For some applications, we would like to set the camera exposure so that a specific area of the video has a set average color lightness. Thanks to ImageCapture API, it is now possible to adjust the camera driver settings directly in the web browser (like exposure, saturation, brightness, ...).
But is is not supported by all browsers yet. You can check the compatibility table here.
/demos/: demonstrations/helpers/: helpers to get the video feed through WebRTC or to initialize the WebGL context,./JeelizExposureController.js: main script of the library
Included in this repository:
/demos/basic: the exposure is tuned according to an area at the center of the video. It should be served with an HTTPS static server.
Other demonstrations:
- Camera auto exposure adjuster: The user's face is detected and tracked, then the exposure of the camera is adjusted according to the face lightness. It is useful when there is a strong backlight or if the ambient luminosity is low. The demonstration is available on Jeeliz GlanceTracker Github repository. You can check the live demo here: jeeliz.com/demos/glanceTracker/demos/cameraExposureAdjuster/.
If it does not work on your computer, this is a video screenshot:
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To run this library, you need:
-
A browser implementing Image Capture API. The compatibility tables are here: developer.mozilla.org/en-US/docs/Web/API/ImageCapture,
-
A webcam which driver allows to adjust the exposure (not a Mac).
This API is still very experimental and its specification may change before it becomes implemented on Firefox and Edge, then Safari.
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