Panchromatic Channel Exposure Control for Motion Blur Reduction
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Solution Overview
Problem
Current electronic imaging systems face challenges in producing high-quality full-color images with reduced motion blur, especially under low-light conditions, due to limitations in light sensitivity and the need for additional hardware or complex image processing, which often result in increased noise or cost.
Innovation Solution
A method utilizing a color filter array with both color and panchromatic channels, where the panchromatic channel has a shorter exposure time than color channels, allowing for independent control of light accumulation, and employing pixel-binning schemes and interpolation techniques to generate an improved full-color output image with reduced motion blur without the need for a flash or costly stabilization systems.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the exposure time is lengthened to gather more light for correct exposure in dim scenes, then the light gathering capability is improved, but motion blur increases
Solution Approach 1:
The image sensor is segmented into color pixels and panchromatic pixels, where panchromatic pixels have higher light sensitivity. By differentiating pixel types and applying different exposure times to different channels, the system achieves both adequate light gathering and reduced motion blur in the final composite image.
Solution Approach 2:
The patent changes the exposure time parameter differently for color channels versus panchromatic channel. The panchromatic channel uses a shorter exposure time to reduce motion blur, while color channels use longer exposure times to gather sufficient light, and the results are combined through image processing.
2Manufacturing precision
If the exposure time is shortened to reduce motion blur, then the image sharpness is improved, but the image becomes under-exposed and noisy
Solution Approach 1:
The patent merges color channel images (with longer exposure and more light) and panchromatic channel images (with shorter exposure and less motion blur) into a single composite image. This combination allows the final image to have both adequate brightness and reduced motion blur.
3Illumination intensity
If high-grade optical elements with large apertures are used to gather more light, then the light gathering capability is improved, but the device complexity and cost increase
Solution Approach 1:
The patent replaces mechanical/optical solutions (larger apertures, better lenses) with an electronic/image processing solution. By using panchromatic pixels with broader spectral sensitivity and differential exposure timing, the system achieves improved light gathering without changing the physical optical components.
4Manufacturing precision
If a photographic flash is used to provide strong illumination for short exposure, then the image sharpness is improved, but the device cost and weight increase
Solution Approach 1:
The patent uses the existing light available in the scene and the inherent properties of panchromatic pixels (broader spectral sensitivity) to achieve short effective exposure without external illumination devices. The system serves itself by utilizing ambient light more efficiently through pixel-level spectral differentiation.
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 production of full-resolution color images with reduced blur and noise, without the requirement for additional buffer memory or complex hardware, effectively addressing motion blur in low-light conditions while maintaining image quality.
Implementation Method 1
a color filter array with both color and panchromatic channels, where the panchromatic channel has a shorter exposure time than color channels
Implementation Method 2
Each pixel is typically provided with either a red, green, or blue filter, as described by Bayer
Implementation Method 3
the pixel acts as a bucket in which photoelectrons are accumulated in direct proportion to amount of light that strikes the pixel during the capture of an image
Data Source
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AI summary
A method of forming a full-color output image using a color filter array image having a plurality of color channels and a panchromatic channel, comprising capturing a color filter array image having a plurality of color channels and a panchromatic channel, wherein the panchromatic channel is captured using a different exposure time than at least one of the color channels; computing an interpolated color image and an interpolated panchromatic image from the color filter array image; computing a transform relationship from the interpolated color image; and forming the full color output image using the interpolated panchromatic image and the functional relationship.