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Frequently asked questions

Which are the sensors used by Capto?


Capto is equipped with nine measurement sensors and five calibration sensors. The measurement sensors are 3 magnetometers, 3 gyroscopes and 3 accelerometers. The calibration sensors are 3 thermometers, a barometer and a hygrometer. The latter are used to adjust the measurements as the environmental conditions change. Capto is equipped with a powerful calculation processor that performs on-board processing of the most significant quantities and the first step of the sensor-fusion algorithm.




What are the accuracy of Capto sensors?


The accuracy of Capto's sensors is very high. For the magnetometer is 5 micro Tesla, for gyroscope is 5 hundredths of a degree per second, for the accelerometer, better than 5 thousandths of degree. This means that it is possible to obtain the estimates of the quantities derived with great precision.




What can be measured with Capto?


With Capto we can measure directly: 3 intensities of the magnetic field, 3 angular speeds and 3 accelerations. From these, with the integration of the gyroscopes we obtain angles values. With the integration of the accelerometers we obtain the movement speeds and, with further integration, the putter positions.




How accurately does Capto measure angles?


There are no systematic errors. Laboratory tests provide us with the following values.
The averages are close to zero for the three angles: face, loft and lie. The dispersion (MSE) around the average is 0.1 ° for the face, 0.2 ° for the loft and next to 0 ° for the lie.




Why is frequency (FPS) so important?


The quality of the measurement of a physical phenomenon depends on the following main factors:
1) number of sensors
2) sensor accuracy
3) frequency of measurements
The number of sensors determines the independent quantities acquired and therefore the reliability and precision of the measurement. In Capto there are nine measurement sensors and five calibration sensors.
Each of the measurement sensors provides an independent value.
Capto combines the information of all the sensors through a complex sensor fusion algorithm.
In the case of vision systems there is only one measuring sensor, like the camera. Even in the case of ultrasound systems there is only one sensor, even if apparently they seem three. In fact, none of the three sensors is able to provide an independent measured value.
The accuracy of each sensor expresses how much the measured value looks like true.
In Capto we measure directly 3 accelerations, 3 angular speeds and 3 magnetic intensities, all with very high precision. The number of measurements determines the level of sampling of the phenomenon.
In the putting strokes you have speed, about 2 meters per second at the impact and angular speeds of about 60 degrees per second for the shaft.
This means that Capto (at 400 Hz), close to impact, acquires a data packet every five millimeters of trajectory and 0.15 degrees of shaft.
A 70 Hz system acquires data every 28.5 mm (more than half a ball) and 1 degree of shaft.
Every value that is found between two successive acquisitions is interpolated and, in a certain sense, supposed. The same point of impact can’t be identified with an accuracy greater than the acquisition step.
Finally, it must be considered that the contact time between the ball and putter varies between 0.2 and 0.4 milliseconds and therefore the more we ascend with the frequencies the better we know the physics of the impact.




At what distance we have to plug the device?


About the distance from lowest side of sensor to sole of putter there is a wide range of possible installation distances. Teoretically it could be from just under the grip to upper the neck. We only need to pay attention to imput the correct value in the putter profile interface. Thats why, normally, we say 40 or 45 cm (about 18 inches) indifferently. Just few notes about shaft deflection and torsion. If shaft is really soft, shaft deflection may be not negligible. Different positions could give quite different results. In this case, if you want high accuracy data, is better to place the sensor at about 20 cm (8 inches) from the sole so to be closer to putter face and minimize deflection's effect.




How to make Capto calibration?


The calibration of CAPTO has a double function.
1) Position the zero of the sensors correctly with respect to the putter face
2) Allow the use of the putter equipped with CAPTO for measuring the slope of the green under the position of the ball.

The calibration must be done every time you will use a different putter. Enter the putter data in the database and click the calibration button. This operation must be carried out on a perfectly leveled and horizontal plane, paying attention to lie the back of the sensor and to square the face. The back of the sensor must be fleeted on table and the face of the putter on the orthogonal line.
Every time the same putter is used, it is sufficient to check its position (distance from the sole of the head) and the perpendicularity, without pressing the calibration button. Both of these operations are extremely rapid and can be done outdoors. It should be noted that at this stage it is not required that the support surface be horizontal, but only that the face of the putter is perpendicular to the sensor back and, of course, pay attention to the distance.
We suggest, in the case of reuse of the same putter several times, to make a mark on the shaft for the rapid positioning of the sensor.




Which is the reference system?


