Hexagon Geospatial
MENU

ERDAS IMAGINE Q&A

ERDAS IMAGINE, the world’s leading geospatial data authoring system, supplies tools for all your Remote Sensing and Photogrammetry needs.
Showing results for 
Search instead for 
Do you mean 

Disparity Difference setting in Tridicon and XPro Semi-Global Matching (SGM)

by YaseminS. on ‎01-11-2017 05:05 PM (605 Views)

Question

What does the Disparity Difference setting do in Semi-Global Matching? What is the effect of raising or lowering the Disparity Difference in Tridicon and XPro Semi-Global Matching (SGM)?

Answer

The Disparity Difference is a threshold for removing blunders when doing reverse matching. Left-Right matching is done first and then Right-Left matching is performed. The difference in pixels is the measure of disparity and this is given in pixels. The default value of 1 means a difference of 1 pixel is allowed. Increasing the disparity threshold to 2 or 3 means there will be more points but it also increases the likelihood of having suspect points. Decreasing the disparity threshold to 0 means no difference is allowed and it is harder to find matches (not recommended).

 

Contributors