Abstract
MCJ2K (Motion-Compensated JPEG2000) is a video codec based on MCTF (Motion- Compensated Temporal Filtering) and J2K (JPEG2000). MCTF analyzes a sequence of images, generating a collection of temporal sub-bands, which are compressed with J2K. The R/D (Rate-Distortion) performance in MCJ2K is better than the MJ2K (Motion JPEG2000) extension, especially if there is a high level of temporal redundancy. MCJ2K codestreams can be served by standard JPIP (J2K Interactive Protocol) servers, thanks to the use of only J2K standard file formats. In bandwidth-constrained scenarios, an important issue in MCJ2K is determining the amount of data of each temporal sub-band that must be transmitted to maximize the quality of the reconstructions at the client side. To solve this problem, we have proposed two rate-allocation algorithms which provide reconstructions that are progressive in quality. The first, OSLA (Optimized Sub-band Layers Allocation), determines the best progression of quality layers, but is computationally expensive. The second, ESLA (Estimated-Slope sub-band Layers Allocation), is sub-optimal in most cases, but much faster and more convenient for real-time streaming scenarios. An experimental comparison shows that even when a straightforward motion compensation scheme is used, the R/D performance of MCJ2K competitive is compared not only to MJ2K, but also with respect to other standard scalable video codecs.
Highlights
The JPEG2000 (J2K) standard [1] is a still-image codec which encompasses the compression of sequences of images that goes by the name Motion J2K (MJ2K)
This work presents MCJ2K, a straightforward extension (JPIP compatible) of the MJ2K standard that can be used to exploit the temporal redundancy of the sequences of images
The compression ratio obtained by MCJ2K is superior to MJ2K if enough time redundancy can be exploited in the MCTF stage
Summary
The JPEG2000 (J2K) standard [1] is a still-image codec which encompasses the compression of sequences of images that goes by the name Motion J2K (MJ2K). Interactive Protocol (JPIP) [2] to transmit J2K codestreams between client/server systems, offering a high degree of scalability (spatial, temporal and quality). MCTF is a transform that inputs a sequence of images and outputs a sequence of MCTF-coefficients (which will be called coefs), grouped in a collection of temporal sub-bands These coefs are compressed with J2K, resulting in a collection of J2K codestreams that can be transmitted using JPIP.
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