Disclosed is a method for re-sampling an input image comprising input samples to produce an output image comprising output samples. The method includes the following steps. A set of kernel values (130) is determined (110) based on a position (120) of an input sample (100), each kernel value in the set corresponding to a distinct output sample position. Each kernel value in the set is multiplied (105) by the value of the input sample to form a contribution. Each contribution corresponds to a distinct output sample and is first added (145) to a value in a corresponding storage location in an output accumulator (140), the result of the first addition replacing the contents of the storage location in the output accumulator. Each kernel value is also second added (135) to a storage location in a sliding kernel accumulator (150), the result of the second addition replacing the contents of the storage location in the sliding kernel accumulator. An accumulated output value, is read from the output accumulator (140), is divided (160) by a kernel weight read from the sliding kernel accumulator (150) to form an output sample at the output sample position. A position of the sliding kernel accumulator is advanced by one value.