| 摘要 |
An image is vector-quantized into coded data, which is stored in a storage device. The coded data is read out of the storage device and is decoded. The decoded data may cause an overflow due to a vector quantization error. If every piece of coded data is checked for an overflow when it is decoding, a large number of processes must be carried which extends the decoding time. To solve this problem, each piece of coded data is once decoded in the vector quantization stage, to determine whether or not the coded data causes an overflow. If it is determined that it causes an overflow, the coded data is provided with exception judging information indicating that an exceptional overflow process must be carried out when decoding the coded data. As a result, the exceptional overflow process is carried out only when required in a decoding stage, to shorten a decoding time.
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