---
title: "Find and fix noise"
canonical: "https://help.vicon.com/space/ShogunPost121/1253736498/Find%20and%20fix%20noise"
format: markdown
---
You can identify noise in a **Graph** view:

> ![Noisy data displayed in Graph view of Vicon Shogun Post.](media://f8725a08-5ac6-48a4-a521-2d3f3df5b02a)

It also produces flickering as you play through a take in the **3D Scene** view. You can fix it with the filtering options in the **Marker Editing** panel.

**To fix noisy data:**

1. In a **Graph** view, ALT+drag to select it.
2. At the bottom of the **Marker Editing** panel, expand the **Filter** section, and select whether filtering applies to **Ranges**, as above, or to **Selected Keys**.
3. If you're not sure how much filtering to apply to your data, keep the default settings (**Cut Off**: 0.3 and **Threshold**: 15) and select **Apply**. You can reapply this as many times as required.
4. In the **Graph** view and **3D Scene** view, check that the trajectory is now smooth over the selected range.  
:check_mark: **Tip**: To display a tooltip for any of the controls, hover the mouse pointer over the relevant control.

> Macro (scroll-pagebreak)

### Ensure smooth start and end to filtered trajectories

When you apply filtering, the **Smooth In/Out** option in the **Marker Editing** panel provides smooth blending at the start and end of the filtered section of a trajectory curve.

The following example shows a Graph view of a trajectory curve that requires smoothing.

> ![Graph view in Vicon Shogun Post, showing trajectory curve that needs smoothing.](media://a31c21c4-d3a1-4401-885f-8eac619e7b23)

With **Smooth In/Out** cleared, when filtering is applied, the curve is smoothed, but the start and end does not account for what is on either side of the smoothed section, resulting in a straight line with an unwanted angle at the end.

> ![Graph view in Vicon Shogun Post, showing filtered trajectory curve that needs smoothing at the start and end.](media://3619ac72-df90-48b5-8cc0-bebd8c00f94f)

 For details, see the following steps or watch [Vicon Shogun 1.3 Post Tutorial - Filter in/out Smoothing](https://youtu.be/0csCqSmKe9E) on YouTube.

> Macro (scroll-ignore)
> 
> > Macro (widget)

> Macro (scroll-pagebreak)

To give a smoother start and end to the filtered section of a trajectory:

1. In the **Marker Editing** panel, expand the **Filter** section and ensure **Smooth In/Out** is selected.
2. If you want to change how much of the trajectory is affected on either side of the gap, edit the value of the adjacent field. The default is 0.2 (20%). Smoothing works by blending between the original and filtered result by progressively more or less, across the smoothing range.
  The filtered section is smoothed at the start and end.