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    • 3. 发明申请
    • METHOD FOR LOCALLY ADJUSTING A QUANTIZATION STEP
    • 用于本地调整量化步骤的方法
    • WO2006106032A1
    • 2006-10-12
    • PCT/EP2006/060804
    • 2006-03-16
    • THOMSON LICENSINGHUGUENEL, LilaTHOREAU, DominiqueGUILLOTEL, Philippe
    • HUGUENEL, LilaTHOREAU, DominiqueGUILLOTEL, Philippe
    • H04N7/30
    • H04N19/192H04N19/124H04N19/152H04N19/154H04N19/17H04N19/179H04N19/60
    • The invention relates to a method of locally adjusting a quantization step for each region of an image in a sequence of n images. The method comprises the following steps: calculating, for each image of the sequence, a first difference of bits saved on the potential masking region when quantizing it with a first quantization step and a second difference of bits required by the region of interest when quantizing it with a second quantization step; and in each image of the sequence, assigning to the potential masking region the first quantization step and if the sum of the n first differences of bits (GPOT) is higher than the sum of the n second differences of bits (DROI), assigning said second quantization step to said region of interest and otherwise assigning a third quantization step such that the sum of said n first differences of bits is distributed between the regions of interest according to a reconstruction quality criterion.
    • 本发明涉及一种以n个图像序列为单位的图像的每个区域局部调整量化步长的方法。 该方法包括以下步骤:对于序列的每个图像,当量化它时,以第一量化步长和感兴趣区域所需的位的第二差值计算在潜在掩蔽区域上保存的位的第一差值, 用第二量化步骤; 并且在所述序列的每个图像中,将所述第一量化步骤分配给所述潜在屏蔽区域,并且如果所述n个第一差分比特(GPOT)的和高于所述n个第二差分比特的总和(DR0I),则将所述 第二量化步骤到所述感兴趣的区域,否则分配第三量化步骤,使得所述n个第一差分的和根据重构质量标准分布在感兴趣区域之间。
    • 8. 发明申请
    • DEVICE AND METHOD FOR THE PREPARATION OF SENDING DATA AND CORRESPONDING PRODUCTS
    • 用于制作发送数据和对应产品的设备和方法
    • WO2005055553A2
    • 2005-06-16
    • PCT/EP2004/053143
    • 2004-11-26
    • THOMSON LICENSING S.A.BORDES, PhilippeGUILLOTEL, PhilippeLORETTE, Anne
    • BORDES, PhilippeGUILLOTEL, PhilippeLORETTE, Anne
    • H04L29/06
    • H04L65/607H04L29/06027H04N21/234327H04N21/23439H04N21/2383H04N21/2402H04N21/2662H04N21/4382H04N21/64322
    • The present invention relates to a device (1) and a method for the preparation of data (21) to be sent as a continuous stream via a communication network. The device comprises means for obtainment (11) of the data originating from a database (2), which contains at least two data stream entities (Ej) for data associated respectively with different transmission throughputs (24), means of transfer (12) of these data to a sending system (3), means of connection (13) to one of these entities, and means of switching (14) of the means of connection from one of the entities to another. The preparation device also comprises means of regular addition (15) to the data transferred, of error correction codes (22). The means of switching switch from a first entity to a second entity of greater throughput, when this augmented data stream (DATA) reaches the sum of the sending throughput associated with the second entity and of an additional throughput (possibly zero) associated with an initial input of error correction codes of the second entity, and the means of addition reinitialize the addition of the codes to this initial input upon this switching. Application to streaming over IP network.
    • 本发明涉及一种用于通过通信网络作为连续流发送的数据(21)的准备装置(1)和方法。 该设备包括用于获取(11)从数据库(2)获得的数据(11)的装置,其包含用于分别与不同传输吞吐量(24)相关联的数据的至少两个数据流实体(Ej),传输装置(12) 这些数据发送到发送系统(3),连接到这些实体中的一个的连接装置(13)以及从一个实体到另一个实体切换(14)连接装置的装置。 准备装置还包括对数据传送的常规加法(15),纠错码(22)。 当该增强数据流(DATA)达到与第二实体相关联的发送吞吐量的总和与与初始值相关联的附加吞吐量(可能为零))之和时,将交换机从第一实体切换到具有更大吞吐量的第二实体的装置 第二实体的纠错码的输入和加法装置在该切换时重新初始化该初始输入的代码的相加。 应用于IP网络流。
    • 9. 发明申请
    • TRANSCODING METHOD AND DEVICE IMPLEMENTING SAID METHOD
    • TRANSCODING方法和设备实现方法
    • WO2008090132A1
    • 2008-07-31
    • PCT/EP2008/050664
    • 2008-01-21
    • THOMSON LICENSINGGABORIEAU, OlivierLE MEUR, OlivierGUILLOTEL, PhilippeBORDES, Philippe
    • GABORIEAU, OlivierLE MEUR, OlivierGUILLOTEL, PhilippeBORDES, Philippe
    • H04N7/26H04N7/50
    • H04N19/124H04N19/149H04N19/176H04N19/40H04N19/46H04N19/61
    • The invention relates to a transcoding method of a first bitstream (S1) representing a sequence of images into a second bitstream (S2).It comprises the following steps: -entropydecoding (300) of at least one partof said first bitstream (S1) into a batch of at least one macroblock, -inverse quantization (330), with a first quantization step (Q1), of each of said macroblocks into dequantized macroblocks, -quantization (360) of said dequantized macroblocks with a second quantization step (Q2) into requantized macroblocks, and -entropycoding (370) of said requantized macroblocks into at least one part of a second bitstream (S2). It further comprises the following steps: -determine (310) a first function (F) linking the percentage of null coefficients in said batch and the coding cost of said batch, -determine (320) from the first function (F) the percentage of null coefficients, known as target percentage (ρ 2 ),corresponding to a predetermined coding cost (D2) for said batch, -determine (340) a second function associating, with each quantization step of the predetermined set, the percentage of null coefficients generated in said batch by quantizing with said quantization step each of the dequantized macroblocks of said batch, and -determine (350) the value of the second quantization step (Q2) from the second function and the target percentage (ρ 2 ).
    • 本发明涉及一种将代表图像序列的第一比特流(S1)的代码转换方法,代表第二比特流(S2),其包括以下步骤:将所述第一比特流(S1)的至少一个参数转换为 将每个所述宏块的至少一个宏块 - 具有第一量化步骤(Q1)的反量化(330)转换为反量化宏块,以及用第二量化步骤(Q2)的所述去量化宏块的量化(360) 到所述重新排序的宏块中,以及将所述重新排序的宏块的-entropycoding(370)转换成第二比特流的至少一部分(S2)。 它还包括以下步骤: - 确定(310)将所述批中的空系数的百分比与所述批次的编码成本相关联的第一函数(F), - 从第一函数(F)确定(320)百分比 与所述批次的预定编码成本(D2)相对应的,称为目标百分比(α2> 2N)的零系数,确定(340)与预定集合的每个量化步长相关联的第二函数 通过用所述量化步骤量化所述批次中的每个去量化宏块,并且从第二函数和目标百分比(350)确定(350)第二量化步长(Q2)的值,在所述批中生成的零系数的百分比 <?SUB> 2 )。