/// <summary>
/// Computes a sum of the values in the array starting at (<paramref name="row"/>, <paramref name="column"/>) in <paramref name="channel" />
/// in a rectangle described by the offset and size in <paramref name="rect"/>.
/// </summary>
/// <param name="handler">The handler used to perform the operation</param>
/// <param name="row">Reference row</param>
/// <param name="column">Reference column</param>
/// <param name="channel">Channel to draw values from</param>
/// <param name="rect">Offset and size of the rectangle</param>
/// <returns>The sum of all values in the rectangle</returns>
public static T ComputeRectangleSum <T>(this IArrayHandler <T> handler, int row, int column, int channel, Rectangle rect)
{
int startRow = row + rect.Top;
int startColumn = column + rect.Left;
int rows = rect.Height;
int columns = rect.Width;
return(handler.ComputeRectangleSum(startRow, startColumn, rows, columns, channel));
}
public float Compute(ImageDataPoint <float> point)
{
if (point.ImageID != _currentID)
{
_currentID = point.ImageID;
if (point.Image.IsIntegral || DecisionTree <ImageDataPoint <float>, float[]> .IsBuilding)
{
_integralImage = point.Image;
}
else
{
_integralImage = IntegralImage.ComputeFloat <FloatArrayHandler>(point.Image);
}
}
int row = point.Row;
int column = point.Column;
float sum = _integralImage.ComputeRectangleSum(row, column, _channel, _rect);
Debug.Assert(!float.IsNaN(sum), "Rectangle sum is NaN");
return(sum);
}