mirror-camera¶
Current version: 1.0.0 See version history.
This plugin shows a live feed of the participant's camera. It can be useful in experiments that need to record video in order to give the participant a chance to see what is in the view of the camera.
You must initialize the camera using the initialize-camera plugin prior to running this plugin.
Warning
When recording from a camera your experiment will need to be running over https:// protocol. If you try to run the experiment locally using the file:// protocol or over http:// protocol you will not be able to access the camera because of potential security problems.
Parameters¶
In addition to the parameters available in all plugins, this plugin accepts the following parameters. Parameters with a default value of undefined must be specified. Other parameters can be left unspecified if the default value is acceptable.
| Parameter | Type | Default Value | Description |
|---|---|---|---|
| prompt | html string | null | HTML-formatted content to display below the camera feed. |
| width | int | null | The width of the video playback element. If left null then it will match the size of the recording. |
| height | int | null | The height of the video playback element. If left null then it will match the size of the recording. |
| button_label | string | "Continue" | The label of the button to advance to the next trial. |
| mirror_camera | bool | true | Whether to mirror the video image. |
Data Generated¶
In addition to the default data collected by all plugins, this plugin collects the following data for each trial.
| Name | Type | Value |
|---|---|---|
| rt | int | The length of time the participant viewed the video playback. |
Simulation Mode¶
This plugin does not yet support simulation mode.
Install¶
Using the CDN-hosted JavaScript file:
<script src="https://unpkg.com/@jspsych/plugin-mirror-camera@2.0.0"></script>
Using the JavaScript file downloaded from a GitHub release dist archive:
<script src="jspsych/plugin-mirror-camera.js"></script>
Using NPM:
npm install @jspsych/plugin-mirror-camera
import mirrorCamera from '@jspsych/plugin-mirror-camera';
Examples¶
Show the camera feed
const init_camera = {
type: jsPsychInitializeCamera,
}
const mirror_camera = {
type: jsPsychMirrorCamera,
}