A novel criterion for quality improvement of JPEG images based on image database and re-application of JPEG. - Katsuya Kohno; Akira Tanaka; Hideyuki Imai (APSIPA, 2012)

Multi-Frame Image Denoising Based on Minimum Noise Variance Convex Combination with Difference-Based Noise Variance Estimation. - Akira Tanaka; Katsuya Kohno (IEICE Trans. Fundam. Electron. Commun. Comput. Sci., 2013)