在鼠标移动时获得bmp的rgb值 [英] getting rgb value of a bmp on mouse move

问题描述

我希望使用aforge.net api在c sharp中获取鼠标移动事件中图像的rgb值。当移动鼠标图像时，相应地显示该点的rgb值。

I想要使用非托管图像和指针数据。我不必使用 getpixel（） method.kindly帮我。下面是我的代码。

提前感谢

 private void Form1_MouseMove（object sender，MouseEventArgs e）
 {
 // loading image 
 Graphics g = CreateGraphics（）; 
位图bmp =新位图（bmpimage54.bmp）; 
 Rectangle r = new Rectangle（0,0，bmp.Width，bmp.Height）; 
 g.DrawImage（bmp，r，r，GraphicsUnit.Pixel）; 
 //在鼠标移动时获取像素值
 
 Rectangle sourceRect = new Rectangle（0,0，bmp.Width，bmp.Height）; 
 BitmapData imageData = bmp.LockBits（sourceRect，ImageLockMode.ReadWrite，PixelFormat.Format24bppRgb）; 
 UnmanagedImage unmanagedImage = new UnmanagedImage（imageData）; 
 unsafe 
 {
 byte * imgPtr =（byte *）imageData.Scan0.ToPointer（）; 
 byte * ptr; 
 for（int i = 0; i< imageData.Height; i ++）
 {
 for（int j = 0; j< imageData.Width; j ++）
 { 
 imgPtr + = 3; 
} 
 imgPtr + = imageData.Stride  -  imageData.Width * 3; 
} 
} 
 bmp.UnlockBits（imageData）; 
} 

解决方案

为什么你要申请循环？



一旦你知道了坐标，你可以使用索引即方括号来获得特定颜色的值



i已将图像加载到图片框中，然后使用鼠标移动图片框事件

  private   void  pictureBox1_MouseMove（ object  sender，MouseEventArgs e）
 {
 Bitmap bmp = 新位图（pictureBox1.Image）; 
 BitmapData bd = bmp.LockBits（ new 矩形（ 0 ， 0 ，bmp.Width，bmp.Height），ImageLockMode.ReadOnly，PixelFormat.Format24bppRgb）; 
 
 不安全 
 {
 byte * ptr =（byte *）bd.Scan0; 
  int  x = e.X *  3 ; 
  int  y = e.Y * bd.Stride; 
 label1.Text = e.Location.ToString（）; 
 label2.Text = ptr [x + y] .ToString（）+  ， + ptr [x + y +  1 ]。ToString（）+  ， + ptr [x + y +  2 ]。ToString（）; 
} 
} 
 

来自cordinates的
，计算x，y的值，然后x + y用于到达像素位置



x + y给出蓝色值

x + y + 1给出绿色值

x + y + 2给出红色值

谢谢你abdur Rehman。它真的解决了我的问题。

 BitmapData bd; 
 
 private void detection_pictureBox_MouseMove（object sender，MouseEventArgs e）
 {
 if（detection_pictureBox.Image！= null）
 {
 unsafe 
 {
 byte * ptr =（byte *）bd.Scan0; 
 int x = e.X * 3; 
 int y = e.Y * bd.Stride; 
 CurrPointerPos_lbl.Text = e.Location.ToString（）; 
 CurrPointerCol_lbl.Text = ptr [x + y] .ToString（）+，+ ptr [x + y + 1] .ToString（）+，+ ptr [x + y + 2] .ToString （）; 
} 
 
} 
} 
 
 private void detection_pictureBox_MouseEnter（object sender，EventArgs e）
 {
 if（detection_pictureBox。 Image！= null）
 {
 bd =（RunImgProcess.detectionImg）.LockBits（new Rectangle（0,0，RunImgProcess.detectionImg.Width，RunImgProcess.detectionImg.Height），ImageLockMode.ReadOnly，RunImgProcess。 detectionImg.PixelFormat）; 
} 
} 
 
 private void detection_pictureBox_MouseLeave（object sender，EventArgs e）
 {
 if（detection_pictureBox.Image！= null）
 {
（RunImgProcess.detectionImg）.UnlockBits（bd）; 
} 
} 
 

