Lip motion features such as lip width and lip length provide important information to identify individuals or commands. The interface using lip motion features is practical because operation is possible without touching devices. Therefore, it is important to develop a method for extracting the lip shape from the facial image data. In this paper, we propose an automatic lip extraction method on the basis of color and shape information of lips. First, a process already proposed in one of our previous studies extracts lip regions on the basis of color information: difference of redness between lips and skins. Second, lip conditions are distinguished into three type, “Good”, “Protrusion”, and “Defect”, by the difference of the width and height of the lips between object and latest frame. If the lip conditions are “Protrusion” and “Defect”, the correction of lip shape is performed. Our experimental results for eleven persons suggest that the proposed method can extract lip shapes at about 98.1 percent.
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