| 摘要 |
<p>A method of and apparatus for processing video signals to achieve a visual effect corresponding to that which would be achieved if an input two-dimensional image were projected onto a three-dimensional surface is disclosed. A video signal is formed into digitized sample values each having an input pixel address comprising X and Y coordinate values. X and Y scaling multipliers (a, β) and Z coordinate values corresponding to the respective pixel addresses on the three-dimensional surface to which each of the input pixel addresses will be moved in achieving the visual effect are stored in a mapping store (20). Multipliers (22, 24) multiply the X and Y coordinate values of each input pixel address by the corresponding X and Y scaling multipliers (α, β), and the resulting scaled X and Y coordinate values and the associated Z coordinate values are supplied to a perspective transformation device (33) to derive the output X and Y coordinate values corresponding to the visual effect.</p> |
