/// <summary>
/// The ApplyDistort method applies the distortion policy to the simple datum.
/// </summary>
/// <param name="sd">Specifies the SimpleDatum to distort.</param>
/// <param name="p">Specifies the distortion parameters that define the distortion policy.</param>
/// <returns>The distorted SimpleDatum is returned.</returns>
public SimpleDatum ApplyDistort(SimpleDatum sd, DistortionParameter p)
{
double dfProb = m_random.NextDouble();
Bitmap bmp = ImageData.GetImage(sd);
if (dfProb > 0.5)
{
bmp = randomBrightness(bmp, p.brightness_prob, p.brightness_delta);
bmp = randomContrast(bmp, p.contrast_prob, p.contrast_lower, p.contrast_upper);
bmp = randomSaturation(bmp, p.saturation_prob, p.saturation_lower, p.saturation_upper);
}
else
{
bmp = randomBrightness(bmp, p.brightness_prob, p.brightness_delta);
bmp = randomSaturation(bmp, p.saturation_prob, p.saturation_lower, p.saturation_upper);
bmp = randomContrast(bmp, p.contrast_prob, p.contrast_lower, p.contrast_upper);
}
SimpleDatum sd1 = ImageData.GetImageData(bmp, sd.Channels, sd.IsRealData, sd.Label);
if (sd1.IsRealData)
{
sd.SetData(sd1.RealData.ToList(), sd.Label);
}
else
{
sd.SetData(sd1.ByteData.ToList(), sd.Label);
}
return(randomChannelOrder(sd, p.random_order_prob));
}
/// <summary>
/// Crop the SimpleDatum according to the bbox.
/// </summary>
/// <param name="d">Specifies the SimpleDatum to crop.</param>
/// <param name="bbox">Specifies the bounding box.</param>
/// <returns>The cropped SimpleDatum is returned.</returns>
public SimpleDatum CropImage(SimpleDatum d, NormalizedBBox bbox)
{
int nDatumChannels = d.Channels;
int nDatumHeight = d.Height;
int nDatumWidth = d.Width;
// Get the bbox dimension.
NormalizedBBox clipped_bbox = m_bbox.Clip(bbox);
NormalizedBBox scaled_bbox = m_bbox.Scale(bbox, nDatumHeight, nDatumWidth);
int w_off = (int)scaled_bbox.xmin;
int h_off = (int)scaled_bbox.ymin;
int width = (int)(scaled_bbox.xmax - scaled_bbox.xmin);
int height = (int)(scaled_bbox.ymax - scaled_bbox.ymin);
// Crop the image using bbox.
SimpleDatum crop_datum = new SimpleDatum(d, height, width);
int nCropDatumSize = nDatumChannels * height * width;
if (d.IsRealData)
{
double[] rgData = new double[nCropDatumSize];
for (int h = h_off; h < h_off + height; h++)
{
for (int w = w_off; w < w_off + width; w++)
{
for (int c = 0; c < nDatumChannels; c++)
{
int nDatumIdx = (c * nDatumHeight + h) * nDatumWidth + w;
int nCropDatumIdx = (c * height + h - h_off) * width + w - w_off;
rgData[nCropDatumIdx] = d.RealData[nDatumIdx];
}
}
}
crop_datum.SetData(rgData.ToList(), d.Label);
}
else
{
byte[] rgData = new byte[nCropDatumSize];
for (int h = h_off; h < h_off + height; h++)
{
for (int w = w_off; w < w_off + width; w++)
{
for (int c = 0; c < nDatumChannels; c++)
{
int nDatumIdx = (c * nDatumHeight + h) * nDatumWidth + w;
int nCropDatumIdx = (c * height + h - h_off) * width + w - w_off;
rgData[nCropDatumIdx] = d.ByteData[nDatumIdx];
}
}
}
crop_datum.SetData(rgData.ToList(), d.Label);
}
return(crop_datum);
}
/// <summary>
/// The ApplyDistort method applies the distortion policy to the simple datum.
