Due to the complex environmental background of the substation, the wide field of view of drone inspection, and the small proportion of the target in the image, it is difficult to extract the defect feature of the small target and the high false detection rate. How to improve the recognition rate of the defect of the small target equipment is an urgent problem to be solved at present. The multimodel cascaded module, which is used to locate device components before defect detection or defect classification, is introduced into the Cascade-Rcnn algorithm to improve the accuracy of defects of small target device components and achieve accurate location of device defects.
Histogram specification is a useful algorithm of image enhancement field. This paper proposes an image haze
removal algorithm of histogram specification based on the weighted Gaussian probability density function (Gaussian
PDF). Firstly, we consider the characteristics of image histogram that captured when sunny, fogging and haze weather.
Then, we solve the weak intensity of image specification through changing the variance and weighted Gaussian PDF.
The performance of the algorithm could removal the effective of fog and experimental results show the superiority of the
proposed algorithm compared with histogram specification. It also has much advantage in respect of low computational
complexity, high efficiency, no manual intervention.
This paper concerns the method for checking the status of isolators and is applied in the sequence control in smart substation based on SmartGuard--a mobile inspection robot for substations. It can recognize the status of an isolator through analyzing its feature. We could get the homography matrix by using the SIFT feature between the template image and new acquired image, then get the range of isolator, finally recognize the status of isolator by image processing. The experiment of results proved that the method could recognize isolator status effectively. The substation realizes one key sequence control system through this technology based SmartGuard.
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