图像处理指针调用怎么出现问题？
大神，帮我看看这段代码出现什么问题。谁能帮我看看c#做的这段代码有什么问题吗
IntPtr ptrinput = bitinputData.Scan0;
IntPtr ptroutput = bitoutputData.Scan0;
int bytes = bitinputData.Height * bitinputData.Stride;
byte[] grayValue = new byte[bytes];
byte[] tempValue = new byte[bytes];
System.Runtime.InteropServices.Marshal.Copy(ptrinput, grayValue, 0, bytes);
for (int i = 0; i < bitinput.Height-1; i++)
{
for (int j = 0; j < bitinput.Width-1; j++)
tempValue[i * bitinputData.Stride + j] = grayValue[i * bitinputData.Stride + j];
}
为什么显示的图像是几个小的图像。而且这个循环是否有问题。书上都是这样的，为什么我一直得不了正确图像。图像使用的是经过变化后的灰度图像。 图像处理 C# --------------------编程问答-------------------- 能否发相对完整点的代码上来
--------------------编程问答--------------------
private void scoring_Click(object sender, EventArgs e){
Bitmap bitinput1;
string bitNamefile;
OpenFileDialog OpenDig = new OpenFileDialog();
if (OpenDig.ShowDialog() == DialogResult.OK)
{
bitNamefile = OpenDig.FileName;
bitinput1 = (Bitmap)Image.FromFile(bitNamefile);
Bitmap bitinput = new Bitmap(bitinput1.Width, bitinput1.Height, PixelFormat.Format8bppIndexed);
bitinput = RGB(bitinput1);
// pictureBox1.Image = bitinput1;
Bitmap bitoutput = new Bitmap(bitinput.Width, bitinput.Height);
BitmapData bitinputData = bitinput.LockBits(new Rectangle(0, 0, bitinput.Width, bitinput.Height), ImageLockMode.ReadWrite, bitinput.PixelFormat);
BitmapData bitoutputData = bitoutput.LockBits(new Rectangle(0, 0, bitoutput.Width, bitoutput.Height), ImageLockMode.ReadWrite, bitoutput.PixelFormat);
unsafe
{
IntPtr ptrinput = bitinputData.Scan0;
IntPtr ptroutput = bitoutputData.Scan0;
int bytes = bitinputData.Height * bitinputData.Stride;
byte[] grayValue = new byte[bytes];
byte[] tempValue = new byte[bytes];
System.Runtime.InteropServices.Marshal.Copy(ptrinput, grayValue, 0, bytes);
for (int i = 0; i < bitinput.Height-1; i++)
{
for (int j =3; j < (bitinput.Width-1)*3; j+=3)
tempValue[i * bitinputData.Stride + j+3] = grayValue[i * bitinputData.Stride + j+3];
}
// middlefilter(ptrinput, bitinput.Width, bitinput.Height, bitinputData.Stride);
//Sobel(ptrinput, bitinput.Width, bitinput.Height, bitinputData.Stride);
System.Runtime.InteropServices.Marshal.Copy(tempValue, 0,ptroutput, bytes);
}
bitinput.UnlockBits(bitinputData);
bitoutput.UnlockBits(bitoutputData);
pictureBox1.Image = bitoutput;
}
} --------------------编程问答-------------------- tempValue[i * bitinputData.Stride + j] = grayValue[i * bitinputData.Stride + j];这个错了，应该是j*3 --------------------编程问答-------------------- tempValue[i * bitinputData.Stride + j*3] = grayValue[i * bitinputData.Stride + j*3];
tempValue[i * bitinputData.Stride + j*3+1] = grayValue[i * bitinputData.Stride + j*3+1];
tempValue[i * bitinputData.Stride + j*3+2] = grayValue[i * bitinputData.Stride + j*3+2]; --------------------编程问答-------------------- 给你个博客网址，很不错的http://dongtingyueh.blog.163.com/blog/#m=0&t=1&c=fks_084065083084089066081081087095080080080074080083085 --------------------编程问答--------------------
