Camera System Synchronous Imaging with Shared Oscillator

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Solution Overview

Problem

Camera systems for advanced driving assistance and autonomous driving face a trade-off between wide view angles and high image resolution, where securing a wide view angle results in low resolution in certain regions, and increasing pixel density can decrease frame rate and sensitivity.

Innovation Solution

A camera system comprising a first and second imaging element with different lens specifications, a common oscillator for clock signal supply, and a controller for synchronous output of image data from both elements, reducing wiring complexity and enabling simultaneous image acquisition and analysis.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If a wide angle lens is used to secure a wide view angle, then the coverage area is improved, but the image resolution in certain regions deteriorates

Engineering Contradiction:
Improveview angle coverageVSAvoidimage resolution
Core Design Contradiction:
Area of stationary objectVSMeasurement precision

Solution Approach 1:

The patent divides the imaging function into multiple imaging elements (first imaging element with wide angle lens and second imaging element with telephoto lens). Each imaging element is responsible for capturing specific regions, allowing the system to simultaneously achieve wide coverage and high resolution without compromising either aspect.

Inventive Principle:
Principle #1Segmentation

2Measurement precision

If pixel density is increased to improve image resolution, then the measurement precision is improved, but the frame rate and sensitivity deteriorate

Engineering Contradiction:
Improveimage resolutionVSAvoidframe rate
Core Design Contradiction:
Measurement precisionVSProductivity

Solution Approach 1:

The patent segments the imaging task across multiple imaging elements with different resolutions and fields of view. The first imaging element captures wide-angle low-resolution images, while the second imaging element captures high-resolution images of specific regions. This segmentation allows the system to maintain high frame rates while providing high resolution where needed, avoiding the need to increase pixel density across the entire sensor array.

Inventive Principle:
Principle #1Segmentation

3Measurement precision

If multiple imaging elements are used to achieve both wide angle and high resolution, then the image quality is improved, but the wiring complexity increases

Engineering Contradiction:
Improveimage qualityVSAvoidwiring complexity
Core Design Contradiction:
Measurement precisionVSDevice complexity

Solution Approach 1:

The patent merges the clock signal generation function into a single oscillator that provides synchronized clock signals to both imaging elements. This consolidation reduces wiring complexity by eliminating the need for separate clock generators and their associated wiring, while still enabling both imaging elements to operate independently and capture high-quality images simultaneously.

Inventive Principle:
Principle #5Merging (Combining)

4Adaptability or versatility

If multiple oscillators are used for each imaging element to ensure independent operation, then the operational independence is improved, but the device complexity increases

Engineering Contradiction:
Improveoperational independenceVSAvoidoscillator quantity
Core Design Contradiction:
Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent implements a universal oscillator that serves multiple functions: it provides clock signals to both imaging elements, generates synchronization signals for coordinated operation, and enables both independent and synchronized imaging modes. This multi-functional approach maintains operational independence while reducing the number of oscillators from two to one, thereby reducing device complexity.

Inventive Principle:
Principle #6Universality (Multi-functionality)

Data Source

PatentUS10887512B2Camera system
Publication Date: 2021.01.05 DENSO CORP
  • US10887512B2 patent drawing
  • US10887512B2 patent drawing
  • US10887512B2 patent drawing

AI summary

A camera system includes: a first imaging element; a second imaging element different from the first imaging element; an oscillator for supplying a clock signal to the first imaging element and the second imaging element; and a controller that controls an operation of the first imaging element and an operation of the second imaging element, and acquires image signals outputted by the first imaging element and the second imaging element. The controller synchronizes and outputs image data of a first region, which is a part of an effective pixel region of the first imaging element, and image data of a second region, which is a part or a whole of an effective pixel region of the second imaging element.