![]() To achieve feature-appropriate surface contrast on these difficult object surfaces and ultimately gather a 3D perspective, Photometric Stereo may be applied to vary the direction of incident illumination between successive views, while holding the viewing direction constant.Īchieving Surface Contrast with Photometric Stereo Therefore, it may be ineffective in certain applications, because local surface shapes (including embossing or other 3D details) cannot, in general, be determined from the intensity value recorded at a single image point. A standard vision light and camera configuration, typically used in machine vision, only captures images from a single illumination/viewer perspective. However, some objects have 3D aspects that make accurately identifying surface defects more difficult, such as embossing, textured or highly reflective surfaces, as well as those objects exhibiting little to no feature contrast or texture. For many surfaces, simple defects such as scratches and dents are easily identifiable with a machine vision camera and a traditional lighting solution. Machine vision is commonly deployed in part inspections to gather feature-appropriate identifying information from an object’s surface and to increase the speed, accuracy, and consistency of the inspection process.
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