# Inspecting Fuses

The code of this application and the images used are available in your public document folder (C:\\Users\\Public\\Documents\\Allied Vision\\eVision 26.10):

## Application objective

This application demonstrates how to inspect and check if a given type of fuse is blown or not.

The inspection is based on images featuring a type of fuse commonly used in the automotive industry.

#### NOTE
To run this program, you need the EasyFind and EasyGauge licenses.

![image](assets/images/2d_application_examples/inspecting_fuses/objective.webp)

The inspection mainly consists in finding the position of the fuse and positioning the measurement tools accordingly.

## Creating an EasyFind model file

Using eVision Studio, create and learn an EasyFind model, as illustrated:

1. Set a ROI (region of interest) to define the pattern (the red rectangle in the illustration).
2. As the orientation of the fuse may vary, set a rotation tolerance of +/- 45°.
3. Save the EasyFind model file.

#### NOTE
You will then load this EasyFind model file at the start-up of your application.

![image](assets/images/2d_application_examples/inspecting_fuses/initializing_1.webp)

## Creating an EasyGauge model file

Using eVision Studio, measure the fuse leads with `ELineGauge` tools:

1. Create an `EFrameShape` with a center corresponding to the center of the pattern defined previously.
2. Attach the 10 `ELineGauge` tools to the `EFrameShape` as illustrated.
3. Enable the outliers filtering mechanism for all the `ELineGauges`.

#### NOTE
You will then load this EasyGauge model file at the start-up of your application.

![image](assets/images/2d_application_examples/inspecting_fuses/initializing_2.webp)

## Inspecting the fuse

1. To detect a fuse and check that it appears in the field of view, the application performs a geometrical pattern matching operation.
2. If a fuse is found, the application retrieves its center position and its orientation.

#### NOTE
If no fuse is found in the image, the inspection stops.

![](assets/images/2d_application_examples/inspecting_fuses/inspecting_1.webp)![](assets/images/2d_application_examples/inspecting_fuses/inspecting_2.webp)
1. Before triggering the measurement, the `EFrameShape` and its `ELineGauge` tools are accurately placed according to the position and the orientation of the fuse found at the first step.
2. The application uses 2 of the `ELineGauge` tools to determine whether the fuse is blown or not:

- The application records the number of valid transitions along each `ELineGauge`.
- If this number is below a given threshold, the fuse is considered as blown.