Bachelor of Science, Kyushu University, Fukuoka, 1964. Master of Science, Kyushu University, 1969. Doctor of Philosophy, Kyushu University, 1977.
Assistant professor Kyushu University, Fukuoka, 1971—1974, associate professor, 1981—1988, professor department informatics, 1996—2007, professor emeritus, since 2007. Associate professor Fukuoka Women's University, 1974—1981. Professor Kyushu Institute of Technology, Iizuka, 1988—1996.
Visiting professor department mathematics Cornell University, Ithaca, New York, 1985—1986.
Member of Institute of Electrical and Electronics Engineers Signal Processing.
Married Kazuyo Matsuo Niijima, May 24, 1970. Children: Koji, Satoshi.