电子工程系

Department of Electronic Engineering 

 

Changsong LIU, Ph.D. Associate Professor

Department of Electronic Engineering, Tsinghua University, Beijing 100084, China

Tel: +86-10-62772368

Fax: +86-10-62772369-211

E-mail: lcs@tsinghua.edu.cn

 

Education background

Ph.D., Electronic Engineering, Jan. 2007

Tsinghua University, Beijing, China

Master of Science, Electronic Engineering, July 1995

Tsinghua University, Beijing, China

Bachelor of Engineering, Electrical Engineering + Engineering Mechanics, June 1992

Tsinghua University, Beijing, China

 

Experience

12/2002-present Associate Professor, Dept. of Electronic Engineering,  Tsinghua Univ.

04/1995-11/2002 Lecture and Assistant Professor, Dept. of Electronic Engineering,Tsinghua Univ.

 

Concurrent Academic

Graduate

Digital Image Processing (2003~2010

 

Social service

CONFERENCE

ICDAR 2011

ACADEMIC ORGANIZATION

Member, IEEE

Reviewer, Image and Vision Computing Journal, Elsevier

Reviewer, Pattern Recognition, Elsevier

 

Areas of Research Interests/ Research Projects

Printed and Handwritten Character Recognition

Image Processing

Nature Language Processing

Embedded System and Application

 

Research Status

1. Tsinghua-Nokia Joint Research Program, “Handwriting and image recognition”, May. 2008-May. 2010, Project Leader.

         The objective of the project is the development and optimization of the continuous Chinese multi-character HWR algorithm, development handwritten mathematical expression calculator, and some research on human face location and recognition. The handwritten mathematical expression calculator is selected and pre-installed on many new Nokia brand mobile phones.

2. Hi-tech Research and Development Program of China (National 863 Project), “Comprehensive platform for intelligent Chinese information processing” Jan. 2001-Dec. 2003, Principle Investigator.

         The objective of the project is to improve Chinese OCR and handwritten character recognition performance and build some related applications. The result include an Asia language OCR engine which is licensed by Microsoft in there Office 2003 product, an online handwritten recognition engine which is used widely on many PDAs and mobile phones, and serval other systems.

3. National Science Funding, China, “Using style consistency information between characters to improve the character recognition system performance ”, Jan. 2008-Dec. 2010, Principle Investigator.

         There are relations between the shape of one character with another in the same sentence or paragragh, We research on how to modelling these kind of information and use it improve character recognition.

4. Microsoft Cooperation, “Online handwritten character recognition for Tablet PC platform”, 2007, Principle Investigator.

         The project produced a new full screen handwritten words and sentence recognition and result editing method and a demo system. The key problems resolved were using dictionary and language model to get good string recognition accuracy and invent a efficient way to edit the result.

 

Honors And Awards

National Science and technology progress award, Second prize 3 times at 1999, 2004, 2008, China Goverment

Academic Achievement

[1] Junxia Gu, Changsong Liu, Xiaoqing Ding, Kongqiao Wang, "Segmentation and recognition system of handwritten chinese bank check amounts", CHINESE JOURNAL OF ELECTRONICS, Vol.17, No.1, JAN 2008, pp.37-42

[2] Xiaolu Shen, Changsong Liu, Xiaoqing Ding, "Text line extraction in free style document", Proceedings of SPIE-IS and T Electronic Imaging - Document Recognition and Retrieval XVI、January 2009

[3] Yu Zhang, Changsong Liu, Xiaoqing Ding, Yanming Zou, "Arbitrary warped document image restoration based on segmentation and thin-plate splines", 19th International Conference on Pattern Recognition, Dec. 2008

[4] Changsong Liu, Xiaoqing Ding, "Study of Character Recognition Using Writing Style Consistent", ACTA AUTOMATICA SINICA, Vol.33, No.11, 2007, pp.1121-1127

[5] Junqing Shang, Changsong Liu, Xiaoqing Ding, "OCR result optimization based on pattern matching", Document Recognition and Retrieval XIV, Jan 30-Feb 1 2007, pp.650009

[6] Junqing Shang, Changsong Liu, Xiaoqing Ding, "Lossy JBIG2 based on optical character recognition", JOURNAL OF TSINGHUA UNIVERSITY(SCIENCE AND TECHNOLOGY), Vol.46, No.7, 2006, pp.1247-1249, 1253

[7] Changsong Liu, Xiaoqing Ding, "Automatic style clustering of printed characters in form images" Proceedings of SPIE , v 5676, 2005, p175-182

[8] Zhengbin Yao, Xiaoqing Ding, Changsong Liu, "On-line handwritten Chinese word recognition based on lexicon", 18th International Conference on Pattern Recognition (ICPR'06), 2006, pp. 320-323

[9] Xuewen Wang, Xiaoqing Ding, Changsong Liu, "Gabor filters-based feature extraction for character recognition", Pattern Recognition, Vol.38 , 2005, pp.369-379