TIME-OF-FLIGHT RISING EDGE ADAPTIVE CROSS-TALK CORRECTION

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TIME-OF-FLIGHT RISING EDGE ADAPTIVE CROSS-TALK CORRECTION

This abstract first appeared for US patent application 18348600 titled 'TIME-OF-FLIGHT RISING EDGE ADAPTIVE CROSS-TALK CORRECTION

Original Abstract Submitted

A method of operating a time-of-flight (ToF) ranging system includes: receiving a histogram that includes a cross-talk signal generated by reflected light pulses from a cover glass of the ToF ranging system; finding, in a first region of the histogram, a first rising edge having a gradient that is larger than a threshold or is a maximum gradient in the first region, where the first rising edge is in a first histogram bin having a first value; determining a second value of a second histogram bin in the first region, where the first histogram bin precedes the second histogram bin by a pre-determined distance; estimating a ratio between the first region of the histogram and a pre-stored light pulse shape based on the first value and the second value; scaling the pre-stored light pulse shape with the estimated ratio; and subtracting the scaled pre-stored light pulse shape from the histogram.