1 #include
2 using namespace cv;
3 int main()
4 {
5 Mat g_srcImage = imread("11.jpg");
6 imshow("g_srcImage", g_srcImage);
7 waitKey(0);
8
9 vector g_vChannels;
10 split(g_srcImage, g_vChannels);
11
12 Mat imageBlueChannel = g_vChannels.at(0);
13 Mat imageGreenChannel = g_vChannels.at(1);
14 Mat imageRedChannel = g_vChannels.at(2);
15
16
17 Mat img_B = (2 * imageBlueChannel - imageGreenChannel - imageRedChannel);
18 imshow("img_B", img_B);
19 waitKey(0);
20
21 threshold(img_B, img_B, 0, 255, CV_THRESH_OTSU);
22 imshow("img_B_g", img_B);
23 waitKey(0);
24
25 //对每个轮廓进行分析
26 vector contours;
27 vector hierarchy;
28 double min_area = 50;//小于50的认为不是数字
29
30 findContours(img_B, contours, hierarchy, CV_RETR_CCOMP, CV_CHAIN_APPROX_SIMPLE);
31
32 // fill external contours
33 if (!contours.empty() && !hierarchy.empty())
34 {
35 for (int idx = 0; idx < contours.size(); idx++)
36 {
37 //Mat temp_img(Size(img_B.size()), CV_8U, Scalar(0));
38 drawContours(img_B, contours, idx, Scalar(255), CV_FILLED, 8);//填充 形成区域
39
40 drawContours(g_srcImage, contours, idx, Scalar(255,255,255), CV_FILLED, 8);//填充 形成区域
41
42
43 }
44 }
45 imshow("g_srcImage11", g_srcImage);
46 waitKey(0);
47 imwrite("g_srcImage.bmp", g_srcImage);
48
49 }
效果图：
