Abstract:
원 영상과 상기 원 영상에 대한 예측 영상 간의 차이를 나타내는 차분 영상 블록 내에 존재하는 경계선을 기초로 상기 차분 영상 블록을 제1 영역과 제2 영역으로 분리하는 신호 분리기; 상기 제1 영역에 대하여 이산 여현 변환(Discrete Cosine Transform: DCT)을 이용하여 변환 부호화를 수행하는 변환 부호화부; 상기 변환 부호화부의 출력을 주파수 영역에서 양자화하는 양자화부; 상기 제2 영역을 공간 영역에서 양자화하는 공간 영역 양자화부; 및 상기 양자화부 및 상기 공간 영역 양자화부의 출력을 이용하여 엔트로피 부호화를 수행하는 엔트로피 부호화부를 포함하는 동영상 부호화 장치가 제공된다.
Abstract:
PURPOSE: A video encoding/decoding device using an adaptive conversion encoding/decoding region based on characteristic of a differential signal and a method thereof are provided not to include a boundary region signal inside a converting and encoding block, thereby increasing energy compaction of a signal after converting and encoding. CONSTITUTION: A signal divider(131) divides a differential signal of an image block into a non boundary area signal and a boundary area signal. A converting and encoding unit(133) performs a DCT(Discrete Cosine Transform) of the non boundary area signal. A quantization unit(135) quantizes the DCT-converted non-boundary area signal in a frequency domain. A spatial area quantization unit(137) quantizes the boundary area signal in a space area.
Abstract:
PURPOSE: An image encoding/decoding method and device thereof are provided to improve image encoding performance by adaptively allocating a codeword about a syntax element in an image encoding environment having various resolutions and a picture quality. CONSTITUTION: An image encoding device(110) includes a characteristic analyzing unit(111), a codeword allocating unit(112), and an encoding unit(113). The characteristic analyzing unit analyzes a characteristic of encoding data which encoded characteristic of an input image and the input image. The codeword allocating unit allocates a codeword to a syntax element of the input image according to a characteristic of the encoding data. The encoding unit generates a bit stream by encoding the input image by the codeword.
Abstract:
PURPOSE: A method and apparatus for video encoding/decoding using an adaptive codeword assignment to syntax elements are provided to enhance encoding performance under an image encoding environment having various encoding bit rates and various image sizes. CONSTITUTION: A feature analysis unit(111) analyzes the features of encoding data obtained from an input image, and a codeword assignment unit(112) allocates a codeword to a symbol value of a syntax element when using the input image. An encoding unit(113) encodes the syntax elements in the codeword to generate a bit stream.
Abstract:
PURPOSE: A video encoding device and a method thereof are provided to separate a differential image block into non-border area and a border area base on border line within the differential image block, thereby increasing energy compaction. CONSTITUTION: A signal divider(131) divides a differential image block into the first area and the second area. Through DCT(Discrete Cosine Transform), a converting and encoding unit(133) performs conversion encoding of the first area. A quantization unit(135) quantize output of the conversion encoding unit in a frequency domain. A spatial area quantization unit(137) quantizes the second area in a spatial domain. By using the quantization unit and output of the space area quantization unit, an entropy encoding unit(180) performs entropy encoding.