---
title: "Find and fix noise"
canonical: "https://help.vicon.com/space/ShogunPost115/276210376/Find%20and%20fix%20noise"
format: markdown
---
You can identify noise in a **Graph** view:

![image](media://930b56c1-9d7b-4ddf-99ce-411392095946)

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.

### 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.

![image](media://7f55196a-292f-4df6-b4f9-b39e91a48f1f)

> Macro (scroll-pagebreak)

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

![image](media://13c0da9f-5ec8-457f-a597-199851cf463c)

> Macro (inline-media-image)

  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.