On-line imaging detection device and method for cylindrical internal and external wall machining accuracy

The present invention belongs to based line detection system of vision, and particularly to the cylindrical outer wall precision machining line imaging detector means with an online imaging testing, comprising a laser (2), the mirror (3), the optical path conversion mirror (4), the image reception process section (5); a laser through the laser mirror (2) issued (3) after reflection, projected onto the inner wall of the cylindrical surface to be measured; the optical path conversion mirror (4) and capture the diffuse reflection light spot converged onto the image receiving process processing portion; wherein the imaging line detection method comprising: an image acquisition part, an image pre-processing section, extracting the central spot portion, an inner wall distance calculating portion; the image pickup section reads the digitized image from the diffusely reflected light spot; part of the image pre the acquired image information is processed; extracting geometrical center of gravity of the spot center spot determining section; an inner wall portion of the distance calculating coordinates to the spot from an inner wall.