c# - How to find one image inside of another?

Question

I have 2 bmp images. ImageA is a screenshot (example) ImageB is a subset of that. Say for example, an icon.

I want to find the X,Y coordinates of ImageB within ImageA (if it exists).

Any idea how I would do that?

Answer 1

Here's a quick sample but it is slow take around 4-6 seconds, but it does exactly what you looking for and i know this post is old but if anyone else visiting this post recently you can look this thing you need .NET AForge namespace or framework google it and install it include AForge name space in your project and that's it it finds the pictiure with another and gives out the coordinates.

System.Drawing.Bitmap sourceImage = (Bitmap)Bitmap.FromFile(@"C:SavedBMPs1.jpg");
            System.Drawing.Bitmap template = (Bitmap)Bitmap.FromFile(@"C:SavedBMPs2.jpg");
            // create template matching algorithm's instance
            // (set similarity threshold to 92.1%)

           ExhaustiveTemplateMatching tm = new ExhaustiveTemplateMatching(0.921f);
                // find all matchings with specified above similarity

                TemplateMatch[] matchings = tm.ProcessImage(sourceImage, template);
                // highlight found matchings

           BitmapData data = sourceImage.LockBits(
                new Rectangle(0, 0, sourceImage.Width, sourceImage.Height),
                ImageLockMode.ReadWrite, sourceImage.PixelFormat);
            foreach (TemplateMatch m in matchings)
            {

                    Drawing.Rectangle(data, m.Rectangle, Color.White);

                MessageBox.Show(m.Rectangle.Location.ToString());
                // do something else with matching
            }
            sourceImage.UnlockBits(data);