Wireless Flash Synchronization via Retransmission
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Solution Overview
Problem
Existing image capturing and light emitting apparatus systems face synchronization issues due to failed information transmission and reception over wireless communication, leading to unsynchronized exposure and light emission timing, especially when communication intervals are predetermined.
Innovation Solution
An image capturing apparatus controls a light emitting apparatus by deciding and transmitting the remaining time for light emission based on exposure timing, with re-transmission of information in case of communication failures, ensuring synchronization through a wireless communication scheme at predetermined intervals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wireless communication is performed at predetermined intervals between image capturing apparatus and light emitting apparatus, then communication simplicity is improved, but synchronization reliability deteriorates when transmission or reception fails
Solution Approach 1:
The image capturing apparatus preliminarily determines the timing of wireless communication and light emission before actual execution. By calculating the remaining time until light emission based on predetermined communication intervals, the system prepares synchronization parameters in advance, allowing the light emitting apparatus to accurately time its emission even if communication fails at the last moment.
Solution Approach 2:
The light emitting apparatus feeds back reception confirmation information to the image capturing apparatus after receiving light emission information. This feedback mechanism allows the image capturing apparatus to verify whether communication succeeded, and if not, to determine appropriate retransmission timing based on the predetermined communication intervals, thereby maintaining synchronization reliability.
2Reliability
If re-transmission processing is performed when communication fails, then synchronization reliability is improved, but communication time overhead increases
Solution Approach 1:
The system performs wireless communication at predetermined periodic intervals rather than continuously. When communication fails, retransmission is scheduled at the next predetermined interval rather than immediately, reducing communication time overhead while maintaining synchronization reliability through regular periodic attempts.
3Measurement precision
If light emission information is transmitted at the last moment before exposure, then timing precision is improved, but communication failure risk increases
Solution Approach 1:
The system transmits light emission information at predetermined intervals before the actual exposure timing, rather than at the last moment. This preliminary transmission allows sufficient time for potential retransmissions while maintaining timing precision through calculated remaining time determination, reducing the risk of communication failure affecting synchronization.
Data Source
AI summary
An image capturing apparatus that controls a light emitting apparatus, performs communication with the light emitting apparatus at predetermined intervals, decides information regarding a period of time remaining before the light emitting apparatus emits light, based on the remaining time to exposure and a period of time from when the remaining time starts decreasing, to when the wireless communication unit performs a first wireless communication thereafter, and performs control so that the information regarding the decided period of time is transmitted to the light emitting apparatus through the first wireless communication with the light emitting apparatus. In a case where transmission and reception of the information regarding the period of time between the image capturing apparatus and the light emitting apparatus fail, the image capturing apparatus performs control so that the information regarding the period of time is re-transmitted.