40results about How to "Guaranteed Compression Efficiency" patented technology

The invention discloses a HEVC inter-frame prediction mode selection method and device, which are used to reduce the complexity of inter-frame prediction mode selection and improve processing efficiency. The method is: when determining that the pixel size of the coding unit CU block of the current frame is within a set range, calculate and obtain the first rate-distortion cost of each inter-frame prediction mode of the CU block based on the absolute error and the SAD algorithm; according to the obtained The first rate-distortion cost of each inter-frame prediction mode, the optimal first rate-distortion cost SadCost0 and the corresponding first inter-frame prediction mode and the suboptimal first rate-distortion cost SadCost1 and the corresponding second inter-frame prediction mode ; When it is determined that (SadCost1-SadCost0) / SadCost0 is greater than a threshold, select the first inter-frame prediction mode as the optimal inter-frame prediction mode of the CU block.

A dust collection barrel provided with a speed-changing compressed structure comprises a bottom cover connected at the bottom end of a barrel body, a baffle, a compressed plate and a connecting shaft driving the compressed plate to rotate, wherein the baffle and the compressed plate are arranged inside the barrel body, and a high-speed gear, a low-speed gear and a speed regulating knob which is connected with the high-speed gear and the low-speed gear are arranged on the lower side of the bottom cover. According to the dust collection barrel provided with the speed-changing compressed structure, the high-speed gear, the low-speed gear and the speed regulating knob which is connected with the high-speed gear and the low-speed gear are arranged at the bottom of the dust collection barrel. The speed regulating knob is rotated, the gears driving the compressed plate are switched, and the rotating speed of the compressed plate is changed. A user can regulate the rotating speed of the compressed plate of the dust collection barrel according to actual needs of a dust collector and types of inhaled dust. For example, if large and hard dust is needed to be inhaled, the speed is regulated to be slow, and when floccus soft dust is needed to be inhaled, the speed is regulated to be fast. Therefore, compressing efficiency of the dust collector is ensured, and service life of the compressed plate is prolonged.

The invention discloses a rotary air compressor head which comprises a cylinder body, a translation piston, a slide plate and a crankshaft, wherein a rotation center of the crankshaft is concentric with the cylinder body; the translation piston is arranged on the crankshaft; the side face of an external circumference of the translation piston is tangent with the inner side face of the circular cylinder body to form a crescent operation cavity; an air inlet channel and an air outlet channel communicated with the operation cavity are arranged on the cylinder body; the translation piston is rotationally connected with the crankshaft via a bearing; a mounting groove for mounting the slide plate is formed in the side face of an internal circumference of the cylinder body; the slide plate is mounted in the mounting groove; one end of the slide plate is contacted with the translation piston; an elastic return piece is arranged at one end, far away from the translation piston, of the slide plate; a slide groove is formed in a side wall of the mounting groove; a slide bar is arranged in the slide groove and pushes against the side face of the slide plate; and an elastic slide piece is arranged at one end, far away from the slide plate, of the slide bar. The air compressor head can keep stable compression efficiency and is long in service life, and the maintenance cost is lowered effectively.