/// <summary> /// The blending filter is able to blend two images using a homography matrix. /// A linear alpha gradient is used to smooth out differences between the two /// images, effectively blending them in two images. The gradient is computed /// considering the distance between the centers of the two images. /// </summary> /// <param name="im">Image.</param> /// <param name="overlayIm">The overlay image (also called the anchor).</param> /// <param name="homography">Homography matrix used to map a image passed to /// the filter to the overlay image specified at filter creation.</param> /// <param name="fillColor">The filling color used to fill blank spaces. The filling color will only be visible after the image is converted /// to 24bpp. The alpha channel will be used internally by the filter.</param> /// <param name="gradient">A value indicating whether to blend using a linear /// gradient or just superimpose the two images with equal weights.</param> /// <param name="alphaOnly">A value indicating whether only the alpha channel /// should be blended. This can be used together with a transparency /// mask to selectively blend only portions of the image.</param> /// <returns>Blended image.</returns> public static Bgra <byte>[,] Blend(this Gray <byte>[,] im, Gray <byte>[,] overlayIm, MatrixH homography, Bgra <byte> fillColor, bool gradient = true, bool alphaOnly = false) { Bgra <byte>[,] resultImage = null; using (var uOverlayIm = overlayIm.Lock()) { Blend blend = new Blend(homography, uOverlayIm.AsBitmap()); blend.AlphaOnly = alphaOnly; blend.Gradient = gradient; blend.FillColor = fillColor.ToColor(); resultImage = im.ApplyBaseTransformationFilter <Gray <byte>, Bgra <byte> >(blend); } return(resultImage); }