公开(公告)号：US07903873B2

公开(公告)日：2011-03-08

申请号：US11855075

申请日：2007-09-13

Applicant: Yan Lu ,  Feng Wu ,  Wenpeng Ding ,  Shipeng Li

Inventor： Yan Lu ,  Feng Wu ,  Wenpeng Ding ,  Shipeng Li

IPC: G06K9/36

CPC classification number: G06T9/00 ,  H04N1/644 ,  H04N19/12 ,  H04N19/124 ,  H04N19/136 ,  H04N19/176 ,  H04N19/186 ,  H04N19/61 ,  H04N19/91

Abstract: Textual image coding involves coding textual portions of an image. In an example embodiment, a textual block of an image is decomposed into multiple base colors and an index map, with the index map having index values that each reference a base color so as to represent the textual block. A set of neighbor index values are ascertained for a particular index of the index map. A context that matches the neighbor index values is generated from among multiple contexts. The matching context includes a set of symbols. At least one symbol-to-value mapping is determined based on the matching context and a symbol to which the particular index corresponds. The particular index is remapped to a particular value in accordance with the symbol-to-value mapping and the symbol to which the particular index corresponds.

Abstract translation: 文本图像编码涉及对图像的文本部分进行编码。 在示例实施例中，图像的文本块被分解为多个基色和索引图，索引图具有每个引用基色以便表示文本块的索引值。 确定索引图的特定索引的一组邻近索引值。 从多个上下文中生成匹配邻居索引值的上下文。 匹配的上下文包括一组符号。 基于匹配上下文和特定索引对应的符号来确定至少一个符号到值映射。 根据符号对值映射和特定索引对应的符号将特定索引重新映射到特定值。

公开(公告)号：US20070201751A1

公开(公告)日：2007-08-30

申请号：US11276342

申请日：2006-02-24

Applicant: Feng Wu ,  Bo Qin ,  Wenpeng Ding ,  Dong Liu ,  Jian Wang ,  Yuwen He ,  Zheng Ni

Inventor： Feng Wu ,  Bo Qin ,  Wenpeng Ding ,  Dong Liu ,  Jian Wang ,  Yuwen He ,  Zheng Ni

IPC: G06K9/36

CPC classification number: G06K9/00456 ,  H04N19/12 ,  H04N19/124 ,  H04N19/14 ,  H04N19/147 ,  H04N19/149 ,  H04N19/176 ,  H04N19/19 ,  H04N19/196

Abstract: Systems and methods for block-based fast image compression are described. In one aspect, a digital image is segmented into multiple blocks. A respective set of statistical characteristics is identified for each of the segmented blocks. Each of the blocks is encoded with a particular encoding algorithm of multiple encoding algorithms. The particular encoding algorithm that is used to encode a particular block segmented from the digital image is selected to efficiently encode the block in view of statistical characteristics associated with the block. Thus, blocks of different block types may be encoded with different encoding algorithms.

Abstract translation: 描述了基于块的快速图像压缩的系统和方法。 在一个方面，数字图像被分割成多个块。 针对每个分段块识别相应的一组统计特性。 每个块都用多种编码算法的特定编码算法进行编码。 选择用于编码从数字图像分割的特定块的特定编码算法，以便考虑到与块相关联的统计特性来有效地对块进行编码。 因此，不同块类型的块可以用不同的编码算法进行编码。

公开(公告)号：US07668382B2

公开(公告)日：2010-02-23

申请号：US11276342

申请日：2006-02-24

Applicant: Feng Wu ,  Bo Qin ,  Wenpeng Ding ,  Dong Liu ,  Jian Wang ,  Yuwen He ,  Zheng Ni

Inventor： Feng Wu ,  Bo Qin ,  Wenpeng Ding ,  Dong Liu ,  Jian Wang ,  Yuwen He ,  Zheng Ni

IPC: G06K9/36

CPC classification number: G06K9/00456 ,  H04N19/12 ,  H04N19/124 ,  H04N19/14 ,  H04N19/147 ,  H04N19/149 ,  H04N19/176 ,  H04N19/19 ,  H04N19/196

Abstract: Systems and methods for block-based fast image compression are described. In one aspect, a digital image is segmented into multiple blocks. A respective set of statistical characteristics is identified for each of the segmented blocks. Each of the blocks is encoded with a particular encoding algorithm of multiple encoding algorithms. The particular encoding algorithm that is used to encode a particular block segmented from the digital image is selected to efficiently encode the block in view of statistical characteristics associated with the block. Thus, blocks of different block types may be encoded with different encoding algorithms.

Abstract translation: 描述了基于块的快速图像压缩的系统和方法。 在一个方面，数字图像被分割成多个块。 针对每个分段块识别相应的一组统计特性。 每个块都用多种编码算法的特定编码算法进行编码。 选择用于编码从数字图像分割的特定块的特定编码算法，以便考虑到与块相关联的统计特性来有效地编码块。 因此，不同块类型的块可以用不同的编码算法进行编码。

公开(公告)号：US20090074307A1

公开(公告)日：2009-03-19

申请号：US11855075

申请日：2007-09-13

Applicant: Yan Lu ,  Feng Wu ,  Wenpeng Ding ,  Shipeng Li

Inventor： Yan Lu ,  Feng Wu ,  Wenpeng Ding ,  Shipeng Li

IPC: G06T9/00 ,  G06K9/36

CPC classification number: G06T9/00 ,  H04N1/644 ,  H04N19/12 ,  H04N19/124 ,  H04N19/136 ,  H04N19/176 ,  H04N19/186 ,  H04N19/61 ,  H04N19/91

Abstract: Textual image coding involves coding textual portions of an image. In an example embodiment, a textual block of an image is decomposed into multiple base colors and an index map, with the index map having index values that each reference a base color so as to represent the textual block. A set of neighbor index values are ascertained for a particular index of the index map. A context that matches the neighbor index values is generated from among multiple contexts. The matching context includes a set of symbols. At least one symbol-to-value mapping is determined based on the matching context and a symbol to which the particular index corresponds. The particular index is remapped to a particular value in accordance with the symbol-to-value mapping and the symbol to which the particular index corresponds.

Abstract translation: 文本图像编码涉及对图像的文本部分进行编码。 在示例实施例中，图像的文本块被分解为多个基色和索引图，索引图具有每个引用基色以便表示文本块的索引值。 确定索引图的特定索引的一组邻近索引值。 从多个上下文中生成匹配邻居索引值的上下文。 匹配的上下文包括一组符号。 基于匹配上下文和特定索引对应的符号来确定至少一个符号到值映射。 根据符号对值映射和特定索引对应的符号将特定索引重新映射到特定值。