Importance

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Abstract

Converting 24 frame per second film source material to 60 fields per second video involves converting one film frame into either two or three video fields using a repeating 3:2 field pattern, referred to as a 3:2 pulldown. When one film frame is made into three video fields, there will be a redundant video field. Once the source material has been transferred to video, the video is edited and distributed. When compressing video that was originally film source, the presence of the duplicate fields results in sub optimal compression. The highest efficiency compression can be achieved when the redundant fields are skipped and the frame rate is returned to that of the original film source. Thus, an inverse 3:2 pulldown, is necessary to identify and remove the redundant video fields before the video is compressed. To identify the redundant video fields, a method and apparatus is disclosed that generates motion vectors and error displacements for adjacent video fields. The motion vectors and error displacements are analyzed and a determination is made whether the video fields are redundant.

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First Claim