Image analysis apparatus, method, and program

An image analysis method executed by an image analysis apparatus comprising a hardware processor and a memory, the image analysis method comprising:

• acquiring, by the image analysis apparatus, an image obtained by capturing an image of a scene including an object to be detected;
• extracting, by the image analysis apparatus, a partial image of an area in which the object to be detected exists from the acquired image by using an extraction frame of a predetermined size surrounding the partial image;
• detecting, by the image analysis apparatus, a position of a feature point of the object to be detected from the extracted partial image and determining, by the image analysis apparatus, a reference position of the object to be detected based on the position of the feature point;
• correcting, by the image analysis apparatus, an extraction position in which the partial image is extracted with the extraction frame based on the determined reference position and re-extracting, by the image analysis apparatus, the partial image with the extraction frame at the corrected extraction position;
• and
• detecting, by the image analysis apparatus, information representing a feature of the object to be detected from the re-extracted partial image.