| 摘要 |
<p>In a digital video effects system a data store (13) is provided for storing the address within a frame store of image information from the corresponding image frame that is to appear within another image frame as transposed on to a curved surface. The addresses are stored in ''curved'' order so that when the store (13) is addressed via inputs (24) providing the coordinates of the scanning point of the television raster, the store (13) provides, at an output (25) that address within the frame store which contains the image information to be represented at the corresponding point in the final image. Such storage of the address values in ''curved'' order is achieved by applying at data inputs of the store a linear sequence of the coordinate addresses of the image frame store whilst providing at write addresses (11, 12) of the data store (13) corresponding values of the coordinates that have been transformed to define the curved surface to appear in the final image.</p> |
