extracting a rectangle containing texts

edit

what have you tried, so far ?

(right now, it's only another "i want" question, showing no research, skill or effort)

I try many algorithme, detection of text and morphlogy segmentation.

int main() {

Mat large = imread("result.png");

Mat rgb;    // downsample and use it for processing    pyrDown(large, rgb);

Mat small;

cvtColor(rgb, small, CV_BGR2GRAY); // morphological gradient

Mat grad;

Mat morphKernel = getStructuringElement(MORPH_ELLIPSE,    Size(3, 3));

morphologyEx(small, grad, MORPH_GRADIENT, morphKernel);

// binarize
Mat bw; threshold(grad, bw, 0.0, 255.0, THRESH_BINARY | THRESH_OTSU);
// connect horizontally oriented regions Mat connected;
morphKernel = getStructuringElement(MORPH_RECT, Size(9, 1));
morphologyEx(bw, connected, MORPH_CLOSE, morphKernel);
// find contours Mat mask = Mat::zeros(bw.size(), CV_8UC1);