1. S. S. Yu and W. H. Tsai (1991). "Thinning method for gray-scale images," Republic of China Patent, No. 044614, 1991/02/01. (PDF)

2. S. S. Yu and W. H. Tsai (1993). "Neural network for implementing relaxation," Republic of China Patent, No. 060223, 1993/01/01. (PDF)

3. S. S. Yu and W. H. Tsai (1993). "Neural network for performing a relaxation process," U. S. A. Patent, No. 5274744, 1993/12/28. (PDF)

4. S. L. Chou and W. H. Tsai (1995). "On-line handwritten Chinese recognition method ," Republic of China Patent, No. 072737, 1995/08/01. (PDF)

5. R. Y. Wu and W. H. Tsai (1995). "Single-pass parallel thinning method and system," Republic of China Patent, No. 070328, 1995/03/21. (PDF)

6. R. C. Lo, H. W. Chang and W. H. Tsai (2000). "Tracking of positions and orientations for pose determination in virtual reality," Republic of China Patent, No. 113742, 2000/02/21. (PDF)

7. W. H. Tsai, C. Y. Yang and S. S. Huang (2001). "Automatic document editing system and method," Republic of China Patent, No. 145390, 2001/11/11. (PDF)

8. S. H. Chen and W. H. Tsai (2002). "A compression method for documents," Republic of China Patent, No. 168212, 2002/12/01. (PDF)

9. C. J. Wu and W. H. Tsai (2007). “Landmark-based vehicle location system and its technique,” Republic of China Patent, No. I274971, 2007/03/01. (PDF)

10. Y. C. Chuang, W. H. Tsai, and Y. C. Tsai (2007). “Method for protecting content of vector graphics formats,” U. S. A. Patent, No. US 2007/0147655 A1, 2007/06/28 (PDF); US 7831060 B2, 2010/11/09. (PDF)

11. Y. C. Chuang, W. H. Tsai, and Y. C. Tsai (2007). “Method for protecting content of vector graphics format,” Republic of China Patent, No. I288892, 2007/10/21. (PDF)

12. K. F. Chien, W. H. Tsai, and C. J. Wu (2010). “Video surveillance system and video encoding method based on data hiding,” Republic of China Patent, No. I330341, 2010/09/11. (PDF)

13. C. J. Wu, S. Y. Tsai and W. H. Tsai (2012). “Automatic ultrasonic and computer-vision navigation device and method using the same,” U. S. A. Patent, No. 8,116,928 B2, 2012/02/14. (PDF)

13. C. J. Wu, S. Y. Tsai and W. H. Tsai (2012). “Automatic navigation device using ultrasonics and computer vision and its navigation method” Republic of China Patent, No. I408397, 2012/11/27. (PDF)

14. C. W. Lee and W. H. Tsai (2015). “Method for embedding secret message into PNG image,” U. S. A. Patent, No. US 8,949,610 B2, 2015/02/03. (PDF)

15. Y. T. Kuo and W. H. Tsai (2015). “Scene imaging method using a portable-two-camera omni-imaging device for human-reachable environments,” U. S. A. Patent, No. US 0,084,408 A1, 2014/03/27. (PDF)

16. Y. L. Lee and W. H. Tsai (2015). “A new data hiding method via revision history records on collaborative writing platforms,” Republic of China Patent, No. I499928, 2014/03/27. (PDF)

17. Y. L. Lee and W. H. Tsai (2015). “Data hiding method via revision records on a collaboration platform,” U. S. A. Patent, No. 14522033, 2015/11/12. (PDF)

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