METHOD AND DEVICE FOR DETECTING ABNORMAL SHADOW CANDIDATE

摘要

PROBLEM TO BE SOLVED: To stably detect an abnormal shadow as an abnormal shadow candidate even when the abnormal shadow such as a tumor shadow exists in the neighborhood of the end edge of an image in an abnormal shadow candidate detecting device. SOLUTION: When the tumor shadow candidate is detected by using an iris filter processing, a reflection processing is performed, where a direction traverse is reflected at the end edge of the image by a reflection angle being the same as an incident angle to the image end edge as the gradient vector of a pixel after the image end edge concerning a direction towards the image end edge within the range of the maximum radius Rmax of the tumor shadow to be detected. The gradient vector of the pixel at a position corresponding to the pixel after the image end edge on the direction traverse after the reflection processing is folded with the image end edge as a linearly symmetrical axis so as to substitute a folding gradient vector which is obtained by this.