TOF Distance Measurement Device Data Compression Module
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Solution Overview
Problem
Current time-of-flight (TOF) distance measurement devices face limitations in data capacity and processing efficiency due to the reliance on raw pixel data, which affects the depth measurement performance and requires significant storage and bandwidth resources.
Innovation Solution
The implementation of a device with a data compression module that utilizes multiple unit pixels with different modulation voltages to capture and compress pixel data, reducing the data capacity required for depth image generation by calculating phase differences and compressing differential data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If raw pixel data from multiple unit pixels is stored and processed, then depth measurement accuracy is maintained, but data capacity and storage requirements increase significantly
Solution Approach 1:
The patent extracts only the essential information (phase difference data) from the raw pixel data obtained from multiple unit pixels. By applying compression processing that calculates differential data between pixels and retains only the necessary phase information, the system removes redundant data while preserving depth measurement accuracy.
Solution Approach 2:
The patent transforms the data representation by changing parameters from raw pixel intensity values to compressed phase difference values. This parameter transformation reduces the data capacity requirements while maintaining the essential depth measurement information through mathematical operations on the pixel data.
2Loss of information
If raw pixel data is transmitted through serial interface, then complete depth information is available, but bandwidth consumption increases
Solution Approach 1:
The patent extracts only the necessary phase difference information from raw pixel data before transmission. By processing the data locally to obtain compressed representations that contain essential depth information, the system reduces the amount of data transmitted through the serial interface while maintaining measurement completeness.
3Measurement precision
If multiple unit pixels with different modulation voltages are used, then phase difference measurement capability is improved, but device complexity increases
Solution Approach 1:
The patent divides the pixel array into multiple unit pixels, each applying different modulation voltages with specific phase relationships. This segmentation allows simultaneous measurement of multiple phase points, improving phase difference measurement capability while managing complexity through structured organization of the pixel elements.
Solution Approach 2:
The patent makes each unit pixel multi-functional by enabling them to measure different phase points through applied modulation voltages. This universal approach allows the same hardware structure to perform multiple measurement functions, improving phase measurement capability without proportionally increasing overall device complexity.
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
This approach reduces the storage space needed for frame memory and saves bandwidth in serial interfaces while maintaining accurate depth measurement performance, enhancing the efficiency of TOF sensors.
Implementation Method 1
a photodiode 165, and a control circuit 122. The pixel array 130 may include a plurality of unit pixels 160, 170. Each unit pixel 160, 170 may include a photodiode 165
Data Source
AI summary
Provided herein is a distance measurement device. A device includes a first unit pixel to which a first modulation voltage having a designated phase and a second modulation voltage having a phase difference from the first modulation voltage are applied, a second unit pixel to which a third modulation voltage having a phase difference from the first modulation voltage and a fourth modulation voltage having a phase difference from the third modulation voltage are applied, and a data compression module configured to generate a compressed data set including data that is compressed compared to pixel data received from the first unit pixel and the second unit pixel based on the pixel data.