Sequential digital video frames are divided into two interleaved fields comprising even-numbered horizontal lines of pixels and odd-numbered lines horizontal lines of pixels respectively. The "even" field of a first standard frame is combined with the "odd" field of a second standard frame to form...http://www.google.co.uk/patents/US5850264?utm_source=gb-gplus-sharePatent US5850264 - Pseudo interlacing in digital video
