MI Zeng-zhen, XIE Zhi-jiang, CHEN Tao, CHU Hong-yu, FAN Bing. Key technology of image enhancement and edge extraction for heavy rail[J]. Editorial Office of Optics and Precision Engineering, 2012,20(7): 1645-1652
MI Zeng-zhen, XIE Zhi-jiang, CHEN Tao, CHU Hong-yu, FAN Bing. Key technology of image enhancement and edge extraction for heavy rail[J]. Editorial Office of Optics and Precision Engineering, 2012,20(7): 1645-1652 DOI: 10.3788/OPE.20122007.1645.
Key technology of image enhancement and edge extraction for heavy rail
As the two edge pixels of a heavy rail image is not identical
the classical edge operators are difficult to achieve the edge extraction and segmentation. Therefore
this paper proposed a new algorithm to enhance and extract images. A strong contrast stretching algorithm was used to stretch the rail surface and the background differently
enhance the edge information and weaken the background information. Then
the maximum variance method was taken to select the optimal threshold to implement the binarilization. Finally
the recursion connected domain marker algorithm was used to locate the pixel coordinates of edge to achieve the image segmentation. 30 images were chosen to a discretion experiment
and results indicate that the gray features of image edge are enhanced clearly
surface textures and false edges are restrained availably. Moreover
the pixel width fluctuating range is reduced from -0.64% to 0.34%. With the discrete pretreatment algorithm via addressing global array of a register
the segmentation time has been decreased to 10.165 s. The algorithm is better than the classical edge operators in the precision
correctness and the timeliness and is more suitable for on-line detection systems.
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references
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