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#include <iostream>
#include <sstream>
#include <fstream>
#include <opencv/cv.h>
#include <opencv/highgui.h>
#include <cvblob.h>
using namespace std;
using namespace cvb;
ofstream nullLog;
ostream* output;
bool cmpArea(const pair<CvLabel, CvBlob*> &p1, const pair<CvLabel, CvBlob*> &p2)
{
return p1.second->area < p2.second->area;
}
int main(int argc, char* argv[]) {
int c;
// drawNumber refers to the number of blobs to draw, it will be either 1 or 2.
int drawNumber = 2;
// ratio of the largest blob to the smallest blob.
double ratio = 0;
bool verbose = false;
bool ratioSet = false;
string usage = "filter-mask -i <input-file> -o <output-file> -r <ratio>";
string inputFileName;
string outputFileName;
CvBlobs blobs;
CvBlobs largeBlobs;
IplImage *inputImg;
IplImage *outputImg;
IplImage *labelImg;
vector< pair<CvLabel, CvBlob*> > blobList;
while ((c = getopt (argc, argv, "i:o:r:hv")) != -1)
switch (c) {
case 'i':
inputFileName = optarg;
break;
case 'o':
outputFileName = optarg;
break;
case 'v':
verbose = true;
break;
case 'r':
ratioSet = true;
ratio = atoi(optarg);
break;
case 'h':
cout << usage << endl;
exit(EXIT_SUCCESS);
break;
default:
break;
}
if ( inputFileName.empty() || outputFileName.empty() || !ratioSet ) {
cerr << usage << endl;
exit(EXIT_FAILURE);
}
(verbose) ? output = &cout : output = &nullLog;
*output << "Verbose logging enabled" << endl;
// read input file
inputImg = cvLoadImage(inputFileName.c_str(), CV_LOAD_IMAGE_GRAYSCALE);
outputImg = cvCreateImage(cvGetSize(inputImg), IPL_DEPTH_8U, 1); cvZero(outputImg);
// label blobs
labelImg = cvCreateImage(cvGetSize(inputImg),IPL_DEPTH_LABEL,1);
cvLabel(inputImg, labelImg, blobs);
// copy and sort blobs
copy(blobs.begin(), blobs.end(), back_inserter(blobList));
sort(blobList.begin(), blobList.end(), cmpArea);
// if no blobs.
if(blobList.size() == 0) {
cerr << "No blobs found" << endl;
cvSaveImage(outputFileName.c_str(), outputImg);
exit(EXIT_FAILURE);
}
// if only one blob is detected.
if(blobList.size() == 1 ) {
*output << "Only one blob found" << endl;
drawNumber = 1;
}
// if the ratio of the of the two blobs is smaller than the input ratio.
if( ((double)blobList[blobList.size()-drawNumber].second->area / (double)blobList[blobList.size()-1].second->area) < (1/ratio) ) {
*output << "the second largest blob is smaller than the ratio. only drawing largest blob" << endl;
drawNumber = 1;
}
for (int i=blobList.size()-drawNumber; i<(int)blobList.size(); i++) {
largeBlobs.insert( CvLabelBlob(blobList[i].first, blobList[i].second) );
*output << "Blob #" << blobList[i].first << " -> " << (*blobList[i].second) << endl;
}
// draw the selected blobsto outputImg and write the image.
cvFilterLabels(labelImg, outputImg, largeBlobs);
cvSaveImage(outputFileName.c_str(), outputImg);
// Release all the memory
cvReleaseImage(&outputImg);
cvReleaseImage(&inputImg);
cvReleaseImage(&labelImg);
cvReleaseImage(&inputImg);
cvReleaseBlobs(blobs);
return 0;
}
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