EmguCV学习笔记:Image

最新推荐文章于 2024-12-02 15:44:48 发布

原创最新推荐文章于 2024-12-02 15:44:48 发布 · 4.5k 阅读

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这篇博客介绍了如何使用EmguCV进行图像处理，包括运算符重载，如加减乘除，图像与图像及值的运算。还探讨了像素操作，如赋值和取反，并提到了.And(), .Xor(), .Not()等函数的应用。文章指出，这些运算通常不会改变原始图像，但._And(), ._Not()等会在图像本身进行运算。此外，还讨论了元素类型转换的便捷性和序列化与反序列化对象的方法。" 115385657,7303234,RK3399平台pinctrl子系统与设备驱动绑定解析,"['嵌入式开发', '平台开发', 'RK3399', 'pinctrl']

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运算符重载 (重载运算符 +, -, *，实现图像与图像，图像与值的运算)

Image<Gray,Byte> img1;
//Do somthing to initialize img1

Image<Gray,Byte> img2;
//Do somthing to initialize img2

IMage<Gray,Byte> img3=(img1+img2-2.0)*0.5;

像素操作(赋值，取反等)

Image<Gray, Byte> img1 = new Image<Gray, Byte>(400, 300, new Gray(30));
Image<Gray, Byte> img2 = img1.Not();
Image<Gray, Byte> img3 =
 img1.Convert<Byte>( delegate(Byte b) { return (Byte) (255-b); } );
Image<Gray, Single> img4 = img1.Convert<Single>(
 delegate(Byte b) { return (Single) Math.cos( b * b / 255.0); }  );

注意.And(),.Xor(),.Not()等运算会返回计算结果而原始图像内容未发生改变，

._And(),._Not()则是在图像本身进行运算(而不返回)，计算完成后图像内容已改变

元素类型转换(极其方便，一条语句基本上可以搞定大部分的基础转换)

Image<Bgr, Byte> img1;
Image<Gray, Single> img2 = img1.Convert<Gray, Single>();
Bitmap bmp=img2.ToBitmap();

序列化(XML文档)

序列化：将object obj的内容写到XML文档

反序列化：从XML文档构建obj对象

StringBuilder sb = new StringBuilder();
(new XmlSerializer(typeof(Image<Bgr, Byte>))).Serialize(new StringWriter(sb), obj);
XmlDocument xDoc = new XmlDocument();
xDoc.LoadXml(sb.ToString());

Image<Bgr, Byte> image = (Image<Bgr, Byte>) 
(new XmlSerializer(typeof(Image<Bgr, Byte>))).Deserialize(new XmlNodeReader(xDoc));

完整的示例

using System;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using Emgu.CV;
using Emgu.CV.Structure;
using System.IO;
using System.Xml;
using System.Xml.Serialization;

namespace EmguImageProcess
{
    public class ImageProcess
    {
        private Image<Bgr, Byte> image = null;

        /// <summary>
        /// Form中的图片控件（请使用Designer设计器）
        /// </summary>
        // private Emgu.CV.UI.ImageBox imageBox1; 
        // private System.WIndows.Forms.PictureBox pictureBox1;
        ///////////////////////////////////////

        public void MenuItemOpenFile_Click(object sender, EventArgs e)
        {
            OpenFileDialog ofd = new OpenFileDialog();
            ofd.Filter = "Image File(*.jpg;*.png;*.*)|*.*";
            ofd.Multiselect = false;
            if (ofd.ShowDialog() == DialogResult.OK)
            {
                image = new Image<Bgr, byte>(ofd.FileName);
            }
        }

        private void MenuItemDisplayImage_Click(object sender, EventArgs e)
        {
            if (image == null) return;
            imageBox1.Image = image;
            pictureBox1.Image = image.ToBitmap();
        }

        private void MenuItemToGray_Click(object sender, EventArgs e)
        {
            if (image == null) return;
            Image<Gray, Byte> gray = image.Convert<Gray, Byte>();
            imageBox1.Image = gray;
        }

        private void MenuItemConsine_Click(object sender, EventArgs e)
        {
            if (image == null) return;
            Image<Bgr, Single> cosGray = image.Convert<Single>(
                delegate(Byte b) { return (Single)Math.Cos(b * b / 255.0); });
            imageBox1.Image = cosGray;
        }

        private void MenuItemXmlSerial_Click(object sender, EventArgs e)
        {
            if (image == null) return;
            SaveFileDialog sfd = new SaveFileDialog();
            sfd.Filter = "XML File(*.xml)|*.xml";
            if (sfd.ShowDialog() == DialogResult.OK)
            {
                StringBuilder sb = new StringBuilder();
                (new XmlSerializer(typeof(Image<Bgr, Byte>))).Serialize(new StringWriter(sb), image);
                XmlDocument xDoc = new XmlDocument();
                xDoc.LoadXml(sb.ToString());
                xDoc.Save(sfd.FileName);
            }
        }

        private void MenuItemXmlLoad_Click(object sender, EventArgs e)
        {
            OpenFileDialog ofd = new OpenFileDialog();
            ofd.Filter = "XML File(*.xml)|*.xml";
            ofd.Multiselect = false;
            if (ofd.ShowDialog() == DialogResult.OK)
            {
                XmlDocument xDoc = new XmlDocument();
                xDoc.Load(ofd.FileName);
                image = (Image<Bgr, Byte>)(new XmlSerializer(
                    typeof(Image<Bgr, Byte>))).Deserialize(new XmlNodeReader(xDoc));
            }
        }
    }
}

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