(1. 中南大學(xué) 有色金屬成礦預(yù)測教育部重點實驗室，長沙 410083；
2. 中南大學(xué) 地球科學(xué)與信息物理學(xué)院，長沙 410083)
摘 要: 利用經(jīng)過差分的DGPS數(shù)據(jù)和IMU(Inertial measurement unit)獲取的外方位元素，經(jīng)過影像匹配產(chǎn)生的同名點，獲得同名點地理坐標(biāo)，使各個模型在此基礎(chǔ)上連接起來。經(jīng)過影像重采樣用地理坐標(biāo)代替像素坐標(biāo)，使拼接后的影像具有拍攝時的地理坐標(biāo)。實驗結(jié)果表明：平坦地區(qū)投影差較小，可以不進行投影誤差改正，直接利用左右影像同名像點進行影像拼接; 丘陵山區(qū)因為投影誤差的影響，影像拼接的誤差累積較快，此時應(yīng)采用分帶拼接，避免誤差積累。拼接后的影像坐標(biāo)與拼接精度達到了1׃2.5萬比例尺影像圖的精度。
關(guān)鍵字: UAV影像拼接；坐標(biāo)轉(zhuǎn)換；影像拼接誤差
（1. Key Laboratory of Metallogenic Prediction of Nonferrous Metals, Ministry of Education,
Central South University, Changsha 410083, China;
2. School of Geosciences and Info-Physics, Central South University, Changsha 410083, China）
Abstract:The geographic coordinates of each correspondence point on UAV’s (Unmanned aerial vehicles) image pairs are dete, rmined by the photogrammetric models of stereo image pairs and data of the DGPS/IMU (Differential GPS/Inertial measurement unit) after the correspondence points are correctly matched. The mosaic image is re-sampled and demonstrated with geographic coordinates instead of pixel coordinates. The experiments results show that the process of mosaic image can be directly adopted without projection correction with the situation of flat area. In wavy terrain, a set of UAV’s image is separated into several patches to mosaic UAV’s images because the projection error is big and results in error propagation impacts on estimation of geographic coordinate of a mosaic image. The accuracy and precision of geo-location of a mosaic image can be achieved as same as the image with scale of 1:25 000.
Key words: mosaic UAV’s images; coordinate transformation; image mosaic error
