| 摘要 |
PROBLEM TO BE SOLVED: To provide a technology for attaining noise reduction processing with high accuracy without increasing processing time when photographing the same subject by a plurality of frames while changing a projection angle.SOLUTION: A plurality of projection images of a subject photographed by irradiating the subject with radiation from respectively different angles are acquired. Inside a first search area centering on a pixel focused attention on in a first projection image, a first determination area centering on the pixel focused attention on is set. From a second projection image, a pixel projecting the same object as the pixel focused attention on is specified, and a second search area centering on the pixel is set. For the respective pixels inside the first and the second search areas, similarity between an area centering on the pixel and the first determination area is obtained, and weighting to a pixel value of the pixel is performed using a weight value taking a smaller value for the higher similarity. A pixel value of the pixel focused attention on is updated using the total value of the pixel values for which weighting is performed for the respective pixels inside the first and the second search areas. |
