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000002354 005__ 20160701171704.0
000002354 037__ $$aASTROimport-511
000002354 100__ $$ade Cuyper, J.-P.
000002354 245__ $$aThe Removal of Periodic Read-Out Patterns from Science Frames
000002354 260__ $$c2000
000002354 520__ $$aBias frames taken with CCDs should be homogeneous in intensity. In practice, they fulfill this requirement often sufficiently well, although deviations from homogeneity may be detectable. However, sometimes a clear pattern is superposed on the frame, and this pattern may vary with time. Using a large number of bias frames obtained in one specific run, the time-dependent pattern was found to be built up of a fixed one-dimensional periodic function whose phase-shift varies from row to row. It was successfully removed from calibration and science frames through the use of pre- and upscan ``bias'' pixels available in each of these frames. 
000002354 700__ $$a Hensberge, H.
000002354 773__ $$c535$$pAstronomical Data Analysis Software and Systems IX$$v216$$y2000
000002354 85642 $$ahttp://esoads.eso.org/abs/2000ASPC..216..535D
000002354 905__ $$apublished in
000002354 980__ $$aNONREF