/// <summary>
/// 四边形变换
/// </summary>
/// <param name="bmp">源位图</param>
/// <param name="lt">左上角点</param>
/// <param name="rt">右上角点</param>
/// <param name="rb">右下角点</param>
/// <param name="lb">左下角点</param>
/// <returns></returns>
public static Bitmap QuadrilateralTransform(Bitmap bmp, IntPoint lt, IntPoint rt, IntPoint rb, IntPoint lb)
{
// define quadrilateral's corners
List <IntPoint> corners = new List <IntPoint>();
corners.Add(lt);
corners.Add(rt);
corners.Add(rb);
corners.Add(lb);
// create filter
BackwardQuadrilateralTransformation filter =
new BackwardQuadrilateralTransformation(bmp, corners);
Bitmap dest = new Bitmap(bmp.Width, bmp.Height, bmp.PixelFormat);
// apply the filter
return(filter.Apply(dest));
}
public static void CreateBackMappingPicture()
{
Bitmap target = new Bitmap(640, 480);
Bitmap source = new Bitmap(640, 480);
const int size = 1000;
const double ratio = 1.0 / size;
const double saturation = 1.0;
Color[,] colors = new Color[size, size];
for (int x = 0; x < source.Width; x++)
{
double lightness = 1.0 - x * ratio;
for (int y = 0; y < source.Height; y++)
{
double hue = y * ratio;
//colors[x, y] = FromHSL(hue, saturation, lightness);
}
}
source.Save(@"c:\temp\mapping.bmp");
List <IntPoint> corners = new List <IntPoint>();
corners.Add(new IntPoint(266, 480 - 410));
corners.Add(new IntPoint(522, 480 - 353));
corners.Add(new IntPoint(533, 480 - 147));
corners.Add(new IntPoint(266, 480 - 167));
BackwardQuadrilateralTransformation filter = new BackwardQuadrilateralTransformation(source, corners);
// apply the filter
Bitmap newImage = filter.Apply(target);
newImage.Save(@"c:\temp\mappingback.bmp");
}
public static Bitmap Test(Bitmap bitmap)
{
BackwardQuadrilateralTransformation transformation = new BackwardQuadrilateralTransformation(bitmap, Corners);
return(transformation.Apply(bitmap));
}
