OpenCV : homomorphic filter

Question

i want to use a homomorphic filter to work on underwater image. I tried to code it with the codes found on the internet but i have always a black image... I tried to normali

Answer 1

I was doing this method to balance illumination when camera was changed caused the Image waw dark!

I tried to FFT to the frequency to filter the image! it's work.but use too much time.(2750*3680RGB image).so I do it in Spatial domain.

here is my code!

//IplImage *imgSrcI=cvLoadImage("E:\\lean.jpg",-1);
Mat imgSrcM(imgSrc,true);
Mat imgDstM;

Mat imgGray;
Mat imgHls;
vector vHls;

Mat imgTemp1=Mat::zeros(imgSrcM.size(),CV_64FC1);
Mat imgTemp2=Mat::zeros(imgSrcM.size(),CV_64FC1);

if(imgSrcM.channels()==1)
{
    imgGray=imgSrcM.clone();
}
else if (imgSrcM.channels()==3)
{
    cvtColor(imgSrcM, imgHls, CV_BGR2HLS);
    split(imgHls, vHls);
    imgGray=vHls.at(1);
}
else
{
    return -1;
}
imgGray.convertTo(imgTemp1,CV_64FC1);
imgTemp1=imgTemp1+0.0001;
log(imgTemp1,imgTemp1);

GaussianBlur(imgTemp1, imgTemp2, Size(21, 21), 0.1, 0.1, BORDER_DEFAULT);//imgTemp2是低通滤波的结果
imgTemp1 = (imgTemp1 - imgTemp2);//imgTemp1是对数减低通的高通
addWeighted(imgTemp2, 0.7, imgTemp1, 1.4, 1, imgTemp1, -1);//imgTemp1是压制低频增强高频的结构

exp(imgTemp1,imgTemp1);
normalize(imgTemp1,imgTemp1,0,1,NORM_MINMAX);
imgTemp1=imgTemp1*255;

imgTemp1.convertTo(imgGray, CV_8UC1);

//imwrite("E:\\leanImgGray.jpg",imgGray);
if (imgSrcM.channels()==3)
{
    vHls.at(1)=imgGray;
    merge(vHls,imgHls);
    cvtColor(imgHls, imgDstM, CV_HLS2BGR);

}
else if (imgSrcM.channels()==1)
{
    imgDstM=imgGray.clone();
}

cvCopy(&(IplImage)imgDstM,imgDst);
//cvShowImage("jpg",imgDst);

return 0;