公开(公告)号：EP2927865A1

公开(公告)日：2015-10-07

申请号：EP14305480.7

申请日：2014-04-01

申请人： Thomson Licensing ,  INRIA - Institut National de Recherche en Informatique et en Automatique

发明人： Le Pendu, Mikaël ,  Boitard, Ronan ,  Thoreau, Dominique ,  Guillemot, Christine

IPC分类号： G06T5/00 ,  G06T5/40 ,  H04N19/30

CPC分类号： H04N19/30 ,  G06T5/009 ,  G06T5/40 ,  G06T2207/20208 ,  H04N19/117 ,  H04N19/147 ,  H04N19/186

摘要： To encode High Dynamic Range (HDR) images, the HDR images can be converted to Low Dynamic Range (LDR) images through tone mapping operation, and the LDR images can be encoded with an LDR encoder. The present principles formulates a rate distortion minimization problem when designing the tone mapping curve. In particular, the tone mapping curve is formulated as a function of the probability distribution function of the HDR images to be encoded and a Lagrangian multiplier that depends on encoding parameters. At the decoder, based on the parameters indicative of the tone mapping function, an inverse tone mapping function can be derived to reconstruct HDR images from decoded LDR images.

摘要翻译： 要编码高动态范围（HDR）图像，HDR图像可以通过色调映射操作转换为低动态范围（LDR）图像，LDR图像可以用LDR编码器编码。 本原理在设计色调映射曲线时制定了速率失真最小化问题。 特别地，色调映射曲线被表达为要被编码的HDR图像的概率分布函数和取决于编码参数的拉格朗日乘数的函数。 在解码器中，基于指示色调映射函数的参数，可以导出逆色调映射函数，以从解码的LDR图像重建HDR图像。

公开(公告)号：EP2782347A1

公开(公告)日：2014-09-24

申请号：EP13305333.0

申请日：2013-03-20

申请人： Thomson Licensing ,  INRIA - Institut National de Recherche en Informatique et en Automatique

发明人： Guillemot, Christine ,  Cherigui, Safa ,  Thoreau, Dominique ,  Guillotel, Philippe

IPC分类号： H04N19/154 ,  H04N19/105 ,  H04N19/176 ,  H04N19/194 ,  H04N19/97

CPC分类号： H04N19/194 ,  H04N19/105 ,  H04N19/154 ,  H04N19/176 ,  H04N19/97

摘要： The present invention generally relates to a method for predicting a block of pixels from at least one patch comprising a block of pixels and a causal neighborhood around this block of pixels. The method comprises the following steps:
- determining (1) a mapping (F1, W) of a causal neighborhood, around that block of pixels to be predicted, on the block of pixels to be predicted in order that the block of pixels of each patch is best predicted by mapping the neighbourhood of that patch on the block of pixels of that patch, and
- predicting (2) the block of pixels from a prediction block (X̃ u 1 ) computed by applying the determined mapping (F1, W) on the neighbourhood of the block of pixels to predict.

摘要翻译： 本发明一般涉及一种用于从包括像素块和围绕该像素块的因果邻域的至少一个补丁预测像素块的方法。 该方法包括以下步骤： - 确定（1）要预测的像素块周围的要预测的像素块的因果邻域的映射（F1，W），以便将要预测的像素块 通过将该贴片的邻域映射到该贴片的像素块上，并且通过应用确定的映射（F1，W）来计算（2）来自预测块（X u 1）的像素块来预测补片， 在像素块的邻域预测。

公开(公告)号：EP2782344A1

公开(公告)日：2014-09-24

申请号：EP14160507.1

申请日：2014-03-18

申请人： Thomson Licensing

发明人： Cherigui, Safa ,  Martin, Alain ,  Thoreau, Dominique ,  Guillotel, Philippe ,  Guillemot, Christine

IPC分类号： H04N19/00

CPC分类号： G06T9/00 ,  H04N19/105 ,  H04N19/136 ,  H04N19/176 ,  H04N19/593 ,  H04N19/61

摘要： The invention relates to a method for predicting a pixel block of an image using a weighted sum of pixel blocks belonging to patches of a dictionary ( D l ) from a set of candidate patches (PS), each patch being formed of a pixel block of an image and a causal neighbourhood of this pixel block. The method is characterised in that a subset of candidate patches (SPS) is obtained from the set of candidate patches (PS) and the dictionary ( D l ) is formed of a patch of the subset of candidate patches (SPS), called the first patch, and at least one other patch of said set of candidate patches (PS), called the second patch.

