文字の見え方評価方法

概要

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With respect to characteristics of eyes, a large number of studies have been done from standpoints of physiology, psychology, psychology physics and engineering etc. In field of image science and technology, the researches on image quality or fidelity are reported already. However, a subject for appearance of characters requires visual experiment. In this paper, an evaluation method for appearance of characters is devised without directly depending on the visual experiment. A visual cell of the retia is regarded as the array of a photoelectric element with a equivalent size. The measuring method is also proposed by the characters which are sampled on the photoelectric array. In case a lot of cells is stimulated, we consider four cells around a center cell. When four pieces receive stimulation, the cell at the center will not contribute to an outline formation. This cell is named F cell. On the other hand, 1 piece or any more surroundings of the center cell do not receive stimulation, the center cell is named C cell. If it is assumed that number of cells which receive stimulation is N_E, number of C cells is N_C and number of F cells is N_F, the following expression is established. N_E=N_C+N_F It is concluded that the suitable ratio N_F/N_E is 0.5 as an evaluation standard of characters.
福山大学の論文