黃梅++唐琨++肖建新



摘 要 以制作全景圖為例將圖像拼接技術應用到制作動漫貼圖上,簡化動漫貼圖的制作.使用手持相機采集一定重疊區域的圖像,柱面投影后采用基于尺度空間的Harris算法檢測圖像特征點,雙向歸一化互相關算法匹配特征點,迭代提取閾值T的算法去除誤匹配.通過改進的RANSAC算法快速估算出變換參數模型,對拼接圖像進行投影變換.Szeliski灰度融合方法,直接計算匹配點灰度平均值融合圖像,最后采用最佳縫合線的方法消除圖像拼接處的重影.基于Matlab的數據實驗表明,提出的圖像拼接技術具有效率高,拼接圖像清晰等優點,實現了較滿意的全景圖視覺效果.
關鍵詞 動漫貼圖;虛擬漫游;圖像拼接技術
中圖分類號 TN91173 文獻標識碼 A 文章編號 10002537(2016)01004906
Application of Image Mosaic Based on Feature Point in the Animation
HUANG Mei, TANG Kun, XIAO Jianxin*
(Educational Technology Center, Changsha Normal College, Changsha 410100, China)
Abstract To simplify the steps of the animation production,the image mosaic technology is applied to the animation production with panorama as an example, and some images of the overlapping area with the cemera were collected. After the cylindrical projection, the Harris algorithm was used to detect the feature points of the images in the scale space. And the double direction of normalized cross correlation in featurepoint matching was adopted. The threshold T was extracted repeatly to remove the mismatch feature points. And the project model was estimated with the improved RANSAC algorithm. A method of gray adusting to image fusion, and the beat seamline is introduced to eliminate image ghosting. The data experiments based on Matlab showed that the image mosaic technology could effectively mosaic image and achieve a satisfactory visual panorama.
Key words animation map; virtual touring; image mosaic technology
圖像拼接技術是虛擬現實、計算機圖形學和圖像處理等領域的重要研究課題.在動畫領域,用于制作動畫模型貼圖,節省成本,提高制作模型貼圖的速度和精度[1].在TIP(tour into the picture畫中游)領域,生成全景圖像,為二維的靜止圖像中產生動態三維圖像提供重要基礎[2].
圖像拼接技術是將數張相鄰有重疊區域的圖像或照片經過配準、圖像融合后拼接形成一張360度視角或寬視角的全景圖像.圖拼接算法主要集中在基于區域相關和基于特征的方法,基于區域相關的方法通過圖像的相似程度確定方差函數,通過函數確定圖像間的變換關系,該方法要求圖像間的變換幅度小,且該方法容易受到關照條件等的影響,計算機量大;……