现代电子技术
現代電子技術
현대전자기술
MODERN ELECTRONICS TECHNIQUE
2013年
14期
82-84,88
,共4页
图像配准%SIFT%仿射变换%配准系数%超大图像
圖像配準%SIFT%倣射變換%配準繫數%超大圖像
도상배준%SIFT%방사변환%배준계수%초대도상
image registration%SIFT%affine transformation%matching coefficient%oversized image
SIFT算法在仿射变换、噪声、一定程度的光照条件下具有良好的匹配性能,星上宽波段相机成像尺寸都非常大,超大尺寸图像直接利用SIFT算法,在构建高斯金字塔时空间占用大,同时导致计算用时长。通过研究仿射变换矩阵,提出可以通过计算超大尺寸图像的降采样图像之间的配准系数间接获取超大尺寸图像的配准系数的方法。经过实验验证,具有一定的可行性,对于图像配准从空间上减少计算量从而节约计算时间具有一定指导意义。
SIFT算法在倣射變換、譟聲、一定程度的光照條件下具有良好的匹配性能,星上寬波段相機成像呎吋都非常大,超大呎吋圖像直接利用SIFT算法,在構建高斯金字塔時空間佔用大,同時導緻計算用時長。通過研究倣射變換矩陣,提齣可以通過計算超大呎吋圖像的降採樣圖像之間的配準繫數間接穫取超大呎吋圖像的配準繫數的方法。經過實驗驗證,具有一定的可行性,對于圖像配準從空間上減少計算量從而節約計算時間具有一定指導意義。
SIFT산법재방사변환、조성、일정정도적광조조건하구유량호적필배성능,성상관파단상궤성상척촌도비상대,초대척촌도상직접이용SIFT산법,재구건고사금자탑시공간점용대,동시도치계산용시장。통과연구방사변환구진,제출가이통과계산초대척촌도상적강채양도상지간적배준계수간접획취초대척촌도상적배준계수적방법。경과실험험증,구유일정적가행성,대우도상배준종공간상감소계산량종이절약계산시간구유일정지도의의。
SIFT algorithm has a good matching performance under the conditions of affine transformation,noise and certain illumination. Since imaging size of the broadband camera on satellite is always oversized,if the oversized image is directly han?dled with SIFT algorithm,a big space will be occupied and a long computing time will be spended when building a Gaussian pyramid. By going into the affine transformation matrix,a method of calculating the matching coefficient between the downsam?ple images of oversized images to indirectly get the matching coefficient of the oversized images is proposed. The experimental re?sult indicates that this method is feasible. As for the image registration,it has a certain guiding significance for saving the com?putation time by reducing space occupation.