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In our research work, we need to conduct motion detection tests with subpixel precision by tracking natural textures on stone materials. The test samples used in the laboratory can weight more than 1 kg to have a statistically representative amount of texture details. This weight makes them too heavy for scientific sliders. In this work, we propose the use of photographic sliders as precision displacement systems. Since these systems are designed for artistic purposes, precise calibration is necessary for their use in accurate displacements. The calibration procedure involves the precise tracking of a circular target’s centroid location with subpixel accuracy. To achieve this, the slider’s speed and the camera’s acquisition time are adjusted, ensuring that interframe is around 0,1 pixels. The same trajectory is assessed at various displacement speed to determine both the repeatability and linearity in velocity and positioning. The tests were conducted using a Thorlabs DDS100/M linear slider and an Edelkrone One photographic slider. The results demonstrate that the photographic slider delivers a similar level of precision at just one-fifth of the cost when compared to the Thorlabs slider. |
