Aperture Light Sensor for Video Camera Flickering and Actuator Wear
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing video camera systems experience flickering and wear on actuators due to frequent switching between night-mode and day-mode caused by inadequate assessment of ambient light, leading to suboptimal user experience and image quality.
Innovation Solution
A light sensor is integrated into the video camera's aperture plane to continuously probe light intensity, allowing for accurate determination of ambient light levels, thereby minimizing unnecessary mode switches and reducing wear on actuators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a light sensor probes light intensity continuously from the aperture plane, then measurement precision of ambient light is improved, but device complexity increases
Solution Approach 1:
A light sensor is introduced as an intermediary component in the aperture plane to measure ambient light intensity before light reaches the image sensor. This mediator provides accurate light level information to the control unit, enabling precise determination of when to switch between night-mode and day-mode without directly affecting the imaging function.
Solution Approach 2:
The aperture plane is utilized as a segmented space where the light sensor probes a specific portion to obtain light intensity information. By segmenting the light measurement function from the imaging function and placing it in the aperture plane, the system achieves accurate ambient light assessment while maintaining separate optimization of imaging and measurement functions.
2Adaptability or versatility
If the IR-cut filter is moved between covering and retracted positions, then adaptability to different lighting conditions is improved, but wear on the actuator increases due to frequent switching
Solution Approach 1:
The light sensor performs preliminary measurement of ambient light intensity before a mode switch is triggered. The control unit uses this advance information to determine whether switching between night-mode and day-mode is necessary, preventing unnecessary actuator movements and reducing wear while maintaining adaptability to lighting conditions.
Solution Approach 2:
A feedback mechanism is established where the light sensor continuously monitors ambient light levels and provides information to the control unit. The control unit compares the measured light intensity with threshold values and only triggers actuator movement when a mode change is genuinely needed, reducing frequent switching and actuator wear while maintaining system adaptability.
3Illumination intensity
If the IR-cut filter is retracted during night-mode operation, then illumination intensity for low-light imaging is improved, but color balance deteriorates due to IR-component distortion
Solution Approach 1:
The system dynamically adjusts the position of the IR-cut filter based on real-time ambient light conditions measured by the light sensor. During day-mode operation, the filter is inserted to block IR components and maintain color balance. During night-mode operation, the filter is retracted to allow maximum light sensitivity. This dynamic positioning resolves the contradiction between color accuracy and light sensitivity by adapting to operating conditions.
Solution Approach 2:
The system changes the optical parameters by moving the IR-cut filter between inserted and retracted positions based on ambient light intensity thresholds. When ambient light exceeds a threshold, the filter is inserted to achieve accurate color balance. When ambient light falls below the threshold, the filter is retracted to maximize illumination intensity for low-light imaging, thus resolving the contradiction through parameter adjustment.
4Adaptability or versatility
If the camera switches back to night-mode after inserting the IR-cut filter, then adaptability to actual light conditions is improved, but flickering occurs causing poor user experience
Solution Approach 1:
The light sensor provides continuous feedback on ambient light intensity to the control unit. The control unit uses this feedback to make informed decisions about mode switching, only triggering a switch to night-mode when the measured light intensity genuinely warrants it. This feedback mechanism prevents premature or erroneous switching that would cause flickering, while maintaining adaptability to actual lighting conditions.
Solution Approach 2:
Before switching modes, the control unit performs a preliminary assessment using light sensor data to determine whether a mode change is truly necessary. This preliminary action prevents unnecessary switching that would cause flickering, while still allowing the system to adapt to genuine changes in ambient light conditions, thus improving both stability and adaptability.
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
The solution enables precise assessment of ambient light, reducing flickering and wear on actuators, while allowing continuous recording and maintaining image quality by ensuring optimal mode operation.
Implementation Method 1
A light sensor is also provided, and the arrangement is characterized in that the light sensor is arranged to probe light intensity continuously from a portion of the beam path
Data Source
AI summary
An arrangement for determining an amount of light reaching an image sensor of a video camera is disclosed. The video camera comprises an imaging lens system guiding a beam path towards an image sensor and has an aperture plane where a variable aperture is arranged. The inventive arrangement comprises a light sensor arranged to probe light intensity continuously from a portion of the beam path, which portion is located in or near the aperture plane of the imaging lens system.