Bidimensional empirical mode decomposition and non-uniform sampling based ultrasonic images compression

In this paper, we propose an improved algorithm based on bidimensional empirical mode decomposition (BEMD) to compress the ultrasonic images. The algorithm uses morphological operators to identify the extrema of the image in the process of compression based on BEMD, and introduces variable sampling by different rates horizontally and vertically for overlapping blocks in the ultrasonic image. Furthermore, we propose the non-uniform sampling method for each single block considering the focalization of the extrema distribution. Finally, the performance of the proposed compression algorithm, using BEMD and non-uniform sampling, is demonstrated through the experiment conducted on an ultrasonic image.