Video Frame Capture Timing Synchronization for Flicker Reduction
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Solution Overview
Problem
Digital video recording devices face flicker issues during playback due to mismatched frequencies between lighting sources and frame capture rates, especially when recording under alternating current lighting, which is not effectively addressed by existing methods that often lead to underutilization of device capabilities.
Innovation Solution
The method involves recording video frames unevenly in synchronization with the lighting flicker frequency, adjusting the time interval between frames to maintain constant light intensity, and utilizing a higher pixel rate frequency to ensure frames are captured at equivalent points in the light flickering cycle, allowing for full utilization of device capabilities without flicker during playback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the frame rate is altered to equal the lighting flicker rate divided by an integer, then flicker is reduced, but device capabilities are underutilized
Solution Approach 1:
The patent applies dynamics by making the frame capture timing variable rather than fixed. The system dynamically adjusts the time interval between frame captures based on the detected lighting flicker frequency, capturing frames at varying intervals that correspond to equivalent points in the light flicker cycle. This dynamic timing allows the device to operate at its full native frame rate capability while still eliminating flicker by ensuring each frame is captured at the same phase of the lighting cycle.
2Object-affected harmful factors
If the frame rate is reduced to eliminate flicker, then flicker perception is reduced, but recording speed decreases
Solution Approach 1:
The patent applies parameter changes by modifying the time interval parameter between frame captures rather than changing the overall frame rate. The system detects the lighting flicker frequency and adjusts the capture timing parameter to occur at equivalent points in the flicker cycle, while maintaining the device's native frame rate capability. This parameter adjustment eliminates flicker perception without reducing recording speed.
3Ease of operation
If a fixed frame rate is used, then device operation is simplified, but flicker occurs under mismatched lighting frequencies
Solution Approach 1:
The patent applies feedback by detecting the lighting flicker frequency and using this information to adjust the frame capture timing. The system continuously monitors the lighting conditions and modifies the capture intervals based on the detected flicker frequency, creating a feedback loop that adapts the recording parameters to match the environmental lighting conditions. This eliminates flicker while maintaining ease of operation through automatic adaptation.
4Ease of manufacture
If frames are captured at constant time intervals, then recording is straightforward, but beat effects occur between mismatched frequencies
Solution Approach 1:
The patent applies dynamics by transforming the constant time interval into a variable time interval that adapts to the lighting flicker frequency. Instead of using fixed intervals that cause beat effects, the system dynamically calculates and applies varying intervals that correspond to equivalent phases in the lighting cycle, thereby eliminating beat effects while maintaining recording process simplicity through automated adjustment.
Data Source
AI summary
Methods of reducing digital video flicker, and related systems, devices and computer program products are provided. A method of reducing human-perceivable flicker in a digital video is provided, in which video frames are recorded unevenly with respect to time and in synchronization with a lighting flicker frequency. A system including a camera and a computer is provided, the system configured to reduce human-perceivable flicker in a digital video, in which video frames are recorded unevenly with respect to time and in synchronization with a lighting flicker frequency, so as to reduce human-perceivable flicker in a video assembled using the computer from the video frames.