A vision guidance measuring method is proposed to solve problem of time consuming in scanning process of laser range finders. On the basis of obtaining object edges

use improved advancing front technique（ AFT）

by calculating coefficient of distance between detected nodes and inside and outside boundaries

so as to control density of overall mesh and acquire triangular mesh which adapt to geometry structure of target. The nodes corrdinate of the triangular mesh are regarded as measurement points on laser vision guide by high precision stepping motor control

laser triangular sensor to move to designated coordinate

and depth data is acquired

finally

the target is reconstructed. Experimental results indicate that this method avoid the process of point to point scanning

increases measuring efficiency by at least 40 %. This method satisfies the system requirements of fast measuring and precise reconstruction with a good result.