Real-time image rotation on FPGA´s board

The aim of this work is to realize the implementation of real-time high-quality image rotation on an FPGA board. The method we use is based on the work of Unser et al. (1993) and consists in applying a B-spline interpolator. The difficulty of this problem is due to the large number of operations needed to implement this solution on FPGAs which have a relatively weak integration capacity. To solve this problem, we have searched for a way of determining the minimum number of bits to code the filter while keeping good accuracy on the filtering output. In this article, we briefly review B-spline function definitions and present how we use B-spline interpolation for the image rotation problem. We then describe the way we calculate the probability density function of the output error in order to determine the filter data coding