Question

我得到以下代码以在源图像中找到模板：

private void button1_Click(object sender, EventArgs e)
    {
        toggleStatus();
        using (Mat template = CvInvoke.Imread("C:\\Users\\Hendr\\Desktop\\temp.png", Emgu.CV.CvEnum.ImreadModes.Grayscale))
        using (Mat source = CvInvoke.Imread("C:\\Users\\Hendr\\Desktop\\yVLsd.png", Emgu.CV.CvEnum.ImreadModes.Grayscale))
        {
            log("Image loaded into memory...");
         //   pictureBox1.Image = template.Bitmap;
            pictureBox1.Image = source.Bitmap;

            var width = source.Width - template.Width + 1;
            var height = source.Height - template.Height + 1;
            // Mat result = new Mat((new System.Drawing.Size(width,height), Emgu.CV.CvEnum.IplDepth.IplDepth32F, 1);
            Mat result = new Mat(width, height, DepthType.Cv8U, 1);

            CvInvoke.MatchTemplate(source, template, result ,Emgu.CV.CvEnum.TemplateMatchingType.SqdiffNormed);
            var THRESHOLD = 0.0;

            double minVal = 0, maxVal = 0;
            System.Drawing.Point minLoc = new Point(), maxLoc = new Point();
            CvInvoke.MinMaxLoc(result, ref minVal, ref maxVal, ref minLoc, ref maxLoc);
            Rectangle rect = new Rectangle(minLoc.X,minLoc.Y, width,height);
            var outlineColor = (minVal > THRESHOLD) ?Color.Green : Color.Red;
            CvInvoke.Rectangle(result, rect, new MCvScalar(0,0,0));

            log(rect.Location.ToString());
            pictureBox1.Image = result.Bitmap;
        }
        foreach (object itemChecked in checkedListBox1.CheckedItems)
        {
            // Use the IndexOf method to get the index of an item.
            MessageBox.Show("Item with title: \"" + itemChecked.ToString() +
                            "\", is checked. Checked state is: " +
                            checkedListBox1.GetItemCheckState(checkedListBox1.Items.IndexOf(itemChecked)).ToString() + ".");
        }
    }

源图像如下所示：

以及相应的模板：

但是，我的结果全被涂黑了：

我验证了template和source Mat是否已正确装入内存。参见pictureBox1.Image = source.Bitmap; ...。

最后，我找不到文档中的任何信息，为什么我的result Mat（pictureBox1.Image = result.Bitmap;）是黑色的。其他人也有这个问题，可以给我一些参考链接或快速修复程序吗？

Answer 1

当为Java运行相同的示例时，我遇到了相同的问题。我通过使用数据类型CV_32FC1解决了它。对于您的C＃代码，我认为应该是：

import signal
signal.signal(signal.SIGINT, signal.SIG_DFL)

有关c ++，java和python中相同模板匹配示例的完整说明，请检查：

https://docs.opencv.org/3.4/de/da9/tutorial_template_matching.html

Answer 2

通过像这样的归一化，确保结果在[0,255]范围内：

normalize( result, result, 0, 255, NORM_MINMAX, CV_8UC1);

how-to-use-cv2-imshow-correctly-for-the-float

OpenCV模板匹配结果为黑色

2 个答案: