Freeform Lens Imaging for Rearview and Backup in One Camera
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Solution Overview
Problem
Current vehicle imaging systems require separate cameras for rearview and backup functions, leading to high imager resolution and processor costs due to the need for a single system with 30-32 pixels per degree and a 130-180 degree field of view, which is not feasible with existing technology.
Innovation Solution
A dual-function imaging system utilizing a freeform optic lens with an inner region for high-resolution rearview and an outer region for backup, allowing for different effective magnification levels and reduced imager size, supported by an 8 megapixel image processor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single imager is used to provide both rearview and backup functions with high resolution (30-32 pixels per degree) and wide field of view (130-180 degrees), then the resolution and field of view requirements are met, but the imager size and processor cost become excessively large and costly
Solution Approach 1:
The lens is divided into two distinct regions: an inner region with higher magnification (30-32 pixels per degree) for rearview function, and an outer region with lower magnification (10-12 pixels per degree) for backup function. This segmentation allows each region to be optimized for its specific function, enabling the system to meet high resolution requirements for rearview while using a smaller overall imager size.
Solution Approach 2:
Different regions of the lens are assigned different optical properties - the inner region provides higher magnification and resolution for the rearview display, while the outer region provides lower magnification for the backup display. This local differentiation of optical quality allows the single imager to serve multiple functions with different resolution requirements, reducing the need for an excessively large sensor.
2Area of moving object
If a single imager is used to provide both rearview and backup functions with wide field of view (130-180 degrees), then the field of view requirement is met, but the processor size and cost increase significantly
Solution Approach 1:
The field of view is segmented into two functional zones handled by different lens regions. The inner region captures a narrower high-resolution view for rearview, while the outer region captures a wider lower-resolution view for backup. This segmentation reduces the total pixel count required compared to a single uniform high-resolution sensor, thereby reducing processor size and cost.
Solution Approach 2:
The magnification parameter varies across the lens surface - higher in the inner region and lower in the outer region. This parameter change allows the system to achieve different effective fields of view from a single sensor, optimizing the balance between field of view coverage and processing requirements for each function.
3Reliability
If separate imagers are used for rearview and backup functions, then each function can be optimized independently, but the system complexity and cost increase due to multiple components
Solution Approach 1:
Two separate imaging functions (rearview and backup) are merged into a single imager system with a divided lens. The inner region serves the rearview function while the outer region serves the backup function, combining what would traditionally require two separate cameras into one integrated system, thereby reducing overall system complexity.
Solution Approach 2:
A single imager is designed to perform multiple functions - serving as both a rearview camera and a backup camera. The lens's inner and outer regions provide different magnification levels that accommodate both functions, making the system universal and eliminating the need for separate dedicated imagers for each function.
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 efficient image processing and display for both rearview and backup functions within automotive applications, reducing costs and imager size while maintaining necessary resolution and field of view.
Implementation Method 1
a freeform optic lens with an inner region with a first magnification level and an outer region with a second magnification level
Data Source
AI summary
A dual-function imaging system may comprise an imager comprising a lens, the lens having an inner region and an outer region surrounding the inner region; an image processor in communication with the imager; a first video display element in communication with the image processor; and a second video display element in communication with the image processor. The lens may have a first effective magnification level in the inner region and a second effective magnification level in the outer region.