Abstract:
A calibration standard for an image processing system as an optical measuring device is described, which ensures high accuracy and the correct determination of brightness and/or tristimulus values for two-dimensional measurements. According to the invention, the calibration standard comprises at least four dimensional circles (4.1; 4.2; 4.3; 4.4) on a dimensionally stable planar surface (1).
Abstract:
Disclosed is a method for correcting the temperature sensitivity of the amount of light L emitted by a light emitting diode (LED) and measured in a light detector, said LED being operated in a pulsed mode with an essentially constant pulse duration tP. According to the inventive method, a predetermined parameter X that has a predetermined ratio to the temperature T of the LED is used while a corrective factor K is determined from said parameter X, preferably using a calibration table, most preferably a closed, predetermined function, with the aid of which the measured emitted amount of light L is corrected by the temperature-dependent variations of the emitted amount of light. The parameter X is determined from at least two output signals of the LED which are correlated in a predetermined manner.
Abstract:
Optical sensing systems having improved vibration cancelation, and methods of achieving improved vibration cancelation. In one example, an optical sensing system (200) includes an optical sensor (210) configured to produce an unprocessed sensor output signal (215) representative of a response of the optical sensor to at least an optical signature of interest and a local vibration excitation, a reference sensor (220) configured to provide a reference signal responsive (225) to the local vibration excitation, and a controller (260), including an adaptive digital filter (230), coupled to the optical sensor and to the reference sensor, and configured to receive the reference signal and to adjust one or more coefficients of the adaptive digital filter to minimize coherence between a residual signal (255) and the reference signal, the residual signal being a difference between the sensor output signal and a filter output signal (235) from the adaptive digital filter.
Abstract:
A dynamic signal to noise ratio tracking system (10) enables detection and tracking of ride vehicles (26), (170, 360) within the field of view of the tracking system (10). The tracking system (10) may include an emitter configured to emit electromagnetic radiation within an area (30), a detector (16) configured to detect electromagnetic radiation reflected back from within the area (30), and a control unit (18) configured to evaluate signals from the detector (16) and control the ride vehicles (26, 170, 360) or other equipment (12) as a result of this evaluation.