用c++写一个opencv直方图的代码
时间: 2023-03-29 15:01:20 浏览: 66
可以使用以下代码来实现 OpenCV 直方图:
```c
#include <opencv2/opencv.hpp>
using namespace cv;
int main()
{
Mat image = imread("image.jpg", IMREAD_GRAYSCALE);
if (image.empty())
{
std::cout << "Could not read the image" << std::endl;
return -1;
}
int histSize = 256;
float range[] = { , 256 };
const float* histRange = { range };
bool uniform = true, accumulate = false;
Mat hist;
calcHist(&image, 1, , Mat(), hist, 1, &histSize, &histRange, uniform, accumulate);
int hist_w = 512, hist_h = 400;
int bin_w = cvRound((double)hist_w / histSize);
Mat histImage(hist_h, hist_w, CV_8UC1, Scalar());
normalize(hist, hist, , histImage.rows, NORM_MINMAX, -1, Mat());
for (int i = 1; i < histSize; i++)
{
line(histImage, Point(bin_w * (i - 1), hist_h - cvRound(hist.at<float>(i - 1))),
Point(bin_w * (i), hist_h - cvRound(hist.at<float>(i))),
Scalar(255), 2, LINE_AA);
}
imshow("Histogram", histImage);
waitKey();
return ;
}
```
这段代码会读取名为 "image.jpg" 的灰度图像,计算其直方图,并将直方图绘制在一个黑色背景上。你可以根据需要修改代码来适应你的应用场景。