| 摘要 |
<p>A method and apparatus for low-delay conversion of 3:2 pulldown video to progressive format with field averaging is disclosed. The method considers 3:2 pulldown interlaced video that represents a four-frame motion picture film sequence as a ten-field interlaced video field sequence of three, two, three, two video fields per motion picture frame respectively for the four-frame sequence. One step of the method is the step of creating a ten-frame progressive video frame sequence, having a delay of approximately one field time with respect to the ten-field interlaced video sequence. This step is achieved by combining at one field time intervals a top field and a bottom field from the ten-field interlaced video sequence, where, at the time of combination, the top field and the bottom field are the most recently available top and bottom fields corresponding to the same motion picture film frame. The method comprises the further step of substituting, for the top field or the bottom field in the combining step, an average of that top or bottom field and the field two fields prior, when that top or bottom field and the field two fields prior correspond to the same motion picture film frame. Apparatus for performing the above method includes a multiplexer (80) that accepts an input video signal, a two-field-time delayed signal, and a signal that represents the average of these two. The multiplexer (80) outputs a send field and a store field that meet the criteria described above. The send field and a one-field-time delayed version of the store field are combined to produce a progressive frame. <IMAGE></p> |
