# trackFaces method

void trackFaces(

1. Image image,
2. DetectedFaceList detectedFaceList

)

Tracks faces in an image and update their info in a DetectedFaceList object. In a realtime process, one must use this function instead of DetectFaces() to keep the face IDs stable in time. Note: The algorithm searches for faces in the range (16px;512px). If the image is too large to fit this range, one must resize it before the detection process. Important: Loading a `FaceDetector` model is required to use this function. Warning: This function is deprecated: use the FaceTracker module instead.

param image Source image to process. param detectedFaceList List of detected faces. throws FaceException An error has occurred during Face Library execution.

## Implementation

    void trackFaces(Image image, DetectedFaceList detectedFaceList) {
      var err = faceSDK.id3FaceDetector_TrackFaces(_pHandle.value, image.handle, detectedFaceList.handle);
      if (err != FaceError.success.value) {
        throw FaceException(err);
      }
    }