Calibration review step
Calibration has always been a little mysterious in Velogic Studio. What do the points mean? How do you know if you took them in the right place?
Velogic Studio v4 now has a new step in the Calibration and Measurement wizards to show you the results of the Calibration step, so you can quickly see if you’ve completed the calibration correctly or not.
After you’ve taken the 5 calibration points, you’ll see a new Calibration Review step:
This can look quite bizarre at first glance, but you will quickly become familiar with it and how to use it.
If you click anywhere on the main 3D image and move your mouse (while holding the mouse button down), you’ll see that you can drag the 3D image viewpoint around:
You can also use the mousewheel to zoom, and the right mouse button to drag the camera position.
What you are looking at is a 3D “snapshot” of the bike in your studio, with a visualisation of how Velogic Studio is using those points to establish the relationship between the camera and the bike. Let’s dig in!
The bike plane
The first 3 points taken during calibration form a triangle, and the triangle is used to establish the “plane” of the bike. This is represented as a blue square in the visualisation, and you should see that the blue square sits in line with the frame of the bike as you drag left/right:
If the blue square is on an angle, or doesn’t seem to line up nicely with the bike, you should go back and redo the calibration.
The pitch points
The last 2 points taken during calibration form a line or bar, which is used to establish the “pitch” of the bike, relative to the camera.
If the bar doesn’t look like it connects the 2 pitch points you took during calibration, you should go back and redo the calibration.
Ideal vs Actual cameras
When you first move onto this step of the wizard, the virtual 3D camera will be positioned as if at the front of the bike, looking along the bike. This is to allow you to quickly see if the bike plane looks correct.
You can click on different predefined camera viewpoints by using the links on the right-hand side of the screen:
If you click on “Actual camera” and then “Ideal Driveside camera” (or “Ideal Non-Driveside camera”, depending on which side your camera is on), you will see a slight change in the viewpoint:
The “ideal” camera position has been calculated by Velogic Studio, using the calibration points. The “ideal” camera should be:
- directly facing the bike plane (to adjust for yaw or roll of the bike, relative to the camera)
- rotated so that the pitch bar (between the two pitch points) is level from the camera’s point of view.
This is really the heart of what the calibration system is doing; it’s adjusting for any misalignment of the camera with respect to the bike, so that measurements are as accurate as possible.
To further illustrate this, if you click on the “Actual camera” link and then use the mousewheel to zoom out slightly, you will see a virtual representation of both the Actual camera and the Ideal camera in the 3D scene:
If the actual camera was perfectly positioned relative to the bike, the actual and ideal camera would overlay each other.
Checking calibration numerically
On the right-hand side of this step, you can see some numeric values which quantify the relationship between the camera and the bike:
With practice, you will be able to tell whether these numbers match your expectations. If your camera was perfectly flat and level to the ground, and perfectly at right-angles to the bike, and the bike was perfectly upright on the ground and perfectly level - then these numbers would all be 0.
Note that it’s OK for the numbers not to be zero; calibration establishes what those numbers are, so that the measurement process can adjust for them mathematically.
After reviewing calibration
Once you are happy with the calibration points, you can click “Finish” to finish the calibration, or click “Next” to continue (if you were calibrating before measuring).
Related Articles
Calibration
Calibration is a process which accurately defines the location and orientation of the fit bike relative to the camera, so that measurements taken during the fit are as accurate as possible. The 5 points that are captured allow us to correct for ...Release Notes - Velogic Studio (Insider)
These are the release notes for the Insider version of Velogic Studio. See also: Release notes for the main (non-insider) version v4.0.2464 on 2024-05-02 Measurement and Calibration wizards now work better on all screen sizes, particularly smaller ...Release notes - Velogic Studio
This section summarises bugs and features released to Velogic Studio users. See also: Release notes for Insider version Note that new releases of Velogic Studio are automatically delivered to your computer. You can check the version number on the ...The bike fit process
Step 1: Configuration and rider details After starting Velogic Studio (and optionally signing in, if you haven’t signed in recently), you'll see Step 1: Step 1 is for you to get all setup prior to the fit session commencing. The client name, email ...Reviewing and comparing fit artifacts
As you carry out the fit, Velogic Studio records various "artifacts" for each capture. These include: Raw videos from the depth camera(s) and/or any webcams you have at different positions around the rider. Stroke analysis videos from the depth ...