... Up: Image Restoration . ... Recent large catalogs have revolutionized our ability to do astrometry with CCD images. ... After matching image point sources to objects in each of the catalogs and fitting world coordinate systems to them using the IMWCS program, we find mean residuals between observed and catalog star positions of between 0 09 and 0 25 for the latest catalogs. ... Catalog . ... Figure 1 shows the distribution of mean Catalog-Image positions in arcseconds. ... Image-Catalog (arcsec) . ...