Image representation and compression using edge and gradient field
基于边缘和梯度场的图像表示和压缩方法

This paper presents a novel image representation and compression framework using edge and gradient fields. The original image was represented with the pixels in edge region and the gradient fields in non-edge region, and they were encoded separately. At the encoder side, the edge region map was encoded using an adaptive quadtree decomposition and 1D wavelet transform, and the gradient fields were encoded using standard 2D wavelet coder. At the decoder side, a gradient domain variation reconstruction method was utilized to restore the decoded image from the resulting edge region and gradient fields after inverse transform. The proposed framework can provide both lossless and lossy image compression in high compression rate, and can avoid the so-called ring phenomena near edges effectively.