Rotatable Optical Element Stepwise Control for Response Lag
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Solution Overview
Problem
In digital cameras, the increased processing load due to high pixel density causes time delays and slows down the response when a rotatable specific-effect optical element like a polarizing filter is rotated, making it difficult for photographers to determine the optimal rotational position in real-time.
Innovation Solution
The implementation of a controller that drives the rotatable optical element to rotate stepwise, stopping at specific angular positions, and obtains image data intermittently, reducing the processing load and allowing for visual indication on a display device, thereby improving operational responsiveness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If continuous image data acquisition is performed during rotation of the rotatable optical element, then real-time display update is achieved, but processing load increases and causes time delays
Solution Approach 1:
The controller performs image data acquisition intermittently at specific angular intervals (e.g., every 45 degrees) rather than continuously during rotation. This periodic sampling approach reduces the total number of images processed while still providing sufficient visual feedback for the photographer to determine the optimal rotational position, thereby reducing processing load and time delays.
2Loss of information
If image data is acquired at all rotational positions, then complete visual feedback is provided, but processing time increases and slows down photographing response
Solution Approach 1:
Instead of acquiring image data at all rotational positions, the system acquires data at a sufficient subset of positions (e.g., 4 positions at 45-degree intervals). This partial action provides adequate visual feedback for the photographer to make rotation adjustments without the excessive processing time required for complete coverage.
3Ease of operation
If the rotatable optical element rotates continuously, then smooth adjustment is achieved, but the photographer cannot determine the optimal position in real-time due to processing delays
Solution Approach 1:
The continuous rotation process is segmented into discrete angular steps with intermittent image acquisition at each step. The controller pauses or slows rotation at predetermined angular positions to capture images, allowing processing to complete without significant delay. This segmentation maintains ease of operation by providing clear visual feedback at each segment point.
Data Source
AI summary
An imaging device includes an imaging optical system including an image pickup device; a rotatable optical element which is positioned in the imaging optical system, and is rotated on a rotation axis extending in an optical axis direction to produce a specific photographic effect; and a controller which operates so that image data is obtained intermittently via the image pickup device at a plurality of angular steps of the rotatable optical element when the rotatable optical element is rotated on the rotation axis.