DETECTION OF TRANSMISSION ERRORS IN BLOCK CODED IMAGES

Jarmila Pavlovičová - Jaroslav Polec - Milan Keleši - Martin Mokoš

   The effect of cell loss or random bit error during transmission causes image degradation in the case of highly compressed images serious. We use ARQ (Automatic Repeat reQuest) as the error control scheme. Conventional ARQ uses an error detection code (Cyclic Redundancy Check - CRC) to trigger retransmission. Retransmission of all bit errors is not efficient. To improve the throughput, we use an ARQ scheme that detects only those channel errors that would cause serious image degradation - Side Match Test (SMT) [1]. In this study we use the SMT in JPEG and VQ (Vector Quantization) coded images transmitted through an independent symmetric binary transmission channel without memory.

Keywords: error detection, JPEG, vector quantization, independent symmetric binary transmission channel without memory

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