32results about How to "Avoid specular reflections" patented technology

The invention discloses a subway crowd density estimation method and system based on target detection, and the crowd density estimation method comprises the following steps: firstly carrying out the bounding box labeling of the head of a human body in a manufactured sample library; secondly, introducing a YOLOv3 network, converting receptive fields of three scales into receptive fields of two scales by using an up-sampling operation, performing up-sampling on the outputs with different receptive fields, fusing the up-sampled outputs with outputs of the same scale, and taking the fused outputsas a final training network; and finally, determining the ROI of the detection video image frame by using a mask mode. Through human head detection, fusion detection of different scales output by a network and ROI region operation, the problem of mutual shielding among part of human bodies is solved, the problems of subway station building shielding and specular reflection are avoided, and the performance of crowd density estimation is improved.

The invention relates to a light integrating cavity device, such as an integrating sphere, for measuring diffuse reflectance of a sample. A light trap is movable within a light scattering cavity of the device for controlling specular reflections during measurements. The light trap may be rotatable around the sample under test inside the cavity so that specular reflections off the sample can be included or excluded from the measurement. The sample may also be placed at the outside against a measurement port, and a measurement instrument is moveable on a rotating arm within or outside of the cavity.

The invention discloses a high-definition monitoring system for municipal roads, which includes a monitor. A protective top cover is welded on the outer surface of the top end of the monitor, and a collecting funnel is welded on the outer surface of the top end of the protective top cover near the front end. The inside of the funnel is provided with a collecting tank. A high-definition monitoring system for municipal roads according to the present invention, by installing two lighting lamps at the bottom of the monitor, can supplement light for the shooting of the monitor; secondly, by installing a self-locking motor inside the connecting frame, It is convenient to pull the lighting, so that the lighting can be focused on the surface of objects at different positions, improving the clarity of the shooting, and the light is emitted from both sides of the monitor, which can avoid the mirror reflection of the light on the surface of the object, and further improve the shooting effect. The difficulty of repairing the monitor can be reduced by installing various components inside the monitor into the installation groove in advance.

An ultrasonic tool comprising a first end face and a second end face, which is opposite the first end face, as well as a tool cover surface connecting the first end face and the second end face, wherein the ultrasonic tool is elongated in a longitudinal direction of the tool, wherein at least the first end face is formed as a connecting contact surface, which is arranged for pressing the ultrasonic tool against a connecting component, and wherein the ultrasonic tool comprises an end region comprising the connecting contact surface, which extends from the connecting contact surface in the longitudinal direction of the tool over 15 mm, but at most extends one third of the length of the ultrasonic tool in the direction of the opposite end face, and wherein in the end region, a first partial surface of the tool cover surface is formed as a surface-structured absorption surface.

The invention belongs to the technical field of display screen preparation, and specifically relates to a fluorescent display screen containing an up-conversion luminescent material and a preparationmethod and an application thereof. The display screen comprises a substrate, a red fluorescent material layer, a green fluorescent material layer, a first isolation layer, a blue fluorescent materiallayer and a protective layer which are successively superimposed, wherein the green fluorescent material layer and the red fluorescent material layer are further provided with a second isolation layertherebetween. The display screen is made of an ultra-flat transparent material, thereby being capable of avoiding a phenomenon of diffuse reflection. The adopted organic or macromolecular green and blue fluorescent materials are anisotropic, thereby being capable of avoiding a phenomenon of mirror reflection. Saturated red light can be obtained by adopting the up-conversion luminescent material,the light emitting efficiency is high, and the stability is good. When the screen takes laser light as a light source, the resolution reaches up to 10k. The fluorescent display screen is simple in preparation method, low in cost and long in service life. The fluorescent display screen is portable, can be folded and unfolded, water-proof and not driven by electric power, so that the fluorescent display screen can be applied to many fields.