DIGITAL VIDEO COMMUNICATION APPARATUS

摘要

Encoding and decoding methods for digital video communication apparatus, by which deterioration of the efficiency of encoding resulting from the leak estimate is prevented. Range correcting means (3) corrects the range of the data on the preceding screen image stored in storage means (1) in accordance with the reference value which is output from reference value output means (2). After that, leak coefficient multiplying means (4) outputs a given leak coefficient by multiplication. Then reverse correcting means (5) reversely corrects the data output from the leak coefficient multiplying means (4) to restore the correction made by the range correcting means (3). Estimated error outputting means (6) measures the difference between the inputted digital image data on the current screen and the data reversely corrected by the reverse correcting means (5), and outputs the difference as an estimated error difference. Estimated error difference encoding means (7) encodes the estimated error difference outputted from the estimated error difference outputting means (6) and outputs the coded error difference.