Drone Face Chase

This is the app that allows you to fly the drone called "Tello".
In addition to regular flight operations, "Face Chase" function by detecting your face via Tello's camera is equipped. You can save the camera image as a video, and can export the saved video file via "File" app.

The face chase function automatically controls the back and forth movement based on the first detected face size. In the vertical and horizontal directions, Tello automatically flies back within the range specified by "Face Chase Settng".

The face chase function can be adjusted within the following range.
- When moving left and right, select whether to move left or right or rotate.
- Specify the chase range of vertical and horizontal directions (range of 10 to 90% of the camera image size)
- Specify the forward and backward chase distance (range of ± 10 to ± 90% based on the size of the face that was first detected)
- Specify chase speed (10-100)
- Specify frequency of face detection (1 to 10 times per second)

Face chase may be difficult depending on the position between Tello and the user and the above adjustments. Please make the optimum adjustment by yourself according to the purpose of use. In addition, the face chase function is intended to work for one person. When multiple faces are detected, the size of the face of the first detected person will be used as base face size, and after that, every time multiple faces are detected, the first detected face will be chased. It is not guaranteed whether or not the target person will be chased.

Other features:
- Flight speed switching during normal flight operation (Slow = 50 or Fast = 100)
- Camera image display size switching (fit or enlarged)
- Battery level display
- Camera video recording function, recorded video playback function, and recorded video file export
- WiFi setting screen display function

Please be informed that this app is designed for personal fun, so please do not expect high accuracy for face chase function.