A Comparison Of Subjective Quality Indices Between Jpeg And Jpeg 2000 Compressed Cephalometric Images
Download A Comparison Of Subjective Quality Indices Between Jpeg And Jpeg 2000 Compressed Cephalometric Images PDF/ePub or read online books in Mobi eBooks. Click Download or Read Online button to get A Comparison Of Subjective Quality Indices Between Jpeg And Jpeg 2000 Compressed Cephalometric Images book now. This website allows unlimited access to, at the time of writing, more than 1.5 million titles, including hundreds of thousands of titles in various foreign languages.
A Comparison of Subjective Quality Indices Between JPEG and JPEG 2000 Compressed Cephalometric Images
The purpose of this study was to compare the effect of application of the JPEG 2000 standard to the previous standard of JPEG (1992) on image quality of digitized cephalometric images under various compression ratios. Seven digital cephalometric images were enhanced for optimal viewing and compressed with JPEG and JPEG 2000 at three levels of compression. TIFF images were preserved to measure intra-rater reliability. These images were shown to eleven orthodontic residents for assessment. The residents viewed the images and scored sixteen various cephalometric points of interest on a scale of 1-4. Kappa scores reflected that hard tissue, low contrast points had the least intra-rater reliability, while soft tissue points had the highest concordance. No difference was found in image quality between the original JPEG and the newer wavelet-based JPEG 2000 algorithm. A ratio of 4:1 compression showed no differences from the original TIFF images. Where differences were found, a 4:1 ratio showed superior image quality when compared to 27:1 or 40:1.
JPEG2000 Image Compression Fundamentals, Standards and Practice
Author: David Taubman
language: en
Publisher: Springer Science & Business Media
Release Date: 2001-11-30
This is nothing less than a totally essential reference for engineers and researchers in any field of work that involves the use of compressed imagery. Beginning with a thorough and up-to-date overview of the fundamentals of image compression, the authors move on to provide a complete description of the JPEG2000 standard. They then devote space to the implementation and exploitation of that standard. The final section describes other key image compression systems. This work has specific applications for those involved in the development of software and hardware solutions for multimedia, internet, and medical imaging applications.
JPEG2000 & JPEG for Telemedicine Applications
Author: Tick Hui Oh
language: en
Publisher: LAP Lambert Academic Publishing
Release Date: 2009
Due to the constrained bandwidth and storage capacity, medical images must be compressed before transmission and storage most of the time. However, the compression will reduce the image fidelity, especially when the image is compressed at low bit rate, which cannot be tolerated in medical field. In this book, the compression performance of the newer JPEG2000 and the conventional JPEG is compared. Image quality are measured both objectively and subjectively. Generally, there are two kind of compression - lossless and lossy. Here, the controversial lossy compression is used although lossless compression has always been preferred in telemedicine. The results presented in this book for the lossy compression have been quite promising. Four types of medical images are used in this study - X-ray, magnetic resonance imaging (MRI), ultrasound and computed tomography (CT). Overall, the study shows convincing results where by up to a certain degree without significant loss in image quality, lossy compression is acceptable from the medical perspective.