| 摘要 |
Method for rapid FM-halftoning of pictures where all possible values in the picture correspond to a halftone plate, in which the halftone dots are maximally scattered. If the picture that is to be halftoned contains 256 different tone values, thus 256 halftone plates are pre-calculated, all constituted only by ones and zeros, that together build a halftoning volume. At the halftoning itself no comparison is then executed, but the choice to set a certain position in the picture or not is instead solved by a table-look-up method. The value of the input picture gives index in the table (that is which halftone plate that is to be used) and then the value from the corresponding position in the halftone plate is copied into the output picture. |
