公开(公告)号：EP1843587A1

公开(公告)日：2007-10-10

申请号：EP06425235.6

申请日：2006-04-05

Applicant: STMicroelectronics S.r.l.

Inventor： Alfonso, Daniele ,  Bagni, Daniele ,  Rovati, Fabrizio

IPC: H04N7/01

CPC classification number: H04N7/014 ,  H04N7/0105

Abstract: In a method for converting an input video sequence (SV), comprising digital images (305, 305') organized in frames and operating at a variable frame-rate (v), into an output video sequence (SC), operating at a preset constant frame-rate (c), it is envisaged to store (215) the input video sequence (SV) temporarily and to control fetching of images (305, 305') of said temporarily stored input video sequence (SV). The invention moreover envisages:
controlling (220) fetching of images (305, 305') from the temporarily stored input video sequence (SV) by adjusting an emptying rate (f) to form an intermediate video sequence (SF); and
carrying out an operation of motion-compensated interpolation (225) on the intermediate video sequence (SF) to form the output video sequence (SC) operating at a pre-set constant frame-rate (c), the emptying rate (f) being adjusted (220) as a function of a number (b; b1) of images of the input video sequence (SV) with variable frame-rate (v) temporarily stored (b; b1).
Preferential application is in the reproduction of video sequences in mobile terminals, with the capacity of audio-video conversation, for example for videoconferences.

Abstract translation: 一种用于转换输入视频序列（SV）的方法，包括以帧组织并以可变帧速率（v）操作的数字图像（305,305'）转换成输出视频序列（SC），在预设 恒定帧率（c），设想临时存储（215）输入视频序列（SV）并控制所述临时存储的输入视频序列（SV）的图像（305,305'）的获取。 本发明还设想：通过调节排空速率（f）来控制（220）从临时存储的输入视频序列（SV）中提取图像（305,305'）以形成中间视频序列（SF）; 并且在中间视频序列（SF）上执行运动补偿内插（225）的操作以形成以预定的恒定帧速率（c）操作的输出视频序列（SC），排空速率（f） 作为临时存储（b; b1）的可变帧速率（v）的输入视频序列（SV）的图像数（b; b1）的函数被调整（220）。 优先应用在移动终端中的视频序列的再现中，具有音频 - 视频对话的能力，例如用于视频会议。

公开(公告)号：EP1370086A1

公开(公告)日：2003-12-10

申请号：EP02425372.6

申请日：2002-06-07

Applicant: STMicroelectronics S.r.l.

Inventor： Alfonso, Daniele ,  Rovati, Fabrizio

IPC: H04N7/26

CPC classification number: H04N19/43 ,  H04N19/51 ,  H04N19/56

Abstract: A system for generating motion vectors (MV) in the framework of a motion estimator is configured for co-operating with an engine for calculating estimation error for generating motion vectors (MV), according to estimation errors and/or motion vectors previously generated. The system comprises a program memory (40), which is able to contain program data for a motion-estimation algorithm to be executed, as well as a motion-vector memory (42), which is able to contain data identifying said motion vectors previously calculated. The system further comprises an arithmetic and logic unit (46) co-operating with the aforesaid program memory (40) and motion-vector memory (42), with the possibility of generating motion vectors (MV) in a programmable way so as to get them to correspond, for example, to predictors deriving from motion-estimation operations already performed on the macroblocks of the reference frame or on the previous macroblocks of the current frame, as updates calculated using the coordinates of the motion vectors already issued for the current macroblock, or again as absolute motion vectors, generated as such, taking the components directly from the program code.

Abstract translation: 在运动估计器的框架内用于产生运动矢量（MV）的系统被配置用于根据先前产生的估计误差和/或运动矢量与用于计算用于产生运动矢量（MV）的估计误差的发动机进行协作。 该系统包括能够包含要执行的运动估计算法的程序数据的程序存储器（40）以及能够包含先前识别所述运动矢量的数据的运动矢量存储器（42） 计算。 该系统还包括与上述程序存储器（40）和运动矢量存储器（42）配合的算术和逻辑单元（46），具有以可编程的方式生成运动矢量（MV）以便获得 它们例如对应于已经对参考帧的宏块或当前帧的先前宏块执行的运动估计操作的预测器，作为使用已经为当前宏块发出的运动矢量的坐标计算的更新 ，或者再次作为绝对运动矢量，直接从程序代码获取组件。

公开(公告)号：EP1231794A1

公开(公告)日：2002-08-14

申请号：EP01830227.3

申请日：2001-03-30

Applicant: STMicroelectronics S.r.l.

Inventor： Pau, Danilo ,  Alfonso, Daniele ,  Basso, Fabrizio ,  Piccinelli, Emiliano ,  Cremonesi, Alessandro

IPC: H04N7/26

CPC classification number: H04N19/59 ,  H04N19/40 ,  H04N19/48 ,  H04N19/90

Abstract: A process and a system for generating, starting from an MPEG input bitstream (IS), an MPEG output bitstream (OS), the output bitstream (OS) having a resolution (Hor/N x Vert/M) modified with respect to the resolution (Hor x Vert) of the input bitstream (IS). The process comprises the operations of:

distinguishing (100), in the input bitstream (IS), first portions and second portions which respectively substantially do not affect and do affect the variation of resolution; and
subjecting (114 to 122) said second portions of the input bitstream (IS) to a function of modification of the resolution obtained by filtration in the domain of the discrete cosine transform (DCT), and then transferring (134), to said output bitstream (OS), said second portions subjected to filtering in the domain of the discrete cosine transform.

The invention also relates to the corresponding computer program product.

Abstract translation: 用于从MPEG输入比特流（IS），MPEG输出比特流（OS）开始生成具有相对于分辨率修改的分辨率（Hor / N×Vert / M）的输出比特流（OS）的处理和系统 （Hor×Vert）的输入比特流（IS）。 该过程包括以下操作：在输入比特流（IS）中区分（100）分别基本上不影响并且确实影响分辨率变化的第一部分和第二部分; 并且输入比特流（IS）的所述第二部分（114至122）具有通过在离散余弦变换（DCT）的域中通过滤波获得的分辨率的修改的功能，然后将（134）传送到所述输出 比特流（OS），所述第二部分在离散余弦变换的域中进行滤波。 本发明还涉及相应的计算机程序产品。