| 摘要 |
<p>- 28 IMAGE RESAMPLING BY FREQUENCY UNWRAPPING 5 A method (499, 1099) of determining at least one image value of a corresponding desired output position (1 1 10) on an output grid of an output image from an input image on an input grid (300, 400, 1100), is disclosed. The method determines (420, 1020), in a localised region of the input image, an orientation of an edge passing through the output position. A frequency spectrum for the region of the input image is extended (430, 1030). 10 The method aligns a main frequency band (510) of the edge in the extended frequency spectrum parallel to a first sampling axis of a grid based on the orientation of the edge. The grid is selected from the set of the input and output grids. The method filters (450, 1040) the aligned main frequency band along a second sampling axis of the grid, orthogonal to the first sampling axis, the filter removing frequencies (720) associated with 15 replica bands and maintaining the main frequency band (710). The image value is determined (470, 1050) from the filtered edge at the desired output position. The determined image value is stored (405, 1060) as part of the output image. P026903_speci_as filed 6220458v] Low-resolution Desired output t image resolution value Orientation 310 filter Default Orientation upsampler 350 adaptive 330 upsampler Blend 38 0 High-resolution 390 image Fig. 3 6220401v PRO3 Finc FinnI</p> |
