Evidence Manager Tutorial 55:

Automatically Detecting Faces


CH1: Overview

CH2: Configuring Evidence Manager

CH3: Managing Devices

CH4: Managing Docking Stations

CH5: Managing Evidence

CH:6 Using Evidence Player

CH7: EM Redaction

CH8: Reference Reads


The Redaction feature automatically identifies faces in the video, and creates yellow bounding boxes around these elements. The elements are then redacted for the duration you specify.

Use this method of redaction, if you want Evidence Manager to recognize faces, and redact them for the duration you specify.
Auto Face Detection includes support for the following:

  • Face directly looking at the camera
  • Face turned to the side
  • Face turned up
  • Face of all skin tones
  • Face wearing glasses

NOTE: Automatic Face Detection

It is possible that the Auto Face Detection method might not detect all the faces in a video. If that happens, you can manually select elements for redaction.

NOTE: Resolution of Video

Evidence Manager cannot auto detect faces in low resolution videos. That is why, use this method only if your video has high resolution.

To auto detect faces:

  1. Make sure you performed all the steps described in Pre-redaction Tasks.
  2. If needed, play the video to determine the elements that need to be redacted.
  3. Locate the redaction options at the bottom of the Evidence Manager window, next to the player controls.

NOTE: Quick Access from the Application Toolbar

Some of the redaction menu options also have quick access icons on the application toolbar. The application toolbar is located beneath the top menu bar.

  1. Click Auto-Redact Faces.
  1. On the Automatic Face Redaction window, do the following:
    • To redact faces for a portion of the video, select that video clip by setting Start Date, Start Time, End Date, and End Time under Select Time Frame.
    • To redact the faces in the entire video, select the Choose entire video check box.
  2. Click Start.

The progress bar displays the progress of the redaction. As Evidence Manager detects faces, yellow bounding boxes with a number appear around elements. The numbers follow a chronology indicative of the order in which the faces are detected. 

As the faces are detected, a video element for each face is listed in the Video Elements for Redaction pane.

After the redaction operation completes, do the following:

  • To view the faces that will be redacted, click the Play button. You will see yellow bounding boxes around each face that Evidence Manager detected.
  • To preview the redacted elements in the video, click the Preview Redaction icon. The icon looks like this:

NOTE: Undetected Faces

Sometimes, Evidence Manager might not detect faces. For example, faces that are partially hidden might not be detected. If you notice undetected faces, you can use any of the manual methods of redaction to redact them. These methods are described in tutorial 55, 56, and 57. 

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