| 摘要 |
Circuitry for reducing flicker in lines and contours in television pictures supplied in an interlaced sequence of scanning values grouped in fields (A, B). In a first signal-processing branch (7), the television pictures are assigned a (field) repetition frequency twice that of an input signal. In a second signal-processing branch (8), equivalent pixels of consecutive lines of the fields are derived from the scanning values and assigned mean valves. A selection arrangement comprises a first field correlator (21), in which equivalent pixels of consecutive fields are compared, and a second field correlator (22), in which the same pixels of one of these fields are compared with the equivalent pixels of the adjacent line of the same pixels of another of these fields. In a signal-inversion stage (20), an inverted signal is derived from signals supplied by the field correlators (21, 22) and constituting a measure of the movements between the successive fields (A, B) of a television picture. In an inversion stage (15), an output signal in the form of a linear combination of signals assigned by the signal-processing branches (7, 8) is derived from the inverted signal. |
