Camera capable of detecting elongated objects
I am considering purchasing a D415 and would like to know if it is capable of detecting curved objects 4mm in diameter.
Or I would like to know what camera is capable of detecting it.
The object with a diameter of 4 mm is 1000 mm long, and ideally it should all fit within the imaging range.
Thank you.
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Hi Konyaa I ran tests on a few curved objects that were approximately 4 mm wide and 1 meter (1000 mm) long and made of different materials, using various RealSense camera models (D405, D415, D435F, D455 and L515).
A 1000 mm long object can fit within the RGB color and depth-measuring views of all of these models. Whilst the RGB image is excellent, RealSense cameras have difficulty with depth-measuring objects this thin.
The success of the test results for the depth image were dependent on the kind of material that the object is made from, with semi-transparent objects not being detected at all and plain white ones only being partially detected instead of showing the entire 1000 mm length. Plain black objects would also not be detected. Out of all the camera models tested, D435F performed best, though still only showed a partial depth image.
So in conclusion, if you will be detecting the cable from the RGB image then any RealSense model should meet your needs. If you are detecting from the depth image though and require the entire length of the object to be captured then the chances of success are lower.
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Thanks for your quick response and testing.
If we limit the imaging area, would detection be possible?
The object is stationary black and will be used as a still image.
Therefore, we expect to take multiple images and merge them together. -
In regard to limiting the detection area, yes, the rendering of depth information for the object improves considerably if the camera is moved in closer to focus on a smaller section instead of the entire 1000 mm length. In the case of a black object though, it still will not have depth information, unless a strong light source is cast on the object (if it is not reflective) in order to help bring out depth detail from its surface.
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