ENCODING METHOD, DECODING METHOD AND APPARATUS THEREOF

• Main Author: HAN KI-HUN
• Format: Patent
• Language: English
• Published: 30.06.2011
• Subjects: ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; PICTORIAL COMMUNICATION, e.g. TELEVISION

PROBLEM TO BE SOLVED: To provide moving picture encoding and decoding methods and devices, which can reduce the amount of bits necessary for switching between an irreversible mode and a reversible mode. SOLUTION: The moving picture encoding device includes: a prediction section that generates a residual signal which is a differential of an input image; a transformation/quantization section that performs or skips transformation and quantization of the residual signal depending on mode information; an entropy-coding section that entropy-codes the residual signal through the transformation/quantization section to generate a bit stream; a reversible-mode QP range determining section that determines a reversible-mode QP range using the amount of bits generated by the entropy-coding section and a quantization coefficient (QP); and a mode determining section that compares a current QP value with the determined reversible-mode QP range to determine one of an irreversible mode and a reversible mode and transmits mode information on the determined mode to the transformation/quantization section. Accordingly, it is possible to reduce the amount of bits necessary for switching an irreversible mode and a reversible mode. COPYRIGHT: (C)2011,JPO&INPIT