Random Optical Filter Array with Scattering Unit for High-Resolution Imaging
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Solution Overview
Problem
Conventional color imaging devices equipped with a single image sensor face challenges in capturing high-resolution color images due to limited information acquisition, leading to potential resolution decline and artifacts like false colors during demosaicing.
Innovation Solution
An image generation device employing a random optical filter array with a scattering unit, comprising materials of different refractive indices, which diffuses light across multiple photodiodes, allowing each pixel to receive sufficient information from various wavelength regions, thereby suppressing resolution decline and enabling high-resolution image generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single image sensor is used to reduce size and cost, then device complexity is reduced, but measurement precision of color information deteriorates
Solution Approach 1:
The patent segments the color filtering function across multiple photodiodes by introducing a scattering unit. Instead of each pixel capturing only one color, the scattering unit distributes light from multiple wavelength regions to each photodiode, enabling single-pixel capture of multi-color information through spatial segmentation of the optical path.
Solution Approach 2:
The scattering unit acts as an intermediary between the optical filters and photodiodes. It mediates the light transmission by scattering light that has passed through the random optical filter array, allowing each photodiode to receive light from multiple wavelength regions and thereby improving color information capture without adding multiple sensors.
2Loss of information
If demosaicing processing is applied to acquire R, G, and B information for each pixel, then color information completeness is improved, but image resolution deteriorates due to artifacts
Solution Approach 1:
The patent performs preliminary action by capturing complete color information at each pixel location before image reconstruction. The scattering unit and random optical filter array are configured in advance to ensure that each photodiode receives light from multiple wavelength regions, eliminating the need for demosaicing interpolation and preventing resolution loss.
Solution Approach 2:
The patent changes the optical parameters by introducing a scattering unit with specific refractive index properties. This alters the light propagation path, enabling each photodiode to receive light from multiple wavelength regions. The scattering unit's refractive index difference creates the necessary light distribution pattern to capture full color information at each pixel.
3Measurement precision
If a random optical filter array with scattering unit is introduced to capture multiple wavelength regions per pixel, then measurement precision of color information is improved, but device complexity increases
Solution Approach 1:
The scattering unit serves multiple functions simultaneously: it scatters light to distribute multiple wavelength regions to each photodiode, works with the random optical filter array to enable compressed sensing, and maintains compatibility with standard photodiode structures. This multi-functionality reduces the need for additional specialized components.
Solution Approach 2:
The random optical filter array and scattering unit work together in a self-service manner where the scattering unit naturally distributes light based on its refractive index properties, and the random filter array inherently provides the compression mapping. This self-organizing system reduces the need for complex external control mechanisms.
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 generates high-resolution color images by diffusing light across pixels, enhancing information acquisition and reducing artifacts, thus improving image quality compared to conventional methods.
Implementation Method 1
a scattering unit, which includes a material having a first refractive index and a material having a second refractive index that is different from the first refractive index
Data Source
AI summary
An imaging system serving as an image generation device is provided with: a random optical filter array that has a plurality of types of optical filters and a scattering unit; photodiodes that receive light transmitted through the random optical filter array; an AD conversion unit that converts the light received by the photodiodes, into digital data; and a color image generation circuit that generates an image, using the digital data and modulation information of the random optical filter array, in which the scattering unit is located between the plurality of types of optical filters and the photodiodes, and in which the scattering unit includes a material having a first refractive index, and a material having a second refractive index that is different from the first refractive index.