In this paper we investigate the possibility of improving the overall perception of image quality by preferentially coding certain regions of interest (ROI) in an image. Experiments are conducted utilising an automated algorithm for visual attention (VA) to detect the primary ROI(s) in an image, and then encoding the image using the maxshift algorithm of JPEG 2000. The results from a 2 alternat...

In modern medical communication systems, the high-efficiency video compression technology is of great significance to the storage and transmission of digital medical videos. To further improve the compression performance of the medical ultrasound videos, two innovative technologies based on diagnostic region-of-interest (ROI) extraction with the High Efficiency Video Coding (H.265/HEVC) standar...

Region of interest (ROI) coding is one of the innovative functionalities supported by JPEG2000. It enables a non-uniform distribution of the available bit budget (i.e. image quality) between a selected region (ROI) and the rest of the image (background). This is achieved by appropriate scaling of the background wavelet coefficients. Two different methods are used for ROI coding, the MAXSHIFT me...

Region of interest (ROI) image and video compression techniques have been widely used in visual communication applications in an effort to deliver good quality images and videos at limited bandwidths. Most image quality metrics have been developed for uniform resolution images. These metrics are not appropriate for the assessment of ROI coded images, where space-variant resolution is necessary....

A new effective mechanism is proposed for the browsing of large compressed images over the Internet. The image is compressed with the JPEG 2000 into one single bitstream and put on the server. During the browsing process, the user specifies a region of interest (ROI) with certain spatial and resolution constraint. The browser only downloads the portion of the compressed bitstream that covers th...

This paper introduces a novel algorithm to compute equivalent latitude by applying regions of interest (ROI). The technique is illustrated using code written in Interactive Data Language (IDL). The ROI method is compared with the "piecewise-constant" method, the approach commonly used in atmospheric sciences, using global fields of atmospheric potential vorticity. The ROI method is considerably...

INTRODUCTION Measurement of myocardial blood flow (MBF) with DCE-MRI is conventionally performed on a region-of-interest (ROI) basis: time curves are averaged over a ROI, and tracer kinetic analysis is applied to the ROI curve to derive the MBF [1, 2]. In principle, a voxelwise analysis is more attractive since it produces higher resolution images of MBF and may thus increase the diagnostic pow...

En este trabajo se desarrolla una revisión de literatura del tema retorno la inversión en medios sociales (social media ROI). Fueron revisados artículos que su mayoría corresponden a los Top Journals marketing enfocándose, principalmente, últimos diez años las bases datos ISI Web of Science y Scopus. Como resultado esta búsqueda, logra dar cuenta estado actual lo propone respecto la­ estimación...