Annotating Historical Archives of Images Figure 23. Sample matches from the projectile point experiment. a) Zella-Grahm-Mentzer, b) Delhi- Perry, c) Firstview, d) Williams-t1525, e) Zorra-1802 of all distances to the nearest neighbors for just the correctly classified examples. We linked our 30 images with a collection of 310 arrowheads. Figure 23 shows examples of the five best matches as measured by the Com- bined_Dist function. FUTURE RESEARCH DIRECTIONS Euclidean Distance (MED) measure. We showed that a critical issue is determining the appropriate mix of shape/color/texture: instead of having a fixed weighting parameter to combine different features on various applications, e.g. butterflies/ shields/arrowheads, we introduced an algorithm that can automatically learn the best weighting parameter upon different scenarios.