Image Blurring Correction via Exposure Timing Data Exchange
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Solution Overview
Problem
Interchangeable lens type camera systems face challenges in effectively controlling image blurring due to differences in gyro sensitivity between camera bodies and lens units, requiring angular velocity sensors with the same correction axes, which complicates blurring control and is difficult to adapt to various camera or lens specifications.
Innovation Solution
An image pickup system with a lens device and a camera body that communicate to control image blurring through a first and second communication unit, where the camera body transmits exposure period timing information to the lens device, allowing both units to calculate and split the degree of correction, enabling cooperative optical and electronic image blurring correction without recognizing individual lens or camera specifications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If blurring correction is performed based on blurring correction rates of camera body and lens unit, then blurring correction can be achieved, but it requires angular velocity sensors with the same correction axes and same gyro sensitivity, which reduces adaptability to various camera or lens specifications
Solution Approach 1:
The patent changes the control parameter from blurring correction rates (which require matched gyro sensitivity) to angle-based correction values. The camera body and lens device each calculate correction angles based on their own shake detection, then combine these angle values to achieve coordinated blurring correction. This parameter transformation allows different specifications to be accommodated while maintaining correction accuracy.
2Reliability
If lens device and camera body perform independent blurring correction, then correction effect can be enhanced, but communication traffic volume and communicating frequency must be great, which may cause processing to exceed prescribed time
Solution Approach 1:
The camera body performs preliminary action by calculating the exposure period timing in advance and transmitting this timing information to the lens device before the actual shooting. This allows the lens device to prepare its correction calculations in advance, reducing the communication and processing burden during the actual capture moment, thus ensuring both correction quality and timing requirements are met.
3Stability of the object's composition
If sampling timing is determined based on shutter speed information with vertical synchronization timing, then control can be synchronized, but sampling timing suitable for rolling shutter distortion correction is not uniquely determined, making it difficult to cope with various camera specifications
Solution Approach 1:
The patent implements a universal timing information transmission mechanism that works across different camera specifications. The camera body transmits exposure period timing information that encompasses both global shutter and rolling shutter scenarios. The lens device then adapts this universal timing information to its specific correction calculations, making the system universally compatible with various camera specifications while maintaining stable synchronization.
Data Source
AI summary
An image pickup system includes a camera body and a lens device that is attached to the camera body. In the lens device, a shake detecting unit detects a shake, and a splitting unit splits a degree of image blurring correction which is calculated on the basis of the shake into a degree of optical image blurring correction and a degree of electronic image blurring correction. In the first image blurring correction, driving of an image blurring correcting unit is controlled using the degree of optical image blurring correction. In the second image blurring correction, an electronic image blurring correction control unit of the camera body performs image blurring correction through image processing using the degree of electronic image blurring correction. The camera body transmits timing information on an exposure period and information on a correction range of the electronic image blurring correction to the lens device. The lens device transmits the degree of electronic image blurring correction calculated by the splitting unit to the camera body.