Prof. Dersch tests interpolator quality by repeatedly rotating an image by 5 degree steps until the image is rotated 180 degrees in a total of 36 generations. We can judge the quality of an interpolation method by comparing the final image to the original and by comparing final images produced by different interpolators. Figure 4 illustrates The Panorama Factory method with a portion of a stitched panorama. Figures 1a and 2a are 1999 by Helmut Dersch. Figure 4 is 1999 by John Strait.
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The released version of The Panorama Factory does not include an image rotation command per se . It is possible, however, to rotate an image using the Crop command. The images used in this article were rotated with an unreleased image rotation extension that permits rotation of images by specific angles. This extension will be available in a future release of The Panorama Factory. A statement of the problem The Panorama Factory uses the common bi-linear interpolation method.