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    • 17. 发明授权
    • Image gamut mapping
    • 图像色域映射
    • US08379971B2
    • 2013-02-19
    • US12377612
    • 2007-08-13
    • Remco Theodorus Johannes MuijsErno Hermanus Antonius Langendijk
    • Remco Theodorus Johannes MuijsErno Hermanus Antonius Langendijk
    • G06K9/00
    • H04N1/6058
    • A method of gamut mapping maps an input image composed of pixels and having an input gamut (IG) defined by input RGB primaries (Ri, Gi, Bi) to a reproduction gamut (RG) defined by reproduction RGB primaries (Ro, Go, Bo). The reproduction gamut (RG) is narrower than the input gamut (IG). An input signal (RGBin) defined with respect to the input RGB primaries (Ri, Gi, Bi) is color transformed (1) into a transformed signal (RGBt) defined with respect to the reproduction RGB primaries (Ro, Go, Bo), whereby color information of the pixels (P1, P2, P3) within the reproduction gamut (RG) is preserved. Scaling factors (SFi) indicating a distance between on the one hand pixels (P1, P2, P3) of the transformed signal (RGBt) which are outside the reproduction gamut (RG), and on the other hand an edge of the reproduction gamut (RG) are determined (2). The scaling factors (SFi) of pixels (P1, P2, P3) of the transformed signal (RGBt) are spatial low-pass filtered (3) to obtain filtered factors (FFi) for these pixels (P1, P2, P3). Component signal values of the transformed signal (RGBt) of the pixels (P1, P2, P3) are corrected (4) in response to the filtered factors (FFi) to obtain reproduction signal values (RGBo) which are input values (RGBi) moved towards inside the reproduction gamut (RG).
    • 色域映射的方法将由像素组成的输入图像映射到由RGB RGB原色(Ro,Go,Bo)定义的再现色域(RG)的输入RGB原色(Ri,Gi,Bi)所定义的输入色域(IG) )。 再现色域(RG)比输入色域(IG)窄。 相对于输入RGB原色(Ri,Gi,Bi)定义的输入信号(RGBin)被颜色变换(1)成相对于再现RGB原色(Ro,Go,Bo)定义的变换信号(RGBt) 由此保持再现色域(RG)内的像素(P1,P2,P3)的颜色信息。 指示在再现色域(RG)之外的变换信号(RGBt)的一方像素(P1,P2,P3)之间的距离的倍率因子(SFi),另一方面指示再现色域的边缘 RG)(2)。 变换信号(RGBt)的像素(P1,P2,P3)的缩放因子(SFi)被空间低通滤波(3),以获得这些像素(P1,P2,P3)的滤波因子(FFi)。 响应于滤波因子(FFi)校正(4)像素(P1,P2,P3)的变换信号(RGBt)的分量信号值,以获得被移动的输入值(RGBi)的再现信号值(RGBo) 朝向再现色域(RG)内。
    • 18. 发明申请
    • IMAGE GAMUT MAPPING
    • 图像游戏绘图
    • US20100165139A1
    • 2010-07-01
    • US12377612
    • 2007-08-13
    • Remco Theodorus Johanne MuijsErno Hermanus Antonius Langendijk
    • Remco Theodorus Johanne MuijsErno Hermanus Antonius Langendijk
    • H04N5/228G06K9/00G09G5/02
    • H04N1/6058
    • A method of gamut mapping maps an input image composed of pixels and having an input gamut (IG) defined by input RGB primaries (Ri, Gi, Bi) to a reproduction gamut (RG) defined by reproduction RGB primaries (Ro, Go, Bo). The reproduction gamut (RG) is narrower than the input gamut (IG). An input signal (RGBin) defined with respect to the input RGB primaries (Ri, Gi, Bi) is color transformed (1) into a transformed signal (RGBt) defined with respect to the reproduction RGB primaries (Ro, Go, Bo), whereby color information of the pixels (P1, P2, P3) within the reproduction gamut (RG) is preserved. Scaling factors (SFi) indicating a distance between on the one hand pixels (P1, P2, P3) of the transformed signal (RGBt) which are outside the reproduction gamut (RG), and on the other hand an edge of the reproduction gamut (RG) are determined (2). The scaling factors (SFi) of pixels (P1, P2, P3) of the transformed signal (RGBt) are spatial low-pass filtered (3) to obtain filtered factors (FFi) for these pixels (P1, P2, P3). Component signal values of the transformed signal (RGBt) of the pixels (P1, P2, P3) are corrected (4) in response to the filtered factors (FFi) to obtain reproduction signal values (RGBo) which are input values (RGBi) moved towards inside the reproduction gamut (RG).
