Layered Image Processing for Realistic Skin Subsurface Scattering
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Solution Overview
Problem
Existing image rendering technologies struggle to accurately depict the transparency and texture of human skin, lacking realism in the representation of subsurface scattering effects.
Innovation Solution
An image processing apparatus that generates image information by combining surface layer and inner layer data using first and second map data, employing ray tracing methods to simulate light reflection and subsurface scattering, thereby enhancing the realism of rendered images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If traditional rendering methods are used, then the rendering process is simple and fast, but the realism of skin texture and transparency is insufficient
Solution Approach 1:
The skin is segmented into multiple layers (epidermis, dermis, subcutaneous tissue) with distinct optical properties. Each layer is modeled separately with specific absorption and scattering characteristics, allowing realistic simulation of light interaction while maintaining manageable computational complexity through structured layering.
Solution Approach 2:
Different regions of the skin are assigned locally specific optical properties including varying absorption coefficients, scattering coefficients, and anisotropy factors. This allows heterogeneous skin characteristics (e.g., different pigmentation, thickness variations) to be represented accurately in different areas without requiring uniform complex modeling everywhere.
2Manufacturing precision
If subsurface scattering is simulated accurately, then the transparency effect is realistic, but the computational cost increases significantly
Solution Approach 1:
The rendering system uses parameter maps that store pre-computed optical properties (absorption coefficient, scattering coefficient, anisotropy) for different skin layers and regions. By changing and adjusting these parameters based on input data, the system can simulate various skin types and lighting conditions without re-computing the entire subsurface scattering model from scratch, reducing computational energy while maintaining accuracy.
3Loss of information
If multiple map data layers are combined, then the image information is more comprehensive, but the processing complexity increases
Solution Approach 1:
Multiple map data layers containing different types of information (optical properties, geometric data, texture information) are merged into a unified data structure. This consolidation allows comprehensive skin representation while simplifying the processing pipeline by providing all necessary information in an integrated format that can be accessed systematically during rendering.
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
The apparatus achieves realistic texture representation by accurately modeling light interactions within the skin layers, resulting in more lifelike images.
Implementation Method 1
a first generation process of using the first map data to generate surface layer image information based on light reflected from the surface layer of the object
Implementation Method 2
a second generation process of using the second map data to generate inner layer image information based on light passing through the surface layer of the object and scattered in the inner layer
Data Source
Figure 1~2
Figure 3
Figure 4(a)~4(b)
AI summary
There is provided an image processing apparatus 1 including a processor. The processor receives first map data and second map data, the first map data corresponding to a surface layer of an object, the second map data corresponding to at least one inner layer of the object, uses the first map data to generate surface layer image information based on light reflected from the surface layer of the object, uses the second map data to generate inner layer image information based on light passing through the surface layer of the object and scattered in the inner layer, and generates image information regarding the object by combining the surface layer image information and the inner layer image information thus generated.