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公开(公告)号:US4673987A
公开(公告)日:1987-06-16
申请号:US725970
申请日:1985-04-22
申请人: Kazuhara Toyokawa
发明人: Kazuhara Toyokawa
CPC分类号: H04N19/93
摘要: A coding process for a facsimile transmission system employs block coding and dither matrices of black and white picture elements, wherein each matrix represents a portion of a subject. The subject is scanned to provide gray-scale tone-level data, and the data of continuous tone regions of the subject is represented by standardized patterns in matrix form. A run of identical patterns is counted in the scanning direction and a symbol indicating the number of such repetitions is placed in the code in lieu of the succession of code words representing individual ones of the repeating patterns. A second symbol is inserted into the code to indicate a succession of runs of repeating patterns in the same column now positioned in two or more rows. The second symbol is utilized in lieu of a repetition of code words corresponding to each of the repeated patterns. The two symbols provide for two dimensional compression of the length of the message for improved efficiency of transmission of pictorial data between the subject and a display of an image of the subject.
摘要翻译: 用于传真传输系统的编码过程采用黑白图像元素的块编码和抖动矩阵,其中每个矩阵表示被摄体的一部分。 扫描被摄体以提供灰度级的音量数据,并且以矩阵形式的标准化图案表示被摄体的连续色调区域的数据。 在扫描方向上计算相同图案的运行,并且将代表这样的重复次数的符号放置在代码中,代替表示重复图案中的各个代码字的一系列代码。 第二个符号被插入到代码中,以指示现在位于两行或更多行中的同一列中重复模式的连续运行。 第二符号用于代替与每个重复模式相对应的码字的重复。 两个符号提供消息长度的二维压缩,以提高被摄体与被摄体的图像的显示之间的图形数据的传输效率。
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公开(公告)号:US06829367B1
公开(公告)日:2004-12-07
申请号:US09595222
申请日:2000-06-16
IPC分类号: G06K900
CPC分类号: G06T1/005 , G06F21/64 , G06T2201/0052 , G06T2201/0061 , G06T2201/0065
摘要: Content data is judged to determine whether data prepared by a digital device were altered by performing an authentication process using a medium on which content data are recorded; reading the content data from the medium; embedding, in the content data, data for verifying the pertinent content; extracting, from the content data, the data for verifying the pertinent contents; using the results of the extraction to determine whether the content data were altered. Preferably, the means includes means for identifying any portion containing altered data.
摘要翻译: 判断内容数据是否通过使用记录内容数据的介质执行认证处理来确定数字设备准备的数据是否被改变; 从媒体读取内容数据; 在内容数据中嵌入用于验证相关内容的数据; 从内容数据中提取用于验证相关内容的数据; 使用提取的结果来确定内容数据是否被改变。 优选地,装置包括用于识别包含改变的数据的任何部分的装置。
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