遥感图像的DCT域处理方法研究

Research of remote sensing image processing in the DCT domain

目的在压缩域进行遥感数据处理,以简化运算,减少运算量,提高运算速度。方法通过离散余弦变换(DCT)实现遥感图像在空间域和压缩域间的变换,结合实例用两种滤波器对遥感图像在压缩域进行了处理。结果通过离散余弦变换,图像由空间域变到了DCT域,在DCT域用指数低通滤波器去噪,高通滤波器提取地面特征边缘信息。结论在压缩域进行遥感图像处理,不但可简化运算,减少运算量,而且可使处理速度大大提高。

Aim To simplize operation, decrease expenses of calculation and improve processing speed. Remote sensing image is processed at compressing field. Methods Remote sensing image is transformed between spatial filed and compressing one by DCT. The test data is processed with two kinds of filter. Results At compressing field noise restrain and edge extraction are realized. Conclusion It indicates that not only simpler operation and smaller calculation are obtained but also the processing speed is improved greatly.