Multi-camera HDR Capture via Simultaneous Exposure

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Solution Overview

Problem

Modern portable devices equipped with cameras struggle to capture high dynamic range images due to movement-induced blurring and require manual activation or scene analysis for dynamic range threshold checks, limiting their ability to capture HDR images effectively.

Innovation Solution

A method involving a main camera and auxiliary cameras that simultaneously capture frames by detecting the current dynamic range level and applying exposure compensation values to create a high dynamic range image without manual user intervention or scene threshold checks.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If multiple standard images are captured serially with different exposure times, then high dynamic range image can be created, but movement in the scene between frames causes blurring and renders images unable to be combined

Engineering Contradiction:
ImproveHDR image qualityVSAvoidImage alignment precision
Core Design Contradiction:
ReliabilityVSManufacturing precision

Solution Approach 1:

The patent applies preliminary action by simultaneously capturing multiple frames at different exposure times before movement occurs. The system prepares and executes multiple exposure captures in a single synchronized operation, ensuring all frames are captured at the same moment in time, thus eliminating movement-induced blurring and alignment issues that would occur with sequential capture methods.

Inventive Principle:
Principle #10Preliminary action

2Reliability

If existing HDR solutions are used, then HDR images may be captured, but manual activation of HDR option is required

Engineering Contradiction:
ImproveHDR capture capabilityVSAvoidUser operation simplicity
Core Design Contradiction:
ReliabilityVSEase of operation

Solution Approach 1:

The patent implements self-service by enabling the camera system to automatically detect scene dynamic range requirements and selectively activate HDR capture mode without user intervention. The system monitors scene characteristics in real-time and autonomously determines when HDR processing is necessary, eliminating the need for manual HDR option activation while maintaining capture reliability.

Inventive Principle:
Principle #25Self-service

3Reliability

If current HDR solutions are used, then HDR images may be captured, but scene analysis is required to determine whether dynamic range is above threshold

Engineering Contradiction:
ImproveHDR capture capabilityVSAvoidScene analysis complexity
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies self-service by implementing automatic scene analysis that continuously monitors dynamic range levels and autonomously decides when HDR capture is appropriate. The system performs real-time analysis of scene characteristics without requiring separate manual threshold checks, seamlessly integrating the decision-making process into the normal capture workflow and reducing operational complexity.

Inventive Principle:
Principle #25Self-service

4Manufacturing precision

If simultaneous capture by multiple cameras is implemented, then HDR image can be captured without movement blurring, but device complexity increases

Engineering Contradiction:
ImproveImage alignment precisionVSAvoidMulti-camera system complexity
Core Design Contradiction:
Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent applies segmentation by using multiple cameras positioned at different locations to capture simultaneous frames of the same scene. Each camera independently captures an exposure frame without being affected by scene movement, and the processed images are later combined to create the HDR result. This segmentation approach achieves precise alignment while distributing the complexity across separate camera units rather than requiring a single complex system.

Inventive Principle:
Principle #1Segmentation

Data Source

PatentUS10284761B2Multi-camera capture of a high dynamic range image
Publication Date: 2019.05.07 MOTOROLA MOBILITY LLC
  • US10284761B2 patent drawing
  • US10284761B2 patent drawing
  • US10284761B2 patent drawing

AI summary

A method, system, and computer program product for generating a high dynamic range (HDR) image from a plurality of frames simultaneously captured by cameras of a portable device. The method includes detecting, by a main camera of the portable device, a current dynamic range level of a current scene. In response to detecting the current dynamic range level, a main camera exposure compensation value is applied to the main camera and an auxiliary camera exposure compensation value, which is different from the main camera exposure compensation value, is applied to at least one auxiliary camera. The method further includes simultaneously capturing a first frame by the main camera and at least one second frame by at least one auxiliary camera. The method further includes combining the first frame and the at least one second frame to create the HDR image.