depth-quality

Depth Quality Tool

Overview

This application allows you to test the camera’s depth quality, including: Z-Accuracy, Sub-Pixel and Z RMS errors (spatial noise) and Fill Rate. You should be able to easily get and interpret several of the depth quality metrics, or record and save the data for offline analysis.

Quick Start

• Position the depth camera within a range of 0.3 - 2 meter from a flat non-reflective surface.
• Aim the camera to the target and hold it steady for several seconds till the tool is able to recognize the surface (the yellow grid in 3D view).
• Adjust the camera using the "Angle" metric to minimize the skew and make it as perpendicular to the surface as possible.
• Inspect the calculated depth quality metrics, expand the metric properties to get more in-depth info.

Features

• 2D/3D Depth View
• Plane Fitting - using reconstructed surface
• User-defined Region of Interest
• Depth Quality metrics:
  • Z-Accuracy
  • Spatial Noise:
    • Plane Fit RMS Error
    • Sub-Pixel RMS Error
  • Fill-Rate
  • Distance to target
• Export metrics and device configuration
• Depth Sensor controls

Metrics elaborated

Plane Fit RMS Error

Dist_i - Distance from pixel coordinates to the Plane Fit (mm)

Sub-Pixel RMS Error

Z_i - Depth value of i-th pixel in the ROI (mm)
ZP_i - Depth value of the i-th pixel projected onto the plane fit (mm)
BL - Stereoscopic Baseline (mm)
FL -Focal Length as a multiple of pixel width (pixels)
D_i - Disparity value of i-th pixel in the ROI (pixel)
DP_i - Disparity value of i-th plane-projected pixel (pixel)

Z Accuracy

RotationPivot_x,y,z - Intersection point between the Camera's optical axis (principal point) and the Fitted Plane
PlanesOffset_mm - Distance (signed) from the Fitted to the Ground Truth planes (mm)
D_i - Distance (signed) from pixel coordinates to the Fitted Plane (mm)
D'_i - Distance from the rotated D_i coordinate to the Ground Truth Plane (mm)
GT - Ground Truth distance to the wall (mm)