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    • 21. 发明授权
    • Decoding message data embedded in an image print via halftone dot orientation
    • 通过半色调点取向对嵌入在图像打印中的消息数据进行解码
    • US08014035B2
    • 2011-09-06
    • US12207718
    • 2008-09-10
    • Vishal MongaGaurav SharmaOrhan Bulan
    • Vishal MongaGaurav SharmaOrhan Bulan
    • H04N1/405G06T7/60G06K9/46G06K9/52G06K9/56B41M3/14
    • G06K1/121G06K2019/06234G06T1/005G06T2201/0051G06T2201/0061G06T2201/0065
    • What is disclosed is a novel system and method for encoding/decoding data in a cover contone image via halftone dot orientation modulation. Arrays of halftone threshold values are used to determine a desired orientation, e.g. 0/90°+/−45° for a given single data value of the original message to be embedded. Message data is embedded as a function of halftone dot orientation. Detection modeling of the print-scan process enables the determination of dot orientation from the image scan via statistically motivated image moments. A probabilistic model of the print-scan channel conditions received moments on input orientation. Density values of the received moments are used to determine dot orientation for each halftone cell. The embedded data is retrieved based on the determined orientations. The present method is applicable to areas of data embedding, document security, and the like.
    • 公开的是通过半色调点取向调制对覆盖连接图像中的数据进行编码/解码的新型系统和方法。 使用半色调阈值数组来确定期望的取向,例如, 对于要嵌入的原始消息的给定单个数据值,0/90°+/- 45°。 消息数据作为半色调点取向的函数进行嵌入。 打印扫描过程的检测建模使得能够通过统计动机的图像时刻从图像扫描确定点取向。 打印扫描通道条件的概率模型在输入方向上接收到力矩。 接收力矩的密度值用于确定每个半色调单元的点取向。 基于确定的取向检索嵌入数据。 本方法适用于数据嵌入,文档安全等领域。
    • 22. 发明授权
    • System and method of halftoning for multi-pass rendering
    • 用于多遍渲染的半色调系统和方法
    • US07719722B2
    • 2010-05-18
    • US10044468
    • 2002-01-11
    • Gaurav SharmaShen-ge WangZhigang Fan
    • Gaurav SharmaShen-ge WangZhigang Fan
    • G06K15/00H04N1/405B41J2/205
    • G06K15/107H04N1/4053
    • A system and method for halftoning for multi-pass rendering of an image in which different pixel locations are rendered in each pass which reduces the effects of inter-pass mis-registration errors. The method of halftoning includes restricting a substantial majority of the pixels turned on to render a tone to the minimum number of passes required to produce the tone. The halftoning method can include generating a stochastic halftone turn-on sequence and re-ordering the turn-on sequence. The halftoning method can also use error diffusion, adding a zero mean bias signal to either the image input pixels or the threshold values. The halftoning method is applicable to color or black and white rendering.
    • 用于半色调的系统和方法,用于在每次通过中渲染不同像素位置的图像的多遍渲染,其减少了通过间错误注册错误的影响。 半色调的方法包括将打开的大部分像素限制为产生音调所需的最小通过次数。 半色调方法可以包括产生随机半色调开启序列并重新排序开启序列。 半色调方法还可以使用误差扩散,向图像输入像素或阈值添加零平均偏置信号。 半色调方法适用于彩色或黑白渲染。