Ranging Device Exposure Period Shift for Higher Frame Rate
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Solution Overview
Problem
Existing ranging devices face challenges in improving frame rate due to the need for repeated light emission and reception while changing gating periods, leading to longer time requirements for distance measurement.
Innovation Solution
A ranging device and method that generate periodic first and second timings for light emission, shift the exposure period, and produce a frequency distribution indicating the relationship between light emission and reception time, allowing for shorter exposure period shifts and improved frame rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If repeatedly performing light emission and light reception while changing the gating period, then measurement accuracy is improved, but time required for one ranging increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing frequency distribution data for multiple gating periods before actual ranging measurement. The processor generates frequency distributions for different gating periods in advance, then uses this pre-computed data to quickly determine distance without performing repeated light emission and reception cycles during the actual measurement, thereby reducing the time required while maintaining measurement accuracy
Solution Approach 2:
The patent implements dynamics by adaptively selecting the gating period based on the measured distance. The processor determines the gating period dynamically according to the distance to the object, rather than using a fixed or predetermined gating period for all measurements. This dynamic adjustment allows the system to optimize the balance between measurement accuracy and time required, using shorter gating periods for closer objects and longer gating periods for farther objects
2Measurement precision
If repeatedly performing light emission and light reception while changing the gating period, then frequency distribution accuracy is improved, but frame rate improvement becomes difficult
Solution Approach 1:
The patent applies preliminary action by pre-generating frequency distribution data for multiple gating periods before actual ranging operations. The processor creates lookup tables or pre-computed frequency distributions that can be quickly referenced during frame operations, eliminating the need to perform repeated light emission and reception cycles for each frame while maintaining frequency distribution accuracy, thus improving frame rate
Solution Approach 2:
The patent implements partial action by performing light emission and reception only for the specific gating period needed for the current distance range, rather than repeatedly performing measurements for all possible gating periods. The system determines the appropriate gating period based on preliminary distance estimation and performs measurements only for that specific period, reducing the total number of operations required per frame and improving frame rate while maintaining accuracy
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 solution enables a higher frame rate by reducing the length of the exposure period shift range, thereby shortening the ranging frame period and enhancing the device's ability to measure distances efficiently.
Implementation Method 1
a light receiving unit configured to generate a signal based on incident light incident in an exposure period
Data Source
AI summary
A device including: a first generation unit generating first and second timings that are periodically repeated, and supplying the first and second timings to an emitting device as information indicating light emission timing; a receiving unit generating a signal based on incident light incident in an exposure period; a control unit performing control to shift the exposure period with reference to the first timing; and a second generation unit generating a frequency distribution indicating a relationship between time information from light emission to light reception and a frequency of light reception based on a signal generated in the receiving unit and information indicating a shift amount in the exposure period. A length of a shift range of the exposure period is shorter than a length of a period corresponding to a range.