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针对影像数据降采样预处理对SIFT特征匹配数量和精度的影响进行试验分析,并对在相同采样频率下不同插值方法导致特征匹配数量与精度的差异进行详述,提出在满足影像分辨率要求的前提下,使用三次卷积内插方法进行80%～90%的降采样预处理,可以获得最大的特征匹配数量且满足匹配精度,而所需要的时间开销则减少20%～30%,具有重要的应用价值。
Aiming at the effect of down-sampling preprocessing of image data on the number and accuracy of SIFT feature matching, the difference between the number and accuracy of feature matching caused by different interpolation methods under the same sampling frequency is described in detail. In order to meet the requirement of image resolution Under the precondition, using the cubic convolution interpolation method, 80% ~ 90% down-sampling preprocessing can obtain the maximum number of feature matching and meet the matching accuracy, while the required time overhead is reduced by 20% ~ 30%, which is important The application value.