An embodiment of the present invention is related to an elongation detection device, detection device is elongated by providing one, using in a contactless manner.It can detecte a video camera of the elongation of a theme from a distance in this end To, the technical failure being solved is, the present invention relates to a video camera, is used in a height be that a theme is taken pictures in addition to ground One angle adjusting unit is used for one jiao towards the one side adjustment video camera of theme One range sensor is used to detect a distance to theme One control section, is used to calculate the elongation of theme, uses the height of video camera, the angle of video camera and distance.
