Example of Object with Good Focus
6.2 Lighting and Illumination Strategy
Once the image has been properly focused, adjust front and back lighting using the on- screen sliders provided by M3 software. You can also utilize room lighting, or shield the system from room lighting, as appropriate. Correct lighting is paramount to accurate measurement with any video-based measurement system. A clear image with lighting toward the low side is recommended. Lighting that is too low will result in a dark, low-contrast image with indiscernible features. Lighting that is too bright might result in a washed-out image and in hot spots (or blooms) that provide false edges. When adjusting lighting, start with light that is lower than desired, then increase lighting while viewing the image on the computer monitor. Maintain constant light ing for consistent results. Do not to change light levels between points used to measure the same geometrical feature. Depending on the part characteristics and the feature being measured, the right combination of lighting might aid in bringing out a particular feature. Take time to experiment by balancing the available light sources.
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