Adaptive Threshold Blur Correction for Fixed Point Capture
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Solution Overview
Problem
Conventional blur correction methods in image capture apparatuses incorrectly determine the panning state during camera shake, leading to residual shake in fixed point capturing scenarios, especially when the shake signal exceeds a predetermined threshold.
Innovation Solution
An image capture apparatus with a shake detection unit, motion vector detection unit, and control units that differentiate between panning and fixed point capturing states by adjusting thresholds and filter settings to optimize blur correction, thereby reducing residual shake in low-frequency ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a predetermined threshold is used to determine panning state, then panning control can be executed during panning operations, but residual shake occurs in fixed point capturing when shake signal exceeds the threshold
Solution Approach 1:
The patent applies dynamics by making the threshold adaptive rather than fixed. The determination unit dynamically adjusts the threshold for panning state determination based on the magnitude of the shake signal. When shake is large, the threshold is raised to prevent false panning detection; when shake is small, the threshold is lowered to enable proper panning detection. This dynamic threshold adjustment resolves the contradiction by allowing reliable panning detection while preventing residual shake in fixed point capturing.
Solution Approach 2:
The patent changes the parameter of the threshold value based on the shake signal characteristics. The determination unit modifies the threshold parameter dynamically according to the current shake magnitude, transforming a static threshold system into an adaptive one. This parameter change enables the system to distinguish between intentional panning and unintentional shake, thereby eliminating residual shake in fixed point capturing while maintaining accurate panning detection.
2Manufacturing precision
If blur correction is applied in high-frequency ranges during panning, then image quality improves, but low-frequency residual shake remains in fixed point capturing
Solution Approach 1:
The patent applies dynamics by dynamically switching the blur correction strategy based on the determined capturing state. When fixed point capturing is detected, the system applies blur correction in low-frequency ranges; when panning is detected, the system applies blur correction in high-frequency ranges. This dynamic adaptation of correction frequency ranges resolves the contradiction by optimizing image quality for panning while eliminating low-frequency residual shake in fixed point capturing.
Solution Approach 2:
The patent applies local quality by applying different blur correction characteristics to different frequency ranges based on the capturing state. For fixed point capturing, correction is applied to low-frequency components; for panning, correction is applied to high-frequency components. This localized approach to frequency-specific correction ensures optimal image quality for each capturing mode while eliminating the harmful residual shake effect.
Data Source
AI summary
An image capture apparatus comprises a shake detection unit which detects a shake of the image capture apparatus; a motion vector detection unit which detects a motion vector indicating a movement of an image; a first calculation unit which calculates a first shake correction amount; a second calculation unit which calculates a second shake correction amount; a shake correction unit which optically corrects a blur of a captured image; a panning determination unit which determines that the image capture apparatus performs a panning operation; a determination unit which determines whether or not the image capture apparatus is in a constant point capturing state; and a control change unit which changes the first threshold to a second threshold and amplifies the second shake correction amount when the determination unit determines the constant point capturing state.