Apichontrakul S, Suwanweerakamtorn R. Rotation invariant binary gradient contour for geographic object-based image analysis. Asia Pac J Sci Technol [internet]. 2022 May 23 [cited 2026 Apr. 22];27(04):APST-27. available from: https://so01.tci-thaijo.org/index.php/APST/article/view/258257