Camera Shake Correction with Adaptive Zoom Thresholds
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Solution Overview
Problem
Conventional image extracting apparatuses struggle with effective camera shake correction, especially at high zoom magnifications, as the camera shake correction performance is substantially limited, making it difficult to prevent camera shake during photography.
Innovation Solution
An image extracting apparatus that determines whether the object scene image movement satisfies pan/tilt or camera-shake conditions using threshold values, with the threshold value increasing as zoom magnification rises, allowing for improved camera shake correction by activating appropriate determining means and moving the specific area within the imaging surface to cancel movements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If camera-shake correction is activated at high zoom magnification, then camera shake prevention performance is improved, but false activation due to pan/tilt operations increases
Solution Approach 1:
The patent applies dynamics by making the threshold value adaptive rather than fixed. The threshold for determining camera shake is dynamically adjusted based on zoom magnification level - higher thresholds are used at high zoom to accommodate normal pan/tilt movements, while lower thresholds are used at low zoom for sensitive detection. This dynamic adjustment resolves the contradiction by allowing reliable camera-shake correction at high zoom without false activation from pan/tilt operations.
Solution Approach 2:
The patent changes the parameter of threshold value based on zoom magnification. By modifying the threshold parameter according to the shooting condition (zoom level), the system achieves reliable camera-shake correction performance across different magnifications while preventing erroneous activation during pan/tilt operations at high zoom.
2Ease of operation
If a fixed threshold value is used for camera-shake detection, then determination simplicity is improved, but detection accuracy at varying zoom magnifications deteriorates
Solution Approach 1:
The system transitions from a static fixed threshold to a dynamic threshold that automatically adjusts based on zoom magnification. This maintains determination simplicity through automated adjustment while significantly improving detection accuracy across varying zoom levels by adapting the threshold to current shooting conditions.
Solution Approach 2:
The threshold parameter is changed according to zoom magnification level. The determination unit selects appropriate threshold values based on the current zoom state, ensuring accurate camera-shake detection regardless of magnification while keeping the operation simple through automated parameter selection.
3Object-affected harmful factors
If camera-shake correction is limited to prevent erroneous operation, then false correction is reduced, but correction effectiveness at high magnification is insufficient
Solution Approach 1:
The patent implements dynamic threshold adjustment based on zoom magnification, allowing the camera-shake correction system to operate effectively at high magnification without erroneous activation. The adaptive threshold enables the system to distinguish between normal pan/tilt movements and actual camera shake even at high zoom levels.
Solution Approach 2:
By changing the threshold parameter according to zoom magnification, the system achieves both reduced erroneous correction and maintained correction effectiveness. The determination unit uses zoom-dependent thresholds to accurately identify when correction is needed, resolving the contradiction between preventing false operation and ensuring effective correction.
Data Source
AI summary
A video camera includes an LCD monitor. On the LCD monitor, an object scene image belonging to a camera-shake correction area out of the object scene image captured by an imaging surface is displayed. A CPU determines whether or not a movement of the object scene image captured by the imaging surface satisfies a pan/tilt condition or a camera-shake condition referring to a threshold value. The threshold value is set to a large numerical value as a zoom magnification is high. A camera-shake condition determining process is started in place of a pan/tilt condition determining process when the pan/tilt condition is satisfied. Also, the pan/tilt condition determining process is started in place of the camera-shake condition determining process when the camera-shake condition is satisfied. In addition, the camera-shake correction area is moved in such a direction as to cancel the movement of the object scene image captured by the imaging surface when the pan/tilt condition is not satisfied.