标题：A Novel ROI Extraction Method and Its Application
作者：Zhang, Ling; Yin, Lixin; Li, Zhen
作者机构：[Zhang, Ling; Yin, Lixin; Li, Zhen] Shandong Univ, Dept Informat Sci & Engn, Jinan 250100, Shandong, Peoples R China.
会议名称：International Symposium on Image Analysis and Signal Processing
会议日期：APR 11-12, 2009
来源：PROCEEDINGS OF INTERNATIONAL SYMPOSIUM ON IMAGE ANALYSIS & SIGNAL PROCESSING, 2009
关键词：on-line marking; ROI; wavelet transform; interaction variance; feature; extraction
摘要：ROI extraction is the basic work of computer online marking. A method of ROI extraction is proposed in this article. It initially uses the wavelet transform to detect edge, and locate the rough location to obtain the first extracted subimage which contains the ROI, then it takes advantage of the best global threshold, morphological operation, and ergodic search method to determine the exact location to obtain the ROI. The experimental results demonstrate that the method is intuitive, reliable and has a good adaptive extraction effect that can be applied to different style answer-sheet images.