/// <summary>
/// Downsamples depth image using the row and column scaling steps
/// </summary>
/// <param name="depthCamState">Depth cam sensor state with original image buffer</param>
/// <param name="targetDepthImage">Target buffer for downsampled image</param>
/// <param name="columnStep">Column sampling interval</param>
/// <param name="rowStep">Row sampling interval</param>
public static void DownSampleDepthImage(
DepthCamSensorState depthCamState,
short[] targetDepthImage,
int columnStep,
int rowStep)
{
DownSampleDepthImageInternal(depthCamState, targetDepthImage, columnStep, rowStep);
}
/// <summary>
/// Downsamples depth image using the row and column scaling steps
/// </summary>
/// <param name="depthCamState">Depth cam sensor state with original image buffer</param>
/// <param name="targetDepthImage">Target buffer for downsampled image</param>
/// <param name="columnStep">Column sampling interval</param>
/// <param name="rowStep">Row sampling interval</param>
private static unsafe void DownSampleDepthImageInternal(
DepthCamSensorState depthCamState,
short[] targetDepthImage,
int columnStep,
int rowStep)
{
int downSampledWidth = depthCamState.DepthImageSize.Width / columnStep;
fixed(short *depthImagePointer = &depthCamState.DepthImage[0])
{
fixed(short *depthImageTargetPointer = &targetDepthImage[0])
{
for (int y = 0; y < depthCamState.DepthImageSize.Height; y += rowStep)
{
for (int x = 0; x < depthCamState.DepthImageSize.Width; x += columnStep)
{
int targetOffset = ((y / rowStep) * downSampledWidth) + (x / columnStep);
int sourceOffset = (y * depthCamState.DepthImageSize.Width) + x;
depthImageTargetPointer[targetOffset] = depthImagePointer[sourceOffset];
}
}
}
}
}