Stereo Camera System with Synchronized Rolling and Global Shutter Modes
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Solution Overview
Problem
Standard stereo camera systems struggle to produce depth images with high precision when cameras have different aperture angles and shutter modes, particularly in driver assistance systems where accurate distance determination is crucial for early risk recognition.
Innovation Solution
A stereo camera system comprising a rolling shutter camera and a global shutter camera with different aperture angles, synchronized to capture overlapping images, where the rolling shutter camera triggers the global shutter camera's exposure at specific pixels within the overlap area, allowing for precise distance determination and object recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If cameras with different aperture angles and shutter modes are used in a stereo camera system, then the field of view and detection range are improved, but the measurement precision of depth images deteriorates due to different exposure times
Solution Approach 1:
The patent changes the temporal parameter by synchronizing the exposure timing of cameras with different shutter modes. The rolling shutter camera's exposure timing is coordinated with the global shutter camera's exposure timing, ensuring that corresponding pixels capture light from the same moment in time, thereby maintaining depth measurement precision while allowing different aperture angles
Solution Approach 2:
The patent introduces a synchronization mechanism as an intermediary between the rolling shutter camera and global shutter camera. This synchronization system acts as a mediator that coordinates the exposure timing of both cameras, allowing them to work together effectively despite having different shutter modes and aperture angles
2Device complexity
If rolling shutter cameras are used with different aperture angles, then the device complexity is reduced, but the reliability of distance determination deteriorates due to synchronization difficulties
Solution Approach 1:
The patent applies preliminary action by pre-synchronizing the exposure timing before actual image capture begins. The rolling shutter camera's exposure timing is predetermined and coordinated with the global shutter camera's exposure timing in advance, ensuring that distance determination can proceed reliably without complex real-time synchronization adjustments
Data Source
AI summary
A stereo camera system for a driver assistance system includes a first camera having a first aperture angle and a second camera having a second aperture angle, wherein the first camera produces a wide-angle camera image, the second camera produces a telephoto camera image, and the two camera images have an area of overlap. The first camera is a rolling shutter camera and the second camera is a global shutter camera. The two cameras' shutters are synchronized with one another in particular manners.