Manual

Table Of Contents

DobotVisionStudio User Guide

108

• Edge Pair Type: see Spacing Detection for details.

• Edge Polarity: it has three modes, including dark to light, light to dark and any.

• Edge Threshold: The edge threshold is the gradient threshold, ranging from 0 to 255. Only

edge points whose edge gradient threshold is greater than this value are detected. The larger the

value is, the stronger the anti-noise ability is, the less the number of edges is, and even the target

edge points are screened out.

• Calipers Number: it is used to scan ROI area quantity of edge points.

• Max. Angle Tolerance: if the angle of target lines is smaller than this parameter value, the

target lines will be determined as parallel lines. Otherwise, the target lines will be determined as

non-parallel lines.

• Reject Number: It means that the number of minimum points that have high error to be

excluded from fitting. In general, if there is a great number of points excluded from fitting, its value

should be set higher. For better results, it is recommended to use it in combination with the parameter

of distance to remove.

• Distance to Remove: It means that the maximum pixel distance from the outlier to the fit

circle. The smaller the value, the more points are excluded.

• Filter Size: it is used to filter noise. The larger the value is, the stronger the anti noise ability

is, the less the number of edges is, and even the target edge points are screened out.

• Projection Width: In the ROI, several edge points are distributed in a circle to search for

the ROI. This parameter describes the width of the area where the edge points are scanned for the

ROI. Increase the value within a certain range to obtain more stable edge points.

• Initial Fit: see Find Circle for details.

• Fit Mode: It has three types, including least squares, huber and tukey. The three fitting

methods only have some differences in the calculation of weight. With the increase of the number

of outliers and the distance of outliers, the least squares, Huber and Tukey can be used step by step.

Quadrilateral Search