Patent ID: 7729604
Filing Date: 2010-06-01
Classification: G02B,G03B,H04N

Abstract:
1. An automatic focusing system of a camera comprising: a brightness detecting unit configured for detecting a general brightness value of an environment of a subject prior to a focusing operation of the camera and outputting a correction factor associated with the general brightness value; the brightness detecting unit also configured for determining a first set of brightness values and a first set of contrast values; the first set of brightness values comprising a number of first brightness values of the environment detecting during the focusing operation; the first set of contrast values comprising a number of first contrast values which are determined with respect to the respective first brightness values of the environment; a recording unit configured for storing the first set of brightness values and the first set of contrast values; and a correcting unit configured for calculating a number of second contrast values according to the correction factor, the first set of brightness values, a preset brightness value, and a preset contrast value; and a selecting unit configured for choosing a maximum contrast value from the number of second contrast values of the subject.