利用调制传递函数滤波改进的高频调制影像融合

Improving High Frequency Modulation Image Fusion with Modulation Transfer Function Filters

提出利用调制传递函数滤波来改进高频调制影像融合,以提高GeoEye-1融合影像的空间分辨率,同时保持影像光谱特性.该方法首先由卫星影像测定调制传递函数,用这一传递函数对影像进行滤波退化,确定退化影像融合在最小均方误差下的高频调制影像融合权系数,进而用于非退化尺度下的融合,获得具有接近全色影像分辨率的多光谱融合影像.与Erdas软件的加权高通滤波融合法和MTF-GIF的比较表明:改进的高频调制影像融合方法生成的融合影像在保持光谱信息和提高多光谱影像分辨率上是最佳的.

A new high frequency modulation fusion method is proposed to improve spectral quality of GeoEye- 1 fusion image with high resolution.The modulation transfer function（MTF）used as a filter for degrading image is first measured from GeoEye-1 images.High frequency modulating parameters are then obtained based on the minimum mean square error criterion.Fused images obtained by using the proposed method have spatial resolution close to non-degraded pan images.Compared with fusion methods of weighted high-pass filtering used in ERDAS IMAGINE and MTF-GIF,the proposed method is the best in terms of preservation of spectral information and spatial resolution.