This section describes optimal camera settings to ensure optimal tracking.
Figure 1. One possible camera setup and desired field of view.
To avoid issues related to image quality, the following precautions should be taken:
- 3840x2160 (4K) resolution.
- Codec H264 with maximum bitrate 8192 kbps.
- Widely accepted video format, e.g. (seekable) HLS stream.
- Appropriate color balance, similar in both pitch halves.
- Appropriate focus settings to reduce blur.
- Shutter speed at least 60 Hz.
- Frame rate at least 25 FPS.
- No WDR or HDR settings in camera.
To avoid tracking issues, the cameras should be positioned as follows:
- At least 80 degrees field of view.
- At least 10 meters above and 4 meters from side lines.
- Maximum 0.25 meter distance between cameras, ideally the right hand camera covers the left hand side of the pitch and vice versa. Stationary mounting surface - vibrations impairs tracking.
- Behind the player benches.
- The cameras should be positioned so that they are not exposed to direct sunlight. Very bright sunlight can result in lens flares, exposure issues and suboptimal white balance. This can be avoided with a sun shield and ensuring a clean lens.
- The camera positioning should be chosen so that potential occlusions are avoided. This can be from a variety of things: smoke, flags, sun blinds, bleachers, poles, ropes ors cables. Stationary or moving objects occluding the pitch will impair the tracking.
Figure 2. Example of accepted camera angle.
Figure 3. Example of too low camera angle.
Updated on 02 Jun 2019