我正在使用以下代码来规范化视频文件中帧序列的直方图,并且仅当compareHist方法返回的差异超过某个阈值时才更改帧:
bool
DMSUSBVideoDevicePlugin::_hasImageChanged()
{
using namespace cv;
Mat src = cv::Mat(_captureHeight, _captureWidth, CV_8UC3, (void*) _imageData);
/// Separate the image in 3 places ( B, G and R )
vector<Mat> bgr_planes;
split( src, bgr_planes );
/// Establish the number of bins
int histSize = 256;
/// Set the ranges ( for B,G,R) )
float range[] = { 0, 256 } ;
const float* histRange = { range };
bool uniform = true;
bool accumulate = false;
SparseMat b_hist, g_hist, r_hist;
/// Compute the histograms:
calcHist( &bgr_planes[1], 1, 0, Mat(), g_hist, 1, &histSize, &histRange, uniform, accumulate);
// Draw the histograms for B, G and R
int hist_w = 512; int hist_h = 400;
int bin_w = cvRound( (double) hist_w/histSize );
Mat histImage( hist_h, hist_w, CV_8UC3, Scalar( 0,0,0) );
normalize(g_hist, g_hist, 0.0, histImage.rows, 32, -1, SparseMat());
static bool isFirstFrame = true;
if(isFirstFrame)
{
_lastGreenHistogram = g_hist;
isFirstFrame = false;
return true;
}
double diff = compareHist(g_hist, _lastGreenHistogram, CV_COMP_BHATTACHARYYA );
_lastGreenHistogram = g_hist;
std::cout << "Diff val: " << diff << std::endl;
if(diff > 1.f)
{
return true;
}
return false;
}
但是,我收到编译错误:
1&gt;。\ DMSUSBVideoDevicePlugin.cpp(454):错误C2665:&#39; cv :: normalize&#39; : 2个重载中没有一个可以转换所有参数类型1&gt;
C:\ opencv \ build \ include \ opencv2 / core / core.hpp(2023):可能是&#39;无效 CV ::正常化(CV :: InputArray,CV :: OutputArray,双,双,INT,INT,CV :: InputArray)&#39;
我做错了什么?
答案 0 :(得分:2)
您正在尝试将SparseMat
转换为InputArray
。这不合法。 InputArray需要一个具有顺序内存的容器。
来自文档:
其中 InputArray是一个可以从Mat构造的类, Mat ,Matx,std :: vector,std :: vector&gt; 或std :: vector。它也可以由矩阵构造 表达
您可以阅读InputArray here。
您应该使用常规cv::Mat
对象,因为normalize函数不会创建源的副本。
对于OutputArray也是如此。