Interpolator for television special effects system
First Claim
1. A method of processing a first pair of input data words representing two adjacent pixels on a first line of a first field of a video signal in interlaced format, a second pair of input data words representing two adjacent pixels of a first line of a second field of the video signal, said second field being the field that occurs immediately after said first field, and a third pair of input data words representing two adjacent pixels of a second line of the second field, where the first and second lines of the second field are adjacent lines in that field and the first line of the first field is between the first and second lines of the second field, the positions on their respective lines of the pixels represented by the second and third pairs of input data words corresponding to the positions on the first line of the first field of the pixels represented by the first pair of input data words, and the method comprising reading the first, second and third pairs of data words from memory, providing an indication of whether motion is present in the region of the frame in which the pixels represented by the second pair of input data words appear, and interpolating among the input data words of the first, second and third pairs to generate an output data word, the relative contributions to the output data word of the three pairs of input data words being dependent upon whether motion is indicated.
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Abstract
A first pair of input data words represent two adjacent pixels on a first line of a first field of a video signal in interlaced format, a second pair of input data words represent two adjacent pixels of a first line of a second field of the video signal, and a third pair of input data words represent two adjacent pixels of a second line of the second field. The first and second lines of the second field are adjacent lines in that field and the first line of the first field is between the first and second lines of the second field. The positions on their respective lines of the pixels represented by the second and third pairs of input data words correspond to the positions on the first line of the first field of the pixels represented by the first pair of input data words. The first, second and third pairs of data words are read from memory, and are processed by interpolating among them to generate an output data word. The relative contributions to the output data word of the three pairs of input data words depend on whether an indication is provided that there is motion in the region of the frame in which the pixels represented by the second pair of input data words appear.
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Citations
12 Claims
- 1. A method of processing a first pair of input data words representing two adjacent pixels on a first line of a first field of a video signal in interlaced format, a second pair of input data words representing two adjacent pixels of a first line of a second field of the video signal, said second field being the field that occurs immediately after said first field, and a third pair of input data words representing two adjacent pixels of a second line of the second field, where the first and second lines of the second field are adjacent lines in that field and the first line of the first field is between the first and second lines of the second field, the positions on their respective lines of the pixels represented by the second and third pairs of input data words corresponding to the positions on the first line of the first field of the pixels represented by the first pair of input data words, and the method comprising reading the first, second and third pairs of data words from memory, providing an indication of whether motion is present in the region of the frame in which the pixels represented by the second pair of input data words appear, and interpolating among the input data words of the first, second and third pairs to generate an output data word, the relative contributions to the output data word of the three pairs of input data words being dependent upon whether motion is indicated.
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7. A method of processing a video signal in interlaced format, comprising writing first, second and third pairs of input data words representing respective pixels in a frame of the video signal into memory, the pixels represented by the first pair of input words being adjacent pixels on a first line of a first field of the video signal, the pixels represented by the second pair of input words being two adjacent pixels on a first line of a second field of the video signal, the second field being the field that occurs immediately after the first field, and the third pair of input words representing adjacent pixels on a second line of second field, where the first and second lines of the second field are adjacent lines in that field and the first line of the first field is between the first and second lines of the second field, the positions on their respective lines of the pixel represented by the second and third pairs of input words corresponding to the positions on the first line of the first field of the pixels represented by the first pair of input words, and the method also comprising reading the first, second and third pairs of input words from memory, obtaining an indication of whether motion is present in the region of the frame in which the pixels represented by the second pair of input data words appear, and interpolating among the input words of the first, second and third pairs to generate an output word, the relative contributions to the output word of the three pairs of input words being dependent upon whether motion is indicated.
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8. A method of processing a first pair of input data words representing two adjacent pixels on a first line of a first field of a video signal in interlaced format, a second pair of input data words representing two adjacent pixels of a first line of a second field of the video signal, said second field being the field that occurs immediately after said first field, and a third pair of input data words representing two adjacent pixels of a second line of the second field, where the first and second lines of the second field are adjacent lines in that field and the first line of the first field is between the first and second lines of the second field, the positions on the second line of the second field of the pixels represented by the third pair of input data words corresponding to the positions on the first line of the second field of the pixels represented by the second pair of input data words, and the positions on the first line of the first field of the pixels represented by the first pair of input data words each being within one inter-pixel pitch of the positions on the first line of the second field of the pixels represented by the second pair of input data words, the method comprising reading the first, second and third pairs of data words from memory, providing an indication of whether motion is present in the region of the frame in which the pixels represented by the second pair of input data words appear, and interpolating among the input data words of the first, second and third pairs to generate an output data word, the relative contributions to the output data word of the three pairs of input data words being dependent upon whether motion is indicated.
- 9. Apparatus for processing first, second and third pairs of input data words representing respective pixels within a frame of a video signal in interlaced format, the pixels represented by the first pair of input data words being adjacent pixels on a first line of a first field of the video signal, the pixels represented by the second pair of input data words being adjacent pixels on a first line of a second field of the video signal said second field being the field that occurs immediately after said first field, and the third pair of input data words representing adjacent pixels on a second line of the second field, where the first and second lines of the second field are adjacent lines in that field and the first line of the first field is between the first and second lines of the second field, the positions on the respective lines of the pixels represented by the second and third pairs of input data words corresponding to the positions on the first line of the first field of the pixels represented by the first pair of input data words, the apparatus comprising means for providing an indication of whether there is motion present in the region of the frame in which the pixels represented by the second pair of input data words appear, interpolator means for interpolating among the first, second and third pairs of input data words to generate an output data word, and adaptive means for adjusting the relative contribution to the output data word of the three pairs of input data words in dependence upon whether motion is detected.
Specification