A digital algorithm for characteristic film curvesThe task of establishing a film calibration scheme for magnitude studies of Skylab photographic images of Comet Kohoutek is examined. Since the data are recorded in terms of film density and have to be used in terms of exposure, the conversion from density to exposure is critical. In this film calibration scheme, the hardware deals with the data sources, recording medium, and data conversion to a computer compatible program, whereas the software deals with signal to noise enhancement, stepwedge calibration curve and leads to modeling of the film characteristic curves. A mathematical model of the characteristic curve is obtained using a modified version of Efroymson's (1960) stepwise multiple linear regression algorithm, which gives log exposure as a function of density. The difference in the calibration curves from pre- and postflight exposures is well accounted for in the model as a result of sensitive statistical tests. The characteristic curve modeling program requires about 4K of core and is executed in about 3 min.
Document ID
19760059115
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Buckner, J. (Computer Sciences Corp. Huntsville, AL, United States)
Cash, T. (Computer Sciences Corp. Huntsville, Ala., United States)
Craven, P. (Computer Sciences Corp. Huntsville, AL, United States)
Edwards, T. (NASA Marshall Space Flight Center Space Sciences Laboratory, Huntsville, Ala., United States)