Abstract: Nearest neighbor method，the traditional arithmetic used in unwrapping omnidirectional images to panorama and perspective images，leads to low unwrapping quality，though it is simple.This paper introduces quadratic interpolation method to improve unwrapping quality.And trigonometrical function table checking method is referenced to reduce large arithmetic amount in the unwrapping process.According to the experiments，more sharper unwrapped images can be obtained using the method described in this paper.

Key words: omnidirectional image, panorama image, unwrap, quadratic interpolation method, table checking method

摘要： 把全方位图像展开成全景图或透视图时，近邻取样的像素点取值方法虽然运算简单，但展开后的图像质量较差。采用双线性内插值法，提高了展开图像的质量。并使用三角函数查表法减少了展开过程的运算量。实验结果表明，采用该方法展开后的图像更清晰。

关键词: 全方位图像, 全景图, 展开, 双线性内插值法, 查表法