Only advanced users in specific situations should use the Laser Pixel CG Locator Properties tab.
Probe Toolbox - Laser Pixel Locator Properties tab
Scanning methods with a portable device using a Perceptron laser differ from DCC machines. If you open the Auto Feature dialog box and are using a portable device with a Perceptron laser, the Laser Pixel CG Locator Properties tab is hidden.
The Laser Pixel CG Locator Properties tab only appears if you have a Perceptron laser sensor. This tab uses various mathematical algorithms to change how the software accurately determines the pixels comprising the stripe.
The algorithms operate on an image that consists of rows and columns of pixels. The laser stripe within that image illuminates a band of pixels. The pixel locator then computes the location of the true pixel in the image.
In the following pixel locator algorithms, PC-DMIS computes a surface point based on the illumination of a column of pixels in the image:
Gray Sum: If you select this locator type, PC-DMIS limits the data collection to the parts of the line that fall between the specified Min and Max values. These minimum and maximum limits are a percentage of the average intensity for each laser line. These limits can be used to improve the data quality for specific part geometry situations. See "Feature and Material Settings".
Material: This list allows you to select a predefined material type (Custom, Sheetmetal, White, Blue, Black and Aluminum) with its corresponding Min/Max values. When you select a material type, the software loads the saved Min/Max values for that material type. Using the default option of Custom you can define a generic set of Min/Max values. If you modify the Min/Max values, the Material type automatically switches to Custom.
Min: If any part of the laser line's intensity falls below this value, the software won't use that part. In situations where the edges are important, you can reduce this value so more of the edge data is preserved as the laser wraps around the edges. For a shiny part with internal corners that cause reflections and noise in the data, you can increase this value to eliminate the "noise" generated by internal reflections.
Max: If any part of the laser line intensity exceeds this value, the software won't use that part. In some situations where a part has many contours that you cannot easily follow, the laser reflects strongly. This causes localized over-exposures. Reducing this value may help to ensure that the overexposed areas do not provide bad data.
The software always selects Gray Sum for portable devices using the Perceptron V5 laser sensor.
Fixed Threshold: If you select this locator type, PC-DMIS discards all the data below the threshold and it computes the actual pixel location as the center of gravity of the remaining pixels within the column.
Gradient: If you select this locator type, PC-DMIS computes the actual pixel location. It looks at a column of pixels and finds where the slope changes direction. For each direction change, PC-DMIS creates a pixel.
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