Sampling analog video signal for secondary images
First Claim
1. A method of providing pixel data from a luminance component and at least one chrominance component of an analog video signal, for a secondary image within or adjacent to a main image having a main image sample rate, said secondary image being displayed by a display device having a staggered pixel array, comprising the steps of:
- sampling each of said components of said analog video signal at a rate of 2/n(h) times said main image sample rate, where 1/n(h) is the horizontal scaling factor of said secondary image and n is one-half the number of rows in said main image, thereby providing a stream of luminance samples and at least one stream of chrominance samples;
selecting, from said streams of samples, a first pattern of samples for even rows of said staggered pixel array, wherein every other sample is a luminance sample and every other sample is a chrominance sample; and
selecting, from said streams of samples, a second pattern of samples for odd rows of said staggered pixel array, wherein every other sample is a luminance sample and every other sample is a chrominance sample, and wherein said luminance samples of said first pattern and of said second pattern are offset by one sample.
1 Assignment
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Accused Products
Abstract
A data converter (13) for providing data for secondary images in a video display system (10). One embodiment (FIG. 2) provides data for a staggered pixel array, by using an A/D converter (23) to sample the data at a rate of 2/n(h) times the sample rate of the main image, where 1/n(h) is the horizontal scaling factor. A multiplexer (24) selects between two different sample patterns. Another embodiment (FIG. 3) provides data for progressively scanned secondary images by selecting 2/n(v) times the number of lines per input field, where 1/n(v) is the vertical scaling factor.
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Citations
19 Claims
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1. A method of providing pixel data from a luminance component and at least one chrominance component of an analog video signal, for a secondary image within or adjacent to a main image having a main image sample rate, said secondary image being displayed by a display device having a staggered pixel array, comprising the steps of:
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sampling each of said components of said analog video signal at a rate of 2/n(h) times said main image sample rate, where 1/n(h) is the horizontal scaling factor of said secondary image and n is one-half the number of rows in said main image, thereby providing a stream of luminance samples and at least one stream of chrominance samples; selecting, from said streams of samples, a first pattern of samples for even rows of said staggered pixel array, wherein every other sample is a luminance sample and every other sample is a chrominance sample; and selecting, from said streams of samples, a second pattern of samples for odd rows of said staggered pixel array, wherein every other sample is a luminance sample and every other sample is a chrominance sample, and wherein said luminance samples of said first pattern and of said second pattern are offset by one sample. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A secondary image data converter for providing pixel data from a luminance component and at least one chrominance component of an analog video signal, for a secondary image within or adjacent to a main image having a main image sample rate, said secondary image being displayed by a display device having a staggered pixel array, comprising:
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an A/D converter for sampling each of said components of said analog video signal at a rate of 2/n(h) times said main image sample rate, where 1/n(h) is the horizontal scaling factor of said secondary image and n is one-half the number of rows in said main image, thereby providing a stream of luminance samples and at least one stream of chrominance samples; and a multiplexer for selecting, from said streams of samples, a first pattern of samples for even rows of said staggered pixel array, wherein every other sample is a luminance sample and every other sample is a chrominance sample, and for selecting, from said streams of samples, a second pattern of samples for odd rows of said staggered pixel array, wherein every other sample is a luminance sample and every other sample is a chrominance sample, and wherein said luminance samples of said first pattern and of said second pattern are offset by one sample.
