OpenCV：calcHist计算图像直方图( 三 ) _2410

              line(drawImage, Point(i, drawImage.rows - 1), Point(i, drawImage.rows - 1 - value), Scalar(255, 0, 0));
       }
       imshow("【直方图】", drawImage);
       waitKey(0);
       return 0;
}

5彩色直方图的绘制：
int main()
{
       Mat srcImage = imread("mask.jpg");
       imshow("【原图】", srcImage);
       int channels = 0;
       MatND dstHist;
       int histSize = 256 ;
       float midRanges[] = { 0, 256 };
       const float *ranges[] = { midRanges };
       calcHist(&srcImage, 1, &channels, Mat(), dstHist, 1, &histSize, ranges, true, false);
       //绘制蓝色通道
       Mat b_drawImage = Mat::zeros(Size(256, 256), CV_8UC3);
       double g_dHistMaxValue = https://vvvtt.com/article/0;
       minMaxLoc(dstHist, 0, &g_dHistMaxValue, 0, 0);
       for (int i = 0; i < histSize; i++)
       {
              int value = https://vvvtt.com/article/cvRound(dstHist.at(i) * 256 * 0.9 / g_dHistMaxValue);
              rectangle(b_drawImage,
                     Point(i * 8, b_drawImage.rows - 1),
                     Point(i * 8 + 256 / histSize, b_drawImage.rows - 1 - value)
                     ,Scalar(255, 0, 0), -1);
       }
       imshow("【蓝色通道的直方图】", b_drawImage);
       //绘制绿色通道
       channels = 1;
       calcHist(&srcImage, 1, &channels, Mat(), dstHist, 1, &histSize, ranges, true, false);
       Mat g_drawImage = Mat::zeros(Size(256, 256), CV_8UC3);
       minMaxLoc(dstHist, 0, &g_dHistMaxValue, 0, 0);
       for (int i = 0; i < histSize; i++)
       {
              int value = https://vvvtt.com/article/cvRound(dstHist.at(i) * 256 * 0.9 / g_dHistMaxValue);
              rectangle(g_drawImage,
                     Point(i * 8, g_drawImage.rows - 1),

OpenCV：calcHist计算图像直方图( 三 )

猜你喜欢