Feature Extraction and Image Processing

236 Feature Extraction and Image Processing

The technique was originally demonstrated to extract the face boundary, for feature

extraction within automatic face recognition, as illustrated in Figure 6.10. The outer boundary

(Figure 6.10(a)) was extracted using a convex hull which in turn initialised an inner and an

outer contour (Figure 6.10(b)). The final extraction by the dual discrete contour is the

boundary of facial skin, Figure 6.10(c). The number of points in the mesh naturally limits

the accuracy with which the final contour is extracted, but application could naturally be

followed by use of a continuous Kass snake to improve final resolution. ...