JPS57187761A - Pattern extraction method - Google Patents

Abstract

PURPOSE:To make storing of picture signals of all coordinate unnecessary to extract easily a pattern in the inside white picture part, which is surrounded with an outside black part, with a small-capacity storage part, by calculating boundary point coordinates and areas for every point or every line. CONSTITUTION:The picture surface is scanned in every line by a read line sensor 1 to output a picture signal corresponding to white and black of the pattern on the picture surface, and the analogue signal is made binary by a binary circuit 2 and is supplied to a picture processor 3 through a data bus. A read pulse is supplied from an oscillator 4 to not only the processor 3 but also an X-axis coordinate counter 5 for the calculation of a current point coordinate value, and the carry signal of the counter 5 is inputted to a Y-axis coordinate counter 6. Outputs of counters 5 and 6 are inputted to the processor 3, and the directional linkage of black and white bits of the input picture is discriminated in the processor 3 on a basis of the control of a program part 7, and required data are stored in a component storage part 8, an area storage part 9, a color storage part 10, and an outside coordinate storage part 11 respectively on a basis of the discrimination result.