I want to get rgb value of the image on mouse move event in c sharp using aforge.net api.As when move mouse image then correspondingly it displays the rgb value of that point.
I want to do it using unmanaged image and pointer data. I dont have to use getpixel() method.kindly help me.below is my code.
thanks in advance

private void Form1_MouseMove(object sender, MouseEventArgs e)
        {
            // loading image
            Graphics g = CreateGraphics();
            Bitmap bmp = new Bitmap("bmpimage54.bmp");
            Rectangle r = new Rectangle(0, 0, bmp.Width, bmp.Height);
            g.DrawImage(bmp, r, r, GraphicsUnit.Pixel);
         // getting pixel values on mouse move

            Rectangle sourceRect = new Rectangle(0, 0, bmp.Width, bmp.Height);
            BitmapData imageData = bmp.LockBits(sourceRect,                    ImageLockMode.ReadWrite,PixelFormat.Format24bppRgb);
           UnmanagedImage unmanagedImage = new UnmanagedImage( imageData );
   unsafe
            {
                byte* imgPtr = (byte*)imageData.Scan0.ToPointer();
                byte* ptr;
                for (int i = 0; i < imageData.Height; i++)
                {
                    for (int j = 0; j < imageData.Width; j++)
                    {   
                        imgPtr += 3;
                    }
                    imgPtr += imageData.Stride - imageData.Width * 3;
                }
           }      
             bmp.UnlockBits(imageData);
        }

解决方案

why u are applying loop?

once u know the co-ordinates, u can use indexing i.e square brackets to get the value of that particular color

i have loaded an image into picturebox, then using mouse move event of picture box

private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
{
     Bitmap bmp=new Bitmap(pictureBox1.Image);
     BitmapData bd=bmp.LockBits(new Rectangle(0,0,bmp.Width,bmp.Height),ImageLockMode.ReadOnly,PixelFormat.Format24bppRgb);

     unsafe
     {
         byte* ptr = (byte*)bd.Scan0;
         int x = e.X * 3;
         int y = e.Y * bd.Stride;
         label1.Text = e.Location.ToString();
         label2.Text = ptr[x + y].ToString() + "," + ptr[x + y + 1].ToString() + "," + ptr[x + y + 2].ToString();
     }
}

from cordinates, value of x,y is calculated, then x+y is used to reach the pixel location

x+y gives blue color value
x+y+1 gives green color value
x+y+2 gives red color value

thank u abdur Rehman. It really solved my problem.

BitmapData bd;

private void detection_pictureBox_MouseMove(object sender, MouseEventArgs e)
{
    if (detection_pictureBox.Image != null)
    {
        unsafe
        {
            byte* ptr = (byte*)bd.Scan0;
            int x = e.X * 3;
            int y = e.Y * bd.Stride;
            CurrPointerPos_lbl.Text = e.Location.ToString();
            CurrPointerCol_lbl.Text = ptr[x + y].ToString() + "," + ptr[x + y + 1].ToString() + "," + ptr[x + y + 2].ToString();
        }

    }
}

private void detection_pictureBox_MouseEnter(object sender, EventArgs e)
{
    if (detection_pictureBox.Image != null)
    {
        bd = (RunImgProcess.detectionImg).LockBits(new Rectangle(0, 0, RunImgProcess.detectionImg.Width, RunImgProcess.detectionImg.Height), ImageLockMode.ReadOnly, RunImgProcess.detectionImg.PixelFormat);
    }
}

private void detection_pictureBox_MouseLeave(object sender, EventArgs e)
{
    if (detection_pictureBox.Image != null)
    {
        (RunImgProcess.detectionImg).UnlockBits(bd);
    }
}

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