| 摘要 |
Methods and systems for estimating a correction angle (Figs. 5 and 6) that rotationally aligns a first polar centered image with a second polar centered image (50), wherein the first and second polar centered images include values on a polar grid having evenly spaced polar angle coordinates for each of at least one radial distance coordinate, include the following steps: calculating a polar cross-power spectrum for the first and second polar centered images, the polar cross-power spectrum comprising a phase profile having at least polar angular frequency coordinates; and fitting a linear function of the angular frequency coordinate to the phase profile of the polar cross-power spectrum to determine the correction angle ( DELTA ).). |
