This device is an open-source approach to scanning flat surfaces. The frame is simply placed on top of the surface to scan, and a computer vision software analyzes the picture to extract a rectified picture with real dimensions (pixels/unit).
<imgsrc="img/comparison.jpg"width=90%></img>
<imgsrc="img/comparison.jpg"width=70%></img>
This project is inspired by the [Shaper Trace](https://www.shapertools.com/en-us/trace), but offers an open source interface and lets users scan color images, not just vectors.
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The first step is to weed the vinyl in place:
<imgsrc="img/vinyl1.jpg"width=50%></img>
The result is then stuck onto transfer tape and laid flat:
<imgsrc="img/vinyl2.jpg"width=50%></img>
After joining to the frame, the transfer is peeled off, revealing the finished frame:
<imgsrc="img/vinyl3.jpg"width=50%></img>
### Inkjet printing
Alternatively, you can print the design of the frame using an inkjet printer, then glue it to a thin piece of cardboard:
<imgsrc="img/cardboard.jpg"width=50%></img>
The small frame is designed to be printable on an A4 page (or letter), and the medium frame fits on an A3 page.
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@@ -52,20 +52,20 @@ The small frame is designed to be printable on an A4 page (or letter), and the m
To quantify the accuracy of the scanning, a 25mm calibration grid was built:
<imgsrc="img/grid.jpg"width=70%></img>
Here is the image used for analysis, showing the detected features (aruco markers in blue, corners in red):
<imgsrc="img/features.jpg"width=70%></img>
Here is the extracted image:
<imgsrc="img/result.jpg"width=70%></img>
The grid feature points are automatically extracted:
<imgsrc="img/grid_features.jpg"width=70%></img>
Finally, the distance between neighboring grid points is measured, revealing the accuracy of the scanning process. Here is a comparison of all frames, including the Shaper Trace, showing improved accuracy and less variance:
