Shadow detection and removal for traffic images

J. M. Wang, Y. C. Chung, C. L. Chang, S. W. Chen

研究成果: 書貢獻/報告類型會議貢獻

73 引文 斯高帕斯(Scopus)

摘要

Shadow detection and removal is an important task when dealing with outdoor images. Shadows cast by objects together with the objects form distorted figures. Furthermore, separate objects can be connected through shadows. Both can confuse object recognition systems. In this paper, an effective method is presented for detecting and removing shadows from foreground figures. We assume that foreground figures have been extracted from the input image by some background subtraction method. A figure may contain an object with or without shadow or multiple objects connected by shadows. To begin, we decide whether there are shadows in a given figure. A method based on illumination assessment is developed for this purpose. Once shadows have been confirmed existing in the given figure, their locations and orientations are estimated. A number of points are then sampled from the shadow candidates, from which attributes of shadow are computed. We do not remove shadows simply based on the computed attributes. The reason is twofold. First, the distribution of intensity within a shadow is not uniform. Second, shadows can be divided into cast and self shadows; only cast shadows are to be removed. To deal with the first issue, we recover object shapes progressively instead of directly removing shadows. The second issue is resolved based on the observation that self shadows possess denser distributions of texture than cast shadows in our application. A number of experiments have been performed. The results revealed the applicability of the proposed technique.

原文英語
主出版物標題Conference Proceedings - 2004 IEEE International Conference on Networking, Sensing and Control
頁面649-654
頁數6
出版狀態已發佈 - 2004 六月 28
事件Conference Proceeding - 2004 IEEE International Conference on Networking, Sensing and Control - Taipei, 臺灣
持續時間: 2004 三月 212004 三月 23

出版系列

名字Conference Proceeding - IEEE International Conference on Networking, Sensing and Control
1

其他

其他Conference Proceeding - 2004 IEEE International Conference on Networking, Sensing and Control
國家臺灣
城市Taipei
期間04/3/2104/3/23

    指紋

ASJC Scopus subject areas

  • Engineering(all)

引用此

Wang, J. M., Chung, Y. C., Chang, C. L., & Chen, S. W. (2004). Shadow detection and removal for traffic images. 於 Conference Proceedings - 2004 IEEE International Conference on Networking, Sensing and Control (頁 649-654). (Conference Proceeding - IEEE International Conference on Networking, Sensing and Control; 卷 1).