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Low-illumination image processing method and device

ActiveUS20180182074A1Enhance the imageClear and vivid restored imageImage enhancementImage analysisColor imageIlluminance
A low-illumination image processing method and device address the problem of noise amplification in existing contrast enhancement techniques when applied to original low-illumination image. A noise suppression filter is additionally arranged before an operation of contrast enhancement, and smoothing processing is performed on an inverse color image of a low-illumination image by adopting a first filtering coefficient and a second filtering coefficient, so that image contrast is enhanced while random noise is suppressed. Texture and noise level parameter of an image are calculated according to a local characteristic inside block of the image. Weighted averaging is performed on a first smoothing image and a second smoothing image after smoothing processing according to the texture and noise level parameters. The texture image is obtained by performing texture structure extraction on a gradient image of an inverse color image, and the texture image is combined with a weighted image to sharpen the weighted image, to have an effect of enhancing image details. Therefore, the contrast of low-illumination image can be effectively enhanced, various types of noise can be filtered, and the image color and details can be retained at the same time to obtain a clear and vivid restored image.
Owner:PEKING UNIV SHENZHEN GRADUATE SCHOOL

Pile foundation underpinning method for building foundation adjacent to deep foundation pit

ActiveCN104179204AMeet bending resistanceMeet punching resistanceFoundation repairArchitectural engineeringShear resistance
The invention relates to the technical field of civil engineering foundation reinforcing of industrial and civil construction projects, in particular to a pile foundation underpinning method for a building foundation adjacent to a deep foundation pit. The method includes the steps of firstly, investigating and designing, to be more specific, investigating the existing building, selecting foundation underpinning pile types according to building foundation size, buried depth, distance between the building foundation and the deep foundation pit and the depth of the deep foundation pit, calculating to determine the required length and number of foundation underpinning piles according to bearing capacity, allowing the foundation underpinning piles to exceed the depth of the bottom of the deep foundation pit, and completing ring beam design; secondly, pressing the piles at the edges of the building foundation; thirdly, performing pile foundation underpinning on the building foundation. The method has the advantages that the building foundation satisfies the requirements of bending resistance, punching resistance and shearing resistance by the aid of pile foundation underpinning, natural foundation bearing of the building foundation is changed into pile foundation bearing, additional load of the building foundation to the deep foundation pit is lowered greatly, sedimentation and horizontal displacement of the building foundation adjacent to the deep foundation pit are solved, and factory building safety is guaranteed.
Owner:山西钢铁建设(集团)有限公司

Mixed type cable-supported bridge

The invention relates to a mixed type cable-supported bridge. A main tower adopts a main tower form of a suspension bridge and a cable-stayed bridge; a main beam in a main midspan sling area adopts a steel box beam; a main beam in a stay cable area adopts a steel box beam, a steel-concrete combined beam or a concrete beam; and anchor spans at the two ends adopt pre-stress concrete main beams or other types of main beams. The main tower utilizes the main tower form of the suspension bridge or the cable-stayed bridge or the combination of the suspension bridge and the cable-stayed bridge according to needs of stress and landscape; a steel-concrete combined section is arranged between the steel box beam and the concrete beam; the steel box beam and the concrete beam are connected by steel strands, shear nails and the like to guarantee reliable and smooth force transmission; and the number of auxiliary piers in the edge span stay cable area can be changed according to the requirements of structural stress and rigidity. According to the mixed type cable-supported bridge, a self-anchored suspension bridge is combined with the cable-stayed bridge to take the advantages of the two types of bridges; the span of the formed bridge can reach 2500m; in addition, the mixed type bridge is large in spanning capability and does not need a large-scale concrete anchor, so that the bridge can be built in deep seas and other complicated environments; and the mixed type cable-supported bridge also can be applied to bridges with the span of hundreds of meters.
Owner:CHINA MAJOR BRIDGE ENERGINEERING
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