| 摘要 |
PURPOSE:To sharply shorten processing time as compared to an ordinary method for executing the contraction processing of all picture element including white picture elements by executing the contraction processing of only black picture elements in an original pattern. CONSTITUTION:One byte out of original pattern data supplied to a register is stored in the register 1. A mask data table 3 outputs data in an address 8 in its initial state and the outputted data and the data held in the register 1 are supplied to an AND gate 2. The output of an AND gate 2 is impressed to a priority encoder 4, the position of the most significant '1' bit of the input data is detected by the encoder 4 and a position code is outputted. The position code is applied to a register 5 and the output of the register 5 is sent to a multiplier 6 to execute contraction processing. Since the existence of black picture elements is detected and the contraction processing is executed only when black picture elements are included, the contraction processing can be executed within an extremely short period as compared to the ordinary method. |
