| 摘要 |
<p>Data manipulation apparatus is described for converting raster-scanned data received from a scanner 2 at a first picture element (pel) resolution to a second lower pel resolution for display on a CRT terminal 4. The apparatus includes a scale-changing means 3 which operates on receipt of the image data from the scanner 2 to perform a scalechange operation on the pels, first in the image row direction and then in the image column direction. The row scale-change operation is performed by scale-change projector 5 which functions to replace subgroups of pels in the input image rows by single pels at its output. The image data emerging from projector 5, consolidated in the row direction, is further processed by a second scale-change projector 6 which performs the column scale-changing operation. Again, the size of the sub-groups are determined by the degree of compression required to convert to the lower pel resolution.</p> |
