60-50 Hz video signal conversion method - choosing unselected frame from remaining sequence of three frames by scanning second full picture

摘要

The 60 Hz video signal is obtained by scanning electronically a film with 24 pictures per sec. In this way a first film picture with two video frames (part frames) and a second film picture, preceding or following it, with three video frames (part frames), are scanned and, from these, from a cycle of frames of the 60 Hz video signals a cycle in the same time of fewer frames of the 50 Hz video signals is formed. From a sequence of five successive frames of the 60 Hz video signals, corresponding to two film pictures, four frames are selected for the 50 Hz video signals. The unselected frame is chosen from the remaining sequence of three frames by scanning the second full picture. The four selected frames for each sequence are arranged according to the correct sequence of row jumps or frames and according to the direction of the sequence of the full picture sequence. ADVANTAGE - Improved quality.