Vehicle Sensor Fusion Using Interpolated Frames for Time Alignment
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Solution Overview
Problem
The fusion of unsynchronized data frames from multiple sensors in vehicles, such as cameras, radars, and lidars, often results in errors when creating a three-dimensional model of the environment due to differences in frame capture times, leading to challenges in temporal synchronization.
Innovation Solution
A sensor data fusion system that synthesizes an interpolated-frame from a first-frame and a subsequent-frame of data from a first sensor, aligning it with the timestamp of a second-frame from a second sensor, using motion-flow-analysis or other image processing techniques to create a temporally synchronized data set for effective fusion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple sensors operate independently with different frame rates, then each sensor can capture data at its optimal rate, but the frames become temporally unsynchronized leading to errors in 3D modeling
Solution Approach 1:
The system performs preliminary actions by capturing multiple frames from the first sensor (first-frame and subsequent-frame) before the second sensor captures its frame. This allows the system to pre-process and interpolate data to match the timing of the second sensor's frame, ensuring temporal synchronization without requiring all sensors to operate at the same frame rate
Solution Approach 2:
The system creates a synthetic interpolated-frame that copies and reconstructs what the first sensor's data would have looked like at the exact timestamp of the second sensor's frame. This synthetic copy allows perfect temporal alignment between sensors with different frame rates, eliminating synchronization errors in 3D modeling
2Productivity
If frames from different sensors are fused without temporal synchronization, then data processing is simpler and faster, but the 3D model contains unacceptable errors
Solution Approach 1:
The interpolated-frame acts as an intermediary element between the first sensor's data and the second sensor's data. It mediates the temporal mismatch by providing a synthetic frame that bridges the time gap, allowing accurate fusion of data from sensors with different frame rates without requiring complex real-time synchronization mechanisms
3Measurement precision
If the system waits for all sensors to capture frames at the same timestamp, then temporal synchronization is perfect, but this reduces the overall data capture rate and increases processing delays
Solution Approach 1:
Instead of waiting for all sensors to capture frames at the same timestamp (which would reduce data capture rate), the system creates a synthetic copy of the first sensor's data interpolated to the second sensor's timestamp. This allows the system to maintain high data capture rates from all sensors while achieving perfect temporal synchronization through digital interpolation rather than physical coordination
Data Source
AI summary
A sensor data fusion system for a vehicle with multiple sensors includes a first-sensor, a second-sensor, and a controller-circuit. The first-sensor is configured to output a first-frame of data and a subsequent-frame of data indicative of objects present in a first-field-of-view. The first-frame is characterized by a first-time-stamp, the subsequent-frame of data characterized by a subsequent-time-stamp different from the first-time-stamp. The second-sensor is configured to output a second-frame of data indicative of objects present in a second-field-of-view that overlaps the first-field-of-view. The second-frame is characterized by a second-time-stamp temporally located between the first-time-stamp and the subsequent-time-stamp. The controller-circuit is configured to synthesize an interpolated-frame from the first-frame and the subsequent-frame. The interpolated-frame is characterized by an interpolated-time-stamp that corresponds to the second-time-stamp. The controller-circuit fuses the interpolated-frame with the second-frame to provide a fused-frame of data characterized by the interpolated-time-stamp, and operates the host-vehicle in accordance with the fused-frame.