Abstract: An alpha channel is added in addition to multiple channels forming an image of an item. A second pixel value differing from a first pixel value, which is assigned to a defect-free region, is assigned to a region corresponding to a defect region in the alpha channel. The image including the alpha channel is divided into multiple image segments. A defect label is assigned to the image segment in which the second pixel value is included in the alpha channel, and a non-defect label is assigned to the image segment, in which the second pixel value is not included in the alpha channel. The alpha channel is removed from the image segments to generate labeled image segment data.

Abstract: A sealed thrust ball bearing having a plurality of balls rollable between a first race and a second race and elastic seal members sealing the clearance between the inner peripheral portions of the races and the clearance between the outer peripheral portions of the races. The first race has a hollow cylindrical portion on its inner periphery extending toward the second race with an inner elastic seal member fixedly fitted to an outer side thereof. The second race has a hollow cylindrical portion on its outer periphery extending toward the first race with an outer elastic seal member fixedly fitted to an inner side thereof. The inner elastic seal member has a lip in intimate contact with the inner peripheral portion of the second race. The outer elastic seal member has a lip supporting the axially outer face of the outer peripheral portion of the first race in intimate contact with the face.