Video Recording Apparatus Wobbling Lens Focus Control
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Solution Overview
Problem
Video recording apparatuses face challenges in focusing on objects when using a rolling shutter while the focus lens and image sensor are wobbling, as existing methods degrade the performance of Depth from Defocus (DFD) techniques by failing to effectively adjust imaging timings and blur differences.
Innovation Solution
A video recording apparatus with a control unit that adjusts imaging timings and calculates distance information using image signals from a focus lens and image sensor, which wobble to increase blur differences, allowing for accurate focus determination and DFD performance maintenance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If imaging is performed using a rolling shutter while the focus lens and image sensor are wobbling, then the DFD performance degrades due to inadequate adjustment of imaging timings and blur differences, but if imaging timings are adjusted according to the wobbling motion, then accurate focus control can be achieved
Solution Approach 1:
The control unit pre-calculates and determines the imaging timings based on the planned wobbling motion of the focus lens and image sensor. By determining the timing information in advance according to the wobbling characteristics, the system ensures that images are captured at optimal moments to maximize blur differences while maintaining synchronized control, thereby resolving the contradiction between measurement precision and device complexity.
Solution Approach 2:
The system dynamically adjusts imaging timings based on the actual wobbling motion of the focus lens and image sensor. Rather than using fixed timing, the control unit continuously adapts the capture timing to match the dynamic positions during wobbling, ensuring optimal blur difference capture. This dynamic approach maintains focus control accuracy while managing the complexity through adaptive rather than static control mechanisms.
2Measurement precision
If the focus lens and image sensor are wobbled to periodically change the distance between them, then blur differences increase for better DFD, but the imaging timing must be precisely coordinated to maintain image quality
Solution Approach 1:
The control unit monitors the wobbling motion of the focus lens and image sensor and uses this feedback information to adjust imaging timings in real-time. By continuously tracking the actual positions during wobbling and coordinating capture timing accordingly, the system maximizes blur differences while maintaining image quality consistency. The feedback mechanism ensures that timing adjustments are precisely coordinated with the physical motion states.
Solution Approach 2:
The wobbling motion of the focus lens and image sensor is maintained continuously throughout the imaging process, with imaging timings coordinated to capture images at multiple phases of the wobbling cycle. This continuous useful action ensures that blur differences are consistently generated and captured, maintaining both measurement precision and image quality reliability through uninterrupted optical path utilization.
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 apparatus maintains accurate DFD performance by adjusting imaging timings based on the wobbling motion of the focus lens and image sensor, enhancing focus control and blur difference management, thereby ensuring precise focus and image quality.
Implementation Method 1
at least one of a focus lens and an image sensor is wobbling to periodically change the distance between the focus lens and the image sensor
Implementation Method 2
an optical system including a focus lens; an image sensor that generates an image signal based on an image obtained through the optical system
Data Source
AI summary
Provided is a video recording apparatus that can generate image signals to increase a difference in amount of blur in recording video using a rolling shutter during wobbling, and includes: an image sensor that generates an image signal corresponding to an image; a driving unit that drives a focus lens along an optical axis; and a control unit that controls the driving unit for controlling a focus in an optical system, while the focus lens is wobbling, wherein the control unit (i) generates blur signals to increase a difference in amount of blur in a predetermined region by controlling imaging timings at which the image sensor captures the image, (ii) calculates distance information on a distance to the object to be displayed in the region, using blur signals in the region among the generated blur signals, and (iii) controls the focus using the distance information.