Digital modulation apparatus, a digital modulation method, and a
recording medium therefor
    3.
    发明授权
    Digital modulation apparatus, a digital modulation method, and a recording medium therefor 失效
    数字调制装置,数字调制方法及其记录介质

    公开(公告)号:US5917857A

    公开(公告)日:1999-06-29

    申请号:US764024

    申请日:1996-12-11

    CPC分类号: H03M5/145 G11B20/1426

    摘要: A digital modulation apparatus applies a method for converting data words to runlength-limited code words using plural conversion tables. The data words are converted to code words that significantly suppress the low frequency component of the final nonreturn-to-zero inverted signal.This digital modulation apparatus includes ROM tables for storing plural conversion tables containing the runlength-limited code words corresponding to the data words; end-runlength memories and evaluators for determining whether the runlength-limit constraints are satisfied in the interconnection between two consecutive code words when the data words to be converted are supplied; and a DSV controller for storing each of the code words that can be selected from two conversion tables to buffer memories when the runlength-limit constraints are satisfied, and selecting the code words wit the greatest effect suppressing the low frequency component in the obtained signal when the code words are NRZI converted.

    摘要翻译: 数字调制装置应用一种使用多个转换表将数据字转换成游程长度限制码字的方法。 数据字被转换成显着抑制最终的非归零到反相信号的低频分量的码字。 该数字调制装置包括用于存储包含对应于数据字的游程限制码字的多个转换表的ROM表; 终端游程长度存储器和评估器,用于在提供要转换的数据字时确定在两个连续码字之间的互连中是否满足游程限制约束; 以及DSV控制器,用于当满足游程长度限制约束时,将可从两个转换表中选择的每个代码字存储到缓冲存储器,并且选择在获得的信号中抑制低频分量的最大效应的代码字, 代码字被NRZI转换。

    Control method and apparatus for embedding information in data
    4.
    发明授权
    Control method and apparatus for embedding information in data 有权
    用于在数据中嵌入信息的控制方法和装置

    公开(公告)号:US06711276B1

    公开(公告)日:2004-03-23

    申请号:US09453578

    申请日:1999-12-03

    IPC分类号: G06K900

    摘要: A watermark information embedding method, and apparatus, capable of suppressing the quality degradation of contents and increasing the survivability of embedded information. When embedding watermark information in moving picture data formed of a plurality of still picture frames arranged in time series, a motion vector representing a property specific to moving picture is detected for each of image blocks generated by dividing a target frame. According to a motion quantity, a pixel change factor specifying rule is selected for each block. Out of pixels permitted to be changed in luminance depending upon the state of an image in each block representing a property specific to still picture, as many pixels as a number specified by the selected rule are selected. Luminance change processing for forming watermark information is conducted on the selected pixels.

    摘要翻译: 一种水印信息嵌入方法和装置,其能够抑制内容的质量劣化并增加嵌入信息的生存性。 当将水印信息嵌入由以时间序列排列的多个静止图像帧形成的运动图像数据中时,针对通过划分目标帧而产生的每个图像块检测表示运动图像特有的属性的运动矢量。 根据运动量,为每个块选择像素变化因子指定规则。 根据表示静止图像特有的属性的每个块中的图像的状态,亮度允许变化的像素的数量被选择为与所选择的规则指定的数量一样多的像素。 对所选择的像素进行用于形成水印信息的亮度变化处理。

    Digital watermark image processing method
    7.
    发明授权
    Digital watermark image processing method 有权
    数字水印图像处理方法

    公开(公告)号:US06584210B1

    公开(公告)日:2003-06-24

    申请号:US09274103

    申请日:1999-03-23

    IPC分类号: G06K900

    摘要: An image processing apparatus having an adding unit to add information by changing a data value of image data and a detecting unit to detect the information added to the image data. In a digital watermark image processing method in the image processing apparatus, filter passage image data is formed by performing an image filtering process to original image data, watermark core image data is formed by performing a process to obtain a difference between the filter passage image data and the original image data, change amount image data is formed by performing a process to obtain a value to change the data value of the image data on the basis of the watermark core image data and desired information to be added, and watermark inserted image data is formed by performing a process to add the original image data and the change amount image data.

    摘要翻译: 一种图像处理装置,具有通过改变图像数据的数据值来添加信息的添加单元和检测附加到图像数据的信息的检测单元。 在图像处理装置中的数字水印图像处理方法中,通过对原始图像数据进行图像滤波处理来形成滤波器通过图像数据,通过执行获得滤波器通过图像数据之间的差异的处理来形成水印核心图像数据 并且通过执行基于水印核心图像数据和期望的要添加的信息来获得改变图像数据的数据值的处理来形成原始图像数据,改变量图像数据,以及水印插入图像数据 通过执行添加原始图像数据和变化量​​图像数据的处理来形成。

    Receiving device, recording and reproducing device and receiving/recording-reproducing system for digital broadcast signal
    10.
    发明授权
    Receiving device, recording and reproducing device and receiving/recording-reproducing system for digital broadcast signal 失效
    用于数字广播信号的接收装置,记录和再现装置以及接收/记录再现系统

    公开(公告)号:US06674858B1

    公开(公告)日:2004-01-06

    申请号:US09208443

    申请日:1998-12-10

    IPC分类号: H04N7167

    摘要: A receiving device comprises a signal demodulator circuit for demodulating an encrypted video signal and attribute information including information for decoding an encryption, an attribute information identifying circuit for identifying and outputting the attribute information, and a descramble circuit for unscrambling the video signal obtained from the signal demodulator circuit, based on the output produced from the attribute information identifying circuit. A signal re-scrambled in accordance with a device ID signal is recorded in a recording and reproducing device. Further, the recording of the signal is controlled based on the output obtained from the attribute information identifying circuit.

    摘要翻译: 接收装置包括用于解调加密视频信号的信号解调器电路和包括用于解码加密的信息的属性信息,用于识别和输出属性信息的属性信息识别电路,以及用于对从信号获得的视频信号进行解扰的解扰电路 解调器电路,基于从属性信息识别电路产生的输出。 根据设备ID信号重新加扰的信号被记录在记录和再现设备中。 此外,基于从属性信息识别电路获得的输出来控制信号的记录。