Knipe J, Li X
PrePrint Inc., Edmonton, Alta., Canada.
IEEE Trans Image Process. 1998;7(12):1653-60. doi: 10.1109/83.730377.
Image compression schemes consist of compression and decompression phases. Often, the decompression phase includes mechanisms for improving the quality of the resulting image. Quadtree compression is one such type of compression. Reconstructed quadtree images can be blocky because of the nature of the compression method, unless additional processing, generally smoothing, is performed. We propose improvements over the reconstruction method described by Shusterman and Feder. The improvements consist of the introduction of a simpler and more effective 2 x 2 reconstruction filter to replace the suggested 3 x 3 filter, and the addition of a reconstruction threshold to preserve image edges. This method is compared experimentally to the original algorithm and also to JPEG compression in terms of complexity and resulting image quality.
图像压缩方案由压缩和解压缩阶段组成。通常，解压缩阶段包括用于提高所得图像质量的机制。四叉树压缩就是这样一种压缩类型。由于压缩方法的性质，重建的四叉树图像可能会有块状感，除非进行额外的处理，通常是平滑处理。我们对舒斯特曼和费德描述的重建方法提出了改进。改进之处包括引入一个更简单、更有效的2×2重建滤波器来取代建议的3×3滤波器，以及添加一个重建阈值以保留图像边缘。在复杂度和所得图像质量方面，将该方法与原始算法以及JPEG压缩进行了实验比较。
