Image Stabilization Control Apparatus with Calculation Overflow Prevention
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Solution Overview
Problem
Existing image stabilization technologies for cameras struggle to quickly remove noise components during still image capturing, leading to unstable image stabilization.
Innovation Solution
An image stabilization control apparatus with dual signal processing units, one with a high-pass filter having a large time constant for low-frequency noise removal during aiming and another with a small time constant for high-frequency noise removal during exposure, along with an overflow prevention mechanism to stabilize calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a single signal processing unit is used for image stabilization, then the device complexity is low, but the noise removal speed and image stabilization accuracy deteriorate during still image exposure
Solution Approach 1:
The patent divides the signal processing function into two separate signal processing units: a first signal processing unit that processes shake detection signals during aiming, and a second signal processing unit that processes signals during still image exposure. This segmentation allows each unit to be optimized for its specific operational phase, improving noise removal speed and image stabilization accuracy during exposure without unnecessarily complicating the overall system.
2Reliability
If a high-pass filter with a large time constant is used, then low-frequency noise removal is effective during aiming, but the noise removal speed deteriorates during still image exposure
Solution Approach 1:
The patent dynamically switches between different signal processing units based on the operational phase. During aiming, the first signal processing unit with a high-pass filter having a large time constant is used for effective low-frequency noise removal. During still image exposure, the system switches to the second signal processing unit with a high-pass filter having a small time constant, which provides faster noise removal speed. This dynamic adaptation resolves the contradiction between noise removal effectiveness and speed.
3Speed
If image stabilization control is continuously adjusted during aiming and exposure, then the image stabilization responsiveness is high, but calculation overflow occurs in the first signal processing unit
Solution Approach 1:
The patent extracts the image stabilization control function during still image exposure to a dedicated second signal processing unit. This unit independently processes shake detection signals and generates image stabilization control amounts during exposure, preventing calculation overflow in the first signal processing unit while maintaining high responsiveness. The separation of control functions between the two units resolves the contradiction between responsiveness and calculation stability.
Data Source
AI summary
An image stabilization control apparatus includes a signal processing unit, a control unit, and an overflow preventing unit. The signal processing unit controls image stabilization based on a second image stabilization target value in aiming at an object in preparation for still image exposure, and controls the image stabilization based on a first image stabilization target value during still image exposure. The overflow preventing unit prevents a calculation overflow of the first image stabilization target value while the control unit controls the image stabilization based on the second image stabilization target value.