Patent ID: 8477242
Filing Date: 2013-07-02
Classification: G06T,H04N

Abstract:
1. Digital image processing apparatus in which first image data representing a digital image at a lower sampling frequency is up-sampled in a sampling ratio N:M to a higher sampling frequency in an up-sampling filter to produce second image data representing the said digital image at the said higher sampling frequency; and, said second image data at the said higher sampling frequency is down-sampled in a sampling ratio M:N to the said lower sampling frequency in a down-sampling filter to produce third image data representing said digital image at said lower sampling frequency, where the combination of the up-sampling filter and the down-sampling filter is substantially transparent characterised in that every filtered sample is formed from a weighted sum of at least two input samples, where N and M are integers, where 1<N<M and where M is not a multiple of N.