Auto Focusing Lens Control via Vibration Detection
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Solution Overview
Problem
Traditional digital photographing apparatuses face challenges in achieving accurate and swift Auto Focusing (AF) operations, as they rely on generic AF algorithms that do not adapt to user behavior, leading to inefficiencies in focusing time and accuracy.
Innovation Solution
The apparatus employs a vibration detection sensor to measure vibration degrees, determining the optimal time for AF operations by calculating average differences and deviations in angular velocity, and selectively changes the AF algorithm by performing preliminary focus lens movements based on these measurements, allowing for precise direction determination and reduced focusing time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If a generic AF algorithm is used without vibration detection, then the device complexity is low, but the AF operation speed and accuracy are insufficient
Solution Approach 1:
The system performs preliminary vibration detection and analysis before the actual AF operation to determine the optimal AF timing and direction. By measuring vibration degrees in advance and calculating angular velocity patterns, the system prepares focus lens movement plans ahead of time, enabling faster and more accurate AF operations when triggered.
Solution Approach 2:
The system continuously monitors vibration degrees during the AF operation and adjusts the focus lens movement in real-time based on the measured vibrations. This feedback mechanism allows the system to adapt to changing conditions and achieve more accurate focusing by correcting for vibration-induced deviations.
2Measurement precision
If the focus lens moves in a predetermined range from initial to infinite position, then the AF algorithm is simple, but the focusing accuracy and speed are reduced
Solution Approach 1:
The system dynamically adjusts the focus lens movement path and range based on real-time vibration measurements and user behavior pattern recognition. Instead of following a fixed predetermined path, the lens movement is adapted to the actual shooting conditions, achieving more accurate focusing while maintaining algorithmic simplicity through automated adaptation.
3Measurement precision
If vibration detection and analysis is performed, then the AF operation accuracy is improved, but the processing time increases
Solution Approach 1:
The system performs vibration detection in periodic intervals rather than continuously, analyzing vibration degrees at specific moments when AF operation is anticipated. This periodic sampling reduces processing time while maintaining sufficient accuracy for determining optimal AF timing and direction.
Solution Approach 2:
The system changes the vibration detection parameters and analysis methods based on the detected vibration patterns. By adjusting detection sensitivity, sampling rates, and analysis algorithms dynamically, the system optimizes the balance between processing time and accuracy for each specific shooting condition.
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 enhances AF operation speed and accuracy by recognizing user behavior patterns through vibration analysis, reducing the focus lens movement distance and number of direction changes, thereby improving overall focusing performance.
Implementation Method 1
measuring vibration degrees of the digital photographing apparatus
Implementation Method 2
calculating average differences and deviations in angular velocity
Data Source
AI summary
A digital photographing apparatus for performing an Auto Focusing (AF) function and a method for controlling thereof, the method including: measuring vibration degrees of the digital photographing apparatus; determining based on the measured vibration degrees whether a time is right before an AF operation is performed; if the time is right before the AF operation is performed, performing a preceding AF operation of determining a moving direction of a focus lens by moving the focus lens; and if a first shutter release button is pressed, performing a subsequent AF operation of moving the focus lens in the determined moving direction. Accordingly, an AF operation time (from after a user pushes a shutter) may be reduced by decreasing a moving distance of a focus lens and the number of direction changes by recognizing a behavior pattern of the user through vibration transition measured by a vibration detection sensor.