Use pattern matching or edge detection to find the part.
A crack is technically a discontinuity—a void where the material separates. However, surface texture (brushed metal), lighting variations (glare), and contaminants (oil, dust) all look like "edges" to a camera. In a standard version of VBAI, a bright spot or a machining mark will trigger a false positive.
Locating parts despite changes in rotation, scale, or lighting.