# Inspect Screws

Screws or any other cylindrical object need to be rotated during inspection. Looking not only at one specific line along the rotation axis, but at the full object over several images, brings the advantage that you can see the surface and defects at different angles to the camera and the illumination. For instance, some defects will show best when they are on the center line, others will show better when they are slightly off to the sides.

Since the Red Analyze Tool does not rely on the precise positioning or orientation of the object, it can essentially operate in open loop. In other words, you can take a series of images (movie) of the rotating object and present them directly to the Red Analyze tool. In this particular set of images, however, the screws are moving across the entire image such that it is advisable to first use a Blue Locate Tool to localize and crop the screw before feeding it to the Red Analyze tool.

###### Learning Objectives

- Use the Blue Locate tool to localize and track fuzzy features.
- Generate a geometric model to find the screw's pose.
- Configure a segmenter to process the screws by a Red Analyze tool.
- Implement the Training Passes parameter to improve detection results.