A process for the superimposition of a background - image signal into parts of a foreground - picture signal and circuit for carrying out this method

摘要

A process for the superimposition of a background - image signal into by a predetermined key color kc fixed parts of a foreground - picture signal, wherein wipes in the transition regions between the image signals in dependency upon a control signal (k) and the transformation of in the transition regions in the foreground - image signal occurring between colors in new between colors, the transition from the color of the foreground - image signal to the direction of the background - picture signal form, are carried out, wherein the control signal (k) in the region of the key color has a first value and on via gear limits a second value is obtained, wherein the limits by means of gear in the c_b/C._r-Color plane representing the selectivity by two lines through the origin are formed, which with the vector of the key color (kc) each an angle (α_L or α_R) , characterized in that the lines through the origin (sel representing the selectivity_L or sel_R) by changing the angle (α_L or α_R) within the duration of one frame can be switched over, and in that the switching of the selectivity by means of a masks signal takes place, which can be switched within a picture line.