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1. 发明申请

WO2017090068A1 METHOD FOR ENCODING AND DECODING OF HDR IMAGES 审中-公开
标题翻译：用于编码和解码HDR图像的方法
公开(公告)号：WO2017090068A1
公开(公告)日：2017-06-01
申请号：PCT/IT2016/000279
申请日：2016-11-25
申请人： AGOSTINELLI, Massimiliano
发明人： AGOSTINELLI, Massimiliano
IPC分类号： H04N19/98 , H04N5/202 , H04N19/46 , H04N19/503
CPC分类号： H04N19/98 , H04N5/202 , H04N19/46 , H04N19/503
摘要： The invention relates to a method for encoding high dynamic range images, both static images and video frames. The method comprises the steps of: a) acquiring (100) a high dynamic range image in floating point format; b) calculating (101) the dynamic range of the acquired image; c) calculating the image average luminance; d) calculating a parameter dynamic_range (102) by adding to or subtracting from the dynamic range value calculated at step b) a predetermined value, the addition or subtraction of such predetermined value depending on image average luminance calculated at step c); e) multiplying (103) the values of the pixels of the acquired image by a factor equal to 2 -dynamic_range ; f) raising to a power equal to 1.0/(2.2+add_gamma) the values of the pixels calculated at step e), where add_gamma is a value higher than or equal to zero; g) reducing the number of bits used for encoding the image pixels (105) such to convert the image in a format with a dynamic range lower than that of the acquired image; h) compressing the lower dynamic range image (106). The invention relate also to a corresponding image decoding method and to devices for encoding and decoding images and videos.
摘要翻译：本发明涉及一种编码高动态范围图像（静态图像和视频帧）的方法。该方法包括以下步骤：a）获取（100）浮点格式的高动态范围图像; b）计算（101）所获取的图像的动态范围; c）计算图像平均亮度; d）通过向步骤b）计算出的动态范围值加上或减去预定值，计算参数动态范围（102），该步骤c）中计算出取决于图像平均亮度的这种预定值的加或减; e）将所获取的图像的像素的值乘以等于2 -dynamic_range 的因子; f）增加等于1.0 /（2.2 + add_gamma）的功率，其中add_gamma是大于或等于零的值; g）减少用于对图像像素（105）进行编码的比特的数量，以便以动态范围低于所获取的图像的动态范围的格式转换图像; h）压缩较低动态范围图像（106）。本发明还涉及相应的图像解码方法和用于对图像和视频进行编码和解码的设备。

