Dalsa Piranha ES-80-08k40-00-R User Manual

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Dalsa Piranha ES-80-08k40-00-R User Manual Manual pdf 58 page image

Piranha ES-xx User Manual03-032-20070-02 Teledyne DALSA58Calibrating Analog OffsetPurpose: Instead of manually setting the analog offset to a specific value,the camera can d etermine appropriate offset values. Thiscommand calculates and averages each tap’s pixels w ithin theROI and sets the offset to achieve the specified average targetvalue.Syntax: cao t iSyntax Elements: tTap selection. Use 0 for all taps or 1 to number of CCD tapsfor ind ivid ual tap selection.iAverage target value in a range from 1 to 255DN (12 bitLSB).N otes:  Perform analog offset calibration before performing FPN andPRN U coefficients. To use this command , CCD shift d irection should becontrolled internally, either scd 0 or 1Example: cao 1 50Updating the Gain ReferenceTo update the analog gain reference:Purpose: Sets the current analog gain setting to be the 0d B point. This isuseful after tap gain matching allow ing you to change the gain onall taps by the same amount.Syntax: ugrCalibrating the Camera to Remove Non-Uniformity(Flat Field Correction)Flat Field Correction OverviewThis cam era has the ability to calcu late correction coefficients in ord er to rem ove non -u niform ity in the im age w hen operating in TDI Mod e. This vid eo correction o perates on apixel-by-pixel basis and im plem ents a tw o point correction for each pixel. This correctioncan red u ce or elim inate im age d istortion cau sed by the follow ing factors: Fixed Pattern N oise (FPN ) Photo Response N on Uniform ity (PRN U) Lens and light sou rce non-u niform ityCorrection is im plem ented su ch that for each pixel:Voutput =[(Vinput - FPN( pixel ) - digital offset) * PRNU(pixel) – Background Subtract] x System Gainw here Voutput = d igital ou tpu t pixel valu eVinput = d igital inpu t pixel valu e from the CCD