你这个不对的，它的图片是一个8位位图，像素值是一个256调色板索引 --------------------编程问答-------------------- 我使用的是经过RGB转换成灰度的图像，那现在的图像应该是8位位图了，那我使用还需要*3吗 --------------------编程问答-------------------- 这个是我的完整程序，是进行边缘提取，在进行soble算法时出现问题，图像无法生成。
private void scoring_Click(object sender, EventArgs e)
{
Bitmap bitinput1;
string bitNamefile;
OpenFileDialog OpenDig = new OpenFileDialog();
if (OpenDig.ShowDialog() == DialogResult.OK)
{
bitNamefile = OpenDig.FileName;
bitinput1= (Bitmap)Image.FromFile(bitNamefile);
Bitmap bitinput = new Bitmap(bitinput1.Width, bitinput1.Height, PixelFormat.Format8bppIndexed);
bitinput = RGB(bitinput1);
//if (bitinput.PixelFormat == PixelFormat.Format8bppIndexed)
//{
// pictureBox1.Image = bitinput;
//}
//else
//{
// MessageBox.Show("不是8位的");
//}
Bitmap bitoutput = new Bitmap(bitinput.Width, bitinput.Height);
BitmapData bitinputData = bitinput.LockBits(new Rectangle(0, 0, bitinput.Width, bitinput.Height), ImageLockMode.ReadWrite, PixelFormat.Format8bppIndexed);
BitmapData bitoutputData = bitoutput.LockBits(new Rectangle(0, 0, bitoutput.Width, bitoutput.Height), ImageLockMode.ReadWrite, bitoutput.PixelFormat);
unsafe
{
IntPtr ptrinput = bitinputData.Scan0;
IntPtr ptroutput = bitoutputData.Scan0;
int bytes = bitinputData.Height * bitinputData.Stride;
byte[] grayValue = new byte[bytes];
byte[] tempValue = new byte[bytes];
System.Runtime.InteropServices.Marshal.Copy(ptrinput, grayValue, 0, bytes);
tempValue= middlefilter(grayValue, bitinput.Width, bitinput.Height, bitinputData.Stride);
grayValue.Clone();
grayValue=Sobel(tempValue, bitinput.Width, bitinput.Height, bitinputData.Stride);
System.Runtime.InteropServices.Marshal.Copy(grayValue, 0,ptrinput, bytes);
}
bitinput.UnlockBits(bitinputData);
bitoutput.UnlockBits(bitoutputData);
pictureBox1.Image = bitinput;
}
}
private unsafe byte[] Sobel(byte[] grayValue, int width, int height, int stride) //sobel算法
{
double gradX, gradY;
int grad;
double teer1, teer2, teer3, teer4, teer5, teer6, teer7, teer8, teer9;
for (int i = 1; i < height -1; i++)
{
for (int j = 1; j < width - 1; j++)
{
teer1 = Convert.ToDouble(grayValue[(i - 1) * stride + (j - 1)]);
teer2 = Convert.ToDouble(grayValue[(i - 1) * stride + (j)]);
teer3 = Convert.ToDouble(grayValue[(i-1 ) * stride + (j +1)]);
teer4 = Convert.ToDouble(grayValue[(i ) * stride + (j -1)]);
teer5 = Convert.ToDouble(grayValue[(i ) * stride + (j)]);
teer6 = Convert.ToDouble(grayValue[(i ) * stride + (j + 1)]);
teer7 = Convert.ToDouble(grayValue[(i +1) * stride + (j - 1)]);
teer8 = Convert.ToDouble(grayValue[(i+1) * stride + (j)]);
teer9 = Convert.ToDouble(grayValue[(i +1) * stride + (j +1)]);
gradX = (-teer1 + teer3 - 2 * teer4 + 2 * teer6 - teer7 + teer9);
gradY = (teer1 + 2 * teer2 + teer3 - teer7 - 2 * teer8 - teer9);
grad = (int)System.Math.Sqrt((gradX * gradX) +(gradY * gradY));
// if (grad > 255)
grayValue[i * stride + j] =(byte)grad;
