1. A method for determining a hand gesture in an image, comprising: detecting, by a face detection module, a facial region in the image; detecting, by a hand detection module, a hand region including a hand gesture in the image; segmenting, using a Gaussian skin color model, the facial region into a binary image; updating, using pixels of the facial region, at least one variable of the Gaussian skin color model; segmenting, using the Gaussian skin color model with the at least one updated variable, the hand region in the image into a binary image; determining, using the binary image of the hand region, at least one shape feature associated with the hand gesture; and determining, using the at least one shape feature, the hand gesture in the binary image.