Pavement crack detecting device and method based on depth and gray level images

The invention discloses a pavement crack detecting device and method based on depth and gray level images. The pavement crack detecting device comprises a carrier platform (1), a camera shooting device (6), a line laser (7) and a calculating device (8), wherein the camera shooting device, the line laser and the calculating device are located on the carrier platform. The carrier platform (1) is used for moving in the pavement direction in the crack detecting process. The line laser (7) is used for emitting laser light perpendicular to a pavement while the carrier platform (1) moves. The camera shooting device (6) is used for continuously shooting laser lines, reflected by the pavement, of the linear laser light in a slant mode while the carrier platform (1) moves, imaging is conducted on a pavement fracture surface every time shooting is performed, and image data of the laser lines of a plurality of pavement fracture surfaces are generated. The calculating device (8) is used for generating depth data and gray level data of the corresponding pavement fracture surface according to the image data of the laser lines of each pavement fracture surface and splicing the depth data and the gray level data of each pavement fracture surface to form image data of a section of the pavement so as to conduct crack recognition.