Methods and system to quantify depth data accuracy in...

Details Methods and system to quantify depth data accuracy in... Methods and system to quantify depth data accuracy in...

2006-02-06

2008-08-05

Alsomiri, Isam (Department: 3662)

Optics: measuring and testing

Range or remote distance finding

With photodetection

C356S005100

Reexamination Certificate

active

07408627

ABSTRACT:
A method and system dynamically calculates confidence levels associated with accuracy of Z depth information obtained by a phase-shift time-of-flight (TOF) system that acquires consecutive images during an image frame. Knowledge of photodetector response to maximum and minimum detectable signals in active brightness and total brightness conditions is known a priori and stored. During system operation brightness threshold filtering and comparing with the a priori data permits identifying those photodetectors whose current output signals are of questionable confidence. A confidence map is dynamically generated and used to advise a user of the system that low confidence data is currently being generated. Parameter(s) other than brightness may also or instead be used.

REFERENCES:
patent: 6114985 (2000-09-01), Russell et al.
patent: 6580496 (2003-06-01), Bamji et al.
patent: 6833909 (2004-12-01), Schmidt et al.
patent: 2005/0088641 (2005-04-01), Hung et al.
patent: WO 2004017022 (2004-02-01), None

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