Patent ID: 8041107

Claim:
An OVD inspection method of inspecting an OVD attached to a base material by using an inspection apparatus including illumination means, image input means including image capturing means, storage means, and image processing means, comprising: arranging the image capturing means and the illumination means at positions where mirror-reflected light and diffracted light from a region of the OVD in a wave range not less than 650 nm have values not more than a threshold value upon a binarization process by the image processing means; causing the illumination means to irradiate a surface of the base material with infrared rays or light containing infrared rays; causing the image input means to input image data including a wave range not less than 650 nm from a region including the OVD attached to the base material; causing the storage means to store, in advance, a first data including reference image data of an OVD serving as a standard, or a second data including the reference image data and reference data indicating a reference position of the OVD serving as the standard; and causing the image processing means to execute the binarization process of the input image data, compare the binarized image data with first data to obtain a first comparison result, or the binarized image data with the second data to obtain a second comparison result, and determine acceptability of at least one of a form, area, and position of the OVD attached to the base material on the basis of the first comparison result or the second comparison result.