AN IMPROVED EARLY DETECTION OF ALL-ZERO DCT COEFFICIENTS FOR FAST VIDEO ENCODING

摘要

A method for skipping DCT(Discrete Cosine Transform) and quantization processes in order to fast compress a moving picture is provided to make fast encoding possible by deriving a correct sufficient condition in which all DCT coefficients are quantized with zero through theoretical analysis of the DCT coefficients. A maximum DCT coefficient which is converted into an integer is searched in an H.264 moving picture standard encoding method(S100). DCT and quantization processes are skipped if the maximum DCT coefficient is smaller than a predetermined threshold value. It is determined whether the maximum DCT coefficient satisfies a threshold condition decided by predetermined expressions(S110). An entropy encoding process is directly performed without DCT, quantization, dequantization and IDCT(Inverse DCT) processes if the maximum DCT coefficient satisfies the threshold condition(S120,S140). All typical processes for compressing a moving picture are performed if the maximum DCT coefficient does not satisfy the threshold condition(S130).