Knowledge Base

The Advanced Research Module

Main Topics

• Introduction to the Advanced Research Module
• Analyze multiple subjects per video
• Track the test participant's gaze when presenting stimuli

Introduction to the Advanced Research Module

The Advanced Research Module enables you to analyze multiple faces in a video, for instance participants in a focus group that were filmed with a single camera. See Analyze multiple subjects per video for the steps to follow.

Please note that you cannot use any of the following analyses in a multi-subject analysis: Vital Signs analysis, Voice analysis and Consumption Behavior analysis.

With the Advanced Research Module you can also track the gaze of a test participant. For gaze tracking you need the Stimulus Presentation Tool. After the test you can visualize the stimulus with a gaze overlay. You can also create a heatmap showing the hotspots on the stimulus where the participant looked the longest. See Track the test participant's gaze when presenting stimuli.

Please note that you cannot combine the Advanced Research Module with Baby FaceReader.

Analyze Multiple Subjects Per Video

Aim

To analyze facial expressions of multiple faces in a video.

Prerequisites

You have a pre-recorded video to analyze in FaceReader. It is not possible to analyze facial expressions of multiple subjects when you do a camera analysis.

Procedure

1. On the Multi-subject Sources tab click the Add multi-subject video icon or from the Project menu select Multi-Subject Sources > Add Multi-Subject Video.
2. Optionally, click the Analysis settings button to view or adjust the settings. See Settings for the current analysis for more information.
3. Position the video to where you want to start the analysis. Optionally, deselect the Visualize results checkbox to speed up the analysis.
4. Click the Start analysis button. The track bar shows the progress of the analysis, the analysis speed (in fps), how many minutes:seconds.milliseconds of the video have been analyzed, the duration of the video and whether the video has audio.
5. Click the Stop Analysis button to stop the analysis or wait until the video has been fully analyzed. FaceReader shows how many participants were detected in the video and for how many minutes/seconds each participant was detected.
6. Optional — Select participants to merge them, for instance because a participant walks out of the camera view and FaceReader labels him/her as a new participant when he/she enters the camera view again.
7. Select the participants that you want to add to your project and click Add to project and Yes to confirm your choice. You can add a maximum of eight participants. The participants are added to the Participants tab and the Multi-Subject Sources tab of the Project Explorer.

Participants Tab

On the Participants tab you can find the individual analyses per participant. When you hover with your mouse over the video icon of one of the participants, you will see the first face image that could be analyzed. In this way you can identify who is participant 1, participant 2, etc.

Click the magnifying glass button next to one of the analyses to open it. A standard analysis view will open. Click the Show framing icon in the Analysis Visualization window to view who is participant 1, 2, 3, etc.

On the track bar you can see in what parts of the video the participant face could be analyzed. The rest of the data is shown as gaps (shown in white).

If you analyze multiple videos of the same participants, FaceReader will not recognize the participants in the second, third etc. video. If you like, you can bring the analyses together. Right-click on an analysis in the Project Explorer, click Analysis and then Move Analysis To Other Participant. Select the target participant and then Yes to confirm the move.

Multi-Subject Sources Tab

On the Multi-Subject Sources tab the participants are grouped by source. Double-click Participants or click the icon next to Participants to get an overview of the participants that were detected in the video and added to the project. The overview also shows for how many minutes/seconds each participant was detected.

Click the source button on the Participants tab or the Multi-Subject Sources tab to view the Multi-Subject Source window again. Click Exclude/Merge if you want to exclude/merge (more) participants.

Please note:

• You cannot calibrate participants in a multi-subject analysis.
• You cannot add analyses to multi-source participants.
• You cannot re-analyze the video.

Track the Test Participant's Gaze When Presenting Stimuli

Aim

To assess what details in a stimulus attract the test participant's attention.

Prerequisites

• You have installed the Stimulus Presentation Tool.
• You selected Gaze tracking in the Settings > Analysis options.

Procedure

Define a test in FaceReader and select Perform gaze calibration.

See Define a test and Carry out a test with the Stimulus Presentation Tool under Project Analysis.

Source: FaceReader 10 Reference Manual (Help), Noldus Information Technology