Visual transformers (ViTs) are widely used in various visual tasks, such as fine-grained visual classification (FGVC).However, the Point self-attention mechanism, which is the core module of visual transformers, leads to quadratic computational and memory complexity.The sparse-attention and local-attention approaches currently used by most research

Visual SLAM algorithms Board Game allow localizing the camera by mapping its environment by a point cloud based on visual cues.To obtain the camera locations in a metric coordinate system, the metric scale of the point cloud has to be known.This contribution describes a method to calculate the metric scale for a point cloud of an indoor environment

We propose a three-dimensional waveguide structure for the realization of mode-selective switches, where the high-order spatial modes of a few-mode waveguide can be switched to various single-mode waveguides with thermo-optically controlled vertical asymmetrical directional couplers.To demonstrate the idea, we design and fabricate two specific devi

The Metaverse envisions a future where immersive online interactions become the norm.However, this vision can only be safely realized if user safety and privacy are prioritized.This review critically evaluates existing user safety and security measures within the Metaverse.We have highlighted the limited ability of existing solutions to protect aga