/// <summary>
/// Called by the video player to handle the next video frame.
/// </summary>
private void videoPlayer1_NextFrame(OpenCVDotNet.UI.VideoPlayer sender, OpenCVDotNet.UI.NextFrameEventArgs args)
{
// args.Frame contains the frame to be handled.
CVImage frame = args.Frame;
// go over all the pixels (rows, cols)
for (int y = 0; y < frame.Height; ++y)
{
for (int x = 0; x < frame.Width; ++x)
{
CVRgbPixel pixel = frame[y, x];
// invert RGB colors.
frame[y, x] = new CVRgbPixel(
(byte)(255 - pixel.R),
(byte)(255 - pixel.G),
(byte)(255 - pixel.B));
}
}
// assign resulting frame to picture box as a bitmap.
pictureBox1.Image = frame.ToBitmap();
writer.WriteFrame(frame);
}
public System.Drawing.Bitmap ToBitmap()
{
#region Initialize Bitmap And Pixel Format
PixelFormat pixelFormat;
if (this.Depth == CVDepth.Depth8U)
{
switch (this.Channels)
{
case 1:
pixelFormat = PixelFormat.Format8bppIndexed;
break;
case 3:
pixelFormat = PixelFormat.Format24bppRgb;
break;
case 4:
pixelFormat = PixelFormat.Format32bppArgb;
break;
default:
throw new NotImplementedException("Format is not supported.");
}
}
else
{
throw new NotImplementedException("Format is not supported.");
}
Bitmap result = new Bitmap(this.Width, this.Height, pixelFormat);
#endregion
BitmapData resultData = result.LockBits(new Rectangle(Point.Empty, new Size(this.Width, this.Height)), ImageLockMode.WriteOnly, pixelFormat);
unsafe
{
byte *pWrite = (byte *)resultData.Scan0;
int cols = this.Width;
int rows = this.Height;
if (Bitmap.IsAlphaPixelFormat(pixelFormat))
{
for (int row = 0; row < rows; ++row, pWrite += resultData.Stride - cols * Channels)
{
for (int col = 0; col < cols; ++col, pWrite += Channels)
{
// TODO: Improve performance
CVRgbPixel c = this[row, col];
pWrite[0] = c.B;
pWrite[1] = c.G;
pWrite[2] = c.R;
pWrite[3] = 255;
}
}
}
else
{
for (int row = 0; row < rows; ++row, pWrite += resultData.Stride - cols * Channels)
{
for (int col = 0; col < cols; ++col, pWrite += Channels)
{
// TODO: Improve performance
CVRgbPixel c = this[row, col];
pWrite[0] = c.B;
pWrite[1] = c.G;
pWrite[2] = c.R;
}
}
}
}
result.UnlockBits(resultData);
//BitmapData resultData = result.LockBits(new Rectangle(Point.Empty, new Size(this.Width, this.Height)), ImageLockMode.WriteOnly, pixelFormat);
//__CvMatPtr stubMat = PInvoke.cvCreateMat(1, 1, 0);
//__CvMatPtr dstMat = PInvoke.cvCreateMat(1, 1, 0);
//__CvMatPtr imageMat;
//__CvArrPtr arrPtr = this.Array;
//int origin = 0;
//unsafe {
// if (PInvoke.CV_IS_IMAGE_HDR(arrPtr)) {
// origin = (new __IplImagePtr(arrPtr.ptr)).ToPointer()->origin;
// }
//}
//imageMat = PInvoke.cvGetMat(arrPtr, stubMat);
//IntPtr hBitmapData = resultData.Scan0;
//PInvoke.cvInitMatHeader(dstMat, this.Height, this.Width, PInvoke.CV_MAKETYPE(8, 3), hBitmapData, (this.Width * this.Channels + 3) & -4);
//unsafe
//{
// PInvoke.cvConvertImage(image, dstMat.ptr,
// Internal.ToPointer()->origin == 1 ? (int)CVConvertImageFlags.Flip : 0);
//}
//result.UnlockBits(resultData);
// TODO: Realese resources...
// Setting Pallete
//if (pixelFormat == PixelFormat.Format8bppIndexed)
//{
// for (byte i = 0; i <= 255; ++i) result.Palette.Entries[i] = Color.FromArgb(i, i, i);
//}
return(result);
//throw new NotImplementedException();
//__CvSize size = new __CvSize(0,0);
//int channels = 0;
//IntPtr dst_ptr = IntPtr.Zero;
//const int channels0 = 3;
//int origin = 0;
//__CvMatPtr stub = PInvoke.cvCreateMat(1,1,0), dst;
//IntPtr image;
//bool changed_size = false; // philipg
////HDC hdc = CreateCompatibleDC(0);
//IntPtr hdc = CreateCompatibleDC(IntPtr.Zero);
//__CvArrPtr arr = this.Array;
//if (PInvoke.CV_IS_IMAGE_HDR(arr)) origin = ((__IplImage*) arr.ptr.ToPointer())->origin;
//image = PInvoke.cvGetMat(arr, &stub);
//byte buffer = new byte[sizeof(BITMAPINFO) + 255*sizeof(RGBQUAD)];
////BITMAPINFO* binfo = (BITMAPINFO*)buffer;
//size.cx = image->width;
//size.cy = image->height;
//channels = channels0;
//FillBitmapInfo(binfo, size.cx, size.cy, channels*8, 1);
//HBITMAP hBitmap = CreateDIBSection(hdc, binfo, DIB_RGB_COLORS, &dst_ptr, 0, 0);
//if (hBitmap == NULL)
// return nullptr;
//PInvoke.cvInitMatHeader(&dst, size.cy, size.cx, CV_8UC3, dst_ptr, (size.cx * channels + 3) & -4);
//PInvoke.cvConvertImage(image, &dst, origin == 0 ? CV_CVTIMG_FLIP : 0);
//System.Drawing.Bitmap^ bmpImage = System.Drawing.Image::FromHbitmap(IntPtr(hBitmap));
//DeleteObject(hBitmap);
//DeleteDC(hdc);
//return bmpImage;
}
private void ProcessBackgroundSubtraction()
{
CVImage frame = videoPlayer.LastFrame;
// access last frame from video player.
for (int row = 0; row < frame.Height; ++row)
{
for (int col = 0; col < frame.Width; ++col)
{
CVRgbPixel pixel = frame[row, col];
// get black and white value for this pixel.
int bwValue = pixel.BwValue;
// accumulate the new value to the moving average.
double val = (double)bwValue / 255.0;
if (bgAccum[row, col] == -1)
{
bgAccum[row, col] = val;
}
else
{
bgAccum[row, col] = alpha * val + (1 - alpha) * bgAccum[row, col];
}
// calculate the diff between the frame and the average up until now.
double delta = val - bgAccum[row, col];
byte currentBgValue = bgFrame[row, col].BwValue;
if (currentBgValue > 0)
{
currentBgValue -= STEP_SIZE;
}
// if delta is smaller than the threshold, eliminate the background.
if (delta < threshold)
{
// set the color of the background frame to black.
//bgFrame[row, col] = new CVRgbPixel(0, 0, 0);
}
else
{
currentBgValue = 255;
}
bgFrame[row, col] = new CVRgbPixel(currentBgValue, currentBgValue, currentBgValue);
}
}
// display the updated frame on the window.
bs.Image = bgFrame.ToBitmap();
}
