Optimizing a fairly constrained environment is not quite the same as working with an unconstrained environment. Early explorers of face detection techniques soon ran into the limit that the training data of people photographed in well-lit environments with set poses did not equip systems for unconstrained environments, also known as the real world, where most people do not walk around with studio-quality lighting. When researchers began collecting images of faces “in the wild,” candid images of people posted online to improve face detection systems, this was like moving from a nice indoor
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