/// <summary>
/// Adds a new image to the image set.
/// </summary>
/// <param name="nIdx">Specifies the index on where to add the image.</param>
/// <param name="d">Specifies the image data.</param>
/// <returns>If added successfully within the load limit, <i>true</i> is returned, otherwise <i>false</i> is returned.</returns>
public bool Add(int nIdx, SimpleDatum d)
{
if (m_nLoadLimit > 0 && m_rgImagesLimitLoaded.Count == m_nLoadLimit)
{
return(false);
}
m_rgImages[nIdx] = d;
m_nLoadedCount++;
if (m_nLoadLimit > 0)
{
m_rgImagesLimitLoaded.Add(d);
}
bool bAdded = false;
foreach (LabelSet ls in m_rgLabelSet)
{
if (ls.Label.ActiveLabel == d.Label)
{
ls.Add(d);
bAdded = true;
break;
}
}
if (!bAdded)
{
LabelSet ls = new LabelSet(new LabelDescriptor(d.Label, d.Label, "label #" + d.Label.ToString(), 0));
ls.Add(d);
m_rgLabelSet.Add(ls);
}
return(true);
}
/// <summary>
/// Returns the image based on its label and image selection method.
/// </summary>
/// <param name="nIdx">Specifies the image index to use when loading sequentially.</param>
/// <param name="labelSelectionMethod">Specifies the label selection method.</param>
/// <param name="imageSelectionMethod">Specifies the image selection method.</param>
/// <param name="log">Specifies the Log for status output.</param>
/// <returns>The SimpleDatum containing the image is returned.</returns>
public SimpleDatum GetImage(int nIdx, IMGDB_LABEL_SELECTION_METHOD labelSelectionMethod, IMGDB_IMAGE_SELECTION_METHOD imageSelectionMethod, Log log)
{
lock (m_syncObj)
{
SimpleDatum[] rgImages = m_rgImages;
if (m_nLoadLimit > 0 && m_rgImagesLimitLoaded.Count == m_nLoadLimit)
{
rgImages = m_rgImagesLimitLoaded.ToArray();
}
if (rgImages.Length == 0)
{
throw new Exception("There are no images in the dataset '" + m_src.Name + "' to select from!");
}
SimpleDatum sd = null;
if ((labelSelectionMethod & IMGDB_LABEL_SELECTION_METHOD.RANDOM) == IMGDB_LABEL_SELECTION_METHOD.RANDOM)
{
if (m_rgLabelSet.Count == 0)
{
throw new Exception("There are no label specified in the Labels table for the dataset '" + m_src.Name + "'!");
}
LabelSet labelSet = getLabelSet(labelSelectionMethod);
sd = labelSet.GetImage(nIdx, imageSelectionMethod);
}
int nImageIdx = 0;
if (sd == null)
{
sd = LabelSet.GetImage(rgImages, rgImages.Length, nIdx, m_random, imageSelectionMethod, ref m_nLastIdx, ref m_nFixedIndex, out nImageIdx);
}
//-----------------------------------------
// Handle dynamic loading of the image.
//-----------------------------------------
if (sd == null)
{
int nRetries = 1;
if ((imageSelectionMethod & IMGDB_IMAGE_SELECTION_METHOD.RANDOM) == IMGDB_IMAGE_SELECTION_METHOD.RANDOM)
{
nRetries = 5;
}
for (int i = 0; i < nRetries; i++)
{
sd = m_factory.LoadImageAt(nImageIdx);
if (sd != null)
{
Add(nImageIdx, sd);
break;
}
if (i < nRetries - 1)
{
nImageIdx = m_random.Next(rgImages.Length);
}
}
if (sd == null)
{
log.WriteLine("WARNING! The dataset needs to be re-indexed. Could not find the image at index " + nImageIdx.ToString() + " - attempting several random queries to get an image.");
}
}
return(sd);
}
}
