DirectShow Sample Application: Machine Vision (Measurement, Gauge, Quality Control)

The gauge sample demonstrates the use of the MV Gauge filter and shows a possible application area of this filter. The user is able to create areas of interest by clicking on the smart control and to define thresholds which limit the allowed result of the filter outputs. These results are visualized using LED and display controls.

This and other sample applications can be found in the MV Development Kit installation directory.

Filter Graph Summary

The filter graph configuration for the Gauge sample contains a MV Camera Undistortion filter to create a calibrated video stream and the MV Gauge filter for sub-pixel accurate measurement. For each of the eight output pins of the MV Gauge filter there are also two MV I/O Comparator filters for the thresholds, a MV I/O Logic filter, a MV I/O Not filter and two MV I/O Renderer  filters for the results.

The Application

This sample consists of the main form and four dialogs. The main form contains the smart control, eight LED controls, eight display controls and a few check boxes and buttons to configure the video output.

In the camera configuration dialog you can choose and setup the video source, open a file for the MV Camera Undistortion filter and change the units per pixel shown in die display controls of the main form.

The gauge dialog is identic to the second property page of the MV Gauge filter. Here you can enable/disable the output pins of the filter and choose which area of interests are used for each one.

In the I/O displays dialog it is possible to define the prefixes/postfixes shown by the display controls and to change the thresholds, which effects the LED controls.

With the remove dialog you can delete areas of interest.