OpenCV cv :: CalcHist - 無匹配功能

Question

我想在計算凸輪位移之前計算圖像的一部分直方圖。我跟了一個例子 - 但是bviously不夠緊密，因爲我得到一個錯誤說沒有匹配的函數調用CalcHist與我發送的參數...

float max_val = 0.f; 
Mat hsv; 
int hbins = 30, sbins = 32; 
int histSize[] = {hbins, sbins}; 
float hranges[] = { 0, 180 }; 
float sranges[] = { 0, 256 }; 
const float* ranges[] = { hranges, sranges }; 
int channels[] = {0, 1}; 
cv::cvtColor(image(_cars[i]), hsv, CV_BGR2HSV); 

cv::calcHist(&hsv, 1, channels, Mat(), // do not use mask 
       thisCar.hist, 2, histSize, ranges, true, false); 

Answer 1

我有一些問題，這是好。但是，這個版本的代碼適合我。

float max_val = 0.f; 
cv::Mat img; 
cv::Mat hsv; 
cv::MatND hist; 
int hbins = 30, sbins = 32; 
int histSize[] = {hbins, sbins}; 
float hranges[] = { 0, 180 }; 
float sranges[] = { 0, 256 }; 
const float* ranges[] = { hranges, sranges }; 
int channels[] = {0, 1}; 
cv::cvtColor(img, hsv, CV_BGR2HSV); 
cv::calcHist(&hsv, 1, channels, cv::Mat(), hist, 2, histSize, ranges, true, false);