One Method for Extracting Sub-pixel Light Stripe Centerlines Applied to the Structured Light

In the three-dimensional reconstruction process of skull parts, exacting the light stripe centerline is very important while using structured light technique to obtain information on the skull surface. As for more than one light stripe in the image, this paper presents a method based on gradient barycenter method. First, the image is cutted, color separation and median filtering, then determining whether it is the light stripe under the trend of gray scale difference of pixels, the last using gradient barycenter method to extract the sub-pixel light stripe centerlines. Experiments show that the method has better extraction precision and faster speed, also with good noise immunity.