视线语音鼠标 4 C#图像的读取和显示

读取图像的rgb信息，做视频流的话，不用指针速度是无法忍受的。

用rectangle框选，转为bitmapData，用指针读，注意颜色顺序是b,g,r。

显示的话也是差不多的，我的图像显示是二值图（Seg存的），返回bitmap，到时可用pictureBox什么的显示就行了。

不多说了，上代码。

public void InIt(Bitmap Source)
{
int iWidth = Source.Width;
int iHeight = Source.Height;

Rectangle rect = new Rectangle(0, 0, iWidth, iHeight);

BitmapData bmpData = Source.LockBits(rect, ImageLockMode.ReadWrite, Source.PixelFormat);

int r, g, b;

IntPtr iPtr = bmpData.Scan0;

unsafe //启动不安全代码
{
byte* Ptr = (byte*)(void*)iPtr;

int srcOffset = bmpData.Stride - iWidth * 4;

for (int j = 0; j < iHeight; j++)
{
for (int i = 0; i < iWidth; i++, Ptr += 4)
{
b = (int)Ptr[0];
g = (int)Ptr[1];
r = (int)Ptr[2];
}
Ptr += srcOffset;
}
}
Source.UnlockBits(bmpData);
}

public static Bitmap Display(double[,] Seg)
{
int iWidth = Seg.GetLength(0);
int iHeight = Seg.GetLength(1);

Bitmap Result = new Bitmap(iWidth, iHeight, System.Drawing.Imaging.PixelFormat.Format24bppRgb);

Rectangle rect = new Rectangle(0, 0, iWidth, iHeight);

BitmapData bmpData1 = Result.LockBits(rect, ImageLockMode.ReadWrite, Result.PixelFormat);

IntPtr iPtr1 = bmpData1.Scan0;

int iBytes = iWidth * iHeight * 3;

byte[] PixelValues = new byte[iBytes];

int iPoint = 0;

for (int j = 0; j < iHeight; j++)
{
for (int i = 0; i < iWidth; i++, iPoint += 3)
{

if (Seg[i, j] > 0)
{
PixelValues[iPoint] = Convert.ToByte(255);
PixelValues[iPoint + 1] = Convert.ToByte(255);
PixelValues[iPoint + 2] = Convert.ToByte(255);
}
else
{
PixelValues[iPoint] = Convert.ToByte(0);
PixelValues[iPoint + 1] = Convert.ToByte(0);
PixelValues[iPoint + 2] = Convert.ToByte(0);
}
}
}

Marshal.Copy(PixelValues, 0, iPtr1, iBytes);

Result.UnlockBits(bmpData1);

return Result;
}