3results about How to "Reduce projection" patented technology

This application relates to the field of civil engineering monitoring technology, and discloses a self-calibrated torsional decoupled displacement inversion method, system, and inclinometer. The self-calibrated torsional decoupled displacement inversion method includes: selecting a reference cluster of inclinometer links; preprocessing the original attitude observations of the measurement units to construct a chain-like synchronous observation matrix; performing azimuth self-calibration of the inclinometer links to obtain the azimuth reference angle of the measurement units; establishing bending and torsional channels, performing chain-like joint decoupling to obtain state estimates of the measurement units; performing cumulative displacement inversion to obtain the cumulative displacement vector; and outputting the inclinometer link displacement profile, estimated bending and torsional strength values ​​of each measurement unit, measurement confidence levels, and engineering interpretation results corresponding to the installation method. This application, through chain-like joint decoupling, reduces the projection and transmission of torsional factors into the displacement results, thereby improving the authenticity and accuracy of the displacement inversion.

The application discloses a binocular structured light 3D measurement method based on two-step phase shift, and relates to the technical field of computer vision and optical three-dimensional measurement. Firstly, a nonlinear correction method based on four-value defocus stripe optimization and cubic filtering is proposed, four-value defocus stripes are projected, the optimal four-value gray combination is screened by taking the residual sum of squares (SSE) and the coefficient of determination (R²) as quantitative indexes, and the system nonlinear correction is completed by combining the cubic increasing kernel rectangular filtering and the polynomial correction model. Secondly, a two-step phase shift algorithm with multi-step and multi-direction difference is proposed, the cosine component is extracted through stripe preprocessing, the difference operation of nine different steps and directions is completed by using the difference method to obtain the sine component, the sine and cosine component coefficients are calibrated by combining energy matching, and the final phase is output through phase level alignment and statistical fusion. Finally, the binocular stereo vision technology is fused, the phase, modulation degree and phase gradient joint matching features are combined, and the SGM algorithm is used to realize three-dimensional point cloud reconstruction.

The utility model discloses a nanometer hydrophobic building external wall brick which comprises a brick body, a clamping block and a clamping groove are arranged on the outer side of the brick body respectively, and water guide grooves are formed in the surface of the brick body at equal intervals. A protruding block is fixed to the side face of the clamping block, a deep groove is formed in the portion, located on the side face of the clamping groove, in the brick body, a limiting block is arranged on the inner wall of the deep groove, and a reset spring is installed between the end of the limiting block and the inner wall of the deep groove. According to the nano hydrophobic building external wall brick, a directional drainage path is formed through the design that the multiple water guide grooves are formed in the surface of the brick body, rainwater on the brick surface is rapidly guided to the bottom of an external wall, the residence time of water on the brick surface and gaps is shortened, meanwhile, rainwater can be rapidly guided into the water guide grooves through the arranged hydrophobic rods, and the water drainage effect is improved. Accumulated water is prevented from diffusing on the brick surface, the drainage efficiency is improved, the adjacent brick bodies are quickly assembled together through the L-shaped clamping blocks and the clamping grooves, and construction is convenient.