Using the railway network as a flatbed scanner

Capturing an image using the railway network as a flatbed scanner involves pointing a camera out of a moving vehicle and capturing a series of vertical lines. As the camera moves, what it sees changes, but by quickly capturing these lines and stitching them together, a complete-looking image can be produced. In the 1990s, digital camera sensor technology did not match the resolution of medium and large format film, leading to the development of digital scanning backs that capture high-resolution images using a single line of pixels moving across the frame.

Although modern image sensors are larger, this approach remains cheaper for large formats. The author was inspired to create their own digital scanning back for a large format camera after watching a video on building a medium format scanning camera. However, the project proved to be more challenging than anticipated, particularly in accounting for speed variations during motion.

The author attempted to scan a sofa using a smartphone on an office chair, but the results were unsatisfactory due to inconsistent speed. To improve the outcome, the author tried scanning a train using an MBTA orange line while utilizing the phone's accelerometer and a high frame rate to capture the motion. Although the initial results were intriguing, they required more lines for a clearer image.

The author discovered the Basler ruL2048-19gm camera, which boasts an impressive sensor capable of reading out data at an impressive 19,000 times per second, albeit at a price point that is still relatively affordable.