Pattern Locator l The minimum size of a pattern is fixed as 3x3 pixels. Related Topics Pattern Locator Configuring Pattern Locator Properties - Advanced Pattern Locator Results Configuring Pattern Locator Properties - Advanced The Advanced Properties section of the Pattern Locator interface provides access to advanced Pattern Locator parameters and properties. Tool Sampling Parameters 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 region of interest. Two sampling parameters, the Sampling Step and Bilinear Interpolation, can be used to create the desired balance between speed and accuracy.
Bilinear Interpolation Bilinear Interpolation uses pixel averaging to improve the quality of the image. It is applied before the image is analyzed. 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 (1 - 100) The Sampling Step is the step used by the tool to sample the area of 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.
For applications where a more specific tradeoff between speed and accuracy must be estab- lished, the sampling step can be modified by enabling the Custom Sampling Step and setting the desired value. ACEUser's Guide, 3.6.x, 18316-000 Rev A Page 588