The VisTrak LX series
VisTrak LX1 & LX2
Launch monitors
Note: The LX Launch Monitors are real time systems.
i.e. there's no big lag time after a ball is struck and the ball launching in the game software.
Unlike systems form other manufacturers,
that have up to a 4 second delay between the user striking the ball and it launching in the game software
LX 2 2 hi-res USB3 cameras with club tracking, stand-alone launch monitor
Beta test version $ 2,199 $ 2,999
The new VisTrak LX 2 features dual hi-res USB3 stereoscopic cameras.
Data captured: Ball speed, ball launch angle, ball path and ball spin rate.
Club speed, face angle and path.
The LX2 has increased ball path accuracy compared to the LX1
LX 1 single hi-res USB3 camera with club tracking, stand-alone launch monitor
Beta test version $ 1,699 $ 1,999
The new VisTrak LX 1 features a single hi-speed USB3 camera.
Data captured: Ball speed, ball launch angle, ball path and ball spin rate.
Club speed, face angle and path.
The LX1 is designed to be used as a simple to use, stand-alone launch monitor .
LX 2 2 hi-res USB3 cameras with club tracking, stand-alone launch monitor
The new VisTrak LX 2 features dual hi-res USB3 stereoscopic cameras.
Data captured: Ball speed, ball launch angle, ball path and ball spin rate.
Club speed, face angle and path.
The LX2 has increased ball path accuracy compared to the LX1
Alpha/Beta test versions now available
$ 2,199 $ 2,999
LX 1 single hi-res USB3 camera with club tracking, stand-alone launch monitor
$ 1,699 $ 1,999
The new VisTrak LX 1 features a single hi-speed USB3 camera.
Data captured: Ball speed, ball launch angle, ball path and ball spin rate.
Club speed, face angle and path.
The LX1 is designed to be used as a simple to use, stand-alone launch monitor .
Alpha/Beta test versions now available
LX Dimensions 25" X 10" X 3" Weight : 7 lbs
How the VisTrak LX works ?
The LX1 uses a single USB3 hi-speed camera to capture mulitple frames of the ball and club before and after ball strike.
Data captured: Ball speed, Launch angle, ball spin, club speed and club AOA (Angle of Attack).
The LX1 is like the VisTrak Eagle, only floor mounted.
How the VisTrak LX launch monitor works ?
The LX2 uses 1 hi-speed USB3 camera and 1 (1280 x 960 pixels) hi-resolution camera.
When started, the system first looks for the ball on the mat running at a low frame rate (50fps) using the Right camera.
During this period, the bright green LED on the unit will flash.
Once found, the Left camera grabs an image of the ball too and - using stereoscopic methods - determines the distance the ball is from the unit when placed on the hitting mat.
The Right camera is then switched to hi-speed mode (590 fps) with a reduced ROI (Region of Interest) and looks to see if the ball moves.
The system is then armed and ready for swing and the bright green LED will stay constant ON.
Once movement is detected (usually a ball strike), the Right camera is switched back to hi-resolution trigger mode.
Software triggers then trigger both cameras to capture 2 hi-res images of the ball in flight.
However, the Left camera is programmed to grab the image a certain time later ( usually around 1 ms later).
This trigger delay allows the system to grab the 2 frames at any frame rate (usually 1000 fps).
Image processing of the 2 hi-res images detects precise ball spin and ball speed; and stereoscopic methods determine the distance the ball in flight is away from the unit
and thus -- using the previously determined distance the ball was away from the unit when on the mat - the ball path can be accurately measured.
The main difference between the LX1 and the LX2 is that the LX1 cannot detect very accurate ball path.
The LX2 - on the other hand - uses a far more accurate hi-res camera for ball path dierection and can capture spin rates at very hi-speed ball speed and very high spin rates.
Ball spin detection test results
VisTrak LX3 - club tracking test images
LX camera calibration
All LX launch monitors are calibrated using a checkered board.
Calibration is required to adjust for lens distortion so that ball path and LA can be accurately measured.
LX ball spin detection method uses the ball logo as reference so that special spin dot balls are not required.
As long as the regular balls feature a black manufactures logo or name, special printed balls are not required.
