Abstract: An information processing apparatus is provided with a book data acquisition unit which acquires a book data item including a plurality of image data items related to covers and individual pages of a book, a length acquisition unit which acquires a longitudinal length and a lateral length of the book based on lengths of two sides of the plurality of image data items included in the book data item, and an image data determination unit which compares the longitudinal and lateral lengths of the book to the lengths of the two sides of each of the image data items to determine the image data item determined to include neither one page nor two facing pages as the image data item including a spine image.

Abstract: An information processing apparatus is provided with a book data acquisition unit which acquires a book data item including a plurality of image data items related to covers and individual pages of a book, a length acquisition unit which acquires a longitudinal length and a lateral length of the book based on lengths of two sides of the plurality of image data items included in the book data item, and an image data determination unit which compares the longitudinal and lateral lengths of the book to the lengths of the two sides of each of the image data items to determine the image data item determined to include neither one page nor two facing pages as the image data item including a spine image.

Abstract: This lens barrel includes a lens-receiving surface that extends in an intersection direction intersecting the central axis; a side frame portion that is arranged further outward than the lens-receiving surface in the intersection direction and that protrudes in the direction of the central axis from the lens-receiving surface; and a plurality of caulking portions that are formed at a tip portion of the side frame portion in the protruding direction and are deformed by external pressure to caulk and fix a lens between the caulking portions and the lens-receiving surface. The lens-receiving surface is formed so as to be axisymmetrical to the central axis.

Abstract: This lens barrel includes a lens-receiving surface that extends in an intersection direction intersecting the central axis; a side frame portion that is arranged further outward than the lens-receiving surface in the intersection direction and that protrudes in the direction of the central axis from the lens-receiving surface; and a plurality of caulking portions that are formed at a tip portion of the side frame portion in the protruding direction and are deformed by external pressure to caulk and fix a lens between the caulking portions and the lens-receiving surface. The lens-receiving surface is formed so as to be axisymmetrical to the central axis.