Knowledge of visual inspection: Lighting: The angle of illumination greatly affects the image.
By considering the position and angle of the lighting according to the inspection content, the stability of the inspection is improved!
When inspecting with images, the quality of the light that enters the camera's light sensor significantly affects whether the defects you want to detect can be found or not. 1: Influence of Reflected Light One of the factors that changes significantly depending on the angle of illumination is reflected light. For example, as shown in the example below, even when photographing the same object, the appearance can change completely depending on the angle of the lighting. (Figure 1: Left: When illuminated from directly above, Right: When illuminated from an angle) The sample above has a moisture-proof coating applied to the surface of the substrate, giving it an overall glossy appearance. When photographing such an object, if light is directed straight on, the light source may reflect directly, resulting in an undesirable image. In such cases, the lighting is angled. (Figure 2: Left: When illuminated from directly above, Right: When illuminated from an angle) The blue arrows in the above diagram indicate the reflection of the light source. When light is directed from directly above, the reflected light enters the camera directly, but when illuminated from an angle, the reflected light escapes to the opposite side, allowing you to avoid direct reflected light.
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2: Emphasis on Irregularities The appearance of objects with irregularities can change significantly depending on the angle of the lighting. (Figure 3: Left: When light is directed from directly above, Right: When light is directed from an angle) The example above shows the plastic imprint on a power strip. If you want to inspect for the presence of foreign substances (such as black spots) in the plastic, you would use light from directly above to make it easier to detect foreign objects (by minimizing the irregularities). Conversely, if you want to check the accuracy of the imprint's text, you would choose to shine light from an angle to emphasize the irregularities and make the text stand out. By considering the position and angle of the lighting according to the inspection requirements, the stability of the inspection can be improved. The lighting does not have to be expensive equipment for image inspection; even commercially available reading inverter fluorescent lights can be sufficiently effective. Please give it a try. *For more details, please refer to the related links.
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