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    • 1. 发明申请
    • ULTRA-BROADBAND OFFSET CASSEGRAIN DICHROIC ANTENNA SYSTEM FOR BIDIRECTIONAL SATELLITE SIGNAL COMMUNICATION
    • 超宽带无线遥控卫星天线系统双向卫星信号通信
    • US20140225796A1
    • 2014-08-14
    • US13762402
    • 2013-02-08
    • Chien-An ChenLinda Chen
    • Chien-An ChenLinda Chen
    • H01Q15/00
    • H01Q15/0033H01Q5/45H01Q19/132H01Q19/192
    • An ultra-wide bandwidth multi-channel offset Cassegrain dichroic antenna system serves for bidirectional signal transmission between a ground-based system and at least one satellite. By properly selecting the high and low frequency band, ultra wide bandwidths for both high and low frequency band signals are provided. The band widths are about 15%, even up-to 50%, of the carrier frequency. Especially, the band widths for high frequency band signals are much wider than that for low frequency band signals. The low frequency band can be from 10.7 up-to 12.75 GHz while the high frequency band can be from 17 up-to 30 GHz. Furthermore, in order to achieve ultra-wide bandwidth, a surface of a dichroic sub-dish is divided into a plurality of unit areas. Arrangements of the metal dichroic element of one unit area are slightly different from another unit area f, while the metal elements on same unit area are identical.
    • 超宽带宽多通道偏移卡塞格伦二向色天线系统用于地面系统与至少一颗卫星之间的双向信号传输。 通过适当选择高频和低频带,提供高频和低频信号的超宽带宽。 带宽约为载波频率的15%,甚至高达50%。 特别地,高频带信号的带宽比低频带信号宽。 低频带可以是10.7到12.75GHz,而高频带可以是从17到高达30GHz。 此外,为了实现超宽带宽,二向色子盘的表面被分成多个单位区域。 一个单位面积的金属二向色元件的布置与另一个单位面积f略有不同,而同一单位面积上的金属元素是相同的。
    • 2. 发明授权
    • Efficient method of image compression comprising a low resolution image in the bit stream
    • 图像压缩的有效方法包括比特流中的低分辨率图像
    • US06259819B1
    • 2001-07-10
    • US09055316
    • 1998-04-06
    • James Philip AndrewLinda Chen
    • James Philip AndrewLinda Chen
    • G06K936
    • G06T9/007G06T3/4084
    • A method of providing a thumbnail-size colour digital image in a bit stream of a larger size colour digital image is disclosed. The bit stream of the larger digital image is typically in a compressed format, and includes a thumbnail size image in a substantially uncompressed format. The method includes converting input colour values of the larger colour image from a first colour format to corresponding values in a Luminance, Chrominance-blue, Chrominance-red (Y,Cb,Cr) colour format, A transform is then applied to said corresponding values to decompose the larger digital image into a DC subband and one or more higher frequency subbands. Typically the transform is a discrete wavelet transform. The DC subband is then output to the bit stream in an uncompressed format. Then at least one of the one or more higher frequency subbands is encoded into the bit stream in a substantially compressed format. The DC subband thus represents a thumbnail-size colour digital image in the bit stream.
    • 公开了一种在较大尺寸彩色数字图像的比特流中提供缩略图大小的彩色数字图像的方法。 较大数字图像的比特流通常为压缩格式,并且包括基本上未压缩格式的缩略图大小图像。 该方法包括将较大彩色图像的输入颜色值从第一颜色格式转换为亮度,色度 - 蓝色,色度 - 红色(Y,Cb,Cr)颜色格式的相应值,然后将A变换应用于所述对应值 将较大的数字图像分解成DC子带和一个或多个较高频率子带。 通常,变换是离散小波变换。 然后将DC子带以未压缩格式输出到比特流。 然后,一个或多个更高频率子带中的至少一个以基本上压缩的格式被编码到比特流中。 DC子带因此表示比特流中的缩略图大小的彩色数字图像。