Imaging Device

An imaging device comprising:

• a movable stage capable of moving in two different directions while mounting an object to be inspected;
• a camera which is arranged in face-to-face relation to the movable stage, photographs the object to be inspected, and generates a moving picture image made of a plurality of continuous frame images;
• a mosaic image generation unit which assembles not less than two still images photographed by the camera, and generates a mosaic image that is wider in field of view than an actual field of view of the camera;
• a feature quantity extraction unit which extracts feature quantity from the frame image and the mosaic image;
• a relative position determination unit which determines a relative position between the frame image and the mosaic image by comparison of the feature quantity;
• and
• a live image display unit which updates a display position of the frame image with respect to the mosaic image based on a determination result of the relative position, and displays the moving picture image on the mosaic image, wherein
• the live image display unit changes the display position in response to the relative position when determined as having succeeded in positioning of the frame image by the relative position determination unit, and fixes the display position when determined as having failed in positioning of the frame image.