公开(公告)号：EP1566957B1

公开(公告)日：2007-09-26

申请号：EP04425101.5

申请日：2004-02-18

Applicant: STMicroelectronics S.r.l. ,  STMicroelectronics Limited

Inventor： Gardella, Pier Luigi ,  Barone, Massimiliano ,  Sweet, Gary ,  Pau, Danilo ,  Hill, Stephen ,  Goda, Simon

IPC: H04N1/41 ,  H04N1/64 ,  G06T3/40 ,  H04N7/26 ,  G09G5/02

CPC classification number: H04N19/00 ,  G09G3/2051 ,  G09G5/02 ,  H04N1/40087 ,  H04N19/42 ,  H04N19/90

公开(公告)号：EP1566957A1

公开(公告)日：2005-08-24

申请号：EP04425101.5

申请日：2004-02-18

Applicant: STMicroelectronics S.r.l. ,  STMicroelectronics Limited

Inventor： Gardella, Pier Luigi ,  Barone, Massimiliano ,  Sweet, Gary ,  Pau, Danilo ,  Hill, Stephen ,  Goda, Simon

IPC: H04N1/41 ,  H04N1/64 ,  G06T3/40 ,  H04N7/26 ,  G09G5/02

CPC classification number: H04N19/00 ,  G09G3/2051 ,  G09G5/02 ,  H04N1/40087 ,  H04N19/42 ,  H04N19/90

Abstract: A dither matrix is applied to a high-resolution image to compare the value of each of the pixels that compose it with a threshold value of the matrix and to obtain an output value of the matrix (Dither matrix value) from each comparison. To each pixel value (in_value_r) of the image there is applied the algorithm represented by the schematic layout of Figure 7 to obtain the pixel values (Out_r) of a low-resolution image. C 1 -C 5 and n 1 -n 10 are parameters that may be selected by means of predetermined criteria based on comparisons of the low-resolution image, obtained by means of the operations described above, with an equivalent low-resolution image obtained by means of a sample method.

Abstract translation: 将抖动矩阵应用于高分辨率图像，以将构成它的每个像素的值与矩阵的阈值进行比较，并从每个比较中获得矩阵（抖动矩阵值）的输出值。 对于图像的每个像素值（in_value_r），应用由图7的原理图布局表示的算法，以获得低分辨率图像的像素值（Out_r）。 C1-C5和n1-n10是可以通过基于通过上述操作获得的低分辨率图像与通过样本获得的等效低分辨率图像的比较的预定标准来选择的参数 方法。

公开(公告)号：EP1515278B1

公开(公告)日：2007-02-28

申请号：EP03425590.1

申请日：2003-09-11

Applicant: STMicroelectronics S.r.l.

Inventor： Poutet, Bruno ,  Barone, Massimiliano ,  Gardella, Pier Luigi ,  Pau, Danilo

IPC: G06T9/00

CPC classification number: H04N19/90

公开(公告)号：EP1515278A1

公开(公告)日：2005-03-16

申请号：EP03425590.1

申请日：2003-09-11

Applicant: STMicroelectronics S.r.l.

Inventor： Poutet, Bruno ,  Barone, Massimiliano ,  Gardella, Pier Luigi ,  Pau, Danilo

IPC: G06T9/00

CPC classification number: H04N19/90

Abstract: Digital video signals, such as RGB signals, are subjected to processing by ordering the pixels into groups (M) of adjacent pixels (A, B, C, D) and carrying out the operations of:

- i) truncating the respective string of bits, eliminating a given number (n) of least-significant bits, thus generating a respective truncated string;
- ii) adding to the truncated string an integration factor constituted by a power of two of a given order, thus generating a respective integrated string; and
- iii) calculating first and second values of pixel error corresponding to the difference between the respective string and the truncated string and the respective string and the integrated string, respectively.

There is calculated a set of values of global error comprising all the possible combinations of addition of the first and second values of pixel error on the group (M), then locating the value of minimum error in the set of values of global error. Once, in the combination that produces the value of minimum global error, a first and a second number of pixels have been identified whereby the contribution to the value of minimum global error is given by the first value of pixel error and by the second value of pixel error, as a compressed version of the video signals represented by the pixels in the group, there is used a first number of truncated strings and a second number of integrated strings, equal, respectively, to the first number of pixels and to the second number of pixels, with the integrated strings subjected to truncation.

Abstract translation: 数字视频信号（例如RGB信号）通过将像素排列成相邻像素（A，B，C，D）的组（M）进行处理，并执行以下操作：i）截断各个位串 ，消除给定数量（n）个最低有效位，从而产生相应的截断串; - ii）向截断的串中添加由给定次序的两个的幂组成的积分因子，从而生成相应的集成串; 以及 - iii）分别计算与各个字符串和截断的字符串以及相应的字符串和集成字符串之间的差分对应的像素误差的第一和第二值。 计算出一组全局误差的值，包括在组（M）上的像素误差的第一和第二值的相加的所有可能组合，然后将最小误差的值定位在 全局错误。 一旦产生最小全局误差的值的组合中，已经识别出第一和第二数量的像素，由此对最小全局误差值的贡献由像素误差的第一值和第 作为由组中的像素表示的视频信号的压缩版本的像素误差，分别使用第一数量的截断字符串和第二数量的集成字符串，分别等于第一数量的像素和第二数量的像素 像素数，集成的字符串被截断。