Aperture Control Hold Value for Stable Iris Positioning

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Solution Overview

Problem

Existing auto iris control systems in imaging and video capture contexts, such as video surveillance, are inherently unstable, only maintaining stability in fully open or fully closed conditions, which limits the quality of images and video captured.

Innovation Solution

The implementation of a system that determines an aperture control hold value to maintain the aperture opening at a current position, rejects invalid luminance changes, and adjusts aperture control values based on measured and target frame luminance, using a mechanical system with aperture blades, a coil, magnet, and spring to control the aperture opening, ensuring stable aperture control.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If automatic iris control is implemented to adjust aperture dynamically, then adaptability to varying light conditions is improved, but system stability deteriorates because the system is inherently unstable except in fully open or fully closed conditions

Engineering Contradiction:

Improveadaptability to varying light conditionsVSAvoidsystem stability

Core Design Contradiction:

Adaptability or versatilityVSStability of the object's composition

Solution Approach 1:

The patent implements a feedback control system that continuously monitors the current aperture position and compares it with the target position, then adjusts the aperture control value accordingly. The controller receives feedback about the aperture state and dynamically adjusts the control signal to maintain stability during intermediate positions, resolving the contradiction between dynamic adaptability and system stability.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent introduces dynamic control parameters including aperture control hold values that are adjusted based on current operating conditions. The system transitions from static aperture control (only stable at extremes) to dynamic control where parameters are continuously adapted, enabling stable operation at intermediate aperture positions while maintaining adaptability to varying light conditions.

Inventive Principle:

Principle #15Dynamics

2Manufacturing precision

If aperture control values are adjusted frequently to maintain target luminance, then image quality is improved, but system response time and control complexity increase

Engineering Contradiction:

Improveimage qualityVSAvoidcontrol response time

Core Design Contradiction:

Manufacturing precisionVSLoss of time

Solution Approach 1:

The patent implements a threshold-based control mechanism where aperture adjustments are only made when luminance deviations exceed predetermined thresholds. This partial action approach prevents unnecessary frequent adjustments, reducing control response time and system activity while maintaining sufficient image quality by correcting only significant luminance errors.

Inventive Principle:

Principle #16Partial or excessive action

Solution Approach 2:

The system performs preliminary calculations to determine optimal aperture control values based on target luminance requirements before actual adjustments are made. By pre-computing control parameters and preparing adjustment strategies in advance, the system reduces actual response time when adjustments are needed, balancing image quality requirements with response time constraints.

Inventive Principle:

Principle #10Preliminary action

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

This approach provides enhanced auto iris control, allowing for high-quality image and video capture by maintaining the aperture at a stable position between fully open and fully closed, improving image quality and adaptability to varying light conditions.

Implementation Method 1

using a mechanical system with aperture blades, a coil, magnet, and spring to control the aperture opening

Methodology Applied

Scientific EffectElectromagnetic force: Lorentz Force

Implementation Method 2

using a mechanical system with aperture blades, a coil, magnet, and spring to control the aperture opening

Methodology Applied

Scientific EffectElastic force: Spring

Data Source

PatentUS10324357B2Automatic lens aperture control for image and video capture

Publication Date: 2019.06.18 INTEL CORP

AI summary

Techniques related to automatic aperture control for an imaging device are discussed. Such techniques may include implementing an aperture control value to adjust an aperture opening, measuring a rate of change in measured luminance at an image sensor in response to the aperture control value, and determining an aperture control hold value to hold the aperture opening at a current position using the aperture control value and the rate of change.