/// <summary>
/// Extracts annotated samples - their bounding boxes.
/// </summary>
/// <param name="labelMatch">Regular expression for valid label.</param>
private void extractPositives(Regex labelMatch)
{
if (database == null || capture == null || imageKeyFunc == null)
{
return; //form not initialized
}
var currPos = capture.Position;
for (int i = 0; i < capture.Length; i++)
{
var imgKey = imageKeyFunc(i);
if (database.ContainsKey(imgKey))
{
capture.Seek(i, SeekOrigin.Begin);
var imgName = (capture as ImageDirectoryReader).CurrentImageName;
var img = capture.Read();
var labelCounter = new Dictionary <string, int>();
foreach (var annotation in database[imgKey])
{
if (labelMatch.IsMatch(annotation.Label) == false)
{
continue;
}
//**************** get current label instance index ***************/
if (labelCounter.ContainsKey(annotation.Label) == false)
{
labelCounter.Add(annotation.Label, 0);
}
labelCounter[annotation.Label]++;
var label = annotation.Label;
if (labelCounter[annotation.Label] > 1)
{
label += " " + "(" + labelCounter[annotation.Label] + ")";
}
//**************** get current label instance index ***************/
var databaseDir = imgName.Replace(imgKey, String.Empty);
var samplePath = getOutputImageName(databaseDir, imgKey, label);
Directory.CreateDirectory(Path.GetDirectoryName(samplePath));
var sampleImg = img.GetSubRect(annotation.BoundingRectangle);
//sampleImg = (sampleImg as Image<Bgr, byte>).SmoothGaussian(5);
ImageIO.TrySave(sampleImg, samplePath);
}
}
}
capture.Seek(currPos, SeekOrigin.Begin);
}
public void Start(Action <float> onFrameCompletition)
{
if (imageSource.CanSeek)
{
imageSource.Seek(0, SeekOrigin.Begin);
}
var idx = 0;
foreach (var frame in imageSource) //use video stream as IEnumerable<IImage> (must support seek operation)
{
if (frame != null) //some videos skip key frames (discard those frames)
{
var path = Path.Combine(outputDir, String.Format(fileNameFormat, idx));
ImageIO.TrySave(frame, path); //TODO-noncritical: add compression options
}
onFrameCompletition((float)(idx + 1) / imageSource.Length);
idx++;
}
}