error from 6 to 3 pixels. The simulation results prove our method is an effective and low-cost EWB technique.

Paper Details

Date Published: 1 November 2009
PDF: 10 pages
Opt. Eng. 48(11) 117202 doi: 10.1117/1.3258345
Published in: Optical Engineering Volume 48, Issue 11
Show Author Affiliations
Wen-Yuan Chen, National Chin-Yi Univ. of Technology (Taiwan)
Jing-Wein Wang, National Kaohsiung Univ. of Applied Sciences (Taiwan)
Chin-Ho Chung, Ta Hwa Institute of Technology (Taiwan)


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