Patent ID: 9062958
Filing Date: 2015-06-23
Classification: G01B

Abstract:
1. A line image sensor including: a light receiving plane which comprises only two straight rows of pixels disposed at right angles to each other, said two straight rows of pixels capturing images of regular fringes generated from light reflected from an irradiated body as images of linear fringes which have bright parts alternated with dark parts in accordance with an amount of light received by each pixel of the two straight rows of pixels, signal read means for reading a signal determined by an amount of light received from each pixel in the two straight rows of pixels, signal processing means for calculating positions of the bright parts or the dark parts of the linear fringes from the read signal by the signal read means, said line image sensor detecting a change in attitude of the irradiated body in accordance with the images captured by the two straight rows of pixels, said light receiving plane acquiring images of linear fringes crossing at right angles in two directions among the regular fringe projected onto the light receiving plane, and said signal processing means including a connection processing portion for connecting bright parts together or dark parts together of the linear fringes in the two directions in accordance with a change in position of the bright parts or dark parts before and after a given period, in order to estimate a flat fringe image.