LX camera calibration explained
The above image shows how the ball size image will change depending on where in the image the ball is detected by the camera.
Even though the ball is traveling in a straight line ( as in the above image), the image of the ball gets smaller the further it is away from the camera.
Camera calibration - based on checker board image segment adjustments - corrects this issue.
The screen is divided into segments based on the checker board image.
Each of the 140 segments (14x10) has a size correction value assigned to it,
which is derived from the size of the square compared to the size of the square in the center of the screen.
So if a ball is located in a specific screen segment, the corresponding screen segment adjustment value will be added to its perceived size to bring it back to its original size.
Should the ball launch be a perfect straight shot, then the image of the ball size will be exactly the same in each screen segment after calibration adjustment.
Should, after this adjustment, the ball image size increase or decrease from the norm, then we know that the ball's direction is either left or right.
Mathematical calculations can then be used to determine the true ball path left or right.
September 5 1:15 pm
- V 9.4.1.1 Beta
VisTrak LX 1
Issues with correct spin line or ball logo detection when using the LX1 now resolved.
Note that spin line or ball logo detection is only made in the two ball speed frames.
The two ball speed frames are the two frames of the 32 frame video capture that are used to measure ball speed.
These frames are usually next to each other (i.e. frame 5 and 6 ) with the LX
August 28 2:30 pm
LX1 / LX2 / Quantum F / Quantum FB
CP Alpha test update
- V 9.4.0.9 Beta
The new ball spin functions for the LX and Quantum F systems are now ready for Alpha testing.
More explicit operating instructions will be published on this web site over the weekend.
Quantum F / Quantum FB
Quantum F ball spin detection using hi resolution ball images
August 27 3:50 pm
Ball spin detection using the ball logo
The new VisTrak LX software is nearly ready. First Beta versions should be available tomorrow late afternoon or on the weekend.
VisTrak Quantum F software is also nearing completion and will also be ready tomorrow or over the weekend.
Note that the Quantum F ball spin detection method is the same as the LX method except that it is using HiRes images of the ball.
Current spin detection method is the "Spin line / logo on ball" method.
"Pattern match" and "Spin dots on ball" methods will be available later if there's a demand for it.
Most will probably not want to use spin dot balls though.
LX integration with CX2 and PX2 systems for use just as a spin detection system should be ready next week too.
August 26 6:15 pm
Ball spin detection using the ball logo
Two scan directions are used to detect the best outer limits of the ball logo on the ball with the LX and Quantum F systems
The LX and Quantum F ball spin detection CP update should be ready this coming weekend.
August 25 4:15 pm
LX ball images
The LX2 features 2 cameras - a cx HiRes camera and the VisTrak hi-speed but loRes camera
The above image shows the difference in image quality between the two cameras.
However, we don't require a hiRes image to detect the ball logo in order to detect spin rate.
i.e. the loRes VisTrak camera does this just as well.
The hiRes camera in the LX is required in order to better detect ball path based on comparing ball image sizes in the frames.
The hiRes camera is - of course - also used to detect the ball logo angle on the ball
and the difference between the 2 measured logo angles is used to calculate the amount of rotation and thus the ball spin rate.
August 20 5:30 pm
VisTrak CX2 or Stereo to VisTrak LX HiRes converstaion kit
You can easily convert your CX2 cameras to function as an LX HiRes ball spin and LA launch monitor to function with your VisTrak Eagle with this new converstion kit.
Kit consists of a camera mounting base, camera mounts and trigger cables.
Price is $99. Available on the Kits and Parts page. (click above images).
Note: The VisTrak Eagle combined with the LX HiRes is called "Quantum F" . (The F standing for "Floor mounted")
August 20 4:30 pm
VisTrak Ball spin detection
The new LX 2.1mm lenses we're tried out today. The greater FOV is great but the ball markings are harder to see.
I had to code in a ball zoom function to confirm that the markings (i.e. logo) is detected correctly. (Believe it or not - that function alone took 5 hours work).
I hope to have ball spin detection using the ball logo for all the LX and Quantum systems ready by the end of the month.
VisTrak LX Setup
... more instructions to follow
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