Method of predicting motion and texture data

Method, as part of a scalable encoding or decoding method, for generating for at least one block of pixels of a picture of a high resolution sequence of high resolution interlaced pictures at least one motion predictor from motion data associated with the pictures of a low resolution sequence of low resolution interlaced pictures each interlaced picture comprising a top field interlaced with a bottom field and able to be coded in frame mode or in field mode, each field of an interlaced picture having associated with it a temporal reference, wherein the method comprises

• generating said at least one motion predictor from the motion data associated with at least one block of pixels of the top field of a low resolution picture of the same temporal reference as the top field of said high resolution picture when said low resolution picture is coded in field mode;
• generating said at least one motion predictor from the motion data associated with at least one block of pixels of the bottom field of said low resolution picture of the same temporal reference as the bottom field of said high resolution picture when said low resolution picture is coded in field mode;
• and
• generating said at least one motion predictor from the motion data associated with at least one block of pixels of a low resolution picture comprising a field with the same temporal reference as the top field or bottom field of the high resolution picture when said low resolution picture is coded in frame mode.