BACKGROUND DIFFERENCE EXTRACTION DEVICE AND BACKGROUND DIFFERENCE EXTRACTION METHOD

摘要

PROBLEM TO BE SOLVED: To provide a technique for enabling the acquisition of a background difference using an image acquired by a camera whose viewpoint is moved.;SOLUTION: First, a background image being an image not including an object is acquired by a camera 11. The positional information of a pixel in the background image is converted into polar coordinate information in a fixed coordinate system by using the information of the visual line direction and viewpoint position of the camera 11. A correspondence relationship between the color information of the pixel in the background image and the polar coordinate information of the pixel is recorded in a recording part 3. Then, an actual image being the image including the object is acquired by the camera 11. The positional information of the pixel in the actual image is converted into the polar coordinate information in the fixed coordinate system by using the information of the visual line direction and viewpoint position of the camera 11. The background image in an angle region corresponding to the actual image is specified as a target background by using the polar coordinate information of the pixel in the actual image. The actual image is compared with the target background, to extract a difference between them.;COPYRIGHT: (C)2015,JPO&INPIT