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    • 2. 发明授权
    • Method of converting resolution of video signals and apparatus using the same
    • 转换视频信号分辨率的方法及使用该方法
    • US07375767B2
    • 2008-05-20
    • US10994279
    • 2004-11-23
    • Hoyoung LeeChangyeong KimDusik ParkSeongdeok LeeAlexey Lukin
    • Hoyoung LeeChangyeong KimDusik ParkSeongdeok LeeAlexey Lukin
    • H04N1/393H04N7/01
    • H03H17/0664G06T3/4007H03H17/0282H03H17/0657H04N7/0125H04N7/0135
    • 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.
    • 一种方法转换视频信号的分辨率,该方法包括:基于输入视频信号的分辨率和输出视频信号的期望分辨率来计算上采样和下采样比; 通过将上采样和下采样比乘以多个旁瓣来计算多个滤波器选项卡; 通过将窗函数乘以sinc函数来计算相同数目的滤波器选项卡的第一滤波器系数; 通过从第一滤波器系数中减去高斯函数乘以窗函数的结果来计算最终滤波器系数,然后归一化最终滤波器系数; 并且通过基于上采样和下采样比修改输入视频信号的采样率,基于最终滤波器系数在垂直和水平方向上执行滤波,以获得清晰的视频图像。