He is a tenured professor of image engineering, and director of Institute of Media Cognition and Intelligent System.
He has published more than 20 textbooks and 30 papers on educational topics.
His research interests are mainly in the area of Image Engineering that includes image processing, image analysis and image understanding, as well as their applications. He is an enthusiastic promoter of this new discipline. Since 1996, he has made (for 21 consecutive years) a survey series of yearly bibliographies on Image Engineering in China, the results are published both nationally and internationally.
He is also an active researcher in various domains of Image Engineering, with current interests on object segmentation from images and video, segmentation evaluation and comparison, moving object detection and tracking, face recognition, facial expression detection/classification, content-based image and video retrieval, information fusion for high-level image understanding, etc.
He was and is in charge of a number of projects from National Nature Science Foundation, National High Technology Projects, Ministry of Education, etc.
He has published extensively in Image Engineering and related areas, with nearly 500 research papers, three Chinese monographs: "Image Segmentation" and "Content-based Visual Information Retrieval" (Science Press), and "Subspace-based Face Recognition" (Tsinghua University Press), one dictionary: "An English-Chinese Dirctionary of Image Engineering" (1st edition and 2nd edition) (Tsinghua University Press), one book combining teach and research materials: "A Selection of Image Engineering Techniques" (Tsinghua University Press), as well as three edited English books: "Advances in Image and Video Segmentation"(IRM Press, USA), "Semantic-Based Visual Information Retrieval" (IRM Press, USA), and "Advances in Face Image Analysis: Techniques and Technologies " (IGI Global, USA).