IMAQ Advanced Setup Match Geometric Pattern 2

Specifies how the VI identifies curves in the image. Set this option to 0 if you want the VI to make no assumptions about the uniformity of objects in the image or the image background. Set this option to 1 if you want the VI to assume that either the objects in the image or the image background consist of uniform pixel values. This option allows the VI to more accurately calculate the external curves of the objects.

Specifies the minimum contrast an edge pixel must have for it to be considered part of a curve. Valid values range from 1 to 255.

Specifies the width of the edge filter that the VI uses to identify curves in the image. Set this option to 0 to specify a fine filter width, set this option to 1 to specify the normal filter width, or set this option to 2 to specify contour tracing.

Specifies the length, in pixels, of the smallest curve that you want the VI to identify. The VI ignores any curves that have a length less than this value. The default value is 25.

Specifies the distance, in the y direction, between the image rows that the algorithm inspects for curve seed points. Valid values range from 1 to 255. The default value is 15.

Specifies the distance, in the x direction, between the image columns that the algorithm inspects for curve seed points. Valid values range from 1 to 255. The default value is 15.

Specifies the maximum gap, in pixels, between the endpoints of a curve that the VI identifies as a closed curve. If the gap is larger than this value, the VI identifies the curve as an open curve. The default value is 10.

Specifies whether to identify only closed curves in the image. The default value is FALSE, which specifies that the VI should identify both open and closed curves.

The VI ignores this option.

Specifies that the VI should calculate the Correlation Score and return it for each match result. The default value is 1, which enables the Correlation Score.

Determines whether to return the match results with subpixel accuracy. Set this option to 1 to enable subpixel accuracy. The default value is 0, which disables subpixel accuracy.

Specifies the maximum number of incremental improvements used to refine matches using subpixel information. The minimum value for this option is 20.

Specifies the maximum amount of change, in pixels, between consecutive incremental improvements in the match position before the VI stops refining the match position. The default value is 0, which specifies that the VI should always use a number of refinements equal to Subpixel Iterations. If you provide values for both Subpixel Iterations and Subpixel Tolerance, the VI refines the match for, at most, Subpixel Iterations but may stop early if Subpixel Tolerance is satisfied.

Specifies the maximum size of the match list. The match list contains the regions in the inspection image that have the highest probability of containing a match. The minimum value for this option is 5. The default value is 200.

Specifies whether the VI should calculate the match curve to template curve score and return it for each match result. Set this option to 1 to enable the target template curve score. The default value is 0, which disables the target template curve score.

Specifies the minimum separation distance, in pixels, between the origins of two matches that have unique positions. The VI does not return matches that have the same position, scale, and angle. Set this value to -1 if you do not want the VI to use the position of a match to determine whether the match is unique. The default value is 20.

Specifies the minimum angular difference, in degrees, between two matches that have unique angles. The VI does not return matches that have the same position, scale, and angle. Set this value to -1 if you do not want the VI to use the angle of a match to determine whether the match is unique. The default value is 10.

Specifies the minimum difference in scale, expressed as a percentage, between two matches that have unique scales. The VI does not return matches that have the same position, scale, and angle. Set this value to -1 if you do not want the VI to use the scale of a match to determine whether the match is unique. The default value is 10.

Specifies the maximum amount of overlap, expressed as a percentage, allowed between the bounding rectangles of two matches. Set this value to -1 to ignore this option. The default value is 80.

Specifies whether you want the algorithm to spend less time accurately estimating the location of a match. Set this value to 1 if you want to quickly determine whether a part is present in the inspection image without an accurate estimate of its position, angle, and scale. The default value is 0, which specifies that the VI returns matches with pixel or subpixel accuracy.

Specifies whether or not the algorithm treat the inspection image as a calibrated image. Use the IMAQ Set Simple Calibration VI or the IMAQ Set Calibration Info VI to calibrate the inspection image. The default value is TRUE.

Specifies the contrast of the matches to search for. Set it to 0 to search for matches with the same contrast as the template. Set it to 1 to search for matches with the inverse contrast of the template. Set it to 2 to search for matches with the same and inverse contrast of the template. The default value is 0.

Specifies the aggressiveness of the strategy used to find matches in the image. The default is 1. The following options are available.

• Conservative (0) —Specifies the geometric matching algorithm to use the largest possible amount of information from the image at the expense of slowing down the speed of the algorithm.
• Balanced (1)—Specifies the geometric matching algorithm to balance the amount of information from the image it uses with the speed of the algorithm.
• Aggressive (2)—Specifies the geometric matching algorithm to use a lower amount of information from the image, which allows the algorithm to run quickly but at the expense of accuracy.

Specifies the factor applied to the number of matches requested to determine how many matches are refined in the pyramid stage. The default is 0, which specifies that the factor is determined internally by the IMAQ Match Geometric Pattern 2 VI.

Specifies the factor applied to the number for matches requested to determine how many matches are used for the final (subpixel) stage. The default is 0, which specifies that the factor is determined internally by the IMAQ Match Geometric Pattern 2 VI.

Specfies the number of iterations to perform to refine the curve.

Specifies how the output match score is computed. The score can be computed as a combination of the different scores that are returned by the Matches output from the IMAQ Match Geometric Pattern 2 VI (Standard Score, Template Target Curve Score, Target Template Curve Score and Correlation Score). The default is 0, which returns just the Standard Score. The score is computed as the average scores as shown in the table below:

Specifies the angular accuracy, in degrees, to be used for initial matching. Default values are 6 (Aggressive), 5 (Balanced) and 3 (Conservative).

Specifies whether or not to calculate the defect map between template and match image. The default value is OFF.