1. A method for managing data in an image processing system, the method comprising: /a/ receiving a data request indicating a vector associated with a pixel to be processed, the vector associated with the pixel to be processed being relative to a reference pixel having a known address, the pixels being of a plurality of pixels of an image, the plurality of pixels being associated with data stored at respective data addresses, each data address being linked by a bijective function to respective coordinates (X′, Y′) of an ordered image reference frame relating to a position of the associated pixel in the image; /b/ determining the coordinates of the reference pixel by applying the bijective function to the address of the data associated with the reference pixel; /c/ obtaining the coordinates of the pixel to be processed from the coordinates of the reference pixel determined in step /b/ and from the vector associated with the pixel to be processed; /d/ determining the address of the data associated with the pixel to be processed by applying an inverse function of the bijective function to the coordinates of the pixel to be processed as obtained in step /c/; and /e/ providing the data read at the address determined in step /d/, wherein, the image is divided into a plurality of macroblocks of pixels corresponding respectively to macroblocks of data, the data in each macroblock of data being in a first arrangement relative to the respective positions of the pixels in said corresponding macroblock of pixels, and the macroblocks of data being arranged in memory in a second arrangement relative to the respective positions of the corresponding macroblocks of pixels in the image, the ordered image reference frame is defined based, on spatial coordinates (X,Y) of the pixel to be processed in a spatial reference frame of the image and on the second arrangement.