CNN RECOGNITION METHOD OF LICENSE PLATE NUMBER USING ANCHOR BOX AND CNN AND APPARATUS USING THEREOF

摘要

A license plate number recognition apparatus, according to the present invention, comprises: an image input unit for receiving a first image; a second image generating unit for generating a second image by detecting a region of interest including characters from the first image; a feature component extracting unit for extracting feature component from the second image; an anchor box generating unit for generating a plurality of anchor boxes having the same vertical size as the second image and a horizontal size different from that of the second image, from the second image; a bounding box generating unit for comparing the feature component of the second image, corresponding to the areas of the anchor boxes, with character detection learning data to select an anchor box having the maximum matching value as a bounding box for each character area; and a character recognition unit for comparing the feature component of the area corresponding to the bounding box with the character recognition learning data to recognize the characters corresponding to the anchor box. The anchor boxes each include: an end anchor boxes (where a is a natural number) positioned to overlap each other at predetermined intervals over all areas of the second image and having the same horizontal and vertical sizes; a base anchor boxes positioned on one sides of the end anchor boxes and having a horizontal size smaller than a vertical size; and a plurality of sub-anchor boxes including the areas of the base anchor boxes and having a size that is increased than the horizontal size of each of the base anchor boxes by a predetermined size while having a horizontal size smaller than the horizontal size of the end anchor box. Thus, the license plate number can be recognized more accurately.