小波双三次插值搜索算法提高遥感图像分辨力

通过小波双三次插值中高频外推阈值门限选取与峰值信噪比变化关系的分析,提出了小波双三次插值搜索算法。该算法能够自动搜索到高频外推的最佳阈值门限,在不破坏光学遥感图像原始信息的情况下,提高图像的空间分辨力和峰值信噪比,有利于对图像的细节信息进行观察分析。实验表明,该算法的重建图像的峰值信噪比比全小波插值图像和小波双线性插值图像的峰值信噪比分别高6.5dB和2.4dB,熵提高到原图像的1.3倍,是一种提高光学遥感图像分辨力的有效算法。

Improvement of the resolution of the optical remote sensing image by the wavelet bi-cubic interpolation searching algorithm

Through analysis of the changing relationship between the threshold of high-frequency extrapolation in the Wavelet Bi-cubic Interpolation Algorithm and its correspondent Peak Signal-to-Noise Ratio (PSNR), a Wavelet Bi-cubic Interpolation Search Algorithm is proposed. The algorithm can automatically search the optimal extrapolation threshold to improve resolution and PSNR of the remote sensing image without damaging image information, which makes more favorable to observe and analyze. The experiment results prove that the PSNR of the image reconstructed by the algorithm is 6.5 dB and 2.4dB bigger than that the images reconstructed by scale-function interpolation and wavelet bi-linear interpolation respectively, and its entropy is up to 1.3 times of its original image. It is an effect algorithm to improve the spatial resolution of Optical Remote Sensing Image.