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    • 2. 发明申请
    • IMAGE DETAIL ENHANCEMENT
    • 图像细节增强
    • WO2007036853A3
    • 2007-07-05
    • PCT/IB2006053414
    • 2006-09-21
    • KONINKL PHILIPS ELECTRONICS NVCORDES CLAUS NRAMAN NALLIAH
    • CORDES CLAUS NRAMAN NALLIAH
    • G06T5/00G06T5/20
    • G06T5/20G06T5/001
    • A method of enhancing details in an input image. The input image comprises input pixels, which have input pixel values (IPV) limited to a range (RA). The method comprises average filtering (1) the input pixel values (IPV) to obtain average brightness values (LV). A luminance mask is applied (2) to the average brightness values (LV) to obtain masked values (MV) which are different for average brightness values (LV) in a sub-range (SR) of the range (RA) than for pixels outside the sub-range (SR). The input pixel values (IPV) are detail filtered (3) to obtain detail values (HV) indicative for an amount of detail. A non-linear function (NLF) is applied (5) on the input pixel values (IPV) to obtain for each input pixel value (IPV) a corresponding output pixel value (OPV). A gain of the non- linear function (NLF) is dependent on both the masked value (MV) and detail value (HV) which both are determined for the particular input pixel. The gain is higher for input pixels with input pixel values (IPV) outside the sub-range (SR) than for input pixels with input pixel values (IPV) inside the sub-range (SR). And the gain is higher for input pixels for which the detail value (HV) indicates more high frequency content in the image portion around the particular input pixel than for input pixels for which the detail value (HV) indicates less high frequency content.
    • 一种增强输入图像中的细节的方法。 输入图像包括输入像素,其具有限于范围(RA)的输入像素值(IPV)。 该方法包括平均滤波(1)输入像素值(IPV)以获得平均亮度值(LV)。 将亮度掩模(2)应用于平均亮度值(LV),以获得与范围(RA)的子范围(SR)中的平均亮度值(LV)不同的屏蔽值(MV),而不是像素 在子范围(SR)之外。 详细过滤输入像素值(IPV)(3)以获得指示细节量的细节值(HV)。 对输入像素值(IPV)应用非线性函数(NLF)(5),以获得每个输入像素值(IPV)相应的输出像素值(OPV)。 非线性函数(NLF)的增益取决于对特定输入像素确定的掩蔽值(MV)和细节值(HV)。 在子范围(SR)之外的输入像素值(IPV)的输入像素的增益要高于在子范围(SR)内的输入像素值(IPV)的输入像素。 并且增益对于输入像素较高,其中细节值(HV)表示特定输入像素周围的图像部分中的更高频率内容,而不是细节值(HV)表示较低频率内容的输入像素。
    • 4. 发明申请
    • IMAGE ENHANCEMENT
    • 图像增强
    • WO2008142641A3
    • 2009-05-07
    • PCT/IB2008051975
    • 2008-05-20
    • KONINKL PHILIPS ELECTRONICS NVZHAO MENGCORDES CLAUS NVAN DER HEIJDEN HENRICUS W P
    • ZHAO MENGCORDES CLAUS NVAN DER HEIJDEN HENRICUS W P
    • G06T5/00
    • G06T5/007
    • A method of image enhancement linear contrast enhances(l) an input image signal (FI) to obtain a first enhanced signal (FLC), and non- linear contrast enhances (2) the input image signal (FI) to obtain a second enhanced signal (FGA). An average pixel value (FLF) of pixels of the input image signal (FI) is determined (3). The first enhanced signal (FLC) and the second enhanced signal (FGA) are mixed (4) in response to the average pixel value (FLF) to obtain a mixed signal (FMA). A contribution of the first enhanced signal (FLC) to the mixed signal (FMA) is lower for low and high values of the average pixel value (FLF) than for mid values of the average pixel value (FLF), and a contribution of the second enhanced signal (FGA) to the mixed signal (FMA) is higher for low and high values of the average pixel value (FLF) than for mid values of the average pixel value (FLF).
    • 图像增强线性对比度的方法增强(l)输入图像信号(FI)以获得第一增强信号(FLC),并且非线性对比增强(2)输入图像信号(FI)以获得第二增强信号 (FGA)。 确定输入图像信号(FI)的像素的平均像素值(FLF)(3)。 响应于平均像素值(FLF)将第一增强信号(FLC)和第二增强信号(FGA)混合(4)以获得混合信号(FMA)。 对于平均像素值(FLF)的低和高值,第一增强信号(FLC)对混合信号(FMA)的贡献比平均像素值(FLF)的中间值的贡献低, 对于平均像素值(FLF)的低和高值,与平均像素值(FLF)的中间值相比,混合信号(FMA)的第二增强信号(FGA)更高。