So we use DSM for estimating the bottom elevation and plus the maximum possible height for roof elevation. Then the roof contour is transformed from the backward image to the forward image for epipolar resampling. At last, convolution processing is used to extract the standard deviation feature ...
The remaining parts that are in the weld area without defects are weld metal. The label color of weld metal is blue; If there is a long and thin weld defect within the weld area, it is defined as crack. The label color is green; ...