Yuan cosmos is a virtual world linked and created by scientific and technological means, which is mapped and interacted with the real world, and a digital living space with a new social system. With the increasing popularity of data acquisition and production equipment, people are increasingly convenient to produce multimedia data such as images, graphics, audio, video, animation, and three-dimensional models. In addition to the rapid development of digital technology itself, the biological information technology related to digital technology also greatly promotes the emergence of the metauniverse. This paper aims to study the application of multimedia digital technology to the ecological scene design of metauniverse space, introduces the related concepts of metauniverse and multimedia digital technology, expounds the related methods of multimedia digital technology and neural network related algorithms, and then takes the three-dimensional simulation of the auditory system in the interactive multisensory simulation system of the constituent elements of metauniverse as an example. The mel-frequency cepstrum coefficient (MFCC) is used to simulate the auditory characteristics of the auditory periphery (cochlea) as the perceptual end of the model. A variety of bionic mechanisms are used in the model, such as designing the connection mode of neurons, learning state and release effect, and the regeneration mechanism of neurons. For the verification of the performance of the model, the speech sample database, including English words and phrases, is recorded and the speech content information recognized by the model by means of speech recognition is experimented. The experimental results show that, in terms of phrase accuracy, the DN-1 model improves 2.59% and the DN-2 model improves 2.77% compared with MFCC feature on the basis of mixed features. When only DBN features are used, the performance improvement rate of the developmental network model is small. 

/pdf/metaverse-space-ecological-scene-design-based-on-multimedia-1soym5o2.pdf

Metaverse Space Ecological Scene Design Based on Multimedia Digital Technology

Weakening the mechanical property anisotropy of additively manufactured medium entropy alloy by controlling the cellular structure

Microstructure and mechanical properties of an in-situ TiB2 particle reinforced AlSi10Mg composite additive manufactured by selective electron beam melting

Herein, a novel corrugated inner rib reinforced tubular structures and a gradient design method are proposed. The mechanical response, interaction effect and gradient effect of the proposed tubular structures are systematically studied by means of experiment and numerical simulation. It is found that the corrugated inner rib reinforced tubular structures exhibit a progressive and stable deformation process under axial compression. Compared with the traditional straight inner rib reinforced tubular structures, the initial peak crush force (IPCF) of the corrugated inner rib reinforced tubular structure has a maximum decrease of 26.07%, and the mean crush force (MCF), crush force efficiency (CFE), specific energy absorption (SEA) has a maximum increase of 40.71%, 49.03% and 49.82%, respectively. In addition, Co-Co-inner-2 has a considerable interaction effect, which increases its energy absorption by 249.77%. However, although the gradient configuration effectively improves the SEA and MCF of the tubular structure, it brings an increase in IPCF. The SEA capacity of the corrugated inner rib reinforced tubular structures in this work is 27.12–56.77 J/g, which shows a satisfactory weight efficiency. The proposed structures can provide a useful reference for energy absorption devices in the national defense, aerospace and automotive industries. 

Mechanical behavior and crashworthiness assessment of corrugated inner rib reinforced tubular structures

Unique cellular microstructure-enabled hybrid additive and subtractive manufacturing of aluminium alloy mirror with high strength

Anisotropy reduction of additively manufactured AlSi10Mg for metal mirrors

A dual-channel inverse synthetic aperture ladar imaging experimental system based on wide-pulse binary phase coded signals and its moving target imaging are introduced. The analysis, simulation, and experimental data processing results of binary phase coded signal Doppler compensation and pulse compression are included. The method of motion phase error estimation based on interferometric processing and the imaging method with small computation in the case of large squint angles are proposed, and the simulation results are presented. The effectiveness of the imaging method is verified by experimental data processing. Doppler frequency curves are estimated based on time-frequency analysis of echo signals, and the coarse compensation of motion phase error is realized. According to the interferometric phase and coherence coefficient of dual-channel echo signals' time-frequency analysis, the coherence of the dual-channel echo signals is checked, and along-track interferometry can be applied to the precise compensation. The stable interferometric phase and increased coherence coefficient of actual dual-channel data imaging results indicate the effectiveness of the motion phase error compensation method proposed. Considering characteristics of inverse synthetic aperture ladar (ISAL) imaging, after dividing echo signals into multiple sub-apertures, range-Doppler algorithm and sub-aperture stitching are adopted, the stitched image is corrected geometrically through Stolt transformation, and the computation is reduced.

Moving target imaging of a dual-channel ISAL with binary phase shift keying signals and large squint angles.

Structure design of two-axis fast steering mirror for aviation optoelectronic platform

Diffractive optical elements (DOEs) are difficult to apply in natural scenes imaging covering the visible bandwidth-spectral due to their strong chromatic aberration and the decrease in diffraction efficiency. Advances in computational imaging make it possible. In this paper, the image quality degradation model of DOE in bandwidth-spectral imaging is established to quantitatively analyze its degradation process. We design a DDZMR network for a single-lens diffractive lens computational imaging system, which can simultaneously perform image restoration and image super-resolution reconstruction on degraded images. The multimodal loss function was created to evaluate the reconstruction of the diffraction imaging degradation by the DDZMR network. The prototype physical prototype of the single-lens harmonic diffraction computational imaging system (SHDCIS) was built to verify the imaging performance. SHDCIS testing showed that optical chromatic aberration is corrected by computational reconstruction, and the computational imaging module can interpret an image and restore it at 1.4 times the resolution. We also evaluated the performance of the DDZMR model using the B100 and Urban100 datasets. Mean Peak Signal to Noise Ratio (PSNR)/Structural Similarity (SSIM) were, respectively, 32.09/0.8975 and 31.82/0.9247, which indicates that DDZMR performed comparably to the state-of-the-art (SOTA) methods. This work can promote the development and application of diffractive imaging systems in the imaging of natural scenes in the bandwidth-spectrum.

/pdf/computational-imaging-for-simultaneous-image-restoration-and-22hgqrgm.pdf

Computational Imaging for Simultaneous Image Restoration and Super-Resolution Image Reconstruction of Single-Lens Diffractive Optical System

Due to the high reflectivity of the resistor array in the target scene generator (TSG), the narcissus effect caused by the resistor array is notorious. Based on the paraxial analysis of the resistor array, the telecentric structure in the image space is proposed to reduce the narcissus effect induced by the resistor array. A TSG with the telecentric structure in the image space and a TSG with the nontelecentric structure in the image space, which have same system parameters, are designed and optimized. The nonsequential ray tracing technique is used for both TSGs to evaluate the narcissus effect induced by the resistor array. The simulation results show that using a telecentric structure in the imaging space is an effective method to suppress the narcissus signal caused by the resistor array.

Design and simulation of a target scene generator with a telecentric structure in the image space

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