Video processing to convert between field rates
AssigneeSnell & Wilcox Limited
InventorsPeter Wilson, Martin Weston, Steve Dabner
Life of this patent
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Abstract
A method for converting between relatively close field rates of perhaps 60 Hz and 59.94 Hz, monitors the phase difference between input and output field rates. Initially, output fields are created by synchronizing input fields. As the measured phase passes a threshold, the method switches to interpolation mode for a short, fixed interval and then returns to synchronization. The method offers much of the sharpness associated with simple synchronization but avoids the visible discontinuities of field drops or repeats.
Claims6
A method of converting a video signal between formats having field rates of respectively F and F+/−Δ per second, wherein fields are synchronized in a synchronization mode over a first portion of a time interval 1/Δ and temporally interpolated in an interpolation mode over a second portion of said time interval 1/Δ which second portion extends over more than one field.
Dependencies are inferred from the claim text.