/// </summary>
/// <param name="sd">Specifies the SimpleDatum to distort.</param>
/// <param name="p">Specifies the distortion parameters that define the distortion policy.</param>
/// <returns>The distorted SimpleDatum is returned.</returns>
public SimpleDatum ApplyDistort(SimpleDatum sd, DistortionParameter p)
{
double dfProb = m_random.NextDouble();
Bitmap bmp = ImageData.GetImage(sd);
if (dfProb > 0.5)
{
bmp = randomBrightnessContrastSaturation(bmp, p.brightness_prob, p.brightness_delta, p.contrast_prob, p.contrast_lower, p.contrast_upper, p.saturation_prob, p.saturation_lower, p.saturation_upper);
}
else
{
bmp = randomBrightnessSaturationContrast(bmp, p.brightness_prob, p.brightness_delta, p.contrast_prob, p.contrast_lower, p.contrast_upper, p.saturation_prob, p.saturation_lower, p.saturation_upper);
}
SimpleDatum sd1 = ImageData.GetImageData(bmp, sd);
sd.SetData(sd1);
bmp.Dispose();
return(randomChannelOrder(sd, p.random_order_prob));
}
/// <summary>
/// Expand the SimpleDatum according to the bbox.
/// </summary>
/// <param name="d">Specifies the SimpleDatum to expand.</param>
/// <param name="expand_bbox">Specifies the bounding box.</param>
/// <param name="fExpandRatio">Specifies the expansion ratio.</param>
/// <returns>The expanded SimpleDatum is returned.</returns>
public SimpleDatum ExpandImage(SimpleDatum d, NormalizedBBox expand_bbox, float fExpandRatio)
{
int nDatumChannels = d.Channels;
int nDatumHeight = d.Height;
int nDatumWidth = d.Width;
// Get the bbox dimension.
int width = (int)(nDatumHeight * fExpandRatio);
int height = (int)(nDatumWidth * fExpandRatio);
float h_off = (float)m_random.NextDouble();
float w_off = (float)m_random.NextDouble();
h_off = (float)Math.Floor(h_off);
w_off = (float)Math.Floor(w_off);
expand_bbox.xmin = -w_off / nDatumWidth;
expand_bbox.ymin = -h_off / nDatumHeight;
expand_bbox.xmax = (width - w_off) / nDatumWidth;
expand_bbox.ymax = (height - h_off) / nDatumHeight;
// Crop the image using bbox.
SimpleDatum expand_datum = new SimpleDatum(d, height, width);
int nExpandDatumSize = nDatumChannels * height * width;
if (d.IsRealData)
{
double[] rgData = new double[nExpandDatumSize];
for (int h = (int)h_off; h < (int)h_off + nDatumHeight; h++)
{
for (int w = (int)w_off; w < (int)w_off + nDatumWidth; w++)
{
for (int c = 0; c < nDatumChannels; c++)
{
int nDatumIdx = (int)((c * nDatumHeight + h - h_off) * nDatumWidth + w - w_off);
int nExpandIdx = (c * height + h) * width + w;
rgData[nExpandIdx] = d.RealData[nDatumIdx];
}
}
}
expand_datum.SetData(rgData.ToList(), d.Label);
}
else
{
byte[] rgData = new byte[nExpandDatumSize];
for (int h = (int)h_off; h < (int)h_off + nDatumHeight; h++)
{
for (int w = (int)w_off; w < (int)w_off + nDatumWidth; w++)
{
for (int c = 0; c < nDatumChannels; c++)
{
int nDatumIdx = (int)((c * nDatumHeight + h - h_off) * nDatumWidth + w - w_off);
int nExpandIdx = (c * height + h) * width + w;
rgData[nExpandIdx] = d.ByteData[nDatumIdx];
}
}
}
expand_datum.SetData(rgData.ToList(), d.Label);
}
return(expand_datum);
}