摘要:
When an intra-frame prediction process at a time of generating a prediction image is a horizontal one, an intra prediction unit adds a value proportional to a change in a horizontal direction of the luminance values of pixels adjacent to the top of each prediction block to the luminance value of a pixel adjacent to the left of the prediction block to determine a result of the addition as a predicted value of a prediction image, whereas when the intra-frame prediction process at the time of generating the prediction image is a vertical one, the intra prediction unit adds a value proportional to a change in a vertical direction of the luminance values of pixels adjacent to the left of the prediction block to the luminance value of the pixel adjacent to the top of the prediction block to determine the result of the addition as a predicted value of the prediction image.
摘要:
Disclosed is an image encoding device including a predicting unit 4 for adaptively determining the size of each motion prediction unit block according to color component signals, and for dividing each motion prediction unit block into motion vector allocation regions to search for a motion vector, and a variable length encoding unit 8 for, when a motion vector is allocated to the whole of each motion prediction unit block, performing encoding in mc_skip mode if the motion vector is equal to an estimated vector and a prediction error signal 5 does not exist, and for, when each motion vector allocation region has a size equal to or larger than a predetermined size and a motion vector is allocated to the whole of each motion vector allocation region, performing encoding in sub_mc_skip mode if the motion vector is equal to an estimated vector and a prediction error signal 5 does not exist.
标题翻译:BILDCODIERUNGSVORTHHTUNG,BILDDECODIERUNGSVORRICHTUNG,VORTHHTUNG ZUR UMWANDLUNG EINES CODIERTEN DATENSTROMS,BILDCODIERUNGSVERFAHREN UND BILDDECODIERUNGSVERFAHREN
摘要:
When a randomly-accessible inter picture is encoded, a prediction image generator sets a reference picture from among a plurality of randomly-accessible intra pictures, and performs a motion-compensated prediction using the set reference picture for a prediction process, and a variable length encoding unit 13 encodes both picture position information showing the position of the reference picture, and identification information showing that the randomly-accessible inter picture is randomly accessible, and multiplexes encoded data about both the picture position information and the identification information into a bitstream.
摘要:
When the signal format of a color image is YUV4:2:2, and an intra prediction parameter, which is used for an intra-frame prediction process on the chrominance signals in a prediction block, shows the same prediction mode as an intra prediction mode for the luminance signal in the prediction block, an intra prediction unit 4 converts an index indicating the intra prediction mode for the luminance signal, and performs the intra-frame prediction process on the chrominance signals in an intra prediction mode indicated by the index after conversion.
摘要:
When carrying out an intra-frame prediction process to generate an intra prediction image by using an already-encoded image signal in a frame, an intra prediction part 4 selects a filter from one or more filters which are prepared in advance according to the states of various parameters associated with the encoding of a target block to be filtered, and carries out a filtering process on a prediction image by using the filter. As a result, prediction errors which occur locally can be reduced, and the image quality can be improved.