传输图像的子波域插值恢复算法

An Approach of Wavelet Domain Interpolation for Image Reconstruction in Transmission

在丢包信道中传输子波编码图像时 ,存在图像重构问题 .本文提出了一种新的图像恢复算法—树恢复子波域插值算法 ,可以用于恢复丢失的子波树系数 .该算法利用二维子波变换具有的水平和垂直方向边缘检测能力 ,采用数学形态学膨胀运算 ,恢复已丢失的表示边缘信息的高频系数 .为了保持图像边缘的尖锐性和方向性 ,本文采用了高频系数指导下的低频系数恢复技术 .

Transmission of wavelet coded images over lossy packet networks presents an image reconstruction problem.A new image reconstruction algorithm called Wavelet Domain Interpolation for tree Reconstruction (WDIR) to conceal coefficients loss in Wavelet Trees is developed.The reconstruction of the lost high frequency coefficients is given by using mathematical morphological dilation operator based on the horizontal and vertical edge detection ability of 2 D wavelet transform.To maintain the sharpness of edges,we reconstruct the lost low frequency coefficients under the direction of high frequency coefficients.The algorithm performs well in performance simulations.