Espros on ToF Camera Calibration

Image Sensors World        Go to the original article...

Espros distributors Pacer (UK) and Aprizes (China) publish Espros application notes on ToF camera calibration. Almost everything affects the ToF measurements, some factors have quite a dramatic influence:

The main error sources which affect the accuracy of distance measurement are:
  • Distance response non-uniformity DRNU of the sensor
  • Temperature drift
  • Ambient light
  • The magnitude of the signal amplitude
Under the term DRNU, we treat all factors that lead to a different distance reading between any of the pixels in the pixel-field looking to the inside of a sphere. These factors are sensor/camera related and include:
  • Flat-field error of the pixel-field
  • Column A/D converter differences
  • Row addressing differences
  • Fixed-pattern noise caused by manufacturing tolerances
  • 4th order harmonics distortion of the demodulation algorithm

Another Espros presentation gives more info on ToF error sources:

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