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Television-scan-line-doubler-including-temporal-median-filter

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Television scan line doubler including temporal median filter

Details

Inventors: Campbell, Jack J.; Faroudja, Yves C.; Lyon, Thomas C.;
Assignee: Faroudja; Yves C. (Sunnyvale, CA)
Primary Examiner: Kostak; Victor R.
Assistant Examiner:
Attorney, Agent or Firm: Harrison; David B.

A video pixel interpolator generates interpolation pixels from incoming picture image pixels for use within a television picture scan line doubler system. The interpolator includes a temporal median filter for generating an interpolation pixel by selection of the median one of a plurality of temporal pixel samples derived from incoming video, an intra-field averager means for generating an intra-field pixel average, and a switch connected to switch an input to a line doubler of the system between outputs of the temporal median filter and the intra-field averager in response to detection of pixel motion within the picture image. Improved motion detection, and multi-channel processing are also included within the present invention.

DETAILED DESCRIPTION WITH OBJECTS A general object of the present invention is to provide an improved method and apparatus for television scan line doubling and display which includes a temporal median filter for pixel interpolation in a manner which overcomes limitations and drawbacks of the prior art.
A more specific object of the present invention is to include a temporal median filter within an inter-field line doubler for a line doubled television display so as to eliminate the double imaging artifact otherwise occurring in prior art inter-field interpolation processes in the presence of motion in the field to field picture content.
Another specific object of the present invention is to provide an improved motion detector for proportional controlling an interpolator for a television scan line doubler which normally interpolates pixels on the basis of median values derived in the temporal domain and which switches to spatial domain pixel interpolation in the presence of detected motion within the video picture.
One more specific object of the present invention is to provide an improved interpolator for a television scan line doubler which switches incrementally from a temporal median filter output to a spatial interpolation value in relation to amplitude of a motion value derived from the motion activity in the vicinity of the pixel to be interpolated.
In accordance with the present invention, a television line doubler doubles the number of scan lines available for display upon a television display device.
The line doubler includes a temporal median filter which is connected to receive simultaneously and select and put out the median one as an interpolation pixel F1i in a one field delayed F1 field, the interpolation pixel F1i being selected from a group including an actual pixel value from a present field F0, a pixel average value in the F1 field of F1(a+B)/2 wherein a is the pixel in the scan line above the pixel i location and b is the pixel in the scan line below the pixel i location, and an actual pixel value from a two field delayed field F2

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