Method for positioning spacers of transmission lines by aid of video image processing technology

Abstract

The invention discloses a method for identifying and positioning spacers of transmission lines by the aid of a video image processing technology, and belongs to the technical field of digital video image processing and online monitoring for transmission lines. The method includes positioning target areas of images and positioning centers of the spacers by processes for normalizing the original images, acquiring direction fields, matching templates and the like; computing the direction fields of the images by a square-gradient algorithm when the target areas are positioned, and combining the direction fields with isotropic consistency information to position the target areas of the images corresponding to the transmission lines; and positioning the centers of the spacers by a histogram-based and normalized-correlation quick template matching algorithm. The quick template matching algorithm sets histogram matching joint threshold values and normalized-correlation matching maximum values as the foundation for judging the matching optimal positions, coordinates with the maximum probabilities in a plurality of matching results are selected to be used as center points of the spacers, and reference information is provided for monitoring conditions of the transmission lines and predicting faults.

Description

technical field [0001] The invention belongs to the technical field of digital video image processing and on-line monitoring of power transmission lines. In particular, it relates to a method for locating power transmission line spacers using video image processing technology, specifically the recognition and positioning of remote digital video images during on-line monitoring of power transmission lines, including the normalization and direction field of power transmission line spacer images. A series of image processing technologies such as extraction and template matching can automatically process and recognize the image of the spacer bar of the transmission line, and extract the position information of the spacer bar in the transmission line. Background technique [0002] The transmission line spacer is a supporting device between the split conductors, which keeps a certain distance between the sub-conductors of the split conductors. As one of the important equipment of...

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Problems solved by technology

Among them, Wai Ho Li et al. took the image of the transmission line taken by an ordinary camera from the side of the transmission line as the research object, regarded the transmission wire as a straight line and used the template matching method to locate it, combined with the spacer in the image and the bonding contact between the wires Gabor filter is used to realize spacer positioning. This algorithm can obtain ideal positioning results for images with small field of view and simple background, but the effect is not good when the sag of the transmission line is large and the background is complex.

Li Junfang and others proposed to take the video images taken by the camera installed on the tower as the research object, using the normalized correlation matching algorithm, combined with the pyramid layered search for the matching and positioning of the spacers, this method uses the full pixel normalized matching calculation , the algorithm is computationally intensive and time-consuming, resulting in poor timeliness of the matching algorithm

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