초록 ▼

A rangefinder performs highly accurate 3D measurement without being affected by any variation in intensity of projected light. A light source for projecting light onto an object is provided with a light receiver for detecting the intensity of the projected light. The intensity of a reflected part of

A rangefinder performs highly accurate 3D measurement without being affected by any variation in intensity of projected light. A light source for projecting light onto an object is provided with a light receiver for detecting the intensity of the projected light. The intensity of a reflected part of the projected light, which has been captured by a camera as an image, is corrected using the light intensity, which has been detected by the light receiver, as correction information. And based on this corrected image, a distance calculator produces a range image. Thus, even if the intensity of the projected light has changed, a corresponding variation in intensity of the reflected light image can be compensated for.

대표청구항 ▼

1. A rangefinder comprising:a light source for projecting a set of light patterns onto an object, an intensity ratio of the projected light patterns being monotonously increasing or decreasing on the object at least from place to place; a camera for capturing a pair of images of the object by using

1. A rangefinder comprising:a light source for projecting a set of light patterns onto an object, an intensity ratio of the projected light patterns being monotonously increasing or decreasing on the object at least from place to place; a camera for capturing a pair of images of the object by using parts of the projected light patterns, the parts having been reflected from the object; and a three-dimensional information generator for generating three-dimensional information of the object from the reflected light images captured by the camera, wherein the three-dimensional information generator includes a light intensity corrector, which corrects intensities of the reflected light images according to correction information representing intensities of the projected light patterns, and generates the three-dimensional using a pair of images that have been by the light intensity corrector.