抄録
This paper proposes a method that obtains a high-tone images from the ultra-low-tone image using the spatial features. Those areas are smoothed when the adjacent tone value of attention area is continuous. On the other hand, those areas save as an edge when the adjacent tone value of attention area is discontinuous. From this premise, that attention area can be classified into six patterns by each area. And, the low-gradation image is changed into a highly-gradating image by processing with each pattern. As a result of the comparative experiments, the proposed method was better quantitatively and visually than existing methods. The proposed method can change ultra-low-tone image into naturally-Highly-gradating image.