    • 色域映射的方法将由像素组成的输入图像映射到由RGB RGB原色(Ro,Go,Bo)定义的再现色域(RG)的输入RGB原色(Ri,Gi,Bi)定义的输入色域(IG) )。 再现色域(RG)比输入色域(IG)窄。 相对于输入RGB原色(Ri,Gi,Bi)定义的输入信号(RGBin)被颜色变换(1)成相对于再现RGB原色(Ro,Go,Bo)定义的变换信号(RGBt) 由此保持再现色域(RG)内的像素(P1,P2,P3)的颜色信息。 指示在再现色域(RG)之外的变换信号(RGBt)的一方像素(P1,P2,P3)之间的距离的倍率因子(SFi),另一方面指示再现色域的边缘 RG)(2)。 变换信号(RGBt)的像素(P1,P2,P3)的缩放因子(SFi)被空间低通滤波(3),以获得这些像素(P1,P2,P3)的滤波因子(FFi)。 响应于滤波因子(FFi)校正(4)像素(P1,P2,P3)的变换信号(RGBt)的分量信号值,以获得被移动的输入值(RGBi)的再现信号值(RGBo) 朝向再现色域(RG)内。
    • 20. 发明申请
    • COLOR MAPPING METHOD
    • 颜色映射方法
    • US20100103200A1
    • 2010-04-29
    • US12444733
    • 2007-10-05
    • Erno Hermanus Antonius Langendijk
    • Erno Hermanus Antonius Langendijk
    • G09G5/10
    • G09G5/02G09G3/2074G09G3/3611G09G2300/0439G09G2300/0452G09G2340/06H04N9/3114H04N9/67
    • A color mapping method maps an input image signal (IS) into an output image signal (OS) for a display (DD) with display pixels (Pi) having sub-pixels (RP, GP, BP, YP) with primary colors (RW, GW, BW, YW) defining a display color gamut (WG). A look-up table (1) comprises stored luminances (LU) of reflective spectra (RS) at different chromaticities (λO) within the display color gamut (WG). The reflective spectra (RS) are spectra of reflective objects (RO) having a substantial maximum reflectivity at the corresponding chromaticities (λO). The color mapping method comprises a gamut mapping (2), retrieving (3) a looked-up luminance (Y1), a factor determination (4), and adapting the mapped luminance (Ym; Y). The gamut mapping (2) maps the input image signal (IS) having input pixel colors defined by an input luminance (Y) and an input chromaticity (x, y) into a mapped image signal (MS) having corresponding mapped pixel colors defined by a mapped luminance (Ym; Y) and a mapped chromaticity (xm, ym). The input pixel colors lie within an input color gamut different than the display color gamut (WG). The looked-up luminance (Y1) is retrieved (3) by looking up the stored luminance (LU) in the look-up table (1) at the mapped chromaticity (xm, ym). The factor (F) is determined (4) from a difference between the looked-up luminance (Y1) and the mapped luminance (Ym; Y). The mapped luminance (Ym; Y) is adapted (5) by using the factor (F; G) to obtain an output luminance (Ys) nearer to the looked-up luminance (Y1) than the mapped luminance (Ym). The image output signal (OS) is defined by the mapped chromaticity (xm, ym) and the output luminance (Ys).
    • 颜色映射方法将输入图像信号(IS)映射到具有基本颜色的子像素(RP,GP,BP,YP)的显示像素(Pi)的显示器(DD)的输出图像信号(OS)(RW ,GW,BW,YW)来定义显示色域(WG)。 查找表(1)包括在显示色域(WG)内的不同色度(λO)的反射光谱(RS)的存储亮度(LU)。 反射光谱(RS)是在相应色度(λO)下具有相当大的最大反射率的反射物体(RO)的光谱。 颜色映射方法包括色域映射(2),检索(3)查找亮度(Y1),因子确定(4)和适配映射亮度(Ym; Y)。 色域映射(2)将具有由输入亮度(Y)和输入色度(x,y)定义的输入像素颜色的输入图像信号(IS)映射为具有对应的映射像素颜色的映射图像信号(MS) 映射亮度(Ym; Y)和映射色度(xm,ym)。 输入像素颜色位于与显示色域(WG)不同的输入色域内。 通过在映射色度(xm,ym)处查找查找表(1)中的存储亮度(LU)来检索查找亮度(Y1)(3)。 从查找亮度(Y1)和映射亮度(Ym; Y)之间的差确定因子(F)(4)。 通过使用因子(F; G)来使映射亮度(Ym; Y)适应(5),以获得比映射亮度(Ym)更接近查找亮度(Y1)的输出亮度(Ys)。 图像输出信号(OS)由映射的色度(xm,ym)和输出亮度(Ys)定义。