Video Inspection Software User’s Guide
Edge Characteristics Requiring Single Point Acquisition When a single point is desired at a specific location along an edge, the Vtouch probe should be used. The Vtouch probe acquires a single point at an edge location specified by the operator with a single press or click on the video window image. Typically, explicit feature measurements are performed, and the individual points are probed at the desired locations along the edge of a given feature. For edges that have poor edge contrast, the manual teach procedure can be performed prior to utilizing the Vtouch probe to improve the edge detection performance. To use the Vtouch probe, select the Active crosshair in the probe menu. Probe the desired points by pressing or clicking on the edge where you would like to acquire a point. Features that Extend Beyond the Field of View In the M3 software, groups of acquired points are assigned to a particular feature measurement based on the probe that was used to capture them and whether the feature measurement was initiated explicitly by selecting a feature type prior to probing points. The example shown here represents one of the most compelling reasons for explicit feature measurement : features that do not fit within the field of view (a single video window). Because manufactured parts are never truly perfect and therefore deviate from perfect form, the M3 software might require the specification of a feature type prior to collecting groups of points. Explicit measurements will ensure that the desired feature is always returned upon completion of a measurement.
Feature distributed over four video windows
NOTE A detailed example of measuring beyond the field of view is provided in Section 4: Measuring, Constructing and Creating Features.
Probe behavior in program playback Part programs are recorded as measurements are performed. During program playback, the part program remembers the approximate probe position and gradient of each edge that was recorded as part of a feature measurement. As program playback proceeds, the system simply moves to the next recorded position to find an edge. When an edge is found it must be similar to the recorded edge at that position to be considered a valid point for acquisition. Thus, program playback can be viewed as a collection of stage positions and their associated candidate points based on the recorded edge parameters of measured features. The video probe used for the recorded measurement is inconsequential to the way points are collected during playback. Once part registration has been established, the system advances to the next programmed stage position with a screen press or Enter button press in manual systems and occurs automatically in CNC systems. All valid candidate points that fall within a given field of view will be collected automatically until the feature measurement is complete.
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