Television – Format conversion – Line doublers type
Patent
1997-02-12
1999-07-27
Harvey, David E.
Television
Format conversion
Line doublers type
348458, H04N 701
Patent
active
059299185
ABSTRACT:
An interpolation filter for video signals includes four circuits to improve video quality in both intra-field and inter-field modes. The interpolation filter is configured to interpolate according to the direction of an image edge. The interpolation filter is also configured to interpolate in a prescribed spatial direction when no image edges can be univocally determined. The first circuit detects an image edge of discrete image elements to generate a first signal. The second circuit uses output from the first circuit to generate a first signal corresponding to an average of the discrete image elements along a direction of the image edge. The third circuit uses output from the first circuit to detect a texture image area wherein an image edge cannot be univocally determined and for generating a second signal depending on a degree of existence of the image edge. The fourth circuit is supplied by the first signal, the second signal and a third signal. The fourth circuit generates an output signal obtained by combining the first signal with the third signal in a proportion dependent upon the second signal. Additionally, the fourth circuit is configured for multiplexing to selectively couple the third signal to a fourth signal, corresponding to an average of the discrete image elements along a prescribed direction, or to a fifth signal corresponding to a previously received image element value.
REFERENCES:
Tero Koivunen and Jouni Salonen, "Motion estimation using combined shape and edge matching", Signal Processing Image Communication 6(3): 241-252, 1994.
Mancuso Massimo
Marques Pereira Ricardo Alberto
Poluzzi Rinaldo
Carlson David V.
Harvey David E.
Johnson Brian L.
SGS-Thomson Microelectronics S.R.L.
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