Image Rendering with SDR-HDR Color Standard Conversion
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Solution Overview
Problem
Videos edited from multimedia materials with different color display standards, such as SDR and HDR, often exhibit significant visual differences due to differing color spaces and brightness ranges, leading to suboptimal display effects and reduced user experience.
Innovation Solution
An image processing method and apparatus that converts multimedia materials to a target color display standard, aligning color display standards across multiple materials to ensure consistent visual effects by utilizing electro-optical and optical-electrical transfer functions, along with gamut mapping, to achieve seamless integration and rendering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multimedia materials with different color display standards (SDR and HDR) are edited together without conversion, then the video editing process is simple and fast, but the display effect is poor with significant visual differences
Solution Approach 1:
The system performs preliminary detection of color display standards for each multimedia material before editing operations. By identifying the color space type (SDR or HDR) in advance, the system can proactively apply appropriate conversion operations to ensure consistency, rather than dealing with display issues after editing is complete.
Solution Approach 2:
The system dynamically changes color space parameters by applying electro-optical transfer functions (EOTF) and optical-electrical transfer functions (OETF) to convert materials between SDR and HDR formats. This parameter transformation allows materials with different color display standards to be unified into a consistent target standard, resolving visual inconsistencies.
2Manufacturing precision
If color space conversion is applied to all multimedia materials, then visual coherence is improved, but the processing time and computational resources increase
Solution Approach 1:
Instead of uniformly converting all multimedia materials, the system applies conversion operations only to specific materials that require it. By detecting the color display standard of each material individually and applying conversion only where necessary, the system achieves visual coherence while minimizing unnecessary processing time and computational overhead.
3Illumination intensity
If gamma encoding differences are not addressed, then the editing process remains simple, but brightness ranges show significant visual differences
Solution Approach 1:
The system introduces transfer functions (EOTF and OETF) as intermediary mathematical models to bridge the gamma encoding differences between SDR and HDR materials. These transfer functions act as mediators that systematically transform brightness values from one gamma encoding standard to another, ensuring consistent brightness range representation across all multimedia materials.
Data Source
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Figure 2B~3
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AI summary
The present disclosure relates to an image processing method and apparatus, an electronic device and a readable storage medium. The method comprises: traversing a plurality of multimedia materials, and according to a target color display standard, determining a multimedia material of a non-target color display standard included in the plurality of multimedia materials; converting the multimedia material of the non-target color display standard into a multimedia material of the target color display standard; and performing image rendering on the plurality of multimedia materials according to the target color display standard, so as to display the plurality of multimedia materials according to the image rendering result or export the plurality of multimedia materials as a video file in a specific format according to the image rendering result.