Visual detection method for slots on the surface of a bridge pier

Abstract

The invention relates to a visual detection method for slots on the surface of a bridge pier, which obtains a color image of the surface of the bridge pier through a linear array CCD camera. The colorimage is compressed and stored in blocks, and the color image is converted into gray-scale image, and the noise is reduced. Based on the linear characteristics of bridge pier slot, the image mask filter algorithm is used to enhance and smooth the gray image. the interval of the region A and the region B is calculated by the region distance method, In the region distance, the distance ratio between the region A and the region B is maximized by changing the parameter value, and the threshold value is used as the comprehensive segmentation threshold value of the pier slot image. The wavelet transform gradient image segmentation algorithm is used to detect the edge of the pier slot image. Finally, the edge detection method of multi-scale morphological image is used to extract the edge of thepier image, and the morphological watershed algorithm controlled by markers is used to identify the gap in the pier image, which can realize the efficient identification and detection of the pier gap.

Description

technical field [0001] The invention relates to image detection and recognition technology, in particular to a visual detection method for gaps on the surface of bridge piers. Background technique [0002] With the continuous development of society, the construction of bridge engineering in our country has also made great progress. However, due to the inadequacy of bridge design, construction period and future maintenance process, coupled with the influence of the natural environment and the service of bridge piers The length of time will cause damage to the pier structure gradually; the structural gaps on the surface of the pier will clearly reflect the damage of the pier. hidden dangers. [0003] Among many bridge pier diseases, bridge pier gap is a kind of damaged state that endangers the safety of bridge piers but is difficult to measure; at present, the detection of such diseases mostly stays in the manual operation stage, and the cracks are usually detected by close-r...

AI Technical Summary

Problems solved by technology

[0002] With the continuous development of society, the construction of bridge engineering in our country has also made great progress. However, due to the inadequacy of bridge design, construction period and future maintenance process, coupled with the influence of the natural environment and the service of bridge piers The length of time will cause damage to the pier structure gradually; the structural gaps on the surface of the pier will clearly reflect the damage of the pier. Hidden dangers

[0003] Among many bridge pier diseases, bridge pier gap is a kind of damaged state that endangers the safety of bridge piers but is difficult to measure; at present, the detection of such diseases mostly stays in the manual operation stage, and the cracks are usually detected by close-range detection instruments. After zooming in, the width is detected, and the length of the crack is obtained by inaccurate measurement or estimation. This method requires inspection personnel to use a road inspection vehicle or a frame, so the work intensity is high, the inspection cost is high, and the safety requirements for personnel are high. high

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