11. The apparatus according to claim 8 , wherein the parameter of each weak classifier determined by the determining module comprises a location and a size of a rectangular frame of the weak classifier, and the processing module comprises: an average grayscale value determining unit, configured to divide an area, the area having a same size as the rectangular frame of the weak classifier and the area using a location of the rectangular frame of the weak classifier as a center, into at least two subareas, and to calculate an average grayscale value of each of the at least two subareas; a setting unit, configured to select a reference area from the at least two subareas, and to set, for each of the at least two subareas except the reference area, a sign bit that includes one of a first sign bit or a second sign bit; and a sketch value determining unit, configured to obtain a sketch value of the weak classifier according to the average grayscale values of the at least two subareas except the reference area, the sign bits of the at least two subareas except the reference area, and the preset threshold of the weak classifier.
11. The apparatus according to claim 8 , wherein the parameter of each weak classifier determined by the determining module comprises a location and a size of a rectangular frame of the weak classifier, and the processing module comprises: an average grayscale value determining unit, configured to divide an area, the area having a same size as the rectangular frame of the weak classifier and the area using a location of the rectangular frame of the weak classifier as a center, into at least two subareas, and to calculate an average grayscale value of each of the at least two subareas; a setting unit, configured to select a reference area from the at least two subareas, and to set, for each of the at least two subareas except the reference area, a sign bit that includes one of a first sign bit or a second sign bit; and a sketch value determining unit, configured to obtain a sketch value of the weak classifier according to the average grayscale values of the at least two subareas except the reference area, the sign bits of the at least two subareas except the reference area, and the preset threshold of the weak classifier. 12. The apparatus according to claim 11 , wherein the sketch value determining unit comprises: a comparison subunit, configured to compare the average grayscale value of each of the at least two subareas except the reference area with the average grayscale value of the reference area; a first marking subunit, configured to: for each of the at least two subareas except the reference area, mark a location of the area with a first location mark if a comparison result of the comparison subunit is that a difference between the average grayscale value of the area and the average grayscale value of the reference area is not less than the preset threshold of the weak classifier and if the sign bit of the subarea is the first sign bit, and for each of the at least two subareas except the reference area, mark the location of the area as a second location mark if the comparison result of the comparison subunit is that the difference between the average grayscale value of the area and the average grayscale value of the reference area is less than the preset threshold of a weak classifier and if the sign bit of the subarea is the first sign bit; a second marking subunit, configured to, for each of the at least two subareas except the reference area, mark the location of the area as the first location mark if the comparison result of the comparison subunit is that an opposite number of the difference between the average grayscale value of the area and the average grayscale value of the reference area is not less than the preset threshold of a weak classifier and when the sign bit of the area is the second sign bit, and for each of the at least two subareas except the reference area, mark the location of the area as the second location mark if the comparison result of the comparison subunit is that the opposite number of the difference between the average grayscale value of the area and the average grayscale value of the reference area is less than the preset threshold of a weak classifier and when the sign bit of the area is the second sign bit; and a sequence value determining subunit, configured to sort location marks of all the areas according to a preset order to obtain a sequence and to obtain the sketch value of the weak classifier according to the sequence.