1. An image processing system, comprising: image data processing means of automatic adaptation of 3-D Mesh Model to image features, for Model-based image segmentation, comprising means of dynamic adaptation of Model resolution to image features including means of locally setting higher resolution when reliable image features are found and means of setting lower resolution when unreliable image features are found, wherein reliability of an image feature is based on a feature confidence parameter, the feature confidence parameter depending on feature distance and noise; and viewing means for visualizing images.