/* Image gamma correction
*
* PARAMETERS:
* - src: Mat to perform gamma correction
*
* RETURN: --
*/
void gammaCorrection(const Mat& src, float factor)
{
float inverse_gamma = 1.0/2.5;
Mat lut_matrix(256, 1, CV_8UC1);
uchar* ptr = lut_matrix.ptr<uchar>(0);
for( int i = 0; i < 256; ++i)
ptr[i] = saturate_cast<uchar>(pow(i/255.0, inverse_gamma)*255.0);
LUT(src, lut_matrix, src);
}
void GammaDialog::viewGamma(){
double inverse_gamma = 50 / slSigma->value();
cv::Mat lut_matrix(1, 256, CV_8UC1 );
uchar * ptr = lut_matrix.ptr();
for( int i = 0; i < 256; i++ )
ptr[i] = (int)( cv::pow( (double) i / 255.0, inverse_gamma ) * 255.0 );
cv::Mat result;
cv::LUT( QImage2Mat(imgM), lut_matrix, result );
imgL->setPixmap(QPixmap::fromImage(Mat2QImage(result).scaledToWidth(anch)));
}
