WRGB to RGB Color Filter Array Conversion Method
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Solution Overview
Problem
Existing image sensors with White-Red-Green-Blue (WRGB) color filter arrays face challenges in converting these arrays into Red-Green-Blue (RGB) arrays, particularly in maintaining color accuracy and reducing image blur near edges, as current methods often result in inferior signal-to-noise ratios and increased blur.
Innovation Solution
A method and device that corrects the colors of the WRGB color filter array by detecting correction points, converting the array into an RGB Bayer pattern using color correlation and edge direction maps, and updating the green values with adaptive weights, thereby improving color accuracy and reducing blur.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a WRGB color filter array is directly converted into an RGB color filter array using conventional methods, then the conversion process is simplified, but color accuracy deteriorates and image blur increases near edges
Solution Approach 1:
The patent applies preliminary action by performing color correction on the WRGB color filter array before converting it to an RGB color filter array. The color correction unit corrects colors in advance, and the green correction unit further refines green values using multichannel color difference values. This preliminary correction prevents color accuracy deterioration that would occur with direct conversion, while still maintaining a relatively simple conversion process.
2Device complexity
If conventional conversion methods are used to convert WRGB to RGB color filter arrays, then the device complexity is reduced, but image blur near edges increases and signal-to-noise ratio deteriorates
Solution Approach 1:
The patent implements feedback by using multichannel color difference values to correct green values in the color filter array. The green correction unit calculates color difference values from multiple channels and uses this feedback information to adjust and refine the green values, thereby improving signal-to-noise ratio and reducing image blur near edges while maintaining reasonable device complexity.
3Ease of manufacture
If the WRGB color filter array is converted to RGB Bayer pattern without green correction, then the manufacturing process is simpler, but green color accuracy and edge sharpness deteriorate
Solution Approach 1:
The patent applies parameter changes by modifying green values in the color filter array using multichannel color difference values. The green correction unit changes the green channel parameters based on calculated color differences, thereby improving green color accuracy and edge sharpness. This approach adds only a correction step to the manufacturing process without fundamentally complicating the overall manufacturing complexity.
Data Source
AI summary
Provided are a method and a device for converting a White-Red-Green-Blue (WRGB) color filter array into a Red-Green-Blue (RGB) color filter array in order to be easily applied to a commercial digital camera. The method includes (a) correcting a color of a White-Red-Green-Blue (WRGB) color filter array, (b) converting the WRGB color filter array into a Red-Green-Blue (RGB) color filter array, and (c) correcting a green of the RGB color filter array by using multichannel color difference value.