The RPTC system is easy to use and operate. It carries a camera around a plot table in the X and Y axes. The primary goal of the product is to enable users in wheelchairs to be able to take measurements on a plot table. Without being confined to a wheelchair, normal users can operate more ergonomically.


    The RPTC system uses pulleys and stepper motors to move the camera to any location within the frame. Slider bars within an included GUI on a workstation control these motors. An optional joystick/thumbstick accessory is sold separately. There is one motor for travel on the X-axis and another for travel on the Y-axis. 

    Image Processing

    The RPTC system does not only have the capability to capture and store images, but automatically take measurements of the desired distances between lines on the plots and the calibrated table. These images are processed into black and white images to find exact measurements. This is done entirely in the background, while the raw image is displayed with measurements superimposed on the raw image. The center of each point of intersection of the lines should be marked with a green star. The distances are displayed between the green stars. These measurements are in 1/1000″.

    Product Use

    The intended use of the RPTC system is to enable measurements to be taken at a workstation, rather than manually. This will reduce back strain and increase efficiency. The measurements are taken to verify printed plots to ensure that the printer is operating correctly. To use the RPTC system, simply open the provided software. It may ask for the USB port to be provided. Enter the USB port that the system is plugged in to. The GUI should appear and be fully functional. To capture an image and process it, press Capture Image. It will also take and display all of the measurements on screen. 

    This also opens employment opportunity to users that are unable to lean over the current plot table to take measurements. The entire task is now possible to finish at the workstation. The RPTC system can be used to quickly take measurements without the need to be zeroed on the specific point of measurement. Measurements can be calculated from an image that contains the entire red square on the calibrated plot table that contains the point to be measured. 

    Unique Features

    The RPTC system offers many unique features that other competing products do not. The RPTC system is built-to-order for each and every customer at an affordable cost. It is robust and has few moving parts to malfunction. It will work with left-handed or right-handed users. It will be usable by anyone not able to stand over the plot table. It is also usable by any users that are colorblind, deaf, or near-sighted. This also allows normal employees to not suffer from back tension or eye strain. If used correctly, the RPTC system can also increase productivity by lowering the time required to verify printed plots.

    Why Choose RPTC?

    Other than the RPTC system, high-end scanners are available to take measurements for print verification. Compared to the alternative products that are suitable for fulfilling the print verification, this product is only a fraction of the cost, and continues to utilize the calibrated back-lit plot tables that are already in use. The high-end scanner costs approximately 17 times as much as a single RPTC system.  

    Protocols and Standards

    Americans with Disabilities Act – The project was developed for residents at CPRF that are confined to a wheelchair.

    NFPA 70/NFPA 70E – The project adheres to the standards provided to ensure that the electrical components within the project are not a safety hazard.

    USB 2.0 – The project needed a method of communication to relay data for not only the control system, but the camera system. USB 2.0 streamlined the process because it was already well established in the components used in the project build.

    UL Listed – When applicable, parts used in the project build are preferred to be made to these safety specifications to ensure safety of the users.