8 results about "Optical modeling" patented technology

The invention relates to the technical field of image processing, and discloses a facial health state assessment method and system based on layered optical modeling. The objective of the invention is to solve the problems of poor face health state evaluation precision and robustness caused by rough optical modeling, mixed reflection components, weak environmental adaptability and insufficient multi-dimensional health index fusion capability in the prior art. The method comprises the following steps: synchronously acquiring a user face video sequence comprising at least two different spectral bands through a multispectral imaging device; constructing a multilayer optical transmission model of the skin tissue, and separating a specular reflection component and a diffuse reflection component from the face video sequence; extracting a physiological time sequence signal related to subcutaneous blood flow activity from the separated diffuse reflection component, and calculating heart rate, heart rate variability and blood oxygen saturation parameters; and fusing the physiological parameters and expression and micro-expression features extracted from the facial video sequence, and outputting quantitative evaluation results of fatigue degree, pressure level and emotional state through a pre-trained deep neural network model. The system comprises a multispectral image acquisition module, a layered optical modeling module, a reflection component separation module, a physiological parameter inversion module and a health state evaluation module. According to the technical scheme, the signal-to-noise ratio and stability of physiological signal extraction in a complex illumination environment can be remarkably improved, the adaptability to individuals with different skin colors and dynamic illumination conditions is enhanced, and more accurate and more robust judgment of the high-order health state is achieved.

The application relates to the field of photoetching technology, in particular to a method and device for calculating a focus point of a photoetching light beam and a computer device, the method comprises the following steps: S0, acquiring a critical dimension of a mask pattern; S1, establishing a focus depth model according to the critical dimension and a preset optical modeling model; S2, under a preset metrology level, bringing the critical dimension into the focus depth model, and calculating a focus point offset of the critical dimension and feature information through a preset first algorithm; and S3, calculating a final focus point of the critical dimension through a preset second algorithm according to the focus point offset and the feature information. The method provided by the application considers the focus point offset and the focus depth information, and can more accurately find the focus point of the photoetching light beam.

1. Name of the product in this design: Visual monitoring radar with expansion dock. 2. Application of this design: It is used as a visualized micro-change monitoring radar for geological disasters, engineering construction and emergency rescue support, and also has extended functions such as three-dimensional optical modeling and coordinate positioning. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: 3D view 1.

An efficient computational method for cross-scale optical modeling of micro / nano-structured solar cells is presented, belonging to the field of solar cell design and simulation technology. This method decomposes a cross-scale solar cell containing a micro / nano pyramid structure into a top micro / nano structure layer and a middle and bottom multi-layer planar structure, respectively simulated using the finite element method (FEM) and transmission matrix theory (TMT): FEM accurately calculates the polarized light transmission and reflection coefficients of the top micro / nano structure, considering multi-order diffraction effects; TMT efficiently calculates the polarized light transmission characteristics of the middle and bottom multi-layer planar structure; and finally, the total absorption, reflection, and transmission spectra and photocurrent of the cell are integrated through coupled formulas. This invention solves the problem of balancing accuracy and efficiency in cross-scale structure modeling using traditional single simulation methods, achieving a computational speed more than 50 times faster than traditional full FEM simulation with an error of less than 5%.

The invention discloses a digital human real-time generation method and system fusing a layered light transmission model, and relates to the technical field of digital human modeling and real-time rendering. The method comprises the following steps: collecting optical parameters of each layer of skin, constructing a layered skin light transmission model and a radiation flux equation of each layer, carrying out layered adaptive photon mapping sampling, fusing radiation transmission results of each layer through a neural network accelerator, generating a skin material containing a dynamic reflectivity field, and outputting the skin material containing the dynamic reflectivity field. And finally, binding the optimized skin with a skeleton animation system in real time, and outputting a rendered digital human. Through layered optical modeling, dynamic sampling optimization, hardware acceleration rendering and the like, the skin optical optimization result is deeply embedded into the digital human modeling process, the skin rendering precision is improved, the dynamic adaptability is enhanced, and the problems that in the prior art, the skin of a digital human is not real, dynamic response is delayed, and the digital human is not real are solved. The skin texture and the muscle movement are not synchronous, and the like.

This invention provides a method for predicting the lifespan of an extreme ultraviolet pellicle using its transmittance. [Solution] The present invention provides a method for predicting the lifetime of an extreme ultraviolet pellicle, comprising the steps of: a) obtaining transmittance data of an extreme ultraviolet pellicle in a wavelength band from the infrared region to the ultraviolet region; b) obtaining complex refractive index data of an extreme ultraviolet pellicle in a wavelength band from the infrared region to the ultraviolet region; c) performing optical modeling using the transmittance data and the complex refractive index data to obtain information on the relationship between the density and transmittance of the extreme ultraviolet pellicle according to the wavelength; and d) measuring the transmittance of an extreme ultraviolet pellicle to at least one measurement beam having a wavelength belonging to the wavelength band from the infrared region to the ultraviolet region, extracting an estimated density of the extreme ultraviolet pellicle based on the measured transmittance and the information on the relationship between density and transmittance obtained in step c), thereby predicting the remaining lifetime of the extreme ultraviolet pellicle.

Provided is an improved method, system, and computer program product to implement simulation for photonic devices. A composite, multi-domain simulation model is disclosed, with connected domain-specific representations that allow the use of the most relevant simulator technology for a given domain. The model has external connection points either expressed as actual ports or virtual ones, embodied by simulator API calls in the model.