In optical line-scan image generators, e.g., laser image and microdensitometer recorders, the intensity point spread function of the reconstruction or printing spot can be varied by implementation of appropriately shaped spatial filters in the optical train. The shape of the spread function can be manipulated to provide different distributions of the overlap between adjacent lines or spots. The distribution of the overlap influences both the cosmetic appearance of the imagery and the amount of resolution and contrast loss created by the blending of the intensities from adjacent lines or spots at their point of contact. In the study reported here, sampled imagery stimuli of aerial scenes displaying effects of nine different reconstruction spots were utilized in viewer experiments. Rankings of viewer preferences were generated for ideal, jitter-free reconstruction. In addition, experiments were conducted to assess performance of the reconstruction in the presence of deterministic cyclic banding and random Gaussian jitter. Emphasis of these experiments was placed on judging for information content and the maintenance of information content when spot position errors are introduced by the reconstruction.
Roger J. Arguello,
"Reconstruction Spots For Digital Sampled Images", Proc. SPIE 0117, Data Extraction and Classification from Film, (22 November 1977); doi: 10.1117/12.955662; https://doi.org/10.1117/12.955662