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    • 2. 发明申请
    • STEGOTEXT ENCODER AND DECODER
    • STEGOTEXT编码器和解码器
    • US20080152128A1
    • 2008-06-26
    • US11869507
    • 2007-10-09
    • Roger Fane SewellMark St.John OwenStephen John BarlowSimon Paul Long
    • Roger Fane SewellMark St.John OwenStephen John BarlowSimon Paul Long
    • H04L9/28H04L17/14G06F17/16G06F17/10
    • H04H20/31G06T1/0028G06T1/005G06T2200/28G06T2201/0052G06T2201/0065G10L19/018
    • The invention comprises an encoder for encoding a stegotext and a decoder for decoding the encoded stegotext, the stegotext being generated by modulating the log power spectrogram of a covertext signal with at least one key, the or each key having been added or subtracted in the log domain to the covertext power spectrogram in accordance with the data of the watermark code with which the stegotext was generated, and the modulated power spectrogram having been returned into the original domain of the covertext. The decoder carries out Fast Fourier Transformation and rectangular polar conversion of the stegotext signal so as to transform the stegotext signal into the log power spectrogram domain; subtracts in the log power domain positive and negative multiples of the key or keys from blocks of the log power spectrogram and evaluates the probability of the results of such subtractions representing an unmodified block of covertext in accordance with a predetermined statistical model.
    • 本发明包括一个编码器,用于对一个熟悉的编码器和一个解码器进行编码,该编码器通过用至少一个键调制覆盖文本信号的对数功率谱图来生成,该信号是通过在日志中被加或减 根据生成了嘟嘟声的水印码的数据,将调制后的功率谱图返回到覆盖文本的原始域。 解码器执行快速傅里叶变换和stegotext信号的矩形极化转换,以将stegotext信号转换成对数功率谱图域; 从对数功率谱图的块中减去对数功率域的键或键的正负的倍数,并根据预定的统计模型来评估表示未修改的覆盖文本块的这种减法的结果的概率。
    • 7. 发明授权
    • Method and apparatus for wireless image transmission to a projector
    • 用于无线图像传输到投影仪的方法和装置
    • US07905604B2
    • 2011-03-15
    • US11708780
    • 2007-02-20
    • David Elliott SlobodinRob HoeyeJorell A. OlsonPaul LongMarques Ronald GirardelliJoshua Duffy
    • David Elliott SlobodinRob HoeyeJorell A. OlsonPaul LongMarques Ronald GirardelliJoshua Duffy
    • G03B21/56G03B23/00G09G5/00G06F15/173G06F3/00G06F15/177H04H40/00H04B1/18
    • G09G5/363G06F3/1415G06F3/1423G06T9/008G09G2370/16H04N1/00103H04N1/00281H04N1/00291H04N1/00315H04N1/4177H04N21/4122H04N21/4143H04N21/43615H04N21/43637H04N21/440218H04N21/485
    • A method and apparatus is provided in which a digital image is transmitted to a presentation projector resource over a wireless transmission medium using a reduced amount of transmission bandwidth by transmitting a subset of the digital image data. The subset image data may be a delta subset that represents those areas of the image that have changed since the previous transmission. The subset image data may also be a scalable vector graphics representation of the subset of the digital image. Header data is provided to further describe the subset image data. A projector discovery logic selects a suitable projector resource based on the order or signal strength of the discovery replies. A wireless image transmission session is established with the selected projector resource during which the projector is unavailable to other devices. The subset image data may be compressed and transmission coordinated with the projector resource so that the data is sent only when it is ready to be received. A wireless to digital visual interface (DVI) graphics engine decompresses and renders the image for output to a DVI connector receptacle. The rendered image is projected by the projector resource in accordance with the associated header data so that the exact image that appears on the image generation device also appears on the projected display.
    • 提供了一种方法和装置,其中通过发送数字图像数据的子集,通过使用减少的传输带宽量将数字图像通过无线传输介质发送到演示投影仪资源。 子集图像数据可以是表示自先前传输以来已经改变的图像的那些区域的增量子集。 子集图像数据还可以是数字图像的子集的可缩放矢量图形表示。 提供标题数据以进一步描述子集图像数据。 投影仪发现逻辑根据发现回复的顺序或信号强度来选择合适的投影机资源。 使用所选投影机资源建立无线图像传输会话,在该投影机资源期间投影机对其他设备不可用。 子集图像数据可以被压缩并且与投影机资源协调传输,使得数据仅在准备好被接收时被发送。 无线数字视频接口(DVI)图形引擎解压缩并呈现图像以输出到DVI连接器插座。 渲染的图像由投影机资源根据相关联的标题数据投影,使得出现在图像生成装置上的精确图像也出现在投影显示器上。