Java，Android 离散余弦变换 DCT

概述publicdouble[]DCT(intdirection,intlength,double[]X){if(direction==1||direction==-1){X=Discrete_Cosine_Transform(direction,length,X);}returnX;}publicdouble[]Discrete_Cosine_Transform(intdirection,intl

public double[] DCT(int direction, int length, double[] X){    if (direction == 1 || direction == -1)    {        X=discrete_Cosine_transform(direction, length, X);    }    return X;}public double[] discrete_Cosine_transform(int direction, int length, double[] X){    double[] x = new double[length];    for (int i = 0; i < length; i++)    {        x[i] = X[i];    }    for (int k = 0; k < length; k++)    {        double sum = 0;        if (direction == 1)        {            for (int n = 0; n < length; n++)            {                sum += ((k == 0) ? (Math.sqrt(0.5)) : (1)) * x[n] * Math.cos(pi * (n + 0.5) * k / length);            }        }        else if (direction == -1)        {            for (int n = 0; n < length; n++)            {                sum += ((n == 0) ? (Math.sqrt(0.5)) : (1)) * x[n] * Math.cos(pi * n * (k + 0.5) / length);            }        }        X[k] = sum * Math.sqrt(2.0 / length);    }    return X;}

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