| 摘要 |
PURPOSE:To input a target picture into the center of a reference window exactly and automatically in the beginning of tracking, and also to prevent a cumulative shift in the course of tracking, by switching and using an ROM in which a reference picture is written in advance, and an RAM which is capable of freely updating the reference picture. CONSTITUTION:In the beginning of tracking, a reference picture from an ROM 15, passing through a switching circuit 16 is set to a reference position of a reference window, a correlation operation against a target picture from an image pickup sensor 5, a reference window 9 and a picture data memory 12 is executed by a correlation operating circuit 13, and the target picture is inputted into around the center of the reference window even in case of a high speed target. Subsequently, when a switch 16 is switched, tracking is executed in accordance with the reference picture which is updated and written in order in an RAM 11, and as a result of operation by the circuit 13, when the correlativity drops, a position shift is corrected again in accordance with correlation against contents of the ROM 15. In this way, in the beginning of tracking, the reference picture is inputted into the center of the reference window exactly and automatically, and also the cumulative position shift in the course of tracking is prevented. |
