Applications of second moments for image process

• Main Authors: Shang-WenChien, 簡上文
• Other Authors: Shih-Yu Shen
• Format: Others
• Language: zh-TW
• Published: 2018
• Online Access: http://ndltd.ncl.edu.tw/handle/3ey7g4

碩士 === 國立成功大學 === 數學系應用數學碩博士班 === 106 === In the past, matching errors may occur to the simplest template matching due to changes in the picture. Additionally, it is time consuming. Therefore, we apply second moment to carry out image matching, which not only considerably reduces the calculation but also is noticeably faster than before. First, I_x , I_y and I_xy are calculated with the application of second moment. Then, these three values are used to find the zoom ratio and rotation angle of the two photos to be compared. Next, zoom and rotate one of the photos, calculate the center of gravity of the two photos, translate and overlap the center of gravity, and then directly subtract the photos to distinguish the similarities between the two photos. Experimental results can accurately calculate the difference angle and zoom ratio, so that the comparisons will be more precise.