Tracing object trajectory through a photocamera

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Discussion Overview

The discussion centers around methods for tracing the trajectory of a moving object using photographic techniques. Participants explore various approaches, including light painting, video analysis, and motion detection algorithms, with a focus on capturing the shape of the trajectory rather than precise coordinates.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • One participant suggests using light painting principles and reflective paint to capture the trajectory of a yellow opaque object against a grey background.
  • Another proposes making a video and using tracing paper to mark the object's path, indicating a manual approach to trajectory tracing.
  • A different participant recommends keeping the camera shutter open and using a strobe light for multiple exposures to capture the trajectory.
  • There is a request for information on marking videos to adopt a motion detection algorithm for tracing the object's path.
  • One participant mentions finding online resources and tutorials that may assist in achieving the desired effect, specifically referencing a tutorial on light streaks.

Areas of Agreement / Disagreement

Participants present multiple competing views on how to trace the trajectory, with no consensus on a single method being preferred or established as the best approach.

Contextual Notes

Some methods depend on specific equipment or software, and the effectiveness of each approach may vary based on the conditions of the experiment, such as lighting and object visibility.

Who May Find This Useful

This discussion may be useful for photographers, videographers, and hobbyists interested in motion capture techniques and trajectory visualization in photography.

serbring
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Hi all,

I need to trace the trajectory of a moving object. The object are yellow and opaque while the background is grey. Since I'm interested in the shape rather than the exact coordinate, I'm wondering if I could use the light painting principle to impress on a photo the trajectory. How could I do it? By painting the object with any reflective paint? Any suggestion is welcome.

Thanks
 
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One way might be to make a video and put tracing paper over the screen. Play the vid and mark with a pencil.

There are probably some programs out there that will do motion detection for you and add a trail to the path of the moving object.
 
Keep the shutter open.
You could also use a strobe light for multiple exposures while the shutter is open.
 
@Tom G. great idea the stroboscope!

@CWatters: is there any way to mark a video? My desire is to adopt a motion detection algorithm
 

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