小编Sru*_*ury的帖子

int main()
{

vector<vector<Point>> contours;
vector<Vec4i> hierarchy;
int largest_area=0;
int largest_contour_index=0;


OriginalImage = imread("C:\\Data Drive\\opencv Projects\\testwithC++\\Plant001-9\\SideView90\\Day_021.png",CV_LOAD_IMAGE_GRAYSCALE);
BackgroundImage = imread("C:\\Data Drive\\opencv Projects\\testwithC++\\Plant001-9\\SideView90\\Day_001.png",CV_LOAD_IMAGE_GRAYSCALE);

absdiff(OriginalImage,BackgroundImage,GrayImage);
threshold(GrayImage,Binary,80,255,CV_THRESH_BINARY);


namedWindow( "OriginalImage", WINDOW_NORMAL);             
imshow("OriginalImage", OriginalImage);                   


namedWindow( "BackgroundImage", WINDOW_NORMAL);             
imshow("BackgroundImage", BackgroundImage);                 

namedWindow( "GrayImage", WINDOW_NORMAL);               
imshow("GrayImage", GrayImage);                         


namedWindow( "Binary", WINDOW_NORMAL);              
imshow("Binary", Binary);                 

ImageROI = Binary(Rect(300,0,Binary.size().width-600,Binary.size().height));

namedWindow( "ImageROI", WINDOW_NORMAL);                
imshow("ImageROI", ImageROI);                           

dilate(ImageROI,BinaryMorph,Mat(),Point(-1,-1),2);

namedWindow( "BinaryMorph", WINDOW_NORMAL);             
imshow("BinaryMorph", BinaryMorph);                 

findContours(BinaryMorph, contours, hierarchy, RETR_EXTERNAL, CV_CHAIN_APPROX_SIMPLE, Point(0, 0) );

for( int i = 0; i< contours.size(); i++ )
 {
    double a=contourArea(contours[i],false);
    if(a>largest_area)
    {
    largest_area=a; …