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Need information related to accuracy of ReaslSense cameras

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6 comments

  • MartyG

    Hi Aswaths  The error factor of different RealSense camera models can be compared in a chart at the link below.  For the D415 and any model with 'D435' in its name, the official depth measurement error rating (listed in the Depth Accuracy row of the chart) is less than 2% at 2 meters distance from the observed object / surface.  

    https://www.intelrealsense.com/compare-depth-cameras/

     

    You should be able to get closer to 1% error rate as the camera is positioned nearer than 2 meters away.

     

    For your particular application, the D405 model may suit.  It is a compact size and is designed to provide high accuracy, high quality images at close range (ideal depth range 7 cm to 50 cm, though it can depth-sense further) and so it is excellent for body and skin scanning.

     

    I captured a test image (below) of my body with a D405 held from the body at 1 meter distance.

     

     

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  • Aswaths

    Hi MartyG. Our working distance range is between 70cm to 120cm, So D435 model seems to be good for us. If the error percentage is 1% at this range (120cm) it comes around 1cm, which is far greater than our error range (i.,e 1mm). Is there any calibration method or something else which can help us achieve this accuracy with D435 models? 

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  • MartyG

    The D405 is officially described as providing sub-millimeter accuracy.

    https://www.intelrealsense.com/depth-camera-d405/

     

    D405 is not equipped with a built-in laser projector though.

     

    The D435 has a built-in laser projector component that casts an invisible pattern of infrared dots onto surfaces in the real-world scene and the camera uses this pattern to aid in analyzing those surfaces for depth information.  So you could maximize the Laser Power setting to its top value of '360' (its default value is 150) to ensure that the dot pattern is as bright as it can be, since the visibility of the dot pattern to the camera increases as Laser Power is increased.

     

    The D435f model is equipped with light-absorbing filters on its sensors to enhance depth quality.

    https://www.intelrealsense.com/depth-camera-d435f/

     

    RealSense cameras have a calibration tool called Tare that can calibrate depth measurement accuracy.

     

    You can also minimize potentially disruptive elements in the location that the camera is used in, such as surface reflections, ceiling strip-lights and surfaces with a repeating pattern, such as floor or ceiling tiles.  

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  • Aswaths

    Our object is a circle with 1cm diameter placed at a distance of 70cm 10 120cm. The product description of D405 says it has submillimeter accuracy of 0.1mm at 7cm. Do you have any graph which compares actual distance vs measured distance at this operating range? 

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  • MartyG

    There is not a chart available, though I performed RMS Error (error over distance) analysis with a D405 on a flat wall with the Depth Quality Tool at approximately 70 cm distance (the tool could not provide an RMS value further away than 70 cm).  The RMS results were around 1% error when using the Medium Density camera configuration preset and 0.5% error when using the High Accuracy preset.

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  • Aswaths

    Thanks for the calculation MartyG. Will discuss with our team and get back to you regarding purchases if it is suitable.

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