Capto's graphs describe angular and angular rate values, frame by frame throughout all the putt, with respect to a reference system that originates on the putter face at the time of the takeaway. This reference system takes the name of WCS, that is Word Coordinate System as it refers to the global system in solidarity with the terrain.
In the figures it is represented by the triad of brown, green and cyan vectors which are the axes around which the face, loft (shaft) and lie respectively rotate.
The circular arrow represents the positive direction of rotation both for the angles and, obviously, for the angular velocities.
It should be noted that graphs and the stroke path, up to version 2.14 are always expressed with respect to the direction assumed in the moment of takeaway.
From version 2.15 (May 2018 released), only in the case of aim towards a target, they will be expressed with respect to the direction of the target itself.




How many Capto devices already in use?


Up to Jan 2020 we have 850 Capto Users all over the world.




Which is the price?


Capto bundle price is 2080 euro. Include Capto system, calibration tool and loft lie, and level 1 and 2 certifications It is the suggested package




What are the minimum requirements to run Capto App?


Capto App runs on every platform (Windows, iOS, MacOSX, Android). On Windows and MacOSX is only required the possibility to connect to a Wi-Fi in order to use the Capto sensor. Android minimum requirements: -64bit processor (ARMv7 or ARM64 architecture) -1GB available space on the device -2GB RAM iOS minimum requirements: -1GB available space on the device -2GB RAM




Unable to Open Capto App in MacOSX


If you are expecting problem opening the App on MacOSX due to developer origin problem try to open the App by holding the "Control" button on the keyboard, then selecting "Open" and then "Open" again. The App will now start.




What is the instant rotation center and what is Kernel?


A simplified explanation of these concepts can be found here




How to import or export from cloud?


To manage the data within the cloud take a look at this short video tutorial.




About Capto Wi-Fi connection


The Capto sensor connects with the Capto App through a Wi-Fi connection. In order to use the sensor, the device must be connected to the Wi-Fi net of the sensor. Since the device can be connected to a Wi-Fi at once, if you are connected to the Wi-Fi of sensor you can't be connected to the Wi-Fi of the router or the Wi-Fi of other analisys devices (for example) or vice versa.




How does Capto "Live Mode" work?


This mode allows the player to monitor face angle and lie angle values ​​based on the loft angle. The ideal face angles and the ideal lie angles are computed considering the putt plane and the rotation radius of the player generated during the previous sessions. In the same way it is possible to set custom values ​​for these. The data history clearly shows that the loft angle is what the player can control with greater simplicity and accuracy. For this reason it is taken as the primary angle. The effectiveness of live mode is precisely in providing to the player the feeling of the position of the face and the lie as the loft changes.




Which are the 6 degrees of freedom?


6 possible movements of the putter’s head: three translations and three rotations,
= six degrees of freedom (6 DOF) in 3d space + Tempo.
With Capto you can measure 7 DOF with a step of 2.5 millisecond
three coordinates (X, Y, Z) and three angles (Face, Loft and Lie). Three values for the position and other three for the orientation. The first three are lengths, the second three angles




Which are the 3 rotations?


The three degrees of freedom due to rotations about the sweetspot.
Face, Loft and Lie are the 3 angles describing the orientation of the putter head in 3d space.
Face is the angle of rotation about the vertical axis
Loft is the angle of rotation about the frontal axis
Lie is the angle of rotation about the stroke direction axis
.
With Capto you can measure with high accuracy 3d putter angles




Which are the 3 translations?


Graphical representation of the three degrees of freedom due to translation.
Every single frame is a 3d position with 3d coordinates.
You can look at Capto 3d motion putter movement to see X,Y,Z coordinates simultaneously.
2d Projection on planes (othogonal projections) are a simplification
Top view is Path
Front view is Arc
Lateral view is Side
Each view uses a pair of coordinates
Path: X and Y , Arc: X and Z, Side: Y and Z
.
With Capto you can measure with high accuracy 3d putter position




Annual fee for software and harwdware subscription?


Your Capto system is permanent licence so you can use with no limit. Annual software fee is for support and release updates Hardware fee is an extension of warranty for battery and eventual sensor's issue Those fee are not mandatory and you can do renewal if you like and when you like. No matter if you miss some months. The renewal gives you 365 days from order.




Does the bundle include 1 year of software / hardware subscription?


Yes, the Capto bundle include 1 year of software / hardware subscription




I cannot see Capto wi fi on Windows, what can I do?


If you cannot see Capto wi fi in wi fi list when the sensor is turned on, it means that your laptop works on 2.4 Ghz while the Capto sensor is setted at 5 Ghz. To downgrade the wi fi frequency, you can use onother device if you have. For example, connect Capto to Ipad and then go to settings and restore default wifi. If you do not have any other device, write to support@captogolf.com





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