Image Fusion Across SDR and HDR Color Standards
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Solution Overview
Problem
Images under different color display standards, such as SDR and HDR, cannot be effectively superposed and fused due to differences in color space and brightness range, leading to abnormal color and brightness in the fused image.
Innovation Solution
Convert pixel colors of foreground and background images from their respective color spaces into optical signals under a common color display standard, apply a conversion coefficient based on the peak brightness of the target display device, fuse these signals based on light transmittance, and then convert back to the common color space to obtain a fused image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If images under different color display standards are directly superposed and fused, then the processing is simple and fast, but the color and brightness of the fused image become abnormal
Solution Approach 1:
The patent converts image parameters from different color display standards (SDR bt.709 and HDR bt.2020) to a unified color space through mathematical transformation. This involves changing the brightness range parameter from SDR's 0-100 nit to HDR's 0-10000 nit, and adjusting color space parameters to achieve accurate color representation in the fused image while maintaining processing efficiency
Solution Approach 2:
The patent introduces an intermediate processing step where images are converted to a common color space representation before fusion. This intermediary transformation layer acts as a bridge between SDR and HDR standards, allowing images from different standards to be properly combined without direct conflict, thereby preserving both processing speed and color accuracy
2Productivity
If images under different color display standards are directly superposed and fused, then the processing is simple and fast, but the brightness range becomes inconsistent
Solution Approach 1:
The patent transforms the brightness parameter from SDR's limited 0-100 nit range to HDR's extended 0-10000 nit range through a conversion formula. This parameter change ensures that brightness values from both SDR and HDR images are properly scaled and represented in the unified HDR color space, achieving consistent brightness in the fused image without sacrificing processing speed
Data Source
AI summary
An image processing method and related apparatuses are provided. The method includes: converting colors of pixels of a foreground image into optical signals under a second color display standard to obtain a first optical signal set; converting the optical signals in the first optical signal set according to the conversion coefficient to obtain a second optical signal set; converting colors of pixels of the background image into optical signals under the second color display standard to obtain a third optical signal set; fusing optical signals in the second optical signal set and the third optical signal set based on a light transmittance of the foreground image to obtain a fourth optical signal set; and converting optical signals in the fourth optical signal set into colors in the second color space to obtain the fused image of the foreground image and the background image.