Stereo 3D vision cameras
Standard CX 2 cameras can be setup in 3 ways
1. Classic X,Y
The Classic X,Y is the standard setup with one camera at floor level pointing across the enclosure left to right (the Vcam)
- to capture the vertical launch and speed of the ball -
and other (the Hcam) mounted on the ceiling on the center line pointing straight down - to capture the ball path, left or right.
Advantage: Greatest FOV (field of view) for both ball height and path. Disadvantage: cameras are more time consuming to calibrate
2. Parallel stereo
This method has both cameras mounted on the ceiling - some 60cm / 2ft apart - and pointing straight down
Advantage: Easier to calibrate. As cameras are only 60cm / 2ft apart the system can be enclosed in one case (the CX Surround case)
Disadvantage: Limited FOV
3. Converging stereo
This method has both cameras mounted on the ceiling but 8 to 10 ft apart and pointing inwards to the enclosure center line
Advantage: Easier to calibrate. Greater FOV than the parallel setup. Disadvantage: FOV still more limited than the X,Y setup
CX Surround 3D stereoscopic ball and club tracking
CX Stereo using standard H and V cam converging cameras
Available in both Lux and Standard casings
The CX Stereo / CX Surround is available in three versions.
All CX Stereo systems come complete with built-in IR Lighting, full frame cameras, power supplies, cables and a line scan trigger camera.
System includes TGC 15 course software plus RC single course software !
CX Stereo / CX Surround club tracking options
The system is avalable with 3 types of club tracking cameras
1. Single monochrome camera club tracking - motion trace -club face angle, club path and speed
2. Dual color camera club tracking - freeze frame - club face angle, club path and speed
3. Optical sensor tracking
Vcam/Hcam conversation to stereoscopic vision
Current users of the classic X,Y Vcam and Hcam ball tracking system can simply convert their cameras to stereoscopic vision systems too at no extra charge
Some amount of calibration will be required though. Instructions on how to do this are published on the link below.
CX Surround / CX Stereo Q & A
How does the GSA Golf CX Surround / CX Stereo compare with the GC Hawk?
i.e. is the GSA Golf Surround a poor man's GC Hawk like the SkyTrak is a poor man's GC2?
Well, I'm sure many will make this comparison and - in fact - we do too.
At present we don't have enough information about the GC Hawk to make a direct comparison but it would appear that the two systems are quite similar.
Both systems use a stereoscopic method to determine ball launch angle, speed and path and are ceiling mounted .
The fact that the GC Hawk is nearly twice the length of the GSA Surround (7.6 ft long compared to 4.1ft with the Surround)
indicates that they are using a converging stereoscopic camera setup - in contrast to the CX Surround's parallel camera setup.
Presumably this is to increase the detected path range of balls when the unit is mounted 6ft or so away from the player.
The CX Surround - in contrast - is using a parallel stereoscopic method that restricts the ball path range if mounted that far away from the player.
However, as the CX Surround is mounted only some 3ft away from the player then this ball path range is just as great. i.e. +-25 degrees.
The CX Stereo - however - has it's cameras mounted 8 to 12ft apart so this will be more of a direct comparison.
Does the GSA CX Surround also detect club head data?
Yes it does.
The CX3 Surround and CX3 Stereo features a 3rd camera dedicated to this task.
I'm assuming the GC Hawk does too.
The question begs though - does the GC Hawk also require that tracking dots be applied to the clubs like their GC Quad and GC HMT?
My guess is that it does. Note that I'm only assuming this based on their prior systems so I may be mistaken with this assumption.
Does the GSA CX Surround / CX Stereo also detect ball spin?
As such no, but our a Bcam system ball spin cameras can easily be added to it.
I'd be interested to see how the GC Hawk measures ball back spin from cameras mounted on the ceiling viewing the ball from above though.
Especially with the balls not having any markings on them and the cameras - in contrast to the GC2 that is only 2ft away and viewing the ball from the side where back spin rotation can easily been seen -
the GC Hawk is mounted some 9 or 10ft away on the ceiling and viewing the ball from above where back spin rotation is very difficult to detect even with markings let alone without markings.
The above images show how back spin can easily be seen when viewing the ball from the side (as does the GC2 and our Bcam system). Viewing from the side, a full 360 degrees of rotation can be seen and thus spin rate measuring accuracy will be high.
In contrast, if viewing the ball from above, the max amount of rotation viewable by the camera would only be around 30 or 40 degrees before the reference markings (virtual or real) would rotate backwards out of view of the camera.
Note that the standard method of measuring ball spin with cameras is to grab two images of the ball at a set time delay between the 2 frames.
Image processing then detects a matching marking or dimple pattern in both frames that is used to determine the amount of rotation that ball has made within the frame time delay.
Simple math procedures then determine the spin rate in RPM.
Compared to the side view method, I doubt that the same degree of spin rate measurement accuracy can be obtained with overhead mounted cameras.
What is the difference between the CX Surround and CX Stereo systems?
Just the casing.
The CX Stereo features the exact same cameras and electronics as the CX Surround but is split into two casings.
However, whereas the CX Surround - due to its single casing - is confined to using parallel stereoscopic cameras, the CX Stereo - due to its separate dual camera casings - can be setup as either a Parallel or Converging stereoscopic system
or as a standard X,Y system. So you have the best of 3 worlds with the CX Stereo.
What is the difference between the CX Stereo and the CX2?
Just the software options to run as in a stereo or clasic X,Y configuration.
How does the GSA CX Surround / CX Stereo compare with the GC Hawk price-wise?
Not knowing yet what the price of the GC Hawk will be I can only guess, but all indications are that the GSA CX Surround or CX Stereo will only be around a third or a quarter of the price of the GC Hawk.
At present - and based on Foresights other product prices and a few golf sim forum - I'm estimating that the GC Hawk will be in the $15,000 to $18,000 range while the CX Stereo / CX Surround is in the $3,500 to $5,000 range.
Of course, I could be totally wrong on this price estimation . Maybe the GC Hawk will be available for just $2,999. Doubt it though.
Even so, and even at $15,000 or $18,000 , I have no doubt that the GC Hawk will be very successful. From what I gather, Foresight already have 500 pre-orders (i.e. $ 9 million )
In contrast, GSA Golf have received about 5 Surround orders to-date, so I don't expect our annual sales of the CX Surround to be anywhere near as high as the GC Hawk (probably more in the 20 to 30 per year range).
I could equally be wrong about that too though.
In theory, if the annual sales of the GC Hawk at 18k are in the 500 range then the annual sales of the GSA CX Stereo - that essentially does the same at only a quarter of the price - should be in the 2000 range.
Martin Gardiner, CEO and founder of GSA Golf
Click above to read more about the CX Surround
Click above to read more about the CX Stereo
3 optional camera setup configurations
1. Classic X,Y 2. Parallel stereo 3. Converging stereo
The above video is from customer Keith showing putting using the new Converging stereo setup.