公开(公告)号：US07450774B2

公开(公告)日：2008-11-11

申请号：US10126981

申请日：2002-04-22

Applicant: Cheul-hee Hahm ,  Jae Moon Jo

Inventor： Cheul-hee Hahm ,  Jae Moon Jo

IPC: G06K9/00 ,  G06K9/36 ,  G06K9/46 ,  H04N1/41 ,  H04N1/413

CPC classification number: H04N5/9264 ,  H04N19/152 ,  H04N19/18 ,  H04N19/40 ,  H04N19/48 ,  H04N19/61 ,  H04N19/91

Abstract: An apparatus and a method of changing a bit rate of a compressed image bit stream by changing a codeword so as to easily change the bit rate and reduce a changing loss. The apparatus for changing a bit rate, in which an input bit stream generated by an image compression encoding method is changed into an output bit stream having a desired bit rate, includes a changing codeword determiner which selects codewords to replace the codewords of the input bit stream, and a codeword changer which changes the codewords of the input bit stream into the codewords selected by the changing codeword determiner. The method and the apparatus can be applied to image services provided through the Internet and receiving apparatuses supporting the Personal Video Recorder (PVR) function. Particularly, the method of changing the bit rate of a compressed image bit stream changes the codewords of input transform coefficients so as to easily change the bit rate and reduce the changing loss.

Abstract translation: 通过改变码字来改变压缩图像比特流的比特率以便容易地改变比特率并减少变化的损耗的装置和方法。 用于改变比特率的装置，其中通过图像压缩编码方法生成的输入比特流被改变为具有期望比特率的输出比特流，包括改变码字确定器，其选择码字来替换输入比特的码字 流和码字改变器，其将输入比特流的码字改变为由改变的码字确定器选择的码字。 该方法和装置可以应用于通过互联网提供的图像服务和支持个人录像机（PVR）功能的接收装置。 特别地，改变压缩图像比特流的比特率的方法改变输入变换系数的码字，以便容易地改变比特率并减少变化的损耗。

公开(公告)号：US20080025503A1

公开(公告)日：2008-01-31

申请号：US11730473

申请日：2007-04-02

Applicant: Yun-ho Choi ,  Cheul-hee Hahm ,  Chang-yong Heo

Inventor： Yun-ho Choi ,  Cheul-hee Hahm ,  Chang-yong Heo

IPC: H04K1/00

CPC classification number: H04L9/0861 ,  H04L9/3226 ,  H04L9/3236

Abstract: A security method and a security apparatus are disclosed which use a self-generated encryption key. The security method includes the steps of: generating an encryption key; decrypting pre-encrypted data using a pre-stored manufacturer key; and re-encrypting the decrypted data using the encryption key. The security method and apparatus minimize external leakage of data by self-generating the unique encryption key. Since the encryption keys are unique in each set, set binding is possible.

Abstract translation: 公开了一种使用自生产加密密钥的安全方法和安全装置。 该安全方法包括以下步骤：生成加密密钥; 使用预先存储的制造商密钥解密预先加密的数据; 并使用加密密钥重新加密解密的数据。 安全方法和装置通过自生成唯一的加密密钥来最小化数据的外部泄漏。 由于加密密钥在每个集合中是唯一的，所以设置绑定是可能的。