2021 Primer on Dual High-Speed Video Recording of a Golf Swing

**bubbtubbs** · 07-13-2022, 06:10 PM

I'm considering setting up my own video recording in my training/sim space as described in the thread but a third, overhead camera (similar to Uneekor) for impact would be a nice addition.

Anybody have experience with three cameras? If so, how is the memory and cpu usage when running those in conjunction with simulation? Not opposed to the idea of using one of my slightly older gaming rigs to run the recording software standalone but it would be convenient to have them all in the same place with the same data for reference and instructional purposes.

**Reiner** · 07-16-2022, 05:50 PM

Using a top camera that exactly is aligned on the center line of my system.
The camera is an IDS-Camera 3140, having the Python 1300 color-sensor having a 15mm lens F1.2.
You can see the pictures below that is an added picture of the single frames the camera is recording at a speed of 500fps.
The maximal fps the camera can record at regular frame size is 165, but reduzing the height of the frame to 256 allows to increase the fps to even more than 500fps.
Attached are also pictures using 200fps. However, what is more important is the shutter-speed. It is set to 500 microseconds to reduce blurring.
Using such low values, you need a lot of light. I'm using 2 x 200W absolute flickerfree LEDs (using a dimmer to adjust the birghtness) and a 40W spot centered to the ball from the top.

Comment on the cameras I use: (IDS 3140 Rev. 2, sensor: PYTHON1300, Color), Basler MONO 1440x1040 Sensor IMX273 Mono
Due to high speed recording and more easy post processing of the videos I use MONO recording exclusively. The colors doesn't give further information to me.
Under these conditions, the Basler needs much less light and results in more crips images. So the IMX273 Mono sensor is a good choice to me and affordable.

Regarding the CPU it is difficult to say, not knowing your computer. I'm personally using the video analysis exclusively on the range (Skytrak). If I play a round on TGC, it rather disturbes me.
My personal exprience is the following:
1 recording Kinovea-Instance uses about 30% CPU-Load on an i5, 20% on an i9 (MONO)
1 replay Kinovea-Instances uses about 5% CPU-Load (MONO)

So on an i5, more than 2 high speed cameras may not be possible, except, you reduce the fps and frame size.
On an i9/9900 I have 2 cameras at 200fps (about 1024/1024 framesize, front view and down the line) and 1 top camera 500fps (1024x256 frame size, Mono)
Adding the Skytrak - Range the total CPU-load is about 70-80%.

Below you can find some images of the top camera. It is very interesting what happens with the club during hitting the ball and how it results in the ball flight path. Sometimes it is really different than expected (at least to my knowledge).

Reiner

Attached Files

**PantsParty7** · 07-30-2022, 07:55 AM

Trying to learn more about cameras. Does this one look like a good option? Seems so to me. I just don't know enough yet (especially about the lenses needed to capture a swing from about 10 ft).

**PantsParty7** · 08-03-2022, 03:27 PM

I ended up getting the camera I asked about above. It works pretty well most of the time, but I'm getting some weird flickering. I can't quite figure out what's causing it yet. I can post a video later, but I was just wondering if anyone else has noticed anything similar with this camera. It doesn't quite seem like a lighting issue, but more of an issue with the camera itself. Not sure, though...

**deepakvrao** · 11-22-2022, 04:49 PM

Would this be a decent camera for swing recording?

UC10MPC_ND_BH36: 720P USB Global Shutter Monochrome Box Camera OV9281 with 95 degree non-distortion Lens (spinelelectronics.com)

**deepakvrao** · 11-23-2022, 03:16 AM

Anyone use this for swing recording? Impressions? How far behind/to the side would it need to be to capture a full swing?

https://store.spinelelectronics.com/...YtZhQ3zPLREvJ_ xm6TdlZyuOlHOVtmdfQStHdad7lL_Vpkjc

**eezetee** · 02-25-2023, 09:02 AM

I've got Kinovea 0.95 working well with my cheaper ELP cameras (plan to donate to Jean-- Great software)

My quesiton is this, if I don't want a second window because I run Kinovea in the background, can I still use VLC to play the latest capture?
Anyone know how to trigger something like VLC to grab the latest file in the directory and play it?

or if Kinovea is the best way to play it, how to set up a second window for autoplay whnever a new file is placed in a folder?

Thanks much!

**preludesam** · 02-25-2023, 02:16 PM

Yea you can open another instance of Kinovea and use a Replay Folder Observer. It grabs the latest capture and loops the replay. It’s in the user guide for Kinovea. You can find it on the website. Let us know if you can’t figure it out and I’ll attach some screen shots.

**eezetee** · 02-26-2023, 06:41 AM

Thanks preludesam. Would that solution be preferable to a VLC instance that is launch, plays the video, then closes?

I'm using Golf Club 2019 and would like an overlay image to pop up.

**preludesam** · 02-26-2023, 04:37 PM

I’m unsure about using VLC. I just have a Replay Folder Observer open on a different monitor that loops the last capture.

**GReeNORB** · 10-05-2023, 05:14 PM

Originally posted by opticsguy View Post

There are a few 125°+ low distortion M12 lenses with F/1.8 that are compatible with most cameras if you use the correct adapters. You can accurately calculate the wide-angle FoV of any of the M12 lenses on our page, with whichever camera you decide to use. These output values include distortion, etc..

Our scene angle of view calculator can also help you figure out the camera+lens FoV combination which you need.

According to their engineering team, the M12 lenses won't work with the Daheng MER2 as they won't focus...

Anyone else here using the MER2? What lenses are you using? I have a fairly short space to work with - 8 foot behind, 5 foot face-on - and I'm looking for decent non-distortion lenses to use. The Arecont MPL33-12A have also been discontinued, sadly.