... One of the principal objectives of the Chandra Multiwavelength Project (ChaMP) is the optical identification and cataloging of serendipitously detected background X-ray sources in Chandra archival data. The ChaMP uses a program of multi-filter optical imaging of observed Chandra fields to detect optical counterparts to X-ray sources. ... Automated pipeline processing of the optical data includes source extraction, photometric calibration and optical to X-ray source matching. ...