Typical output horizontal formats are high definition 1920 pixels and standard definition 1280 pixels . the purpose of the horizontal format conversion is to allow up or down sampling of picture data in order to increase or decrease the number of horizontal samples in a line to allow the video output to match many different standards 水平格式变换的目的在于对视频数据进行上抽样或下抽样以增加或减少每行的像素数量，使视频输出符合不同的标准；垂直格式变换则是对视频图像的垂直分辨率上进行上抽样或下抽样。
