List <float> ExtractSiftFeatureVector(TaggedImage image, int keyPointCount, SiftSortingMethod sortingMethod, bool doDrawImage)
{
List <float> result = new List <float>(5 * keyPointCount);
return(result);
}
List <float> ExtractSiftFeatureVector(TaggedImage image, int keyPointCount, SiftSortingMethod sortingMethod, bool doDrawImage)
{
// use the emgu functions to gather keypoints
VectorOfKeyPoint vectorOfKeypoints = new VectorOfKeyPoint();
Mat output = image.GetMat().Clone(); // only needed for drawing
sift.DetectAndCompute(image.GetMat(), null, vectorOfKeypoints, output, false);
// put it into useful data formats
List <MKeyPoint> keyPoints = new List <MKeyPoint>(vectorOfKeypoints.ToArray());
// sort
switch (sortingMethod)
{
case SiftSortingMethod.Response:
keyPoints.Sort((p1, p2) => p1.Response < p2.Response ? 1 : (p1.Response == p2.Response ? 0 : -1));
break;
case SiftSortingMethod.Size:
keyPoints.Sort((p1, p2) => p1.Size < p2.Size ? 1 : (p1.Size == p2.Size ? 0 : -1));
break;
case SiftSortingMethod.None:
default:
break;
}
// expand/trim
while (keyPoints.Count < keyPointCount)
{
keyPoints.Add(new MKeyPoint());
}
if (keyPoints.Count > keyPointCount)
{
keyPoints.RemoveRange(keyPointCount, keyPoints.Count - keyPointCount);
}
// visualize
if (doDrawImage)
{
vectorOfKeypoints = new VectorOfKeyPoint(keyPoints.ToArray());
Features2DToolbox.DrawKeypoints(image.GetMat(), vectorOfKeypoints, output, new Bgr(0, 0, 255), Features2DToolbox.KeypointDrawType.DrawRichKeypoints);
String win1 = "SIFT"; //The name of the window
CvInvoke.NamedWindow(win1); //Create the window using the specific name
CvInvoke.Imshow(win1, output); //Show the image
CvInvoke.WaitKey(0); //Wait for the key pressing event
CvInvoke.DestroyWindow(win1); //Destroy the window if key is pressed
}
// convert to list
List <float> result = new List <float>(5 * keyPointCount);
for (int i = 0; i < keyPoints.Count; ++i)
{
MKeyPoint current = keyPoints[i];
result.Add(current.Point.X / (float)output.Size.Width);
result.Add(current.Point.Y / (float)output.Size.Height);
result.Add(current.Size);
result.Add(current.Angle);
result.Add(current.Response);
}
return(result);
}
public override void InitializeViaConfig(ImageUnderstandingConfig config)
{
_siftKeyPointCount = config.SIFTInitializationData.siftKeyPointCount;
_sortingMethod = config.SIFTInitializationData.sortingMethod;
}
