ToF Pulse Synchronization With Switchable Modulation Frequency
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Solution Overview
Problem
In distance image sensors using the indirect Time-of-Flight (ToF) camera system, the modulation frequency and distance measurement error have an inverse proportional relationship, limiting the accuracy of distance measurement as increasing modulation frequency narrows the measurement range.
Innovation Solution
A signal generation apparatus with a first pulse generator for the light source and a second pulse generator for pixels, featuring a switching section to adjust the modulation frequency within a predetermined period, allowing for flexible frequency settings while maintaining a simple configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the modulation frequency is increased to improve distance measurement accuracy, then the measurement range becomes narrower
Solution Approach 1:
The patent applies dynamics by making the modulation frequency adjustable rather than fixed. The signal generation apparatus can switch between different modulation frequencies (e.g., first modulation frequency for high accuracy, second modulation frequency for extended range) based on measurement requirements. This dynamic adjustment resolves the contradiction by allowing the system to optimize between accuracy and range depending on the specific application scenario.
Solution Approach 2:
The patent directly applies parameter changes by varying the modulation frequency parameter. The system includes a signal generation apparatus capable of generating signals at different modulation frequencies, allowing the operator to select appropriate frequency parameters to balance measurement accuracy and range requirements. This parameter variability enables the system to adapt to different measurement scenarios.
2Measurement precision
If the modulation frequency is increased to reduce distance measurement error, then the system complexity increases
Solution Approach 1:
The signal generation apparatus is designed with multi-functionality to generate multiple modulation frequencies using a single device. This universal capability allows the system to achieve high measurement accuracy without increasing overall system complexity, as one apparatus performs the function of multiple frequency generators. The switching section enables selection between different frequency modes without adding complex hardware.
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
Enables accurate distance measurement across various modulation frequencies, improving the range and accuracy of distance imaging without the limitations of traditional systems.
Implementation Method 1
a first pulse generator configured to generate a pulse to be supplied to a light source that irradiates light to a distance measurement target
Implementation Method 2
a second pulse generator configured to generate a pulse to be supplied to pixels that receive light reflected by the distance measurement target
Implementation Method 3
a switching section configured to switch a setting of a modulation frequency of the first pulse generator and the second pulse generator within a predetermined period
Data Source
AI summary
A signal generation apparatus for use with a ToF camera system includes a first pulse generator configured to generate a pulse to be supplied to a light source that irradiates light to a distance measurement target, a second pulse generator configured to generate a pulse to be supplied to pixels that receive light reflected by the distance measurement target, and a switching section configured to switch a setting of a modulation frequency of the first pulse generator and the second pulse generator within a predetermined period.