Sub-nyquist sampling encoder and decoder of a video system
First Claim
1. A sub-Nyquist sampling encoder comprising:
- means for thinning out pixels from a sampled video data signal in accordance with a predetermined rule;
a plurality of interpolation means for interpolating a pixel thinned out by said thin-out means by using non-thinned-out pixels adjacent to the thinned-out pixel;
selection means for comparing a sampled value of said thinned-out pixel with a plurality of interpolation values produce from said plurality of interpolation means and selecting one of said plurality of interpolation means;
coding means responsive to an output signal of said selection means to produce a coded word indicating which interpolation means is selected by said selection means; and
superimposition means for superimposing said coded word on a non-thinned-out pixel.
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Abstract
A sub-Nyguist sampling encoder and decoder has a plurality of interpolators provided in an encoder and corresponding plural interpolators provided in a decoder. Information indicating which interpolator can be used to minimize the interpolation error is superimposed on a value of a non-thinned-out pixel and transmitted from the encoder to the decoder, and the decoder receiving the information is permitted to always perform optimum interpolation. The interpolation information is superimposed on the least significant bit of the value of the non-thinned-out pixel, with the view of effecting the superimposition without increasing the amount of transmission data and without degrading quality of the video signal.
127 Citations
17 Claims
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1. A sub-Nyquist sampling encoder comprising:
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means for thinning out pixels from a sampled video data signal in accordance with a predetermined rule; a plurality of interpolation means for interpolating a pixel thinned out by said thin-out means by using non-thinned-out pixels adjacent to the thinned-out pixel; selection means for comparing a sampled value of said thinned-out pixel with a plurality of interpolation values produce from said plurality of interpolation means and selecting one of said plurality of interpolation means; coding means responsive to an output signal of said selection means to produce a coded word indicating which interpolation means is selected by said selection means; and superimposition means for superimposing said coded word on a non-thinned-out pixel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 15)
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12. A sub-Nyquist sampling encoder and decoder comprising:
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an encoder including means for thinning out pixels from an sampled video data signal in accordance with a predetermined rule, a plurality of first interpolation means for interpolating a pixel thinned out by said thin-out means by using non-thinned-out pixels adjacent to the thinned-out pixel, selection means for comparing a sampled value of said thinned-out pixel with a plurality of interpolation values produced form said plurality of first interpolation means and selecting one of said plurality of first interpolation means, coding means responsive to an output signal of said selection means to product a coded word indicating which first interpolation means is selected by said selection means, and superimposition means for superimposing said coded word on a non-thinned-out pixel; and a decoder, responsive to information transmitted from said encoder, including a plurality of second interpolation means having the same respective characteristics as those of corresponding ones of said first interpolation means of said encoder, separation means for separating said coded word from the non-thinned-out pixel, and insertion means for responding to said coded word to select one of said plurality of second interpolation means and inserting an interpolation value obtained from the selected second interpolation means into a position between non-thinned-out pixels. - View Dependent Claims (13, 14, 16, 17)
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Specification