An iterative postprocessing algorithm is proposed in the paper to reduce the coding artifacts produced by block based motion compensated transform coding. In the proposed approach, the adaptive spatial operations foll...
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ISBN:
(纸本)0818669527
An iterative postprocessing algorithm is proposed in the paper to reduce the coding artifacts produced by block based motion compensated transform coding. In the proposed approach, the adaptive spatial operations followed by the adaptive motion compensated temporal operation are applied to the reconstructed image iteratively. As both the spatial and the temporal operations are adaptive to the image contents in both the spatial and the temporal domain, iteratively applying those operations to the reconstructed image can greatly reduce the coding artifacts without blurring image details. The computer simulations show that by using the proposed algorithm, one can reduce the coding artifacts and improve the quality of the reconstructed image effectively.
The byte error locating codes specify the byte location in which errors are occurred without indicating the precise location of erroneous bit positions. This type of codes is considered to be useful for fault isolatio...
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The byte error locating codes specify the byte location in which errors are occurred without indicating the precise location of erroneous bit positions. This type of codes is considered to be useful for fault isolation and reconfiguration in the fault-tolerant computer systems. In this paper, difference between the code function of error-location and that of error-correction/error-detection is clarified. With using the concepts of unidirectional byte distance, unordered byte number and ordered byte number, the necessary and sufficient conditions of the unidirectional byte error locating codes are demonstrated.
Recently, a lot of research works have been carried out regarding intelligent communication. If the final information sink is assumed as a human being, a communication channel can be used more effectively when encoder...
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Recently, a lot of research works have been carried out regarding intelligent communication. If the final information sink is assumed as a human being, a communication channel can be used more effectively when encoders/decoders work ''intelligently'' or take into account of the semantics of information to be sent. We have been studying error-controlling systems based on different importance of segmental information. The system divides the information input into segments to which individual importance can be assigned. The segments are individually encoded by appropriate error-correcting codes (ECCs) which correspond to their importance among codes with different error-correcting capabilities. For the information that difference of the importance is systematically aligned, conventional UEP (unequal error protection) codes can be applied, but we treat the case that alignment of the importance of the information source is not systematically aligned. Since the system uses multiple ECCs with different (n,k,d) parameters, information regarding what length of the next codeword is required for decoding. We propose error controlling schemes using multiple ECCs;the first scheme and the second scheme use the obvious codelength identifying information. In the second scheme, information bits are sorted so that segments with the same importance can be encoded by an ECC with the same error-correcting capability. The third scheme is a main proposal in this paper and uses Variable Capability coding scheme (VCC) which uses some ECCs having different error-correcting capabilities and codelengths. A sequence encoded by the VCC is separable into appropriate segments without obvious codelength identifying information when the channel error probability is low. Subsequently, we evaluate these schemes by coderate when (1) error correcting capability (2) codelength identifying capability are the same. One of the feature of VCC is the capability of resuming from propagative errors because erro
Bose-Chaudhuri-Hocquenghem (BCH) and Reed-Solomon (RS) are two powerful approaches to error-control coding that ensure error-free data communications. These two codes which maximize error correctability can be decoded...
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Bose-Chaudhuri-Hocquenghem (BCH) and Reed-Solomon (RS) are two powerful approaches to error-control coding that ensure error-free data communications. These two codes which maximize error correctability can be decoded by using the Massey-Berlekamp algorithm. Even though these codes have just been recently realized as far as application in high-speed digital transmission is concerned due to complex decoding involved, they undoubtedly would be useful as a building block for the construction of error-resilient and safe file systems.
This paper considers Action Unit (AU) as a segment of model-based coded facial image of human being and define the importance for each AU. According to the importance, an AU is encoded by an appropriated code among co...
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This paper considers Action Unit (AU) as a segment of model-based coded facial image of human being and define the importance for each AU. According to the importance, an AU is encoded by an appropriated code among codes with different error-correcting capabilities. For encoding with different error controlling codes, three kinds of constructions to obtain unequal error protection (UEP codes are described in this paper. One of them is direct sum construction and the others are the proposed construction which are based on joint and double coding. By using these UEP codes, the proposed intelligent error-controlling scheme can protect information in segment in order to reduce semantic errors over a conventional error-controlling scheme in which information is unformly protected by an error-correcting code.
This paper described a new high-speed search method based on newly introduced conditions holding the relationship among tape speed, drum rotation speed and number of recording tracks per frame for good quality images.
ISBN:
(纸本)0780308433
This paper described a new high-speed search method based on newly introduced conditions holding the relationship among tape speed, drum rotation speed and number of recording tracks per frame for good quality images.
This paper investigates a multihopping scheme for MFSK (Multilevel Frequency Shift Keying)/FH-SSMA (Frequency Hopping-Spread Spectrum Multiple Access) system. Moreover, we propose and investigate a modified decoding s...
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This paper investigates a multihopping scheme for MFSK (Multilevel Frequency Shift Keying)/FH-SSMA (Frequency Hopping-Spread Spectrum Multiple Access) system. Moreover, we propose and investigate a modified decoding scheme for the coded MFSK/FH-SSMA system. In this multi-hopped MFSK/FH-SSMA system, several hopping frequencies per chip are assigned and transmitted in parallel in order to improve its frequency diversity capability for a fading channel. We theoretically analyze the performance of the multihopped MFSK/FH-SSMA system in a Rayleigh fading channel. Moreover, in the coded MFSK/FH-SSMA system, we propose a modified scheme of the error and erasure decoding of an error-correcting code. The modified decoding scheme utilizes the information of rows having the largest number of entries in the decoded time-frequency matrix. Their BER (Bit Error Rate) performance is evaluated by theoretical analysis in order to show the improvement in user capacity.
A new method of additive coding is proposed, which provides for a simpler and faster coder design than the known ones. The coders built by this method enhance tolerance of computer systems to faults in both memory loc...
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A new method of additive coding is proposed, which provides for a simpler and faster coder design than the known ones. The coders built by this method enhance tolerance of computer systems to faults in both memory locations and parallel communication lines.
Basic decoding characteristics of a minimum bit error decoding (MBED), originally proposed by Bahl et al., is investigated. It is shown that MBED can predict the bit error rate of each decoded bit with good precision....
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Basic decoding characteristics of a minimum bit error decoding (MBED), originally proposed by Bahl et al., is investigated. It is shown that MBED can predict the bit error rate of each decoded bit with good precision. Then MBED is applied to the convolutional/Reed-Solomon (RS) concatenated coding scheme. The outer RS codes are decoded by an erasure decoding using the symbol erasure information provided from the MBED results of inner convolutional codes. Simulation results show that the overall bit error rate is reduced one-half to one-third more than the conventional nonerasure decoding.
The bit interleaved parity codes recommended for synchronous digital hierarchy are applied to error monitoring functions. The performance of these codes in terms of their bit error rate assessment capability is analysed.
The bit interleaved parity codes recommended for synchronous digital hierarchy are applied to error monitoring functions. The performance of these codes in terms of their bit error rate assessment capability is analysed.
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