本文提出一种改进的亚像素算法，通过将目标区域划分成内部像素区域和边缘像素区域两部分，并对内部像素灰度进行均值化，从而有效抑制内部像素噪声。-This paper presents an improved sub-pixel algorithm, the target region is divided into pixels within the pixel region and edge regions of two parts, and with average gray level of the internal pixels to suppress noise within the pixel.