A Method for High Precision Enlargement of Pictures taken by Cellular Phone on Personal Computer

In this paper, we propose a method to enlarge and display images of picture with high precision and scalability taken by cellular phone on personal computer without producing jaggy noises. One of the major problems we face in image enlargement is the amplification of the jaggy edges. To deal with this problem, we first detect the edges, and approximate them using three kinds of functions including straight line, arc and quadratic curve. In addition, the color information of the enlarged image is determined by interpolation using quadratic Fluency DA function, which is subsequently merged with the edge information obtained earlier. This enables the construction of a high precision and scalable image that cannot be produced by conventional image coding method such as JPEG or MPEG. The proposed method is evaluated by applying to images taken by cellular phone equipped with CCD camera to demonstrate its effectiveness.

[1]  Kazuo Toraichi,et al.  Periodic spline orthonormal bases , 1988 .

[2]  K. Mori,et al.  High quality image restoration by adaptively transformed sampling function , 1999, 1999 IEEE Pacific Rim Conference on Communications, Computers and Signal Processing (PACRIM 1999). Conference Proceedings (Cat. No.99CH36368).

[3]  Yoshinori Mitamura,et al.  Two variables compactly supported fluency sampling functions-based scalable conversion for fundus photograph , 2003, 2003 IEEE Pacific Rim Conference on Communications Computers and Signal Processing (PACRIM 2003) (Cat. No.03CH37490).

[4]  I. J. Schoenberg.  Cardinal Spline Interpolation , 1987 .

[5]  C. E. SHANNON,et al.  A mathematical theory of communication , 1948, MOCO.

[6]  Sang Joon Kim,et al.  A Mathematical Theory of Communication , 2006 .