What a beautiful example of image processing. Great post
jeffbee · 16m ago
Okay I was stumped about how this works because it's not explained, as far as I can tell. But I guess the sensor array has its long axis perpendicular to the direction the train is traveling.
eschneider · 22s ago
You use a single vertical line of sensors and resample "continuously". When doing this with film, the aperture is a vertical slit and you continuously advance the film during the exposure.
For "finish line" cameras, the slit is located at the finish line and you start pulling film when the horses approach. Since the exposure is continuous, you never miss the exact moment of the finish.
miladyincontrol · 7m ago
Line scan sensors are basically just scanners, heck people make em out of scanners .
Usually the issue is they need rather still subjects, but in this case rather than the sensor doing a scanning sweep they're just capturing the subject as it moves by, keeping the background pixels static.
dllu · 6m ago
Thanks, I added a section called "Principle of operation" to explain how it works.
For "finish line" cameras, the slit is located at the finish line and you start pulling film when the horses approach. Since the exposure is continuous, you never miss the exact moment of the finish.
Usually the issue is they need rather still subjects, but in this case rather than the sensor doing a scanning sweep they're just capturing the subject as it moves by, keeping the background pixels static.