The images generated by large-FOV optical equipment usually have geometric distortion.It is difficult to implement real-time correction of the geometric distortion for images with high resolution and serious distortion on hardware platforms.After analyzing the problems of the existing serial and parallel algorithmswe proposed a structure of buffer in which both odd and even pixels in the odd and even lines of the images were buffered separately.Bilinear interpolation algorithm was used together with the proposed structure for implement geometric correction and gray grade correction of the images.The experiments results showed that the proposed structure may realize gray interpolation algorithm easily with less resourcesand implement real-time distortion correction with a shorter delay.