Question

我计算了图像的R，G和B值，并进行了一些计算以获得LAB Colorspace的L，a和b值。现在我如何使用Android Studio中的这些L，a和b值将我的RGB图像传输到LAB图像（除了OpenCV的内置功能，因为我想首先将RGB转换为XYZ，然后最终将XYZ转换为LAB颜色空间）？

Answer 1

将 RGB 值传递给此类的函数，该函数将返回包含 LAB

值的数组

public class CIELab {
String TAG ="RGB";
public double[] rgbToLab(int R, int G, int B) {
    double[] lab=new double[3];
    double r, g, b, X, Y, Z, xr, yr, zr;
    ColorUtils.RGBToLAB(R,G,B,lab);
    //Core.absdiff();

    // D65/2°
    double Xr = 95.047;
    double Yr = 100.0;
    double Zr = 108.883;


    // --------- RGB to XYZ ---------//

    r = R/255.0;
    g = G/255.0;
    b = B/255.0;

    if (r > 0.04045)
        r = Math.pow((r+0.055)/1.055,2.4);
    else
        r = r/12.92;

    if (g > 0.04045)
        g = Math.pow((g+0.055)/1.055,2.4);
    else
        g = g/12.92;

    if (b > 0.04045)
        b = Math.pow((b+0.055)/1.055,2.4);
    else
        b = b/12.92 ;

    r*=100;
    g*=100;
    b*=100;
    Log.d(TAG,"R:"+r+" G:"+g+" B:"+b);
    X =  0.4124*r + 0.3576*g + 0.1805*b;
    Y =  0.2126*r + 0.7152*g + 0.0722*b;
    Z =  0.0193*r + 0.1192*g + 0.9505*b;


    // --------- XYZ to Lab --------- //

    xr = X/Xr;
    yr = Y/Yr;
    zr = Z/Zr;

    if ( xr > 0.008856 )
        xr =  (float) Math.pow(xr, 1/3.);
    else
        xr = (float) ((7.787 * xr) + 16 / 116.0);

    if ( yr > 0.008856 )
        yr =  (float) Math.pow(yr, 1/3.);
    else
        yr = (float) ((7.787 * yr) + 16 / 116.0);

    if ( zr > 0.008856 )
        zr =  (float) Math.pow(zr, 1/3.);
    else
        zr = (float) ((7.787 * zr) + 16 / 116.0);


    double[] lab = new double[3];

    lab[0] = (116*yr)-16;
    lab[1] = 500*(xr-yr);
    lab[2] = 200*(yr-zr);

    return lab;

   }
}

在Eclipse（JAVA）中RGB到XYZ然后XYZ到LAB

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