SPAD Depth Sensing TDC Calibration for Peak Bin Consistency

The patent applies parameter changes by adjusting the peak bin numbers of histograms from different SPAD pixels through calibration. Specifically, the system modifies the bin number parameters to ensure that all pixels within a unit pixel group produce consistent peak bin numbers, thereby resolving the inconsistency issue while maintaining depth measurement capability

The patent implements preliminary action by performing calibration of the time-to-digital converter (TDC) before actual depth measurement. The system pre-adjusts the peak bin numbers based on reference measurements, ensuring that consistency is established in advance, which prevents measurement errors from occurring during the actual depth capture process

The calibration process is performed as a preliminary action before actual depth measurement operations. By establishing the correct peak bin number alignment in advance, the system ensures that subsequent depth measurements can be performed quickly without repeated calibration, thus minimizing the time loss to a one-time setup cost

The system performs self-calibration by automatically adjusting the peak bin numbers based on reference measurements from the SPAD pixels themselves. The calibration process uses the pixels' own histogram data to determine and correct their peak bin numbers, eliminating the need for external calibration equipment or manual intervention, which reduces overall processing time