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    • 6. 发明授权
    • Method and circuit for two-dimensional discrete cosine transform
    • 二维离散余弦变换的方法和电路
    • US5257213A
    • 1993-10-26
    • US707859
    • 1991-05-30
    • Gye-Jong KimSang-Yook LeeNam-Ik Cho
    • Gye-Jong KimSang-Yook LeeNam-Ik Cho
    • G06F17/14G06F7/38
    • G06F17/147
    • A fast parallel 2-D discrete casing transform, DCT, device capable of performing a fast 2-D DCT by significantly reducing the number of multiplications during the implementation of the 2-D DCT. N.times.N 2-D input data is re-arranged into N groups so as to be the same as the kernel of a cosine function in order to transform a multiplying form of the cosine function (as the kernel of a 2-D DCT) into a summation form. Then, the first summations and first subtractions are carried out on the re-arranged data, thereby generating first computed data. Then, N 1-D DCT's are carried out on the first computed data. Finally, the 2-D DCT data is generated by carrying out a shifting process after performing additions and subtractions on the 1-D DCT data in log.sub.2 N stages.
    • 一种快速并行的2-D离散壳体变换DCT装置,能够通过在实施2-D DCT期间显着减少乘法次数来执行快速2-D DCT。 将N×N 2-D输入数据重新排列成N组,使其与余弦函数的内核相同,以便将余弦函数的乘法(作为2-D DCT的内核)变换为 求和形式 然后,对重新布置的数据执行第一次和第一次减法,由此产生第一计算数据。 然后,对第一计算数据执行N 1-D DCT。 最后,通过在log2N阶段对1-D DCT数据执行加法和减法之后执行移位处理来产生2-D DCT数据。
    • 7. 发明授权
    • A4-size scanner having function of scanning A3 document and scanning method thereof
    • 具有A3文件扫描功能的A4尺寸扫描仪及其扫描方法
    • US08520273B2
    • 2013-08-27
    • US12567812
    • 2009-09-28
    • Byoung Bag LeeNam Ik ChoSung Hoon Lee
    • Byoung Bag LeeNam Ik ChoSung Hoon Lee
    • H04N1/40
    • H04N1/3876H04N1/00567H04N1/0057H04N1/00602H04N1/0405H04N1/193
    • An A4-size scanner capable of scanning an A3 document. The A4-size scanner includes a scanning part, a transferring roller member that is disposed at an upper side of the flat glass to be orthogonal to a length direction of the automatic document feeding unit and the scanning sensor so that the document having a double size of a scanning capacity of the scanning sensor and introduced onto the flat glass in the length direction of the automatic document feeding unit and the scanning sensor is transferred to a transferring roller, and a transferring roller member driving motor that is connected with the transferring roller which dividedly scans the document having a larger size than the scanning capacity of the scanning sensor; and an image processing part which performs an image processing for composing two images which are dividedly scanned through the scanning part.
    • 可扫描A3文档的A4尺寸扫描仪。 A4尺寸扫描仪包括扫描部分,设置在平板玻璃的上侧以与自动原稿进给单元的长度方向垂直的传送滚筒部件和扫描传感器,使得具有双重尺寸的文档 扫描传感器的扫描能力并沿着自动原稿供给单元的长度方向被引入到平板玻璃上,扫描传感器被传送到转印辊,以及与转印辊连接的转印辊构件驱动电机, 分别扫描具有比扫描传感器的扫描容量大的尺寸的文档; 以及图像处理部,其执行用于构成通过扫描部分分割扫描的两个图像的图像处理。
    • 8. 发明授权
    • Apparatus and method for switching between single description and multiple descriptions
    • 用于在单个描述和多个描述之间切换的装置和方法
    • US08107530B2
    • 2012-01-31
    • US11518356
    • 2006-09-11
    • Il-Koo KimNam-Ik Cho
    • Il-Koo KimNam-Ik Cho
    • H04N7/12H04N11/02H04N11/04H04J3/16H04J3/22
    • H04L1/0009H04N19/12H04N19/166H04N19/172H04N19/18H04N19/19H04N19/39H04N19/40
    • Provided is an apparatus for and a method of transcoding video, in which, in the transmission of a compressed video, the compressed video is transcoded into multiple descriptions in an error prone environment and is transcoded into a single description in an lower error or errorless environment. Video transcoder includes a decoding unit, a single description/multiple description determining unit, and a transcoding unit. The decoding unit decodes a compressed video to generate video header, a motion vector, and a DCT (discrete cosine transform) coefficient for each frame. The single description/multiple description determining unit determines whether to perform transcoding into a single description or multiple descriptions based on the possibility of errors occurring in a transmission channel of the compressed video. The transcoding unit performs transcoding into the single description by coding the DCT coefficient together with the video header and the motion vector when the single description/multiple description determining unit determines to perform transcoding into the single description and performs transcoding into the multiple descriptions by dividing the DCT coefficient into a plurality of DCT coefficients and coding each of the DCT coefficients together with the video header and the motion vector when the single description/multiple description determining unit determines to perform transcoding into the multiple descriptions.
    • 提供了一种对视频进行代码转换的装置和方法,其中在压缩视频的传输中,压缩视频在易错环境中被转码为多个描述,并且在较低错误或无错误环境中被转码为单个描述 。 视频代码转换器包括解码单元,单个描述/多重描述确定单元和代码转换单元。 解码单元对压缩视频进行解码,以生成每帧的视频头,运动矢量和DCT(离散余弦变换)系数。 单个描述/多重描述确定单元基于在压缩视频的传输信道中出现错误的可能性来确定是否将代码转换为单个描述或多个描述。 代码转换单元通过在单个描述/多重描述确定单元确定执行代码转换为单个描述并且通过将代码转换分成多个描述来执行代码转换,将DCT系数与视频标题和运动矢量一起进行编码来执行代码转换为单个描述 DCT系数分解为多个DCT系数,并且当单个描述/多重描述确定单元确定执行代码转换为多个描述时,将每个DCT系数与视频标题和运动矢量一起编码。