Edge Locator Configuring Edge Locator Properties - Advanced The Advanced Properties section of the Edge Locator tool interface provides access to advanced Edge Locator parameters and properties. Sampling refers to the procedure used by the tool for gathering values within the portion of the input image that is bounded by the tool’s region of interest. Two sampling parameters, the Sampling Step and Bilinear Interpolation, can be used as necessary to create a required tradeoff between speed and accuracy.
Advanced Edge Locator Configuration Properties Bilinear Interpolation Bilinear Interpolation specifies if bilinear interpolation is used to sample the image before it is analyzed for image sharpness. To ensure subpixel accuracy in inspection applications, Bilinear Interpolation should always be set to true (enabled). Non-interpolated sampling (Bilinear Interpolation disabled) should only be used in applications where the speed requirements are more critical than accuracy. Custom Sampling Step Custom Sampling Step is the step size that the tool uses to sample the input image that is bounded by the tool region of interest.
The sampling step represents the height and the width of a sampled pixel. ACEUser's Guide, 3.6.x, 18316-000 Rev A Page 479 Object Definition Default Sampling Step Default Sampling Step is the best sampling step computed by the tool, based on the average size, in calibrated units, of a pixel in the image. This default sampling step is usually recommended. Default Sampling Step is automatically used by the tool unless Custom Sampling Step is enabled.