Camera Image Stabilizer Fallback Control for Communication Delays
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Solution Overview
Problem
Existing image stabilization systems in camera systems face communication delays that lead to incomplete image stabilization within a predetermined time, resulting in image blur due to unsmooth communication between the lens unit and the camera body, and inability to determine when to switch between new and previous data for stabilization control.
Innovation Solution
The camera system includes a camera communicator and a camera controller that enables communication with the lens apparatus, setting second image stabilization information for use when first information is not received, allowing the camera image stabilizer to perform stabilization operations using either the first or second information based on availability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the camera body transmits exposure time information to the lens unit and the lens unit transmits image stabilization data back, then cooperative image stabilization control is achieved, but communication delay causes the image stabilization process to be incomplete within the predetermined time period
Solution Approach 1:
The camera body performs preliminary actions by transmitting exposure time information and other control data to the lens unit before the image stabilization process is needed. This allows the lens unit to prepare its response data in advance, reducing the actual communication delay when the stabilization data is needed during the exposure period.
Solution Approach 2:
The system maintains continuous communication and data transmission between the camera body and lens unit throughout the image capture process. The camera body continuously transmits control information (exposure time, aperture, etc.) and the lens unit continuously provides image stabilization data, ensuring that the stabilization process is ongoing and complete within the predetermined time period without interruption or delay.
2Loss of information
If the lens unit transmits image stabilization data to the camera body, then electronic image stabilization can be performed, but the camera body cannot determine when the response will be transmitted making it difficult to switch between data sources
Solution Approach 1:
The lens unit implements a feedback mechanism by transmitting not only image stabilization data but also timing information indicating when the data was generated or will be transmitted. The camera body uses this feedback to synchronize its processing and determine the appropriate timing for switching between different data sources (lens unit data vs. camera body motion vectors) without adding complex switching control logic.
Data Source
AI summary
The image-capturing apparatus includes a camera controller performing communication with a lens apparatus, and a camera image stabilizer performing, using image stabilization information, an image stabilization operation. The camera controller sets, before receiving from the lens apparatus first image stabilization information produced by the lens apparatus depending on a shake of the lens apparatus, second image stabilization information usable for the image stabilization operation, causes the camera image stabilizer, when receiving the first image stabilization information, to perform the image stabilization operation using the first image stabilization information, and causes the camera image stabilizer, when not receiving the first image stabilization information, to perform the image stabilization operation using the second image stabilization information.