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The camera's focal plane array (FPA) fill factor is one of the parameters fordigital cameras, though it is not widely known and usually not reported inspecs sheets. The fill factor of an imaging sensor is defined as the ratio of apixel's light sensitive area to its total theoretical area. It is generallybelieved that the lower fill factor may reduce the accuracy of photogrammetricmeasurements. But nevertheless, there are no studies addressing the effect ofthe imaging sensor's fill factor on digital image correlation (DIC) measurementaccuracy. We report on research aiming to quantify the effect of fill factor onDIC measurements accuracy in terms of displacement error and strain error. Weuse rigid-body-translation experiments then numerically modify the recordedimages to synthesize three different types of images with 1/4 of the originalresolution. Each type of the synthesized images has different value of the fillfactor; namely 100%, 50% and 25%. By performing DIC analysis with the sameparameters on the three different types of synthesized images, the effect offill factor on measurement accuracy may be realized. Our results show that theFPA's fill factor can have a significant effect on the accuracy of DICmeasurements. This effect is clearly dependent on the type and characteristicsof the speckle pattern. The fill factor has a clear effect on measurement errorfor low contrast speckle patterns and for high contrast speckle patterns (blackdots on white background) with small dot size (3 pixels dot diameter). However,when the dot size is large enough (about 7 pixels dot diameter), the fillfactor has very minor effect on measurement error.

Effect of Camera's Focal Plane Array Fill Factor on Digital Image Correlation Measurement Accuracy