[ITK] CannyEdgeDetection

[灵魂安宁的寄托]

hello ,i want to ask some questions about the use of ITk.I am doing graduation project about the edge detection of color medical image.Firstly,I extrated the RGB components and gray 
components from the color image.Then,the canny algorithm is used to extract their edge respectively.Now,my problem is how to connect the four vice edge image.I hope to receive your 
reply soon.Thank you very much.
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