DIALOG TYPE GRAPHIC INPUT DEVICE

PURPOSE:To enable an accurate and efficient analog type graphic input work, by feeding partial patterns successively while observing a reference drawing displayed on a monitor TV and then superposing both patterns for display. CONSTITUTION:The picture information of a reference drawing is converted into video electric signals via a TV camera 41 and then stored in a reference picture memory 44 via a binary coding circuit. Then the reference drawing is fed to a screen memory 31 of a pattern display 3 from a pattern converter and then displayed on a monitor TV30 via a picture forming circuit 33. Then an operator feeds a partial pattern through a dialog input control device while observing the reference drawing. The partial pattern is fed to a screen memory 32 via a pattern processor 21 of a pattern input device 2 and an input pattern memory 22 and then superposed on the reference drawing on the monitor TV30. In such a way, the dialog input work can be easily carried out with high efficiency and without any error.