//if(grad<0)
// grayValue[i * stride + j] = 0;
}
}
return grayValue;
}
private unsafe byte[] middlefilter(byte[] grayValue, int width, int height,int stride) //中值滤波
{
for (int i = 1; i < height-1; i++)
{
for (int j = 1; j < width-1; j++)
{
byte[] Sort = new byte[]{ grayValue[(i-1)*stride+(j-1)],
grayValue[(i-1)*stride+j],
grayValue[(i-1)*stride+(j+1)],
grayValue[i*stride+(j-1)],
grayValue[i*stride+j],
grayValue[i*stride+(j+1)],
grayValue[(i+1)*stride+(j-1)],
grayValue[(i+1)*stride+j],
grayValue[(i+1)*stride+(j+1)]};
Sort1(Sort);
grayValue[i * stride + j] = Sort[4];
Sort.Clone();
}
}
return grayValue;
}
private void Sort1(byte[] Sort)
{
int min;
for (int i = 0; i < Sort.Length; i++)
{
min = i;
for (int j = i + 1; j < Sort.Length; j++)
{
if (Sort[j] < Sort[min])
min = j;
}
byte t = Sort[min];
Sort[min] = Sort[i];
Sort[i] = t;
}
}
class clsColorPalette
{
public static ColorPalette pal;
}
public static unsafe Bitmap RGB(Bitmap bmInput)//rgb转换成gray
{
try
{
if (bmInput == null) return null;
if (bmInput.PixelFormat == PixelFormat.Format8bppIndexed) return bmInput;
Bitmap bmOutput = new Bitmap(bmInput.Width, bmInput.Height, PixelFormat.Format8bppIndexed);
if (clsColorPalette.pal == null) //获得系统调色板
{
Bitmap monoBitmap = new Bitmap(1, 1, System.Drawing.Imaging.PixelFormat.Format8bppIndexed);
clsColorPalette.pal = monoBitmap.Palette;
for (int i = 0; i < 256; i++)
clsColorPalette.pal.Entries[i] = Color.FromArgb(i, i, i);
}
bmOutput.Palette = clsColorPalette.pal;
BitmapData bmInputData = bmInput.LockBits(new Rectangle(0, 0, bmInput.Width, bmInput.Height), ImageLockMode.ReadWrite, bmInput.PixelFormat);
BitmapData bmOutputData = bmOutput.LockBits(new Rectangle(0, 0, bmOutput.Width, bmOutput.Height), ImageLockMode.ReadWrite, bmOutput.PixelFormat);
Byte* ptrInput = (Byte*)bmInputData.Scan0;
Byte* ptrOutput = (Byte*)bmOutputData.Scan0;
int PixelFormatFactor = 1;
if (bmInput.PixelFormat == PixelFormat.Format24bppRgb) PixelFormatFactor = 3;
if (bmInput.PixelFormat == PixelFormat.Format32bppRgb) PixelFormatFactor = 4;
if (bmInput.PixelFormat == PixelFormat.Format32bppArgb) PixelFormatFactor = 4;
int length = bmInput.Width * PixelFormatFactor;
int nOffset = bmInputData.Stride - bmInput.Width * PixelFormatFactor;
byte red, green, blue;
byte* p = ptrInput;
for (int col = 0; col < bmInput.Height; col++)
{
for (int row = 0; row < bmInput.Width; row++)
{
blue = p[0];
green = p[1];
red = p[2];
byte b = (byte)(0.299 * red + 0.587 * green + 0.114 * blue);
*ptrOutput = b;
p += PixelFormatFactor;
ptrOutput++;
}
p += nOffset;
ptrOutput += bmOutputData.Stride - bmOutput.Width;
}
bmInput.UnlockBits(bmInputData);
bmOutput.UnlockBits(bmOutputData);
return bmOutput;
}
catch (Exception ex)
{
return null;
}
} --------------------编程问答--------------------
你现在的需求我还是不怎么清楚，你这个是复制图像还是什么？ --------------------编程问答-------------------- 我下边这个程序是进行sobel边缘提取，最上面的图像就是复制图像。
补充：.NET技术 , C#
