Method of converting resolution of video signals and apparatus using the same
First Claim
1. A method of converting resolution of an input video signal, the method comprising:
- calculating up-sampling and down-sampling ratios based on a resolution of the input video signal and a desired resolution of an output video signal;
calculating a number of filter tabs by multiplying up-sampling and down-sampling ratios by a number of side lobes;
calculating first filter coefficients of a same number of filter tabs by multiplying a window function by a sinc function;
calculating final filter coefficients of a filter by subtracting a result of a multiplication of a Gaussian function by the window function from the first filter coefficients, and then normalizing the final filter coefficients; and
performing filtering in vertical and horizontal directions based on the final filter coefficients by modifying a sampling rate of the input video signal depending on the up-sampling and down-sampling ratios.
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Abstract
A method converts a resolution of video signals, the method including: calculating up-sampling and down-sampling ratios based on a resolution of an input video signal and a desired resolution of an output video signal; calculating a number of filter tabs by multiplying the up-sampling and down-sampling ratios by a number of side lobes; calculating first filter coefficients of a same number of the filter tabs by multiplying a window function by a sinc function; calculating final filter coefficients by subtracting a result of a multiplication of a Gaussian function by a window function from the first filter coefficients, and then normalizing the final filter coefficients; and performing filtering in vertical and horizontal directions based on the final filter coefficients by modifying a sampling rate of an input video signal depending on the up-sampling and down-sampling ratios, to obtain clear video images.
72 Citations
30 Claims
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1. A method of converting resolution of an input video signal, the method comprising:
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calculating up-sampling and down-sampling ratios based on a resolution of the input video signal and a desired resolution of an output video signal; calculating a number of filter tabs by multiplying up-sampling and down-sampling ratios by a number of side lobes; calculating first filter coefficients of a same number of filter tabs by multiplying a window function by a sinc function; calculating final filter coefficients of a filter by subtracting a result of a multiplication of a Gaussian function by the window function from the first filter coefficients, and then normalizing the final filter coefficients; and performing filtering in vertical and horizontal directions based on the final filter coefficients by modifying a sampling rate of the input video signal depending on the up-sampling and down-sampling ratios. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An apparatus to convert resolution of an input video signal, the apparatus comprising:
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a first unit to calculate up-sampling and down-sampling ratios based on a resolution of the input video signal and a desired resolution of an output video signal; a second unit to calculate a number of filter tabs by multiplying up-sampling and down-sampling ratios by a number of side lobes; a third unit to calculate first filter coefficients of a same number of the filter tabs by multiplying a window function by a sinc function; a fourth unit to calculate final filter coefficients of a filter by subtracting a result of a multiplication of a Gaussian function by a window function from the first filter coefficients, and then normalizing the final filter coefficients; and first and second scaling filters to perform filtering in vertical and horizontal directions based on the final filter coefficients by modifying a sampling rate of the input video signal depending on the up-sampling and down-sampling ratios.
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14. A computer readable medium having recorded thereon a computer readable program having computer-executable instructions for converting resolution of an input video signal, the computer instructions excluding carrier waves and comprising:
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calculating up-sampling and down-sampling ratios based on a resolution of the input video signal and a desired resolution of an output video signal; calculating a number of filter tabs by multiplying up-sampling and down-sampling ratios by a number of side lobes; calculating first filter coefficients of a same number of filter tabs by multiplying a window function by a sinc function; calculating final filter coefficients of a filter by subtracting a result of a multiplication of a Gaussian function by the window function from the first filter coefficients, and then normalizing the final filter coefficients; and performing filtering in vertical and horizontal directions based on the final filter coefficients by modifying a sampling rate of the input video signal depending on the up-sampling and down-sampling ratios. - View Dependent Claims (15, 16, 17, 18, 19)
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20. An apparatus to convert resolution of an input video signal, the apparatus comprising:
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an input signal processing unit to divide the input video signal into vertical and horizontal direction components; first and second multiplexers to apply the vertical and horizontal direction components to first and second scaling filters; the first and second scaling filters to scale the vertical and horizontal direction components according to a predetermined scheme; a third multiplexer to combine an output of the first and second scaling filters to provide a scaled output to an output signal processing unit; and the output signal processing unit to convert the scaled output to a desired resolution. - View Dependent Claims (21, 22, 23, 24, 25, 26, 27, 28)
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29. An apparatus to convert resolution of an input video signal, the apparatus comprising:
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a video signal resolution processing unit to divide the input video signal into vertical and horizontal direction components; and a bi-level filtering system to perform filtering in vertical and horizontal directions based on final filter coefficients by modifying a sampling rate of the input video signal depending on up-sampling and down-sampling ratios, wherein the bi-level filtering system comprises; first and second multiplexers to apply the vertical and horizontal direction components to first and second scaling filters; the first and second scaling filters to scale the vertical and horizontal direction components according to a predetermined scheme; a third multiplexer to combine an output of the first and second scaling filters to provide a scaled output to an output signal processing unit; and the output signal processing unit to convert the scaled output to a desired resolution. - View Dependent Claims (30)
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Specification