6results about How to "Reduce Motion Artifacts" patented technology

The application discloses a liquid metal-based shape-insensitive flexible conductive fabric and a preparation method and application thereof. The preparation method comprises the following steps: preparing a thermoplastic polyurethane elastomer (TPU) fiber pad and a liquid metal (LM) microsphere solution; uniformly depositing and trapping the LM microspheres in the pores of the TPU fiber pad through vacuum filtration; and hot-pressing the TPU fiber pad filled with the LM microspheres to make the LM microspheres break and fuse, so that a continuous conductive path is formed, and a flexible conductive fabric is obtained. The conductive fabric takes the TPU fiber pad as a flexible skeleton, and provides good deformation and recovery capacity; the LM is a conductive filler, and has excellent conductivity and fluidity. When various deformations such as stretching, bending, compression and twisting occur, the LM can deform synchronously with the TPU fiber skeleton and does not leak, and has good shape-insensitive conductivity. The conductive fabric can be applied to the fields of flexible high-conductive electrodes, flexible circuits, electromyographic signal monitoring, electrocardiographic signal monitoring and heat management.

This invention discloses an indoor mid-to-long-range camera heart rate detection method and system with resistance to environmental interference. The host computer acquires one video stream from each camera to determine the video frame sequence of the current optimal viewing angle. Face detection, tracking, and ROI localization are performed on the video frame sequence to obtain the face ROI region for each video frame. Rigid motion noise filtering is applied to the video frame sequence to obtain an aligned frame sequence and a reference frame sequence. The face ROI region of each aligned frame is determined based on the face ROI region of the reference frame. The ROI signal is determined based on the face ROI region of the aligned frame, and non-rigid noise is filtered out to obtain a pulse wave signal. The heart rate value corresponding to the current sliding window is determined based on the pulse wave signal, and a corresponding quality score is determined. This, combined with a preset correspondence between distance and available focal length, allows for adaptive adjustment of the camera focal length. This invention exhibits high robustness, accuracy, and stability.

The utility model discloses a wrist joint examination positioner which comprises a supporting part, and a lifting part is arranged on one side of the supporting part. The height of the lifting part is greater than that of the supporting part; a fixing frame is further arranged on the lifting part. And the fixing frame is U-shaped. After the palm of the patient is placed on the fixing frame and the elbow of the patient is located on the supporting part, the hand of the patient presents a high-wrist and low-elbow layout. The open type structure has good adaptability to obese, thin and weak patients or patients with plaster external fixing devices. Meanwhile, due to the design that the front portion is high and the rear portion is low, the comfortable experience of the patient in the posture placing process is improved, motion artifacts are reduced, the examination time is shortened, meanwhile, the examination quality can be improved, and based on the design, the examination bed is worthy of application and popularization.

The invention provides transcranial electrical stimulation equipment, and particularly relates to the technical field of brain-computer interfaces, and the equipment comprises an electrical stimulation electrode array which is used for carrying out transcranial electrical stimulation and electroencephalogram signal collection on a target stimulation object; the electrical stimulation electrode array comprises a plurality of electrodes, and each electrode is provided with an electrode contact; each electrode contact is covered with an interface modification layer, the interface modification layer comprises a first hydrogel layer and a second hydrogel layer which are stacked in sequence, the first hydrogel layer is attached to the electrode contact, and the second hydrogel layer is used for making contact with the target stimulation object; the modulus of the first hydrogel layer is higher than that of the second hydrogel layer; the electrical stimulation control element is connected with the electrical stimulation electrode array and used for controlling current output of the electrical stimulation electrode array according to the electroencephalogram signals collected by the electrical stimulation electrode array. The quality and reliability of the electroencephalogram signals are improved.

The present application relates to the field of machine vision defect detection, and discloses a COF substrate ink defect visual detection and analysis system, which comprises a topology prior module for calculating a linear polarization degree matrix and generating a topology mask matrix in combination with a CAD drawing; a variable-frequency projection module for giving high-frequency parameters and low-frequency parameters to high and low reflection areas respectively based on the topology mask matrix, and generating a fringe sequence; a collection and demodulation module for acquiring a polarization image by projecting the fringe sequence, processing light intensity values and extracting an alternating current matrix; a characteristic tensor module for calculating a polarization matrix and a frequency-variable depolarization rate, generating a weight matrix based on the topology mask matrix, and fusing and constructing a descriptor tensor; and a defect classification module for searching the descriptor tensor to extract surface-type and internal-type defects, combining the weight matrix to extract penetrating defects and outputting labels. The present application blocks bottom metal reflection crosstalk through spatial frequency adaptive modulation, fuses multi-dimensional physical parameters and prior weights to remove interference artifacts, and realizes accurate classification of cross-layer defects of composite substrates.

The application provides a method for preparing an ultrasonic transducer for transparent rigid piezoelectric material. The method first cuts from the piezoelectric layer side of the piezoelectric wafer with a transparent matching layer, leaving a certain thin layer without cutting through completely, to provide overall mechanical support and ensure that the array elements are arranged at a predetermined interval. Then, a transparent organic elastic material is injected into the array element gap, and the support after solidification further fixes the array element position to realize precise bonding of high-density array elements and flexible circuit electrodes. In the subsequent cutting through of the remaining thin layer, the array elements are effectively supported by the transparent elastic material and are not easily damaged, thereby significantly improving the process reliability and array element yield. The method effectively protects the brittle piezoelectric material and supports the manufacture of high-density, large-array flexible arrays. The obtained device realizes high flexibility with the aid of the transparent elastic material in the array element gap and the flexible circuit; and high sensitivity ultrasonic performance is obtained through the design of the double-layer matching layer and the backing.