[00104] In general, motion vector prediction mechanisms, such as those motion vector prediction mechanisms presented above as examples, may include prediction or inheritance of certain pre-defined or indicated motion parameters. [00105] A motion field associated with a picture may be considered to comprise of a set of motion information produced for every coded block of the picture. A motion field may be accessible by coordinates of a block, for example. A motion field may be used for example in TMVP or any other motion prediction mechanism where a source or a reference for prediction other than the current (de)coded picture is used. [00106] The position of a slice within a picture is indicated through block indexing in raster scan order within a picture. In HEVC, the syntax element slice segment address of slice_segment_header( ) specifies the address of the first coding tree block in the slice segment, in the coding tree block raster scan of a picture. [00107] A motion vector anchor position is a position (e.g., horizontal and vertical coordinates) within a picture area relative to which the motion vector is applied. A motion vector anchor position may be regarded as the initial point for the motion vector. While conventionally the motion vector anchor position has been inferred to be the same as the position of the block being predicted, it has been proposed that a horizontal offset and a vertical offset for adapting the motion vector anchor position could be encoded into the bitstream and/or decoded from the bitstream. A horizontal offset and a vertical offset for the anchor position may be given in the slice header, slice parameter set, tile header, tile parameter set, or the like. [00108] An example encoding method taking advantage of a motion vector anchor position comprises: encoding an input picture into a coded constituent picture; reconstructing, as a part of said encoding, a decoded constituent picture corresponding to the coded constituent picture; encoding a spatial region into a coded tile, the encoding comprising: determining a horizontal offset and a vertical offset indicative of a region-wise anchor position of the spatial region within the decoded constituent picture; encoding the horizontal offset and the vertical offset; determining that a prediction unit at position of a first horizontal coordinate and a first vertical coordinate of the coded tile is predicted relative to the region-wise anchor position, wherein the first horizontal coordinate and the first vertical coordinate are horizontal and vertical coordinates, respectively, within the spatial region; indicating that the prediction unit is predicted relative to a prediction-unit anchor position that is relative to the region-wise anchor position; deriving a prediction-unit anchor position equal to sum of the first horizontal coordinate and the horizontal offset, and the first vertical coordinate and the vertical offset,