Sharpening method for picture

Abstract

Abstract PURPOSE:To sharpen various pictures by finding the character of the picture from an interval between the change points of picture element density, using a differentiation operator in an optimum size corresponding to this interval and executing differentiation processing. CONSTITUTION:After picture data 1 are stored in a picture memory 2, based on the contents of these data, a size determining circuit 3 determines the size of the differentiation operator and applies this size to a differentiating circuit 4. According to the differentiation operator in the applied size, the circuit 4 executes differentiation processing to the picture data in the memory 2 and outputs the result of this processing as output data 5. The change points shown by the density of respective picture elements are found and the interval between these change points is determined. Then, the size of the differentiation operator is determined corresponding to the interval between the change points with the maximum appearance frequency. Thus, the differentiation operator of a determined digital Laplacean is applied to the differentiating circuit 4 and the differentiation processing is executed.

Inventors

• 👤 Hiroyuki Okada
• 👤 浩行 岡田

Bibliographic Details