Image Sensor Flicker Detection During Lens Drive
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Solution Overview
Problem
Existing image capture technologies face reduced flicker detection accuracy during live view display due to changes in exposure and focus conditions, which affect the detection of flicker frequency and uniformity in images captured under flickering light sources.
Innovation Solution
An image capture apparatus with a detection unit and control unit that adjusts lens drive operations to stabilize light intake during flicker detection, using methods such as restricting diaphragm speed and correcting photometric values to enhance detection accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If flicker detection is performed during live view display, then real-time flicker detection capability is improved, but detection accuracy deteriorates due to changes in exposure and focus conditions
Solution Approach 1:
The control unit preemptively detects lens drive operations that would cause changes in light amount and takes corrective action by adjusting the flicker detection method or timing before the detection is performed, thereby preventing detection accuracy degradation from occurring in the first place
Solution Approach 2:
The system dynamically adapts the flicker detection method based on real-time lens drive status. When lens drives are detected, the system switches to an alternative detection approach or adjusts timing parameters, making the detection system flexible and adaptive to changing conditions rather than using a fixed method
2Adaptability or versatility
If lens drive operations are performed during flicker detection, then exposure control flexibility is improved, but detection accuracy deteriorates due to changes in light amount
Solution Approach 1:
The system employs dynamic switching between different flicker detection methods based on lens drive status. When lens drives are detected, the system transitions to an alternative detection approach that is less sensitive to light amount changes, allowing both lens operation flexibility and detection accuracy to be maintained
Solution Approach 2:
The system changes detection parameters such as timing, integration period, or evaluation metrics based on detected lens drive operations. By adjusting these parameters dynamically, the system compensates for the impact of lens-driven light amount changes on detection accuracy
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively suppresses detection errors by stabilizing light intake, allowing for accurate flicker detection and uniform image exposure, even under conditions with changing light sources.
Implementation Method 1
an image sensor that captures a subject image formed via a lens and outputs an image
Data Source
AI summary
An image capture apparatus includes an image sensor that captures a subject image formed via a lens and outputs an image; and at least one processor or circuit configured to function as: a detection unit configured to detect flicker from the image output from the image sensor; and a control unit configured, in a case where, in an image capture time period in which images of a subject are being captured for flicker detection by the image sensor, the lens is driven in accordance with a drive operation that causes a change in an amount of light received by the image sensor, to adjust drive of the lens in the image capture time period.