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The grid structure of a chessboard naturally defines two sets of parallel lines in an image of it. Therefore, one expects that line detection algorithms should successfully detect these lines in practice. Indeed, the following figure demonstrates Hough transform-based line detection applied to a perspective-transformed [[:Image:Perspective chessboard.png|chessboard image]]. Clearly, the Hough transform is able to accurately detect the lines induced by the board squares.
{{multiple image
|title=Example: line detection
|align=center
|text_align=center
|total_width=
|width1=767|height1=548|image1=Perspective chessboard.png|caption1=Perspective-transformed chessboard image
|width2=767|height2=548|image2=Perspective chessboard edges.png|caption2=[[Canny edge detector]] applied to chessboard image
| |||