| 摘要 |
PURPOSE:To reduce the throughput of an arithmetic operation by computing distance to a picture element where the next edge point exists in a prescribed direction such as upward/downward or rightward/leftward at every whole picture elements of all the pictures, and recording distance information on memory. CONSTITUTION:A distance arithmetic part which computes the edge point detected at an edge point detection circuit 3 and the distance to each picture element uses, for example, a binary counter 6. The memory 7 such as frame memory which stores the distance information for each picture element found by the counter 6 is provided. Thence, the distance to the picture element where the next edge point exists is computed in the prescribed direction such as upward/downward or rightward/leftward, etc., at every whole picture elements of all the pictures, and the distance information is recorded on the memory 7. Therefore, a coordinate value in which the next edge point exists can be obtained by performing one time of addition or subtraction. Thereby, it is possible to find out the edge point from which connection can be started with high efficiency. |
