Camera Auto-Focusing via Time-Varying Focal Length Adjustment
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Solution Overview
Problem
Conventional camera devices face challenges in capturing clear images due to defocusing issues when switching between day and night modes, leading to incomplete monitoring observations as the existing focusing processes are time-consuming and disrupt image capture.
Innovation Solution
An auto-focusing method that actively varies the focal length of the camera device's lens based on time variations by dividing the capturing period into intervals, generating sampling values, computing estimation values, and adjusting the focal length accordingly to maintain clear image capture throughout changing light conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the conventional focusing process is executed to acquire clear monitoring image, then the image clarity is improved, but the executive time increases and monitoring observation is interrupted
Solution Approach 1:
The system performs preliminary focusing actions by dividing the capturing period into time intervals and pre-computing estimation values for each interval. The operation processor generates sampling values and computes estimation values in advance, so when capture is needed, the focal length can be quickly adjusted without time-consuming real-time focusing processes
Solution Approach 2:
The patent implements dynamic focusing by actively varying the focal length of the lens according to time variation. The operation processor adjusts the focal length dynamically based on the current time interval and pre-computed estimation values, allowing the system to adapt to changing lighting conditions (day/night modes) without manual intervention or lengthy focusing processes
2Use of energy by moving object
If the infrared optical filter is removed to increase photosensitivity in night mode, then the photosensitivity is improved, but the monitoring image becomes defocused
Solution Approach 1:
The system changes the focal length parameter dynamically based on time intervals and lighting conditions. When switching from day mode to night mode (infrared filter removal), the operation processor computes estimation values and adjusts the focal length parameter accordingly, ensuring the lens is properly focused for infrared imaging while maintaining high photosensitivity
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 reduces the time required for focusing and ensures continuous clear image capture, enhancing monitoring comprehensiveness and adaptability to varying environmental illumination, such as during seasonal changes, by automatically adjusting the focal length according to estimation values or curves.
Implementation Method 1
actively varying a focal length of a lens of a camera device according to time variation
Implementation Method 2
Imaging position of the image sensor is effected by refraction of the infrared optical filter
Implementation Method 3
the image sensor can capture the clear monitoring image through the infrared optical filter
Data Source
AI summary
An auto-focusing method capable of varying focal length of a lens of an camera device according to time variation is applied to the camera device with the lens. The auto-focusing method includes dividing a capturing period of the camera device into a plurality of time intervals, generating a plurality of sampling values within each time interval by several focusing process, utilizing the plurality of sampling values to calculate an estimation value relative to the each time interval, and driving the camera device to adjust the focal length of the lens of an camera device in accordance with capturing time of the camera device and the estimation values of the plurality of time intervals.