| 摘要 |
PURPOSE:To facilitate succeeding recognition processings, by detecting peaks on a basis of the density distribution in the direction of the horizontal axis which is cut by a prescribed rate of the width of a five staff and grouping information into independent notes, groups of notes, and symbols in accordance with the number of peaks. CONSTITUTION:Density data of one-record components of musical score is read optically, and a density curve 2 in the direction of the horizontal axis is converted to a density distribution curve 3 in a direction Y of the vertical axis. For example, 80% of a maximum value Xmax of the curve 3 is used as a threshold, and this threshold X0 is used to cut a quantity Y0 for X0 of the curve 2, and thus, a density distribution curve 4 only for note information of notes, bar lines is attained. This density data on the score attained in this manner is sampled and measured at intervals of a prescribed time to determine a peak value of the histogram. An independent tone is discriminated in case of one peak, and a symbol is discriminated when the interval between two peaks is <=2/3 of a five staff width GP, and a group of notes is discriminated when two or more peaks exist and the interval between adjacent peaks is >2/3 of the five staff width GP. |
