Current Help System: PC-DMIS Laser (View Core Help)

### Laser Probe Toolbox: Laser Pixel Locator Properties tab

Only advanced users in specific situations should use the Laser Pixel Locator Properties tab.

Probe Toolbox - Laser Pixel Locator Properties tab

Because 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, this tab will be hidden.

The Laser Pixel Locator Properties tab uses various mathematical algorithms to change how the pixels comprising the stripe are accurately determined.

The algorithms operate on an image consisting 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 expressed as 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 drop-down list allows you to select a predefined material type (Custom, Sheetmetal, White, Blue, Black and A aluminum) with its corresponding Min/Max values. Selecting a Material type will load the saved Min/Max values for the material type. Using the default option of Custom allows you to define a generic set of Min/Max values. If you modify the Min/Max values, the Material type will automatically switch to Custom.

- Min: Any part of the laser line whose intensity falls below this value will not be used. 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, this value can be increased to eliminate the "noise" generated by internal reflections.

- Max: Any part of the laser line whose intensity exceeds this value will not be used. Some situations where a part has many contours which cannot be easily followed, the laser is strongly reflected causing localized over-exposures. Reducing this value may help to ensure that the overexposed areas do not provide bad data.

Note: Gray Sum is always selected for portable devices using the Perceptron V5 laser probe.

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 by looking at a column of pixels and finding where the slope changes direction. For each direction change PC-DMIS creates a pixel.

More:

Feature and Material Settings