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8. A method of providing progressive scan pixel data from an interlaced analog video signal, for a secondary image within or adjacent to a main image having a main image sample rate, comprising the steps of:
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sampling said analog video signal at a rate of 1/n(h) times said main image sample rate, where 1/n(h) is the horizontal scaling factor of said secondary image and n is one-half the number of rows in said main image;
thereby providing field data on a line-by-line basis; andselecting 2n(v) the number of lines of each field of said field data, where 1/n(v) is the vertical scaling factor of said secondary image. - View Dependent Claims (9, 10, 11)
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12. A secondary image data generator for providing progressive scan pixel data from an interlaced analog video signal, for a secondary image within or adjacent to a main image having a main image sample rate, comprising:
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an A/D converter for sampling said analog video signal at a rate of 1/n(h) times said main image sample rate, where 1/n(h) is the horizontal scaling factor of said secondary image and n is one-half the number of rows in said main image;
thereby providing field data on a line-by-line basis; anda line selector for selecting 2/n(v) the number of lines of each field of said field data, where 1/n(v) is the vertical scaling factor of said secondary image. - View Dependent Claims (13)
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14. A method of providing interpolated pixel data from a luminance component and at least one chrominance component of an analog video signal, for a secondary image within or adjacent to a main image having a main image sample rate, said secondary image being displayed on a display device having a staggered pixel array, comprising the steps of:
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sampling each of said components of said analog video signal at a rate of 2/n(h) times said main image sample rate, where 1/n(h) is the horizontal scaling factor of said secondary image and n is one-half the number of rows in said main image;
thereby providing a stream of luminance samples and at least one stream of chrominance samples having a first pattern for even rows of said staggered pixel array, wherein every other sample is a luminance sample and every other sample is a chrominance sample;sampling each of said components of said analog video signal at said rate of 2/n(h) times said main image sample rate, thereby providing a stream of luminance samples and at least one stream of chrominance samples having a second pattern for odd rows of said staggered pixel array, wherein every other sample is a luminance sample and every other sample is a chrominance sample, and wherein said luminance samples of said first pattern and of said second pattern are offset by one sample; selecting between samples of said first pattern and samples of said second pattern on a line-by-line basis to provide lines of interpolation samples, such that even output lines are interpolated from samples of said first pattern and odd output lines are interpolated from samples of said second pattern; and interpolating said interpolation samples to provide output lines for said secondary image. - View Dependent Claims (15, 16, 17)
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18. A secondary image data generator for providing progressive scan pixel data from a luminance component and at least one chrominance component of an analog video signal, for a secondary image within or adjacent to a main image having a main image sample rate, said secondary image being displayed on a display device having a staggered pixel array, comprising:
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a first A/D converter for sampling each component of said analog video signal at a rate of 2/n(h) times said main image sample rate, where 1/n(h) is the horizontal scaling factor of said secondary image and n is one-half the number of rows in said main image;
thereby providing a stream of luminance samples and at least one stream of chrominance samples having a first pattern for even rows of said staggered pixel array, wherein every other sample is a luminance sample and every other sample is a chrominance sample;a second A/D converter for sampling each of said components of said analog video signal at said rate of 2/n(h) times said main image sample rate, thereby providing a stream of luminance samples and at least one stream of chrominance samples having a second pattern for odd rows of said staggered pixel array, wherein every other sample is a luminance sample and every other sample is a chrominance sample, and wherein said luminance samples of said first pattern and of said second pattern are offset by one sample; a multiplexer for selecting between samples of said first pattern and samples of said second pattern on a line-by-line basis to provide lines of interpolation samples, such that even output lines are interpolated from samples of said first pattern and odd output lines are interpolated from samples of said second pattern; and an interpolation processor for interpolating said interpolation samples to provide output lines for said secondary image.
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19. A method of providing interpolated pixel data from a luminance component and at least one chrominance component of an analog video signal, for a secondary image within or adjacent to a main image having a main image sample rate, said secondary image being displayed on a display device having a staggered pixel array, comprising the steps of:
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sampling each of said components of said analog video signal at a rate of 2/n(h) times said main image sample rate, where 1/n(h) is the horizontal scaling factor of said secondary image and n is one-half the number of rows in said main image;
thereby providing a stream of luminance samples and at least one stream of chrominance samples, wherein every other sample is a luminance sample and every other sample is a chrominance sample;selecting alternating pairs of said samples, thereby providing samples for odd output lines and samples for even output lines; and interpolating said samples for the even output lines and said samples for the odd output lines, to provide output lines for said secondary image.
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Specification