Medical image compression based on region of interest using better portable graphics (BPG)

Abstract

Everyday, an enormous number of medical images are produced by hospitals and medical imaging center for research, surgical and disease diagnostics. Therefore, compression is necessary for storing, managing and transferring these data to make storage manageable. Medical images have some parts which are more important called region of interest (ROI) with useful information for the diagnostic purpose that should be reconstructed with high quality during the image decompression process. In this paper, a state-of-the-art image compression format known as Better Portable Graphics (BPG), which is based on the High Efficiency Video Coding (HEVC), is used for medical image compression. In the proposed compression method, first the medical image is segmented into two parts: ROI and non-ROI regions. In the next step, lossless BPG compression algorithm is applied to the ROI areas, and lossy BPG is utilized for non-ROI regions. In the end, the resulting reconstructed images are combined to create a complete compressed image. The MRI scan dataset hosted by the University of Cyprus is used to evaluate the performance of the proposed compression method to demonstrate improvement between 10-25% in the compression rate compared to traditional image compression techniques used in the medical industry.

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