8results about How to "High compressibility" patented technology

This invention discloses a method for evaluating the multi-dimensional coupling aerodynamic performance of a modal selector valve and an engine, belonging to the field of aero-engines. The steps are as follows: establishing a three-dimensional model of the modal selector valve; simulating the model to obtain its flow performance; establishing a computational model of the modal selector valve and calculating the total pressure after the valve; integrating a high-fidelity characteristic calculation model of the component with a zero-dimensional model of the entire engine; inputting the engine's design point performance parameters and performing design point calculations; given the engine control law and the engine's non-design point operating conditions, performing calculations; determining the convergence of the computational model; obtaining the engine characteristic diagram and aerodynamic performance under arbitrary operating conditions, thus obtaining the aerodynamic performance results considering the overall coupling effect of the modal selector valve and the engine. This invention solves the problems in existing technologies where the calculation accuracy of the overall performance calculation code for variable cycle engines cannot meet the design requirements of variable cycle engines, and the coupling of various engine components is poor.

An image encoding / decoding method and a method for transmitting bitstreams are disclosed. The method for decoding a 360-degree image, performed by an image decoding device, includes: receiving a bitstream encoded with a 360-degree image, the bitstream including data of an extended two-dimensional image, the extended two-dimensional image including a two-dimensional image and a predetermined extended region, and the two-dimensional image being projected from an image having a three-dimensional projection structure and including one or more surfaces; generating a predicted image by performing a prediction based on prediction information included in the bitstream; and reconstructing the extended two-dimensional image based on the predicted image and a residual image.

A video encoding method and apparatus are disclosed. An intra prediction method for video decoding includes determining an intra prediction mode belonging to an initial directional prediction range for an intra prediction of an MxN current block, determining whether to correct the intra prediction mode from the initial directional prediction range to a corrected directional prediction range based on a horizontal length N and a vertical length M of the MxN current block, determining a corrected intra prediction mode belonging to the corrected directional prediction range, and performing the intra prediction of the MxN current block based on the corrected intra prediction mode, the initial directional prediction range including a first prediction range, a second prediction range, and a third prediction range, the corrected directional prediction range including the first prediction range, the second prediction range, and a fourth prediction range according to the vertical length M, the intra prediction being performed by using reference regions adjacent to the current block, the reference regions including an upper reference pixel column and a left reference pixel column of the current block.

A video encoding method and apparatus are disclosed. An intra prediction method for video decoding, comprising: determining an intra prediction mode belonging to an initial directional prediction range for an intra prediction of an MxN current block; determining whether to correct the intra prediction mode from the initial directional prediction range to a corrected directional prediction range based on a horizontal length N and a vertical length M of the MxN current block; determining a corrected intra prediction mode belonging to the corrected directional prediction range; performing the intra prediction of the MxN current block based on the corrected intra prediction mode, the initial directional prediction range comprising a first prediction range, a second prediction range and a third prediction range, the corrected directional prediction range comprising the first prediction range, the second prediction range and a fourth prediction range according to the vertical length M of the MxN current block, the intra prediction of the MxN current block being performed by using a reference region adjacent to the MxN current block.

A method for decoding a video signal and an apparatus therefor are provided. Specifically, a method for decoding a picture can include the steps of, when a current coding tree block is out of a boundary of a current picture, partitioning the current coding tree block into a plurality of coding blocks such that the coding blocks obtained by partitioning the current coding tree block are included in the current picture, when a current coding block satisfies a predetermined condition, parsing a syntax element indicating whether the current coding block is partitioned into a plurality of sub-blocks, and determining a partition mode of the current coding block based on the syntax element.

The invention provides a pump body structure, fluid machinery and heat exchange equipment, the pump body structure comprises a first air cylinder, at least one second air cylinder and a crankshaft, the volume of the first air cylinder is smaller than or equal to 80% of the volume of the second air cylinder, the crankshaft is provided with a first eccentric part and a second eccentric part, the first eccentric part is arranged in the first air cylinder, and the second eccentric part is arranged in the second air cylinder. The second eccentric part is arranged in the second cylinder, and the diameter D1 of the first eccentric part and the diameter D2 of the second eccentric part satisfy 0.3 < = D1 / D2 < = 0.8. According to the pump body structure, the size setting of the first eccentric part arranged in the first air cylinder and the second eccentric part arranged in the second air cylinder is adopted, leakage reduction of the pump body structure in the operation process is facilitated, the friction power consumption of moving parts is reduced, the compression efficiency of the pump body structure is improved, and the service life of the pump body structure is prolonged. Therefore, the problem of low efficiency of a compressor with independent compression of large and small cylinders in the prior art can be solved.

The application discloses a point cloud entropy encoding method and device, a point cloud entropy decoding method and device, and a readable storage medium, and relates to the technical field of point cloud coding and decoding, so as to improve the point cloud compression performance. The method comprises the following steps: obtaining a transform coefficient of a point cloud frame to be encoded; determining a target encoding mode according to the transform coefficient; and performing entropy encoding on the point cloud frame to be encoded by using the target encoding mode. The transform coefficient comprises a direct current (DC) coefficient and an alternating current (AC) coefficient. At least part of the DC coefficient and / or the AC coefficient is arranged separately according to a color channel. The embodiment of the application can improve the point cloud compression performance.

The application belongs to the technical field of video coding, and discloses an indoor monitoring video coding method based on human-computer collaborative perception, which comprises the following steps: 1, building a human-computer collaborative video coding framework; 2, compact feature representation of specific semantic objects; 3, adaptive background updating; 4, residual coding resource allocation.The application proposes an adaptive background updating framework to dynamically update the background according to the characteristics of indoor monitoring video, considers that specific foreground semantic objects in the indoor monitoring video can be represented by compact semantic features, extracts compact semantic feature representation for specific foreground semantic objects through a feature extraction network, formulates a residual coding resource allocation strategy for a traditional encoder, avoids useless coding resource allocation, improves the human eye visual quality of the decoded video, greatly improves the compression performance of the indoor monitoring video, and realizes efficient specific semantic information retrieval and analysis.