private double[,] GetFaceAffine(Rect origRect, Point origLeftEye, Point origRightEye, Rect targetRect, Point targetLeftEye, Point targetRightEye)
{
// Step 1 - Construct the affine transformation
// Find mapping between orig and desired EyePosAsMatrix locations + a
// fake point located at right angles to the vector joing the two eyes
//INumArray<float> origMat = ArrFactory.FloatArray(3, 2);
//INumArray<float> targetMat = ArrFactory.FloatArray(3, 3);
INumArray <float> targetMat = ArrFactory.FloatArray(3, 2);
INumArray <float> origMat = ArrFactory.FloatArray(3, 3);
FaceSortUI.ImageUtils.EyePosAsMatrix(origRect, origLeftEye, origRightEye, ref origMat);
FaceSortUI.ImageUtils.EyePosAsMatrix(targetRect, targetLeftEye, targetRightEye, ref targetMat);
//targetMat[0, 2] = 1.0F;
//targetMat[1, 2] = 1.0F;
//targetMat[2, 2] = 1.0F;
//SVDFloat svd = new SVDFloat(targetMat);
//INumArray<float> sss = svd.Solve(origMat);
origMat[0, 2] = 1.0F;
origMat[1, 2] = 1.0F;
origMat[2, 2] = 1.0F;
SVDFloat svd = new SVDFloat(origMat);
INumArray <float> sss = svd.Solve(targetMat);
INumArray <float> mmm = (INumArray <float>)sss.Transpose();
double[,] affineMat = ArrFactory.DoubleArray(mmm).ToArray();
return(affineMat);
}
/// <summary>
/// Extract a normalized face from an input image. Normalization is done
/// by ensuring that the eye positions in the original image
/// map to the specified position in the face image. The input
/// inage is assumed to be 1 byte per channel. Steps involved
/// 1. Construct an affine mapping from Destination to original eye location
/// 2. Fill in the destination image using the mapping
/// </summary>
/// <param name="origImage">Input image as a byte array</param>
/// <param name="origRect">Size of the original image</param>
/// <param name="origLeftEye">Left eye location in source image</param>
/// <param name="origRightEye">Right eye location in source</param>
/// <param name="bytePerPix"># bytes per Pixel in original image.Since we assume 1 byte per channel this is same as # channels Face is constructed with same</param>
/// <param name="faceRect">Desired face size</param>
/// <param name="faceLeftEye">Desired left eye location in face</param>
/// <param name="faceRightEye">Desired right eye loc in face</param>
/// <returns>Images array representing the colour plane of extracted face</returns>
static public Image[] ExtractNormalizeFace(Image[] origImage, Rect origRect, Point origLeftEye, Point origRightEye, int bytePerPix,
Rect faceRect, Point faceLeftEye, Point faceRightEye)
{
// Sanity check eye location
if (false == origRect.Contains(origLeftEye) || false == origRect.Contains(origRightEye))
{
return(null);
}
// Step 1 - Construct the affine transformation
// Find mapping between orig and desired EyePosAsMatrix locations + a
// fake point located at right angles to the vector joing the two eyes
INumArray <float> origMat = ArrFactory.FloatArray(3, 2);
INumArray <float> faceMat = ArrFactory.FloatArray(3, 3);
EyePosAsMatrix(origRect, origLeftEye, origRightEye, ref origMat);
EyePosAsMatrix(faceRect, faceLeftEye, faceRightEye, ref faceMat);
faceMat[0, 2] = 1.0F;
faceMat[1, 2] = 1.0F;
faceMat[2, 2] = 1.0F;
SVDFloat svd = new SVDFloat(faceMat);
INumArray <float> sss = svd.Solve(origMat);
INumArray <float> mmm = (INumArray <float>)sss.Transpose();
double [,] affineMat = ArrFactory.DoubleArray(mmm).ToArray();
return(TransformImage(origImage, origRect, faceRect, affineMat, bytePerPix));
}