Function to demo Gabor Filter params

gaborFilterDemo.cpp

void gaborFilterDemo() {
    string inpImgFPath = "testImg.png";
    cv::Mat inpImg = imread(inpImgFPath);
    
    cv::Mat grayInpImg;
    cvtColor(inpImg,grayInpImg,CV_BGR2GRAY);
    
    cv::Mat grayInpImg_F;
    grayInpImg.convertTo(grayInpImg_F,CV_32F);
    
    int kernel_size = 5;
    double sig = 5, th = 0, lm = 8, gm = 0.02, ps = 0;
    //Vector<tupe<parm,title,inc_val>
    vector<tuple<double*,string,float>> parms = {make_tuple(&th,"Thetha",0.1),make_tuple(&lm,"lambda",1),make_tuple(&sig,"sigma",1),make_tuple(&gm,"Gamma",0.01),make_tuple(&ps,"Phase",1)};
    int prmIdx=0;

    while(true) {
        Mat kernel = cv::getGaborKernel(cv::Size(kernel_size,kernel_size), sig, th, lm, gm, ps, CV_32F);
        Mat dest;
        filter2D(grayInpImg_F, dest, CV_32F, kernel);
        
        cv::Mat normDest;
        cv::normalize( dest, normDest,0,255,NORM_MINMAX);    
        
        vector<cv::Mat> imgs = {inpImg,grayInpImg,dest,normDest};
        cv::Mat opImg = utils::renderImgsToHorizontalStack(imgs);
        imshow("OP",opImg);
        
        Mat bkernel = cv::getGaborKernel(cv::Size(101,101), sig, th, lm, gm, ps, CV_32F);
        Mat normbKernel;
        cv::normalize(bkernel,normbKernel,0,255,NORM_MINMAX);
        cv::Mat kernalOpImg = utils::renderImgsToHorizontalStack({bkernel,normbKernel});
        imshow("Kernal",bkernel);
        
        printf("sig: %f, th: %f, lm:%f, gm:%f, ps:%f\n",sig,th,lm,gm,ps);
        
        uchar key = waitKey(0);
        if(key == 'q') {
            break;
        }else if(key == 'w') {
            double *parmVar;
            string title;
            float incVal;
            tie(parmVar,title,incVal) = parms[prmIdx];
            *parmVar+=incVal;

        }else if(key == 's') {
            double *parmVar;
            string title;
            float incVal;
            tie(parmVar,title,incVal) = parms[prmIdx];
            *parmVar-=incVal;
        }else if(key == 'a') {
            prmIdx-=1;
            if(prmIdx < 0) prmIdx= parms.size() -1;

            string title = std::get<1>(parms[prmIdx]);
            cout<<title<<" chosen"<<endl;
        }else if(key == 'd') {
            prmIdx+=1;
            if(prmIdx >= parms.size()) prmIdx= 0;
            
            string title = std::get<1>(parms[prmIdx]);
            cout<<title<<" chosen"<<endl;
        }else {
            //cout<<key<<", "<<(int)key<<endl;
        }
    }
}