Method and apparatus for video signal interpolation and progressive scan conversion
First Claim
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1. A method for interpolating a video input signal, comprising the steps of:
- forming a vertically interpolated signal from said video input signal;
applying said vertically interpolated signal, a field delayed signal and a field advanced signal to respective inputs of a first median filter for forming a first median filtered signal; and
applying said first median filtered signal, a line delayed signal and a line advanced signal to respective inputs of a second median filter for producing an interpolated video output signal subjected to double median filtering.
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Abstract
A video input signal is vertically interpolated and applied along with a field delayed and a field advanced video signal to respective inputs of a first median filter the output of which is applied along with a line delayed and a line advanced signal to respective inputs of a second median filter to provide an interpolated video output signal. The resultant double median filtered signal and a field delayed signal are applied via respective time compressors to a multiplex switch to provide an output signal of progressive scan form and in which every other line thereof is interpolated by double median filtering.
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Citations
12 Claims
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1. A method for interpolating a video input signal, comprising the steps of:
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forming a vertically interpolated signal from said video input signal; applying said vertically interpolated signal, a field delayed signal and a field advanced signal to respective inputs of a first median filter for forming a first median filtered signal; and applying said first median filtered signal, a line delayed signal and a line advanced signal to respective inputs of a second median filter for producing an interpolated video output signal subjected to double median filtering.
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2. A method for interpolating a video input signal, comprising:
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forming interpolated pixel values by subjecting said video input signal to a temporal median filtering and to a vertical median filtering; selecting as inputs for said temporal median filtering input video signal pixels having the same spatial position and which are temporally adjacent to a pixel to be interpolated and a mean value from input pixels that are vertically adjacent to the pixel to be interpolated to provide a first temporal median filtered video output signal; and selecting as inputs for said vertical median filtering said vertically adjacent pixels and said temporally median filtered video signal for forming a video output signal interpolated by double median filtering. - View Dependent Claims (3, 4, 5, 6, 7, 8)
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9. An interpolator, comprising:
an input from which interlace pixels are supplied to a first field buffer and to a first median filter, which also receives the output signal of a second field buffer and the output signal of an averaging circuit, the output signal of the first field buffer being supplied to a line buffer, to the first input of the averaging circuit and to a second median filter, and the output signal of the line buffer passing to the input of the second field buffer, to a second input of the averaging circuit and to the second filter which is also fed with the output signal of the first median filter, the values for the pixels of the progressive output signal being taken at the output of the second median filter. - View Dependent Claims (10)
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11. Apparatus for interpolating a video input signal, comprising:
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first means for forming a vertically interpolated signal from said video input signal; second means for applying said vertically interpolated signal, a field delayed signal and a field advanced signal to respective inputs of a first median filter for forming a first median filtered signal; and third means for applying said first median filtered signal, a line delayed signal and a line advanced signal to respective inputs of a second median filter for producing a double median filtered video output signal. - View Dependent Claims (12)
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Specification