Detecting a face, an effortless task for humans, requires vigilant efforts on part of a computer. It has to decide whether a pixel
in an image is part of a face or not. It needs to detect faces in an
image which may have a non uniform background, variations in lightning
conditions and facial expressions, thus making the task a complex one.
The task is comparatively easy in images with a uniform background,
frontal photographs and identical poses, as in any typical mug shot or a
passport photograph.
Traditionally,
methods that focus on facial landmarks (such as eyes), that detect
face-like colours in circular regions, or that use standard feature
templates, were used to detect faces.
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