RAW Image White Balance Correction and Synthesis
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Solution Overview
Problem
Existing image synthesis techniques fail to accurately maintain correct white balance when combining multiple RAW image data captured under different light sources, often requiring duplicate processing steps that can lead to incorrect results.
Innovation Solution
An image processing apparatus and method that performs white balance correction on RAW image data and synthesizes multiple images, ensuring correct white balance by setting and applying white balance gains, and optionally performing color matrix calculations to achieve accurate color reproduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If white balance correction is performed on each RAW image data separately before synthesis, then correct white balance is maintained in the synthesized image, but processing complexity increases due to duplicate processing steps
Solution Approach 1:
The patent applies preliminary action by performing white balance correction on each RAW image data before synthesis. The white balance setting unit determines appropriate white balance parameters in advance, and the white balance correction unit applies these corrections to each image data individually before the synthesis process, ensuring correct white balance is established prior to combining images from different light sources
Solution Approach 2:
The patent utilizes parameter changes by adjusting white balance parameters (such as gain values for different color channels) based on the specific lighting conditions of each captured image. The system changes these parameters dynamically for each image data according to its illumination characteristics, allowing accurate color representation across multiple images with different light sources
2Productivity
If multiple images from different light sources are synthesized without individual white balance correction, then processing is simpler, but color accuracy deteriorates in the synthesized image
Solution Approach 1:
The patent applies preliminary action by performing white balance correction on each RAW image data before synthesis. The white balance setting unit determines appropriate white balance parameters in advance, and the white balance correction unit applies these corrections to each image data individually before the synthesis process, ensuring correct white balance is established prior to combining images from different light sources
Solution Approach 2:
The patent utilizes parameter changes by adjusting white balance parameters (such as gain values for different color channels) based on the specific lighting conditions of each captured image. The system changes these parameters dynamically for each image data according to its illumination characteristics, allowing accurate color representation across multiple images with different light sources
Data Source
AI summary
An image processing apparatus comprises a white balance setting unit that performs a setting of white balance correction processing on an image data, a white balance correction unit that performs white balance correction processing corresponding to the setting by the white balance setting unit on each of a plurality of RAW image data obtained in a photography operation, and an image synthesizing unit that generates synthesized image data by synthesizing a plurality of image data subjected to the white balance correction processing.