公开(公告)号：US07006663B2

公开(公告)日：2006-02-28

申请号：US10738741

申请日：2003-12-16

申请人： Tinku Acharya ,  Bhargab Bikram Bhattacharya ,  Malay Kumar Kundu ,  Suman Kumar Mitra ,  Chivukula Anjaneya Murthy

发明人： Tinku Acharya ,  Bhargab Bikram Bhattacharya ,  Malay Kumar Kundu ,  Suman Kumar Mitra ,  Chivukula Anjaneya Murthy

IPC分类号： G06K9/00

CPC分类号： G06T1/005 ,  G06T2201/0051 ,  G06T2201/0061 ,  G06T2201/0065 ,  G06T2201/0083 ,  H04N1/32149 ,  H04N1/32208 ,  H04N1/32229

摘要： A method of encoding a watermark into a digital image. The method includes partitioning an original image into blocks and then determining a variance value of each block. The blocks are then arranged according to the variance values. A number of selected blocks are identified, where the number depends upon the size of the watermark. The blocks selected are then arranged by their location. Data from the watermark is used to replace bits in a representation of each of the selected blocks with data from the watermark. A method of decoding is also discussed.

公开(公告)号：US06738520B1

公开(公告)日：2004-05-18

申请号：US09597354

申请日：2000-06-19

申请人： Tinku Acharya ,  Bhargab Bikram Bhattacharya ,  Malay Kumar Kundu ,  Suman Kumar Mitra ,  Chivukula A. Murthy

发明人： Tinku Acharya ,  Bhargab Bikram Bhattacharya ,  Malay Kumar Kundu ,  Suman Kumar Mitra ,  Chivukula A. Murthy

IPC分类号： G06K936

CPC分类号： G06T9/001

摘要： Several embodiments in accordance with the invention are disclosed. An embodiment for compressing a gray scale image is described and an embodiment for decompressing the codebook produced by compressing the gray scale image is described. Of course, the invention is not limited to only gray scale images, however.

摘要翻译： 公开了根据本发明的几个实施例。 描述了用于压缩灰度图像的实施例，并且描述了用于解压缩通过压缩灰度图像产生的码本的实施例。 当然，本发明并不仅限于灰度图像。

公开(公告)号：US06707928B2

公开(公告)日：2004-03-16

申请号：US09727288

申请日：2000-11-29

申请人： Tinku Acharya ,  Bhargab Bikram Bhattacharya ,  Malay Kumar Kundu ,  Suman Kumar Mitra ,  Chivukula Anjaneya Murthy

发明人： Tinku Acharya ,  Bhargab Bikram Bhattacharya ,  Malay Kumar Kundu ,  Suman Kumar Mitra ,  Chivukula Anjaneya Murthy

IPC分类号： G06K900

CPC分类号： G06T1/005 ,  G06T2201/0051 ,  G06T2201/0061 ,  G06T2201/0065 ,  G06T2201/0083 ,  H04N1/32149 ,  H04N1/32208 ,  H04N1/32229

摘要： A method of encoding a watermark into a digital image. The method includes partitioning an original image into blocks and then determining a variance value of each block. The blocks are then arranged according to the variance values. A number of selected blocks are identified, where the number depends upon the size of the watermark. The blocks selected are then arranged by their location. Data from the watermark is used to replace bits in a representation of each of the selected blocks with data from the watermark. A method of decoding is also discussed.