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Analysis of Hough Data Behavior for Scene Recognition
Kazuki Ueno,Jun’ichi Yamaguchi 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
In this paper, the authors describe on an analysis of Hough data behavior for recognition of three dimensional scene. First, the relation between the change of shooting conditions and the behavior of Hough data was investigated, using the perspective transformation of lines. The investigation result cleared that the behavior shows a characteristic pattern and keeps three dimensional information of lines. Next, a work on a scene image verification is explained. In the study, we describe on Hough data verification using Matched filter. In this paper, the behavior of Hough data is explained in detail and a test of the scene image verification is shown.
Convergent Floating Thresholding Method
Tomoko Fujidai,Kazuhiro Kunishi,Jun’ichi Yamaguchi 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
In this paper, the authors propose a method for thresholding a gray-scaled image. In the method, a threshold for a coordinate is set by an iteration that is composed of the pixels detection from neighboring area and a calculation of a candidate threshold using the detected pixels. The candidate threshold settles down to a value, because the detected pixels finally become invariable. Therefore, the method can set the threshold which follows up a light changing and a contrast changing. The proposed method and the conventional methods were tested, using a preceding car images. We compared the method with other methods by an estimation based on a correlation on the thresholding. It was confirmed that the proposed method had more effectiveness than the conventional methods in case of brightnes change, contrast fall and image size change.