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Federal Agencies Digitization Initiative Stil Image Working Group — August 2010 —" — Radiometric Distortion - ? aitite 9 definition: The deviation of any given spatially imaged point from an aim radiant energy value relative to the input object. w Noise Power Spectrum (NPS) Chromatic Noise 5 Total Noise eee 5 ul M UM Definition : The inter-color channel! radiometric deviations 5 g Definition : A spatial frequency descriptor of the vit em of radiometric noise of an imaging relative to an identified aim component or m Tem ral Noise Fixed Pattern Noise Color Uniformity Color SFR uniformity Random Banding/ Defects = Definition ; A difference in large | Definition: li woleolpel (stochastic) , (stochastic) ‘ area uniformity/shading spread of light between color 2 8 Definition : The root streaking Definition point or shadin between color channels channels. 8 | mean square deviation | (deterministic) clusters of {determin'stic) ; Definibon : One Definition: A deviation in = ( std. deviation) of both di defective or poorly alli iin mensional ‘ the effective illumination temporal and fixed corrected pixels ‘. patterns over a capture device's pattern noise for a , venriniemneapiee single color channe! ield of view; rang yw lower illumination near the field's outer extent. - Temporal noise « Stripes - Hot, Cold, or - Vignetting - Rainbows — Colored edges ue - Grain - Banding Dead Pixels - Relative illumination ~ Color Bleed £ SE | - Shot noise - Streaking - Wounded Pixels ~ Fringing 2% £ - Read noise ~ Blinkers U - White noise e @: RMS deviation of | @: The relative @: The number or | @: The percent deviation @: The percent deviation of @: The difference in SFR @ || 3 pixel values in terms of | amount of size of defects of several large area several large area chroma response between selected Selected metric(i.e., | variance or noise | per unit sensor luminance measurements | measurements over the field of | color channels, aos counts, density, | power that a area, over the field of view | view relative to the average of | units: % deviation in SFR q pt Luminance) over an | selected spatial units: # of relative to the average of | those chroma measurements. response relative to the : Se identified region of || frequency band defects/unit those measurements, units: % chroma difference highest measured SFR i 5 fe) interest contributes to senate bran units: % Luminance (unit less) ( unit less) § the total noise. difference (unit less) & units: counts, density, | units: TBD 2) Luminance - Aggressive digital ~ Poor sensor ~- dust on sensor - poorly designed optics - Chief ray angle (CRA) - Poor optical design or - signal amplification or calibration ~ poor sensor - non-uniform lighting mismatch between optics and performance 3 w processing - dust/dirt on fabrication sensor & « High ISO sneed linear array - Non-uniform color coatings at = 3 selection sensor - poor sensor sensor fabrication. g - High throughput “ poor sensor calibration | 2 | workflows calibration