我尝试使用countNonZero()函数获取水平投影,如下所示。
Mat src = imread(INPUT_FILE, CV_LOAD_IMAGE_COLOR);
Mat binaryImage = src.clone();
cvtColor(src, src, CV_BGR2GRAY);
Mat horizontal = Mat::zeros(1,binaryImage.cols, CV_8UC1);
for (int i = 0; i<binaryImage.cols; i++)
{
Mat roi = binaryImage(Rect(0, 0, 1, binaryImage.rows));
horizontal.at<int>(0,i) = countNonZero(roi);
cout << "Col no:" << i << " >>" << horizontal.at<int>(0, i);
}
但在调用countonZero()函数的那一行出现了错误。错误如下。
OpenCV Error: Assertion failed (src.channels() == 1 && func != 0) in cv::countNo
nZero, file C:\builds\2_4_PackSlave-win32-vc12-shared\opencv\modules\core\src\st
at.cpp, line 549
有人能指出错误吗?