OIS-DIS Camera Stabilization Using Vsync-Synchronized Motion Data
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Solution Overview
Problem
Existing image stabilization systems in portable devices face challenges in synchronizing optical and digital image stabilization due to the need for specialized image sensors capable of transferring image frames and motion data, limiting their application in various terminals.
Innovation Solution
An electronic device that transfers motion data synchronized based on a vertical synchronization signal corresponding to an image frame, enabling digital image stabilization by identifying motion data at specific points in time during the frame's read-out process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an image sensor capable of transferring image frame and motion data together is employed to synchronize optical and digital image stabilization, then image stabilization performance is improved, but device compatibility is reduced as it cannot be generally utilized for various portable terminals
Solution Approach 1:
The patent segments the data transfer process by separating image frame data and motion data into independent transfer channels. The image sensor transfers image frames through its native interface while motion data from external sensors is transferred separately and then synchronized in software using Vsync signals and timestamp correlation, eliminating the need for specialized integrated sensors.
Solution Approach 2:
The patent makes the image stabilization system universally compatible with various portable terminals by using standard image sensors without specialized integrated motion data capabilities. The system achieves synchronization functionality through a combination of standard components (image sensor, external motion sensors, processor) that can be found in diverse devices, rather than requiring a proprietary specialized sensor.
2Measurement precision
If motion data is continuously transferred from the image sensor to synchronize with image frames, then synchronization accuracy is improved, but data transfer complexity increases
Solution Approach 1:
The patent applies preliminary action by having the image sensor output Vsync signals that mark the start and end of frame readout periods in advance. These Vsync signals are used to pre-establish synchronization reference points, allowing the processor to later correlate motion data timestamps with the appropriate image frames without requiring continuous real-time data transfer or complex real-time synchronization protocols.
Data Source
AI summary
An electronic device according to an embodiment of the present disclosure may comprise: a camera module including an OIS actuator and an image sensor for performing read-out of an image frame acquired through image stabilization by the OIS actuator; at least one motion sensor; and at least one processor. The at least one processor may be configured to: acquire a first read-out image frame through the image sensor; acquire a first vertical synchronization signal (Vsync) corresponding to the first image frame from the image sensor; acquire multiple pieces of motion data of the electronic device through the at least one motion sensor during the read-out of the first image frame; determine (identify) first motion data corresponding to a first time point at which the read-out of the first image frame is completed, on the basis of the first vertical synchronization signal; and perform digital image stabilization (DIS) for the first image frame using the first motion data and at least one piece of second motion data acquired before the first motion data among the multiple pieces of motion data.