2. 发明申请

WO2017199210A1 METHOD FOR ENCODING AND DECODING HDR IMAGES 审中-公开
标题翻译：用于编码和解码HDR图像的方法
公开(公告)号：WO2017199210A1
公开(公告)日：2017-11-23
申请号：PCT/IB2017/052956
申请日：2017-05-19
申请人： AGOSTINELLI, Massimiliano
发明人： AGOSTINELLI, Massimiliano
IPC分类号： H04N19/103 , H04N19/182 , H04N19/184 , H04N19/186 , H04N19/33 , H04N19/42 , H04N19/463
CPC分类号： H04N19/33 , H04N19/103 , H04N19/182 , H04N19/184 , H04N19/186 , H04N19/42 , H04N19/423 , H04N19/463
摘要： The invention relates to a method for encoding HDR images (102), of the type wherein the HDR image (102) is encoded in a first data stream (103) containing a LDR image with colour range lower than that of the HDR image, and in a second data stream (104) containing a residual image obtained from the HDR image and from the LDR image. The method provides to - process the LDR image (1012, 1018) and the HDR image (1011) so as to bring them in the same colour space with samples in logarithmic space; - generate (1020) a first residual image in logarithmic space by subtracting the HDR image with samples in logarithmic space from the LDR image with samples in logarithmic space; - generate (1021, 1024, 1025) the residual image by processing the first residual image in logarithmic space so as to adapt it to a format required as input by an encoder which inserts the residual image in the second data stream; - generate (1018) a first look-up table that maps the values of samples of the LDR image on the values of the processed LDR image in logarithmic space; - generate (1023) a second look-up table that maps the values of the residual image samples inserted in the second data stream on the values of the processed residual image in logarithmic space; - insert the first and the second table in the first (103) or in the second (104) data stream. The invention relates also to a method for reconstructing a HDR image encoded in two data streams containing a LDR image and a residual image respectively.
摘要翻译：本发明涉及一种用于编码HDR图像（102）的方法，其中HDR图像（102）被编码在包含具有较低颜色范围的LDR图像的第一数据流（103）中（HDR）图像以及包含从HDR图像和LDR图像获得的残差图像的第二数据流（104）中。该方法提供 - 处理LDR图像（1012,1018）和HDR图像（1011），以使其与对数空间中的样本处于相同的颜色空间中; - 通过用对数空间中的样本从对数空间中的LDR图像减去具有对数空间的样本的HDR图像，在对数空间中生成（1020）第一残差图像; - 通过处理对数空间中的第一残差图像来生成（1021,1024,1025）残差图像，以便将其适配为由将第二数据流中插入残余图像的编码器输入所需的格式; - 生成（1018）第一查找表，该第一查找表将LDR图像的样本的值映射到对数空间中的经处理的LDR图像的值; - 生成（1023）第二查找表，其将插入第二数据流中的残差图像样本的值映射到对数空间中的经处理的残差图像的值; - 将第一和第二表插入第一（103）或第二（104）数据流中。本发明还涉及用于分别重建在包含LDR图像和残差图像的两个数据流中编码的HDR图像的方法。

3. 发明申请

WO2016055875A1 IMPROVED VIDEO AND IMAGE ENCODING PROCESS 审中-公开
标题翻译：改进的视频和图像编码过程
公开(公告)号：WO2016055875A1
公开(公告)日：2016-04-14
申请号：PCT/IB2015/054544
申请日：2015-06-16
申请人： AGOSTINELLI, Massimiliano
发明人： AGOSTINELLI, Massimiliano
IPC分类号： H04N19/117 , H04N19/186 , H04N19/187 , H04N19/33 , H04N19/85
CPC分类号： H04N19/186 , H04N19/117 , H04N19/187 , H04N19/33 , H04N19/85
摘要： A method for processing image and video data, comprising providing high dynamic range image data (HDR) and a corresponding low dynamic range image data (LDR). The LDR image is encoded in a legacy code stream, while a residual code stream is generated and encoded containing data necessary for the reconstruction of the HDR image in a decoding phase. To generate the residual code stream, LDR image data are processed so as to obtain a processed LDR* image, then a component data of the HDR image and a corresponding component of the processed LDR* image are selected and residual data of the selected component data are calculated by dividing the component of the processed LDR* image data by the component of the HDR image data. The residual data of the selected component are scaled into the range of values comprised between 0 and 1 and are then encoded in a residual code stream. A decoding method is also disclosed which allows reconstruction of an HDR image from a legacy code stream and a residual data code stream.
摘要翻译：一种用于处理图像和视频数据的方法，包括提供高动态范围图像数据（HDR）和对应的低动态范围图像数据（LDR）。 LDR图像被编码在遗留代码流中，而生成并编码残留代码流并包含在解码阶段中重建HDR图像所需的数据。为了生成残留代码流，对LDR图像数据进行处理以获得经处理的LDR *图像，然后选择HDR图像的分量数据和处理的LDR *图像的对应分量，并且选择的分量数据的残差数据通过将经处理的LDR *图像数据的分量除以HDR图像数据的分量来计算。所选择的分量的残差数据被缩放到包含在0和1之间的值的范围内，然后被编码在残余码流中。还公开了一种解码方法，其允许从遗留码流和残余数据码流重构HDR图像。

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