An Adaptive Irregular Sampling Method for Progressive Transmission

An adaptive nonuniform sampling technique for alias-free image representation is presented. It is both fast, thanks to the use of pseudo-Poisson disks (PPDs), and eeective, because a higher sample density is used in areas which are rich in details; these zones of the image are located using a skewness-based operator, which is both simple and accurate, and gradient information. Experimental results on real-world images are presented , which show that this technique provides images free of aliasing and with good detail content. As an example of application, a progressive image coding scheme based on the proposed technique is also presented .