JAI SW-2000M-CL-65 User Manual

JAI SW-2000M-CL-65 User Manual Manual pdf 31 page image

SW-2000M-CL-6531the full scale. The offset is always entered as a 12-bit number, which means that if you haveset the camera for one of the 8-bit output modes, you should multiply the intended offset shiftby 16 to get the offset for this command.Please keep in mind that this command changes the digital output signal level just before thegain factor is applied. A positive number raises the output levels, while negative numbers dropthe levels being though limited to zero.7.2.7 FFC – flat field correctionThe function of the Flat Field Correction (FFC) is to compensate for differences in the opticalinput. This can be shading due to lower transmission at the lens sides or similar opticalcorrections. The Flat Field Correction must be done when the input light distribution is asuniform as possible in order not to make the FFC correction add errors to the compensationwhen activated.The procedure is then to establish a scene illumination as uniform as possible and having theintended optics for the application before saving the FFC line graph for the correction. Auniform test target is needed. It is recommended to calibrate the correction slightly off focal.This can be achieved either by changing the viewing distance (recommended option) or byturning the lens a little off the best focus. The correction must be OFF during calibration.Command DescriptionFFC ? Returns the FFC command syntaxFFC Shows whether the correction is ON of OFF.FFC RUN When FFC RUN is sent to the camera the actual line image will becorrected to make the line as horizontal as possible.FFC ON Activates the FFC function. If no line graph is saved prior toactivation of the FFC function then no change will be made to theline image.FFC OFF Switches the FFC function OFF. FFC ON command returns the samecorrection factors into use, unless a new FFC SAVE command wasgiven. Default setting.