| http://www.w3.org/ns/prov#value | - Additionally, an optical sensor such as a CCD or CMOS device may be used to detect and measure skin pigmentation level or skin type based on the light that is reflected back from the skin; a treatment may be varied according to pigmentation level or skin type. [0163] In some embodiments of the present invention, a motion sensor is used in conjunction with a feedback loop or look-up table to contro
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