Genlock Synchronization Control for Video Output Stability
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Solution Overview
Problem
Enabling the Genlock function during the playback mode in cameras often leads to unstable synchronization, resulting in image fluctuation or the output of a black image, making it difficult to achieve desired video output.
Innovation Solution
An information processing apparatus with a synchronization control unit that prevents the start of Genlock when an instruction is received while operating in playback mode, ensuring stable video output by switching to standby mode before enabling Genlock, thus avoiding image fluctuation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the Genlock function is enabled during playback mode, then synchronization control can be achieved, but image fluctuation occurs and video output becomes unstable
Solution Approach 1:
The patent applies preliminary action by determining the operation mode (playback or normal) before enabling Genlock. The synchronization control unit checks whether the camera is in playback mode prior to starting Genlock, and prevents Genlock activation during playback mode to avoid image fluctuation. This pre-check mechanism ensures that Genlock is only enabled when appropriate (in normal mode), thereby maintaining synchronization stability without compromising video output quality.
2Reliability
If a black image is outputted to prevent image fluctuation, then synchronization stability is improved, but desired video output cannot be achieved
Solution Approach 1:
The patent prevents the need to output black images by proactively determining the operation mode before Genlock activation. The synchronization control unit identifies playback mode in advance and blocks Genlock from starting, thereby maintaining both synchronization stability and continuous desired video output. This eliminates the information loss that would occur with black image output while preserving synchronization reliability.
3Adaptability or versatility
If Genlock is enabled in playback mode, then synchronization control is available, but image fluctuation and video stoppage occur
Solution Approach 1:
The patent applies dynamics by making Genlock activation conditional based on the current operation mode. The synchronization control unit dynamically adjusts Genlock behavior: allowing it to start in normal mode while preventing it from starting in playback mode. This dynamic control ensures that Genlock functionality is available when appropriate (normal mode) while maintaining video output stability, avoiding image fluctuation and stoppage that would occur with unconditional Genlock activation.
Data Source
AI summary
An information processing apparatus comprises: an output unit configured to perform video output to an external apparatus; a switching unit configured to switch an operation mode of the information processing apparatus between a first mode in which the video output by the output unit is performed and a second mode in which the video output by the output unit is not performed; and a synchronization control unit configured to, in the video output by the output unit, control whether or not to perform Genlock based on an external synchronization signal inputted from an external unit. The synchronization control unit, in a case where an instruction for performing Genlock has been received while operating in the first mode and not performing Genlock, prevents start of Genlock while operating in the first mode.