Abstract
A skin color is one of the features that is often used to detect a face and a hand of human. A skin detection method based on skin color is often introduced in an early stage of detection process. The method can be realized by a relatively simple algorithm. In addition, it is a powerful method that gives a major impact on the detection accuracy. However, there is a problem that the method cannot adapt to change in a color of ambient light. In order to perform the method even if a color of ambient light is changed, we proposed an estimation method of spectral ratio of ambient light. In proposed method, first, we estimate a reflectivity of an object by using a reference light whose spectral ratio is known. Then, we estimate a spectral ratio of ambient light by using the estimated reflectance of the object.
