摘要:
The invention relates to a method for coding a sequence of images divided into blocks, comprising the following steps for a current block:—selecting, for the current block, a coding mode in a set of coding modes that comprises at least two coding modes, and a transform in a set of transforms that comprises at least a first transform and a second transform; and—coding the current block according to the coding mode and the transform selected. The coding mode and the transform, themselves, are selected according to the following steps:—selecting the coding mode in the set of coding modes while using the first transform, and—selecting the transform in the set of transforms while using the coding mode selected.
摘要:
The method is characterized in that the step for selecting a coding mode from the inter modes and from the intra modes is broken down into two sequential steps, a step for preselecting the intra coding mode for preselecting an intra mode for the current macroblock from the intra coding modes, and a coding decision step, part of the effective coding of the current macroblock for selecting the mode of coding the current macroblock from the inter modes and the preselected intra mode and in that the preselection step for the current macroblock is carried out during the coding decision step for a preceding macroblock.
摘要:
The method is characterized in that the step for selecting a coding mode from the inter modes and from the intra modes is broken down into two sequential steps, a step for preselecting the intra coding mode for preselecting an intra mode for the current macroblock from the intra coding modes, and a coding decision step, part of the effective coding of the current macroblock for selecting the mode of coding the current macroblock from the inter modes and the preselected intra mode and in that the preselection step for the current macroblock is carried out during the coding decision step for a preceding macroblock.
摘要:
The method comprises the following steps: during the first pass, a memorization of the M best coding modes and their coding parameters per image macroblock, during the second pass, a calculation, according to the new quantization step determined by the regulating algorithm according to the parameters memorized, among the M coding modes memorized, of the coding mode minimising the bitrate-distortion criterion, to select it, a coding according to the selected coding mode. The applications relate to the compression of data.
摘要:
According to the compressed video data stream switching method for the transmission of a first data stream corresponding to a first video sequence, followed by, in a given switching point of this first stream, a second data stream corresponding to a second video sequence, the second data stream is modified prior to transmission, by a replacement of the bidirectional pictures with bidirectional commutation pictures of which the pictures blocks have a null residue and a null motion vector which is either forward or backward, according to the position of the blocks in the picture.
摘要:
The invention is made in the field of coding of images of high dynamic range.The invention is based on the concept of Frame Compatible format. The idea is to transport, in a frame, down-sampled LDR content together with additional information allowing reconstructing HDR content from the LDR content. Thus, it is proposed a method of encoding an HDR image of high dynamic range according to claim 1. Said method comprises down-sampling (DWN) an LDR image and additional data, the LDR image providing a lower dynamic range depiction of the HDR image content and the additional data allowing for reconstructing the HDR image from the LDR image.
摘要:
The method comprises the steps for the: calculation of a rate of potential use of an entity of the picture k for a backward predictive coding of the picture k−s, according to the number of vectors of the backward motion vector field of the picture k−s pointing to the entity of the picture k or in its near surroundings and/or calculation of a rate of potential use of an entity of the picture k for a forward predictive coding of the picture k+p, according to the number of vectors of the forward motion vector field of the picture k+p pointing to the entity of the picture k or in its near surroundings, coding of the picture entity or the picture comprising the entity according to the rate of use of the picture entity. The applications concern the hybrid type compression diagrams.
摘要:
According to the method, the second data stream is modified prior to transmission, by a replacement of the bidirectional pictures with bidirectional commutation pictures of which the pictures blocks have a null residue and a null motion vector which is either forward or backward, according to the position of the blocks in the picture.The applications relate to the transmissions and the storage of programmes, the editing.
摘要:
The method wherein the field or frame mode is selected according to the following steps: determination of a motion vector associated with a co-located macroblock of a macroblock to be coded and finding in the next reference picture, a predefined macroblock to be coded, for the selection, in field or frame mode, scaling of the motion vector according to the temporal distances between the reference pictures corresponding to this motion vector and between the current picture, field or frame, according to a predefined mode and a reference picture chosen from among the reference pictures corresponding to this motion vector, determination of the temporal macroblock in the chosen reference picture, designated by the motion vector scale attributed to the macroblock to be coded, and its field or frame coding mode, selection of field or frame coding mode of the temporal macroblock for the coding of the current macroblock. The applications relate to the compression of data using for example the MPEG4 part 10 standard.
摘要:
The invention relates to a method for coding an image data macroblock of a sequence of images presented in the form of a base layer and at least one enhancement layer. The image data macroblock to which corresponds an image data block in the base layer, called a corresponding block, belongs to the enhancement layer. The method comprises the following steps: generate, for the said image data macroblock, a prediction macroblock of image data from one block or several blocks of image data blocks of the said base layer previously coded and reconstructed, generate a macroblock of residues from the prediction macroblock and from the image data macroblock MBEL of the enhancement layer, and code the said macroblock of residues. According to the invention, the image data blocks of the said base layer are different from the corresponding block.
摘要翻译:本发明涉及一种用于编码以基层和至少一个增强层形式呈现的图像序列的图像数据宏块的方法。 被称为对应块的基础层中对应于图像数据块的图像数据宏块属于增强层。 该方法包括以下步骤:为所述图像数据宏块生成来自预先编码和重建的所述基本层的一个块或多个图像数据块的图像数据的预测宏块,从预测生成残差宏块 宏块和来自增强层的图像数据宏块MB EL EL,并对所述宏块进行编码。 根据本发明,所述基础层的图像数据块与相应的块不同。