公开(公告)号：EP1445734A1

公开(公告)日：2004-08-11

申请号：EP03002728.8

申请日：2003-02-06

Applicant: STMicroelectronics S.r.l.

Inventor： Gardella, Pierluigi Michele ,  Barone, Massimiliano ,  Alfonso, Daniele ,  Pau, Danilo Pietro ,  Lavigna, Daniele

IPC: G06T9/00

CPC classification number: G06T9/005

Abstract: A method for texture compressing images having a plurality of color components (R, G, B), includes the step of decomposing the images in sub-blocks each including only one color component. At least one first predictor is defined for each said sub-block and a respective set of prediction differences is computed for each sub-block. Then the prediction differences for each sub block are sorted, and a look-up prediction differences palette is set up by defining therefrom a look-up prediction error palette. A code is associated with each column of the error palette.

Abstract translation: 一种用于对具有多个颜色分量（R，G，B）的图像进行纹理压缩的方法包括在每个仅包括一个颜色分量的子块中分解图像的步骤。 为每个所述子块定义至少一个第一预测器，并为每个子块计算相应的一组预测差异。 然后对每个子块的预测差异进行排序，并且通过定义查找预测误差调色板来建立查找预测差异调色板。 代码与错误调色板的每一列相关联。

公开(公告)号：EP1445734B1

公开(公告)日：2007-08-08

申请号：EP03002728.8

申请日：2003-02-06

Applicant: STMicroelectronics S.r.l.

Inventor： Gardella, Pierluigi Michele ,  Barone, Massimiliano ,  Alfonso, Daniele ,  Pau, Danilo Pietro ,  Lavigna, Daniele

IPC: G06T9/00

CPC classification number: G06T9/005

公开(公告)号：EP1443461B1

公开(公告)日：2006-11-02

申请号：EP03002205.7

申请日：2003-01-31

Applicant: STMicroelectronics S.r.l.

Inventor： Barone, Massimiliano ,  Vitali, Andrea ,  Pau, Danilo Pietro ,  Sirtori, Daniele ,  Lavigna, Daniele ,  Gardella, Pierluigi

IPC: G06T9/00

CPC classification number: G06T9/005

公开(公告)号：EP1443461A1

公开(公告)日：2004-08-04

申请号：EP03002205.7

申请日：2003-01-31

Applicant: STMicroelectronics S.r.l.

Inventor： Barone, Massimiliano ,  Vitali, Andrea ,  Pau, Danilo Pietro ,  Sirtori, Daniele ,  Lavigna, Daniele ,  Gardella, Pierluigi

IPC: G06T9/00

CPC classification number: G06T9/005

Abstract: A method for texture compressing images having a plurality of color components (R, G, B) includes the step of defining color representatives for use in encoding by defining groups of colors for each said color component (R,G,B), and selecting for each said group a representative color for the group, the median color being chosen as the representative color of the group. Each said group is preferably composed of 3 to 15 colors and the method includes the step of computing, for each group, an error between each member of the group and said representative color of the group. Typically, the error is computed as the sum of the absolute differences (SAD) between each member of the group and said representative color of the group. In order to select each said group and then extract therefrom said representative color, a criterium is used selected from the group consisting of:

selecting the group that minimizes said error by assuming each group comprised of the lower colors sorted in ascending order, wherein the same applies for the groups comprised of the higher colors,
accruing the error as computed separately for two groups in all possible combinations and finding the minimum of the composite error.

Abstract translation: 用于纹理压缩具有多个颜色分量（R，G，B）的图像的方法包括通过为每个所述颜色分量（R，G，B）定义颜色组来定义用于编码的颜色代表的步骤，以及选择 对于每个所述组，该组的代表颜色，中间颜色被选择为该组的代表颜色。 每个所述组优选地由3至15种颜色组成，并且该方法包括以下步骤：针对每个组计算组的每个成员与组的所述代表颜色之间的误差。 通常，误差被计算为组的每个成员与组的所述代表颜色之间的绝对差（SAD）之和。 为了选择每个所述组，然后从其中提取所述代表性颜色，使用选自以下的标准：选择通过假设由按升序排列的较低颜色组成的每个组，使所述误差最小化的组，其中相同 适用于由较高颜色组成的组，在所有可能的组合中分别计算出两组的误差，并找出复合误差的最小值。