Arthan, Nalinnipa, and Chaiyaporn Panyindee. 2026. “Removal of Periodic Noise in Digital Images Using an Improved Notch Filter”. NKRAFA JOURNAL OF SCIENCE AND TECHNOLOGY 22 (1):83-100. https://ph02.tci-thaijo.org/index.php/nkrafa-sct/article/view/260219.