QUANTIZATION PARAMETER DETERMINATION METHOD AND APPARATUS AND VIDEO ENCODING/DECODING METHOD AND APPARATUS

摘要

PURPOSE: A quantization parameter determining method, a quantization parameter determining device, an image encoding/decoding method using the same and an image encoding/decoding device are provided to improve compression performance through efficient encoding by determining a quantization parameter adaptively depending on the characteristic of an image. CONSTITUTION: A complexity calculating unit(210) calculates the complexity of a peripheral block. A threshold value setting unit(220) sets a threshold value for the determination of a complexity degree. If the complexity is lower than the threshold value, a quantization parameter determining unit(230) determines a preset basic quantization parameter as a current block quantization parameter. If the complexity is higher than the threshold value, the quantization parameter determining unit determines a quantization parameter whose value is smaller than the basic quantization parameter as the current block quantization parameter.