结合两步估算和运动补偿的子像素运动估计

Sub-pixel motion estimation based on two-step estimation and motion compensation

针对图像超分辨中的运动估计问题,提出了一种两步估计方法,用于估计低分辨图像帧间的子像素相对运动。第一步,采用相关法或匹配法计算两幅低分辨率图像间的整像素相对位移,对其中的一幅按估计的参数进行运动补偿,第二步,对补偿后的两幅图像使用梯度法计算小数像素相对位移。通过两步计算,得到了比较精确的帧间相对运动参数。该方法不需要对低分辨率图像进行插值,以获得图像的高分辨近似,运算速度也较快。

For the motion estimation problems of image super-resolution,a two-step estimation method is proposed to estimate relative motion parameters between low-resolution images.Firsfly,a certain method such as correlation-or distance-based method is used to estimate integer-pixels shift parameters between two images,one of them is then compensated to aligne to another. Secondly,the gradient-based method is used for the aligned images to estimate fraction-pixels shift parameters between them. Through the two estimation step,the accurate motion parameter is obtained at high speed without interpolating the low resolution images.