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We examine a class of adaptive sampling techniques employed in image synthesis and show that those commonly used for efficient anti-aliasing are statistically biased. This bias is dependent upon the image function being sampled as well as the strategy for determining the number of samples to use. It is most prominent in areas of high contrast and is attributable to early stages of sampling systematically favoring one extreme or the other. If the expected outcome of the entire adaptive samplingdoi:10.1145/122718.122735 dblp:conf/siggraph/KirkA91 fatcat:aj7pxno3lfdfxmc6fnpynxajse