School of Physics and Electronic Technology;
Hubei University;
Wuhan 430062;
Hubei;
China;
Graduate School of Information Sciences;
Tohoku University;
Sendai 980-8579;
Miyagi;
Japan;
School of Computer;
Wuhan University;
Wuhan 430072;
Hubei;
China;
digital image processing; image restoration; image edge analysis; image boundary analysis; point spread functions;