Single Codestream Research Articles

Request redirection paradigm in medical image archive implementation

It is widely recognized that the JPEG2000 facilitates issues in medical imaging: storage, communication, sharing, remote access, interoperability, and presentation scalability. Therefore, JPEG2000 support was added to the DICOM standard Supplement 61. Two approaches to support JPEG2000 medical image are explicitly defined by the DICOM standard: replacing the DICOM image format with corresponding JPEG2000 codestream, or by the Pixel Data Provider service, DICOM supplement 106. The latest one supposes two-step retrieval of medical image: DICOM request and response from a DICOM server, and then JPIP request and response from a JPEG2000 server. We propose a novel strategy for transmission of scalable JPEG2000 images extracted from a single codestream over DICOM network using the DICOM Private Data Element without sacrificing system interoperability. It employs the request redirection paradigm: DICOM request and response from JPEG2000 server through DICOM server. The paper presents programming solution for implementation of request redirection paradigm in a DICOM transparent manner.

基于整型可逆时域交叠变换的遥感图像压缩

A reversible non-multiplying integer time domain lapped transform was introduced,and a new progressive lossy-to-lossless compression system was designed based on this transform technique.Completely lossless compression images and high-quality lossy reconstructed images could be obtained from a single code-stream using the proposed compression system.RTDLT improved the transform efficiency of DCT by adding pre-and-post-filters,and it couldrealize reversible integer transform by multi-lifting based on matrix factorization.Simulation results show that RTDLT-based compression system obtains comparable or even higher compression ratio in lossless compression than that of JPEG2000 and HD-Photo,better rate-distortion performance in lossy compression in most cases,and also gratify subjective visual quality.

Three-Dimensional SPIHT Coding of Volume Images with Random Access and Resolution Scalability

End users of large volume image datasets are often interested only in certain features that can be identified as quickly as possible. For hyperspectral data, these features could reside only in certain ranges of spectral bands and certain spatial areas of the target. The same holds true for volume medical images for a certain volume region of the subject's anatomy. High spatial resolution may be the ultimate requirement, but in many cases a lower resolution would suffice, especially when rapid acquisition and browsing are essential. This paper presents a major extension of the 3D-SPIHT (set partitioning in hierarchical trees) image compression algorithm that enables random access decoding of any specified region of the image volume at a given spatial resolution and given bit rate from a single codestream. Final spatial and spectral (or axial) resolutions are chosen independently. Because the image wavelet transform is encoded in tree blocks and the bit rates of these tree blocks are minimized through a rate-distortion optimization procedure, the various resolutions and qualities of the images can be extracted while reading a minimum amount of bits from the coded data. The attributes and efficiency of this 3D-SPIHT extension are demonstrated for several medical and hyperspectral images in comparison to the JPEG2000 Multicomponent algorithm.

JPEG2000 for Digital Cinema

JPEG2000 is the latest international standard for image compression. It combines state-of-the-art image compression performance with a rich feature set. JPEG2000 codestreams are highly scalable. Many different image products can be extracted from a JPEG2000 codestream without decompression. For instance, lower resolution and/or lower quality imagery may be extracted from a compressed codestream of higher resolution and/or higher quality. Digital Cinema Initiatives (DCI) has selected JPEG2000 for future distribution of motion pictures. This selection was based in part on the fact that JPEG2000 is an open international standard that can support both 2K and 4K resolution projectors from a single codestream. The JPEG2000 feature set is discussed, followed by a high-level description of the JPEG2000 algorithm.