An image processing system includes an image analysis module and an error detection module. The image analysis module is configured to analyze a digital image and to locate a plurality of head points of a subject in the digital image. The image analysis module is configured to detect a high hair condition of a subject, and to compute an adjusted top of head point if a high hair condition is present. The error detection module is configured to evaluate the head points identified by the image analysis module by performing a geometry test to evaluate a geometry of the head points.