PROCESSING SYSTEM FOR CONVERSION OF PROJECTION

PURPOSE:To realize the high efficiency for the converting work of projection for a system in which a center projection image is converted into an orthographic projection image, by using the converting parameter that is given when an orthographic projection contour diagram into a center projection ocntour diagram. CONSTITUTION:For an orthographic projection contour diagram, the central visual point which is used when the orthographic projection contour is converted into a center projection contour side is defined as an original point. At the same time, the optional coordinates (x) and (y) of the orthographic contour diagram are stored in registers 6 and 7, and the height (h) of these coordinates is stored in a register 8 respectively. The distance H between the visual point of the center projection and the reference height surface is stored in a register 9. (H-h) is delivered through a subtractor 10, and H/(H-h) is obtained at the output of a divider 11. The output of the divider 11 is supplied to multipliers 12 and 13 as the multiplier to be multiplied by the contents (x) and (y) of the registers 6 and 7 to deliver Hx/(H-h) and Hy/(H-h). These outputs are stored in registers 14 and 15 in the form of coordinates X and Y that received the conversion of projection.