Gaze Tracking Calibration Arrangement for Temperature Compensation
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Solution Overview
Problem
Gaze tracking systems using LEDs face challenges due to temperature-induced variances, leading to reduced light output, wavelength shifts, and latency issues, which deteriorate the accuracy of gaze direction determination.
Innovation Solution
A calibration arrangement that includes a light emitter and a light receiver, along with a controller, to emit and measure light pulses at different intensities, calculating a difference in intensities to calibrate the light intensity reading and compensate for temperature-induced variances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If LED is used for gaze tracking, then energy efficiency and longevity are improved, but temperature-induced variances cause deterioration in light output consistency and measurement precision
Solution Approach 1:
The system changes the operational parameters by emitting light in pulsed intervals rather than continuous operation. The controller emits light pulses at specific time intervals, allowing the LED to cool between pulses and maintain consistent light output characteristics, thereby resolving the temperature-induced precision degradation while preserving energy efficiency
Solution Approach 2:
The patent implements periodic light emission through pulsed operation. The controller periodically activates the LED at defined intervals, creating a rhythmic on-off pattern that prevents thermal accumulation and maintains stable light intensity readings throughout prolonged usage periods
2Duration of action of moving object
If LED operates for prolonged period, then gaze tracking duration is extended, but temperature increase causes light output reduction and wavelength shift
Solution Approach 1:
The system employs periodic pulsed operation where the LED is activated in repeated cycles with defined on-duration and off-intervals. This periodic action extends the operational duration by preventing thermal runaway while maintaining consistent light output intensity and wavelength characteristics throughout extended gaze tracking sessions
Solution Approach 2:
The controller pre-defines pulse timing and duration parameters before operation begins. By establishing the pulse waveform characteristics in advance, the system proactively prevents temperature-induced drift before it occurs, ensuring light output consistency is maintained throughout the extended operational period
3Measurement precision
If continuous light emission is used, then gaze tracking accuracy is maintained, but energy consumption increases and temperature rises
Solution Approach 1:
The patent replaces continuous light emission with periodic pulsed emission. The controller activates the LED in discrete pulses at optimized intervals, dramatically reducing overall energy consumption while the precisely timed pulses provide sufficient light intensity for accurate gaze tracking measurements during active measurement windows
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The calibration arrangement enables accurate determination of gaze direction by compensating for temperature-induced changes, improving the consistency, accuracy, and reliability of gaze tracking systems.
Implementation Method 1
a light receiver to receive at least part of the emitted light and generate an output signal, wherein the generated output signal is a function of an intensity of the received light
Data Source
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AI summary
An aim of the present disclosure is to provide a calibration arrangement (100, 302, 402) to calibrate a light intensity reading (IM). The calibration arrangement (100, 302, 402) comprises a first light emitter (102, 318, 406) to emit light, a first light receiver (112, 320, 416) to receive the emitted light and generate an output signal and a controller (116, 342) to provide a first control signal (118) to the first light emitter (102, 318, 406) to emit a first light pulse (106, 206) during a first period of time (t0-t1), measure a first output signal, provide a second control signal to the first light emitter (102, 318, 406) to emit a second light pulse (210) during a second period of time (t2-t3), measure a second output signal, calculate a second difference (I1-I2) between the first output signal and the second output signal and use the calculated second difference (I1-I2) to calibrate the light intensity reading (IM).