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Pub. No.:    WO/2017/032468    International Application No.:    PCT/EP2016/060827
Publication Date: Fri Mar 03 00:59:59 CET 2017 International Filing Date: Sat May 14 01:59:59 CEST 2016
IPC: G06T 3/60
Inventors: GEORGESCU, Vlad
MUNTEANU, Mihai Constantin
BIGIOI, Petronel
ZAHARIA, Corneliu
FULOP, Szabolcs
SIMON, Gyorgy
An image processing apparatus comprises a normalisation module operatively connected across a bus to a memory storing an image in which a region of interest (ROI) has been identified within the image. The ROI is bound by a rectangle having a non-orthogonal orientation within the image. In one embodiment, the normalisation module is arranged to divide the ROI into one or more slices, each slice comprising a plurality of adjacent rectangular tiles. For each slice, the apparatus successively reads ROI information for each tile from the memory including: reading a portion of the image extending across at least a width of the slice line-by-line along an extent of a slice. For each tile, the apparatus downsamples the ROI information to a buffer to within a scale SD<2 of a required scale for a normalised version of the ROI. The apparatus then fractionally downsamples and rotates downsampled information for a tile within the buffer to produce a respective normalised portion of the ROI at the required scale for the normalised ROI. Downsampled and rotated information is accumulated for each tile within a normalised ROI buffer for subsequent processing by the image processing apparatus.