trouble in getting subimage....!
void FindBlobs(const Mat &binary,vector<vector<point2i>>&blobs);
int main()
{
// load the image
Mat img = imread("C:\\Users\\xyz\\Desktop\\text.jpg");
if(!img.data) {
cout << "File not found" << endl;
return -1;
}
//Image scaling
Mat img_scale= imread("C:\\Users\\sujay\\Desktop\\texture.jpeg");
resize(img,img, img_scale.size());
// show it in a window
namedWindow( "Image", WINDOW_AUTOSIZE );
imshow("Image", img);
// image window will immediately disappear if the program ends, so
// we'll wait for a keypress, indefinitely
waitKey();
// first copy the image
Mat img_gray = img.clone();
cvtColor(img, img_gray, CV_RGB2GRAY);
imshow("Image", img_gray);
waitKey();
// do a simple transformation: convert to binary
// first copy the image
Mat img_binary = img.clone();
threshold(img_gray, img_binary, 128.0, 255.0, THRESH_BINARY_INV);
resize(img_binary,img_binary, img_scale.size());
imshow("Image", img_binary);
waitKey();
threshold(img_binary, img_binary, 0.0, 1.0, THRESH_BINARY);
resize(img_binary,img_binary, img_scale.size());
Mat output = Mat::zeros(img.size(), CV_8UC3);
vector < vector<Point2i > > blobs;
FindBlobs(img_binary, blobs);
int x1=0,x2=0,y1=0,y2=0;
// Randomy color the blobs
for(size_t i=0; i < blobs.size(); i++) {
unsigned char r = 255 * (rand()/(1.0 + RAND_MAX));
unsigned char g = 255 * (rand()/(1.0 + RAND_MAX));
unsigned char b = 255 * (rand()/(1.0 + RAND_MAX));
for(size_t j=0; j < blobs[i].size(); j++) {
int x = blobs[i][j].x;
int y = blobs[i][j].y;
if
if(j == 0)
{
x1=x;
x2=x;
y1=y;
y2=y;
}
else
{
if(x<x1)
x1=x;
if(x>x2)
x2=x;
if(y<y1)
y1=y;
if(y>y2)
y2=y;
}
output.at<Vec3b>(y,x)[0] = b;
output.at<Vec3b>(y,x)[1] = g;
output.at<Vec3b>(y,x)[2] = r;
}
Mat subImage(output, cv::Rect(x1, y1, x2-x1, y2-y1));
imshow("sub", subImage);
}
imshow("labelled", output);
waitKey(0);
return 0;
}
void FindBlobs(const cv::Mat &binary, std::vector < std::vector<cv::Point2i> > &blobs)
{
blobs.clear();
cv::Mat label_image;
binary.convertTo(label_image, CV_32SC1);
int label_count = 2; // starts at 2 because 0,1 are used already
for(int y=0; y < label_image.rows; y++) {
int *row = (int*)label_image.ptr(y);
for(int x=0; x < label_image.cols; x++) {
if(row[x] != 1) {
continue;
}
cv::Rect rect;
cv::floodFill(label_image, cv::Point(x,y), label_count, &rect, 0, 0, 4);
std::vector <cv::Point2i> blob;
for(int i=rect.y; i < (rect.y+rect.height); i++) {
int *row2 = (int*)label_image.ptr(i);
for(int j=rect.x; j < (rect.x+rect.width); j++) {
if(row2[j] != label_count) {
continue;
}
blob.push_back(cv::Point2i(j,i));
}
}
blobs.push_back(blob);
label_count++;
}
}
}