[Inspection Techniques] Dimming and Lens Aperture
About dimming and lens aperture
We received a question from a customer using the image inspection software EasyInspector: "Can inverter fluorescent lights not be dimmed?" We inform customers using EasyInspector that "if the inspection does not have issues with indoor fluorescent lights or inverter fluorescent lights, there is no need to use expensive lighting." Many LED lights have separate lighting and power components, and they can be dimmed using a knob on the power unit, so I thought this question was quite natural. In fact, there are various methods for adjusting brightness: 1) Dimming 2) Aperture of the lens (in the case of industrial cameras) 3) Camera exposure time and gain settings In other words, in principle, if any one of the above three can be adjusted, brightness can be controlled. So, what is the best method for adjustment? (Figure 1) This is a photo of part of a plastic bottle cap. The focus is set on the bottom of the cap. Both images have the same brightness, but you can see that the left image has the focus extending to the edge of the cap compared to the right. This is referred to as "having a deep depth of field."
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In fact, these two images have the same lighting brightness, but the left one has a smaller lens aperture and a longer exposure time. The aperture is narrowed, making the image darker, so the exposure time is increased to restore the same brightness. When the aperture is narrowed, the "depth of field" becomes deeper, making it easier to focus on both near and distant objects. Considering this, the order of brightness adjustment would be: 1) Fix the lighting at Max 2) Set the exposure time as long as possible (if it's too long, like with camera shake, the image will become blurry) 3) After making it as bright as possible under the above conditions, adjust the brightness by narrowing the "aperture" So, brightness can always be set to Max. Of course, there are inspections that do not fit this example, but I think this general approach is reasonable.
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