Rotation angle correction method, device of rotary mirror, and scanning method and system

A scanning method, applied to an optical scanning device, wherein the optical scanning device is based on line laser irradiated onto a rotating multi-faceted reflector and then reflected to a scanned target so as to generate structured light, and the scanning method comprises the following steps:

• based on corrected coordinate information of the structured light, generating structure information of to-be-cast structured light;
• based on the structure information, performing structured light casting;
• during the structured light casting process, collecting image information of a scanned target irradiated by the structured light;
• and
• based on the image information, performing three-dimensional reconstruction on the scanned target;
• the coordinate information of the structured light is corrected based on the following steps:
• obtaining a plurality of light stripe images cast to a reference target screen under different graduations and corresponding rotation graduation information;
• based on the light stripe images and corresponding rotation graduation information, obtaining a first mapping relationship;
• and
• based on the first mapping relationship and the rotation graduation information, correcting the coordinate information of the structured light.

A rotation angle correction device of a rotary mirror, applied to an optical scanning device, wherein the optical scanning device is based on line laser irradiated onto a rotating multi-faceted reflector and then reflected to a scanned target so as to generate structured light, and the correction device comprises the following modules:

• an obtaining module, configured to obtain a plurality of light stripe images cast to a reference target screen under different graduations and corresponding rotation graduation information;
• a mapping module, configured to, based on the light stripe images and corresponding rotation graduation information, obtain a first mapping relationship;
• and
• a correcting module, configured to, based on the first mapping relationship and the rotation graduation information, correct coordinate information of the structured light.