Electrochromic Filter for Sub-Pixel Image Resolution
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Solution Overview
Problem
Current image capturing devices face challenges in achieving high resolution images due to limitations in filtering technologies, particularly in accurately determining sub-pixel information which is crucial for edge detection and image quality enhancement.
Innovation Solution
The use of an electrochromic filter with spatial and temporal variation of transparency, controlled by electrodes, is positioned in front of an image sensor to filter light and capture images at predetermined times, allowing for the determination of sub-pixel information by comparing images with and without the filter, thereby enhancing image resolution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a filter with spatial variation of transparency is used to determine sub-pixel information, then image resolution is improved, but device complexity increases
Solution Approach 1:
The patent applies parameter changes by using a filter whose transparency varies spatially and temporally according to controlled parameters. The filter transitions between different transparency states (e.g., clear to opaque) in response to electrical signals, enabling sub-pixel information to be encoded through variations in light transmission rather than physical pixel structure. This allows a single image sensor to achieve super-resolution by manipulating the temporal-spatial parameters of the filter.
Solution Approach 2:
The patent replaces traditional mechanical or fixed optical filtering systems with an electronically controllable electrochromic filter. Instead of using multiple physical filters or complex optical components to achieve different filtering states, the system uses an electronic control mechanism to dynamically adjust the filter's transparency. This substitution reduces mechanical complexity while enabling more flexible and precise control over the filtering process, thereby improving image resolution without proportionally increasing device complexity.
2Measurement precision
If electrochromic glass is used to control light filtration, then sub-pixel information can be determined, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies the self-service principle by utilizing the inherent properties of electrochromic glass to achieve the desired filtering function. The electrochromic material automatically transitions between transparent and opaque states in response to applied voltage, without requiring external mechanical actuators or complex control mechanisms. This self-responsive behavior simplifies the overall system design and reduces manufacturing precision requirements, as the filter's state changes are determined by electrical parameters rather than mechanical positioning or alignment.
Solution Approach 2:
The patent uses parameter changes by controlling the electrical voltage applied to the electrochromic glass to achieve specific transparency states. Instead of requiring precise mechanical manufacturing tolerances, the system adjusts the electrical parameters (voltage magnitude and duration) to control the filter's transparency. This electrical parameter control approach is more forgiving of manufacturing variations and allows for flexible adjustment of sub-pixel information encoding without stringent manufacturing precision requirements.
3Measurement precision
If multiple images are captured at different times with the filter in different configurations, then sub-pixel information is determined, but loss of time increases
Solution Approach 1:
The patent applies periodic action by capturing multiple images at different time points while the filter transitions through predetermined transparency states. The filter is cycled through a sequence of states (e.g., clear → opaque → clear) and images are captured at specific moments during these transitions. This periodic cycling allows the system to encode sub-pixel information across multiple images without requiring the filter to remain in a single state for extended periods, thereby managing the time loss through structured temporal sampling.
Solution Approach 2:
The patent uses preliminary action by pre-determining the transparency states the filter will assume during the imaging sequence. The filter is controlled to transition through a planned sequence of states before and during image capture, allowing the system to anticipate and prepare for the required filtering configurations. This preliminary planning of filter states enables efficient timing of image captures at optimal moments during transitions, reducing the total time required compared to uncoordinated sequential imaging.
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
This approach enables the capture of high-resolution images by determining sub-pixel information, improving edge detection and overall image quality through precise control of light filtration, and can be calibrated to account for environmental factors and filter imperfections.
Implementation Method 1
The at least one filter may comprise electrochromic glass and activating the at least one filter may comprise providing a potential difference across the electrochromic glass.
Data Source
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AI summary
Examples of the disclosure relate to apparatus, methods and computer programs for enabling sub-pixel information to be determined in captured images. The apparatus can comprise means for activating at least one filter wherein the at least one filter is positioned in front of at least one image sensor. The at least one filter is configured to at least partially filter light such that the at least one filter has a spatial variation of transparency on an analogue scale across an area covered by the at least one filter. The apparatus also comprises means for detecting an image captured by the at least one image sensor; and using information relating to the spatial variation of transparency of the at least one filter to determine sub-pixel information in the captured image.