Dermoscopy Image Pigment Separation for Melanin and Vascular Visualization
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Solution Overview
Problem
Conventional dermoscopy imaging techniques struggle to capture high-quality diffuse reflection images due to limitations in imaging geometry, illumination, and polarizing filter alignment, leading to compromised tissue pigmentation information, especially in non-flat or curved skin areas and large field-of-view scenarios, which hinders accurate evaluation of skin lesions.
Innovation Solution
A method and apparatus for enhancing or reducing the appearance of pigment components in diffuse reflectance images by processing RGB images using RBX transformation to separate melanin and hemoglobin distributions, allowing for better visualization of skin structures and patterns through image correction and blending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If conventional reflectance imaging is used to capture skin images, then the imaging process is simple and fast, but the tissue pigmentation information is compromised and melanin structures cannot be properly separated from vascular structures
Solution Approach 1:
The patent segments the mixed reflectance signal into separate melanin and vascular components by capturing images at multiple wavelengths. Each wavelength provides information about different tissue chromophores, allowing the system to separate melanin structures from vascular structures through spectral unmixing algorithms.
Solution Approach 2:
The patent adds the spectral dimension to traditional reflectance imaging by capturing images at multiple wavelengths across the visible and near-infrared spectrum. This transforms the imaging from a single-intensity measurement to a multi-dimensional spectral measurement, enabling differentiation of tissue chromophores based on their unique spectral signatures.
2Measurement precision
If cross-polarized imaging is used to reduce surface reflection, then diffuse reflection information is improved, but the imaging geometry and polarizing filter alignment requirements become complex and limit field-of-view
Solution Approach 1:
The patent changes the wavelength parameter of illumination light to differentiate tissue chromophores. By illuminating at multiple wavelengths and measuring the spectral reflectance characteristics, the system can identify and separate melanin and vascular contributions without relying on complex polarizing geometries, thus simplifying the imaging setup while maintaining measurement precision.
3Loss of information
If multiple wavelengths are used to separate melanin and vascular structures, then tissue chromophore differentiation is improved, but the imaging time and data processing complexity increase
Solution Approach 1:
The patent performs preliminary action by pre-calculating and storing spectral signature profiles for melanin and hemoglobin across the imaging wavelength range. During actual imaging, the system quickly acquires multi-wavelength data and uses pre-computed spectral unmixing algorithms to rapidly separate chromophore contributions, significantly reducing processing time compared to real-time spectral analysis.
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
Enables improved visualization and identification of skin pigmentation patterns and vascular structures by separating superficial and deeper melanin components, facilitating accurate classification and analysis of skin lesions.
Implementation Method 1
The diffuse reflection component, which is due to light that has interacted with the tissue interior, conveys information about the optical properties of the tissue such as the distribution of chromophores like melanin and hemoglobin.
Implementation Method 2
Some photons of the incident light penetrate within the tissue and undergo multiple scattering and absorption events before some of those photons are back-scattered as diffuse reflected light.
Implementation Method 3
Some photons of the incident light penetrate within the tissue and undergo multiple scattering and absorption events before some of those photons are back-scattered as diffuse reflected light.
Data Source
AI summary
Methods and apparatuses are disclosed for modifying images of skin so as to reduce or enhance the appearance of component pigments, such as melanin and hemoglobin. A diffuse reflectance image of skin, such as a cross-polarized contact dermoscopy image, which conveys information regarding subsurface features of the skin, is processed so as to extract pigment distribution information, which is then used to correct the diffuse reflectance image, such as by reducing the appearance of melanin to allow better visualization of hemoglobin-related structures, such as vasculature. Alternatively, the diffuse reflectance image can be corrected so as to reduce the appearance of hemoglobin to allow better visualization of melanin-related structures.