Implementation of a real time image rotation using B-spline interpolation on FPGA's board

Abstract

The aim of our work is to realize the implementation of a real-time high-quality image rotation on FPGA's board. The method we used is based on M. Unser's work (1993) and consists in applying a B-spline interpolator. The difficulty of this problem is due to the relatively weak integration capacity of FPGAs. To solve this problem, we have searched for determining the minimum number of bits to code the filter while keeping a good accuracy on filtering output. In this article, we remind a few definitions about B-spline functions and we present how we use B-spline interpolation for the image rotation problem. Then, we describe the way we calculate probability density function of the output error in order to determine the filter data coding.