Field interpolation method determination device
AssigneePanasonic Corporation
InventorTakayuki Kimoto
Life of this patent
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Abstract
Correlation of videos between fields is determined between a difference between an input interlaced signal and a signal that is delayed by one field with respect to the input interlaced signal. Correlation among N-1 sequential fields is compared with a predetermined pattern to determine whether the input interlaced signal is unquestionably a telecine-converted signal, whether it is unquestionably not a telecine-converted signal, or whether it cannot be said to be unquestionably a telecine-converted signal. If a determination of being unquestionably a telecine-converted signal is continued for a predetermined number or more of fields, an instruction signal, which instructs to perform inter-field interpolation on the input interlaced signal, is outputted.
Claims14
A field interpolation method determination device (6,8a) for determining whether to perform either an inter-field interpolation method or an intra-field interpolation method on fields of an inputted interlaced signal (Vin) to provide conversion to a progressive signal (Vpr), the device comprising:
- pixel level difference detection means (6,81) for detecting a pixel level difference (SpA) between the input interlaced signal (Vin) and a 1-field delay input interlaced signal (Vd1) obtained by delaying the input interlaced signal (Vin) by one field;
- field correlation detection means (6,81,82,83,84) for detecting correlation between the input interlaced signal (Vin) and the 1-field delay input interlaced signal (Vd1) based on the pixel level difference (SpA), and outputting inter-field correlation determination signals (Df);
- inter-field correlation storage means (85,86,87,88) for storing N-1 inter-field correlation determination signals (Df:R1,R2,R3,R4) corresponding to N sequential fields of the input interlaced signal;
- field/frame correlation determination means (89,90) for determining, based on a pattern of values (R1,R2,R3,R4) of the N-1 inter-field correlation determination signals, whether the N sequential fields are either 2-2 or 2-3 pulldown-converted;
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- interpolation method determination means (91) for determining, as an interpolation method, inter-field interpolation if the fields are determined to have been either 2-2 or 2-3 pulldown-converted, or intra-field interpolation if the fields are determined to have been neither 2-2 nor 2-3 pulldown-converted.
Dependencies are inferred from the claim text.