Smart exercise bicycles and other equipment include sensors that measure various parameters. The measurements are used to provide useful features such as visual speed feedback on a monitor while the user is in an online or prerecorded workout. However, smart bicycles are expensive. This disclosure describes low-cost techniques of estimating the rotations-per-minute (RPM), or equivalently the miles-per-hour (MPH), of an exercise bicycle using an available camera and displaying the measured parameters on a monitor. By utilizing an available camera, e.g., a smartphone or other device camera, and display, there is no need for specialized sensors/displays is eliminated. Thus, the user need not use an expensive smart bicycle to measure and view parameters related to their workout.
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Faaborg, Alexander James and Ishigaki, Michael, "Visual Determination of the Speed of an Exercise Bicycle", Technical Disclosure Commons, (May 03, 2021)