Dalsa PC-30-02K80 User Manual
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Piranha Color Camera User’s Manual 37DALSA 03-032-10211-01 5/9/2007Example: sah 23.13 Processing Chain Overview andDescriptionThe following diagram shows a simplified block diagram of the camera’s analog anddigital processing chain. The analog processing chain begins with an analog gainadjustment, followed by an analog offset adjustment. These adjustments are applied tothe video analog signal prior to its digitization by an A/D converter.The digital processing chain contains the spatial correction, non-linearity look-up table(LUT) correction, FPN correction, the PRNU correction, the background subtract, thedigital gain, and the background add. All of these elements are user programmable.Figure 7: Signal Processing ChainAnalog Processing Digital Processinganalog videoanaloggainanalogoffsetFPNcoefficientsdigitaloffsetPRNUcoefficientsbackgroundsubtractdigital systemgainsag,ccg saoccfsdoccp,cpa ssb ssgbackgroundadditiondigital videosabbackgroundadditiondigital videoeilLUTadditionAnalog Processing Optimizing offset performance and gain in the analog domain allows you to achievea better signal-to-noise ratio and dynamic range use. Perform all analog adjustmentsprior to any digital adjustments. Analog gain (sag or ccg command) is multiplied by the analog signal to increasethe signal strength before the A/D conversion (and before noise is added to thesignal). The analog offset (sao command) or black level is an “artificial” offset introducedinto the video path to ensure that the A/D is functioning properly. The analogoffset should be set so that it is at least 3 times the RMS noise value at the currentgain.Digital Processing To optimize camera performance, complete all analog adjustments before digitalsignal adjustments. Fixed pattern noise (FPN) calibration (calculated using the ccf command) is usedto subtract away individual pixel dark current. |
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