摘要翻译： 本发明涉及一种用于使用属于来自一组候选补丁（PS）的字典（D 1）的补丁的像素块的加权和预测图像的像素块的方法，每个补丁由像素块 该像素块的图像和因果关联。 该方法的特征在于，从候选补丁（PS）集合获得候选补丁（SPS）的子集，并且字典（D 1）由候选补丁（SPS）的子集的补丁形成，称为第一 补片，以及称为第二补丁的所述候选补丁（PS）组中的至少一个补丁。

公开(公告)号：EP2958329B1

公开(公告)日：2018-12-05

申请号：EP14305920.2

申请日：2014-06-16

申请人： Thomson Licensing

发明人： Le Pendu, Mikaël ,  Thoreau, Dominique ,  Alain, Martin ,  Guillemot, Christine

IPC分类号： H04N19/98 ,  H04N19/593 ,  H04N19/463 ,  H04N19/625 ,  H04N19/176 ,  H04N19/126 ,  H04N19/136

CPC分类号： H04N19/625 ,  H04N19/126 ,  H04N19/136 ,  H04N19/176 ,  H04N19/42 ,  H04N19/45 ,  H04N19/463 ,  H04N19/593 ,  H04N19/98

摘要： A method for encoding and decoding an image block, an encoder, and a decoder are provided. The method for encoding an image block comprises: determining a local dynamic range of the block; adaptively precision-extending pixel values of the block based on the local dynamic range of the block; and encoding the block with an adaptively extended precision. The method for decoding an image block comprises: determining a minimum pixel value of the block and an indicating value for indicating a precision extension factor according to precision extension information; decoding the block according to the indicating value; and de-extending precision of the decoded block based on the minimum pixel value of the block and the precision extension factor. The precision of the intermediate calculations may be improved without increasing an original intermediate bit depth used in intermediate calculations.

公开(公告)号：EP3096518A1

公开(公告)日：2016-11-23

申请号：EP15305760.9

申请日：2015-05-20

申请人： Thomson Licensing

发明人： Le Pendu, Mikaël ,  Alain, Martin ,  Thoreau, Dominique ,  Guillemot, Christine

IPC分类号： H04N19/176 ,  H04N19/102 ,  H04N19/136

CPC分类号： H04N19/33 ,  H04N19/102 ,  H04N19/136 ,  H04N19/176

摘要： The present principles provide a method and an encoder for encoding an image frame. The method includes generating, with a processor, for each block in the image frame a prediction block based on at least a prediction method; generating a scaling factor and an offset for adjusting the prediction block; and transforming the prediction block into an adjusted prediction block based on the scaling factor and the offset. The encoder includes a processor configured to, for each block in the image frame, generate a prediction block based on at least a prediction method and generate a scaling factor and an offset for adjusting the prediction block and to transform the prediction block into an adjusted prediction block based on the scaling factor and the offset. The scaling factor and offset minimize error between the block and the adjusted prediction block.

摘要翻译： 本原理提供了一种用于编码图像帧的方法和编码器。 该方法包括：基于至少预测方法，利用处理器为图像帧中的每个块生成预测块; 生成用于调整预测块的缩放因子和偏移量; 以及基于所述缩放因子和所述偏移将所述预测块变换为调整后的预测块。 所述编码器包括：处理器，被配置为，对于所述图像帧中的每个块，至少基于预测方法生成预测块，并生成用于调整所述预测块的缩放因子和偏移量，并将所述预测块变换为调整预测 基于缩放因子和偏移量的块。 缩放因子和偏移最小化块和调整后的预测块之间的误差。