Augmented reality project
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If you want to drop a virtual object into video frames in C#, you’ll need two parts:
Frame handling - use EmguCV (OpenCV wrapper for C#) to read/write video.
Rendering - either fake it with Graphics (draw shapes + shadows) or go full 3D with Unity/HelixToolkit, where you can match light and cast shadows.Here’s a tiny fake example with EmguCV to show the idea (draws a ball + shadow on each frame):
var cap = new VideoCapture("input.mp4");
var writer = new VideoWriter("output.mp4", FourCC.H264, 30, cap.Width, cap.Height, true);
Mat frame = new Mat();while (cap.Read(frame))
{
var img = frame.ToImage<Bgr, byte>().ToBitmap();
using (var g = Graphics.FromImage(img))
{
g.FillEllipse(Brushes.Gray, 260, 260, 100, 100); // shadow
g.FillEllipse(Brushes.Blue, 250, 250, 100, 100); // object
}
writer.Write(new Image<Bgr, byte>(img).Mat);
}That’s the basic overlay idea. For real lighting/shadows, you’ll need a 3D engine (Unity + C#) where you can match scene light and render the object properly.