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. 

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Metaverse Space Ecological Scene Design Based on Multimedia Digital Technology

To solve the problem of cold shield matching in a cooled infrared (IR) imaging optical system with aperture stop placed away from the lens, a pupil matching method based on the telecentric optical structure is proposed. The formulae of Gaussian parameters between the relay lens and the objective lens are derived by using the ideal imaging process. A specific discussion and numerical analysis are carried out. The objective lens is designed as image-space telecentric and the relay lens is designed as object-space telecentric to achieve the requirement that the aperture stop far away from the objective lens. And a specific designing example is added to show the effectiveness of the analysis.

Cold shield matching of cooled infrared system based on telecentric optical structure

The design of the cooled infrared system can not avoid the problem of cold reflection, so it is necessary to complicate the optical system to weaken the influence of cold reflection. By analyzing the cold reflection characteristics of the cooled infrared system, the differential threshold cold reflection correction method is proposed, which can relax the restrictions on the cold reflection in the optical design stage, without considering the cold reflection. After the system is optimized, ray tracing is carried out to simulate the cold reflection phenomenon in the real scene, and then the cold reflection is eliminated by this method. A cooled infrared optical system is designed. After using this method, the image is clear subjectively, and many image quality evaluation functions are improved objectively. The results show that this method can effectively reduce the cold reflection of the cooled infrared system, simplify the design of the optical system, and is of great significance to the miniaturization and lightweight of the system.

Correction Method of Narcissus Effect of Cooled Infrared System Based on Differential Threshold

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