- 基于opencv的灰度变换

#e#

//对数变换

void Log(Mat src, Mat intermediate,int c)

{

for (int i = 0;i < src.rows;i++)

{

for (int j = 0;j < src.cols;j++)

{

int b = c*log(1+src.at(i, j));

int d = b % 256;

intermediate.at(i, j) = d;

}

}

}

//幂次变换

void Power(Mat src, Mat intermediate,float gamma)

{

for (int i = 0;i < src.rows;i++)

{

for (int j = 0;j < src.cols;j++)

{

float c = pow(255, 1 - gamma);

int b = c*pow(src.at(i, j), gamma);

int d = b % 256;

intermediate.at(i, j) = d;

}

}

}

//对比拉伸

void Stretch(Mat src, Mat intermediate,float r1, float s1, float r2, float s2 )

{

float k1, k2, k3, b1, b2, b3;

k1 = s1 / r1;

b1 = 0.0;

k2 = (s2 - s1) / (r2 - r1);

b2 = (s1*r2 - s2*r1) / (r2 - r1);

k3 = (255.0 - s2) / (255.0 - r2);

b3 = (255.0*s2-r2*255.0) / (255.0 - r2);

cout << b3;

for (int i = 0;i < src.rows;i++)

{

for (int j = 0;j < src.cols;j++)

{

if (src.at(i, j) >= 0.0 && src.at(i, j) <= r1)

{

int a = k1*src.at(i, j) + b1;

int b = a % 256;

intermediate.at(i, j) = b;

}

if (src.at(i, j) >= r1 && src.at(i, j) <= r2)

{

int a = k2*src.at(i, j) + b2;

int b = a % 256;

intermediate.at(i, j) = b;

}

if (src.at(i, j) >= r2 && src.at(i, j) <= 255.0)

{

int a = k3*src.at(i, j) + b3;

int b = a % 256;

intermediate.at(i, j) = b;

}

}

}

}