Masayuki Kurosaki

Error concealment using layer structure for JPEG2000 images

A method of error concealment for JPEG2000 images is proposed in this paper. The proposed method uses the layer structure that is a feature of JPEG2000. The most significant layer is hidden in the lowest layer of the JPEG2000 bit stream, and this embedded layer is used for error concealment. The most significant layer is duplicated because JPEG2000 uses bit-plane coding. In this coding, when the upper layers are affected by errors, the coefficients of the lower layers become meaningless. A bit stream encoded using the proposed method has the same data structure as a standard JPEG2000. Therefore, it can be decoded by a standard decoder. Our simulation results demonstrated the effectiveness of the proposed method.

Error correction using data hiding technique for JPEG2000 images

A method of error correction for JPEG2000 images is proposed in this paper. The method uses the layer structure that is a feature of the JPEG2000 and an error correction code. The upper layers of the code stream are coded using an error correcting code, and the parity data are hidden in the lowest layer. The hidden data are used for error correction at the decoder. Several error correction codes with different strength are selected for the main header, packet headers, and bodies. Since the resulting code stream has the same data structure as a standard JPEG2000 code stream, it can be decoded with a general decoder. Simulation results demonstrated the effectiveness of the proposed method.

Error protection for JPEG2000 encoded images and its evaluation over OFDM channel

In this paper, we propose a new error protection technique for JPEG2000 encoded images that exploits the codestream layer structure. Prior to transmission, data in the top layer are duplicated and protected by an FEC code. The data are then embedded into the bottom layer. In the receiver, a post-transmission process is applied to the codestream that extracts the embedded data for error recovery purposes. Our proposal offers several advantages: it preserves the same codestream structure as the one in the JPEG2000 part I standard, provides multilevel error protection for the top layer, and can be merged with the existing error resilience technique. Hence, the method accommodates the new requirements for wireless JPEG2000 (JPWL/JPEG2000 part 11). Simulations in an OFDM transmission environment show the effectiveness of the proposed method.

A robust error protection technique for JPEG2000 codestream and its evaluation in CDMA environment

In this paper, a robust error protection scheme for JPEG2000 codestream is proposed. The error protection is achieved by combining the advantage of the codestream layer structure, a data hiding technique and an FEC code. At encoding stage, multiple quality layers of the codestream are protected by an FEC code with various strengths. The parity data is then hidden in the least significant layer. Prior to image decoding, error recovery is done by means of extracting the hidden data and performing the FEC decoding to the corresponding layers. The proposed method offers several benefits: it preserves the same codestream structure as the one in the JPEG2000 standard part 1, does not require additional bandwidth and can be integrated with the existing JPEG2000 error resilience tools. Hence, it accommodates one of the requirements for the upcoming wireless JPEG2000 (JPWL or JPEG2000 part 11). Simulations in a CDMA environment confirmed the proposals effectiveness.

Packet loss recovery for RTP-based transmission of JPEG2000 images enabling backward compatibility with standard decoder

This paper deals with a packet loss recovery technique that enables backward compatibility with a standard decoder for transmission of JPEG2000 images over the Internet using RTP. The proposed scheme utilizes packet-level FEC, the JPEG2000 layered structure, and a data embedding technique. Prior to transmission, packets containing some portions of compressed data that related to a predetermined compression rate (bits/pixels) or acceptable image quality, are strongly protected using FEC across packets. At the receiver, the redundant packets are utilized to reconstruct any lost packets of the protected data. With a slight modification in the SOT marker segment of the codestream and careful placement of the redundant packets, the generated codestream is complaint with the standard decoder. Simulations using RTP in an IP network transmission confirmed the proposals effectiveness.

Efficient packet loss protection for JPEG2000 images enabling backward compatibility with a standard decoder

This paper proposes an efficient packet loss protection strategy for transmission of JPEG2000 coded images over a packet erasure channel that backwardly compatible with the JPEG2000 part-1 decoder. The proposed scheme utilizes FEC at packet-level, the JPEG2000 layered structure and its error resilient functionalities. Prior to transmission, packets containing initial layers of the code-stream, which is associated lo a minimum acceptable image quality, are protected using a packet-level FEC. With a slight modification in the SOT marker segment and careful placement of the redundant packets, the generated codestream that carried redundant data is compliant with a standard decoder.

Packet analyzer for JPEG2000 codestreams and its VHDL model

In this paper, a packet analyzer for JPEG2000 codestreams is designed and its switching power and cell areas are estimated. This analyzer is intended to treat packets in the PEG2000 codestream, where the packet header and body data are separated from each other for further processing, such as encryption, partial scrambling, data hiding, and error correction. This VHDL-modeled analyzer can work at a bit rate of 50 Mb/s at minimum cost. Thus, it is suitable for real-time applications.