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    • 2. 发明申请
    • A DECODING METHOD AND APPARATUS
    • WO2003088505A3
    • 2003-10-23
    • PCT/US2003/010639
    • 2003-04-07
    • ALION SCIENCE AND TECHNOLOGY CORP.
    • MAIUZZO, Michael, AnthonyKENNETH, Kahle, Roberts
    • H03M13/29
    • A method and apparatus for decoding forward error correction (FEC) encoded data. A stream of units of FEC encoded bits are received, where the units are derived from a transmitted signal, where each unit represents a one-bit data value, and where each unit includes correctness bits that together reflect a level of probability that the one-bit data value represented by the unit differs from corresponding bits in the signal before it was transmitted. The stream of units of FEC encoded bits are decoded by using the quality level of bits to perform soft-decision convolution decoding on the stream of units of FEC bits, where the soft decision convolution decoding produces, for block decoding, a stream of symbols made up of bits. In the stream of units of FEC bits, subsequences of units that are prone to erroneous soft-decision convolution decoding are detected by determining, for the sub-sequences whether the distribution of quality bits indicate the units are below a threshold level of correctness, and by comparing characteristics of that distribution to a given set of characteristics predetermined to be prone to result in incorrect decoding. Among the symbols produced for block decoding, symbols containing one or more bits that correspond to units that were in subsequences detected to be prone to erroneous soft-decision convolution decoding are flagged or tagged, and thereby, errors in the stream of symbols may be soft-decision block decoded by erasing the flagged symbols.
    • 3. 发明申请
    • METHOD OF IMPROVING A DIGITAL IMAGE
    • 改进数字图像的方法
    • WO1997045809A1
    • 1997-12-04
    • PCT/US1997007996
    • 1997-05-08
    • SCIENCE AND TECHNOLOGY CORP.
    • SCIENCE AND TECHNOLOGY CORP.RAHMAN, Zia-urJOBSON, Daniel, J.WOODELL, Glenn, A.
    • G06T05/20
    • G06T5/20
    • A method of improving a digital image is provided. The image is initially represented by digital data indexed to represent positions on a display. The digital data is indicative of an intensity value Ii(x,y) for each position (x,y) in each i-th spectral band. The intensity value for each position in each i-th spectral band is adjusted to generate an adjusted intensity value for each position in equation (I), each i-th spectral band in accordance with where S is the number of unique spectral bands included in said digital data, Wn is a weighting factor and "*" denotes the convolution operator. Each surround function Fn(x,y) is uniquely scaled to improve an aspect of the digital image, e.g., dynamic range compression, color constancy, and lightness rendition. The adjusted intensity value for each position in each i-th spectral band is filtered with a common function and then presented to a display device. For color images, a novel color restoration step is added to give the image true-to-life color that closely matches human observation.
    • 提供了一种改善数字图像的方法。 该图像最初由被索引以表示显示器上的位置的数字数据表示。 数字数据表示每个第i个频谱带中每个位置(x,y)的强度值I i(x,y)。 调整每个第i个频谱带中每个位置的强度值,以生成等式(I)中每个位置的调整强度值,每个第i个频谱带,其中S是包括在 所述数字数据Wn是权重因子,“*”表示卷积运算符。 每个环绕功能Fn(x,y)被唯一地缩放以改善数字图像的一个方面,例如动态范围压缩,颜色恒定性和亮度再现。 每个第i个频谱带中每个位置的调整强度值用公共功能进行滤波,然后呈现给显示装置。 对于彩色图像,添加了一种新颖的颜色恢复步骤来给出与人类观察紧密匹配的图像真实颜色。