/// <summary> <p>Attempts to locate an alignment pattern in a limited region of the image, which is
/// guessed to contain it. This method uses {@link AlignmentPattern}.</p>
///
/// </summary>
/// <param name="overallEstModuleSize">estimated module size so far
/// </param>
/// <param name="estAlignmentX">x coordinate of center of area probably containing alignment pattern
/// </param>
/// <param name="estAlignmentY">y coordinate of above
/// </param>
/// <param name="allowanceFactor">number of pixels in all directions to search from the center
/// </param>
/// <returns> {@link AlignmentPattern} if found, or null otherwise
/// </returns>
/// <throws> ReaderException if an unexpected error occurs during detection </throws>
protected internal virtual AlignmentPattern findAlignmentInRegion(float overallEstModuleSize, int estAlignmentX, int estAlignmentY, float allowanceFactor)
{
// Look for an alignment pattern (3 modules in size) around where it
// should be
//UPGRADE_WARNING: Data types in Visual C# might be different. Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
int allowance = (int) (allowanceFactor * overallEstModuleSize);
int alignmentAreaLeftX = System.Math.Max(0, estAlignmentX - allowance);
int alignmentAreaRightX = System.Math.Min(image.Width - 1, estAlignmentX + allowance);
if (alignmentAreaRightX - alignmentAreaLeftX < overallEstModuleSize * 3)
{
throw ReaderException.Instance;
}
int alignmentAreaTopY = System.Math.Max(0, estAlignmentY - allowance);
int alignmentAreaBottomY = System.Math.Min(image.Height - 1, estAlignmentY + allowance);
AlignmentPatternFinder alignmentFinder = new AlignmentPatternFinder(image, alignmentAreaLeftX, alignmentAreaTopY, alignmentAreaRightX - alignmentAreaLeftX, alignmentAreaBottomY - alignmentAreaTopY, overallEstModuleSize, resultPointCallback);
return alignmentFinder.find();
}
/// <summary> <p>Attempts to locate an alignment pattern in a limited region of the image, which is
/// guessed to contain it. This method uses {@link AlignmentPattern}.</p>
///
/// </summary>
/// <param name="overallEstModuleSize">estimated module size so far
/// </param>
/// <param name="estAlignmentX">x coordinate of center of area probably containing alignment pattern
/// </param>
/// <param name="estAlignmentY">y coordinate of above
/// </param>
/// <param name="allowanceFactor">number of pixels in all directions to search from the center
/// </param>
/// <returns> {@link AlignmentPattern} if found, or null otherwise
/// </returns>
/// <throws> ReaderException if an unexpected error occurs during detection </throws>
protected internal virtual AlignmentPattern findAlignmentInRegion(float overallEstModuleSize, int estAlignmentX,
int estAlignmentY, float allowanceFactor)
{
// Look for an alignment pattern (3 modules in size) around where it
// should be
var allowance = (int) (allowanceFactor*overallEstModuleSize);
int alignmentAreaLeftX = Math.Max(0, estAlignmentX - allowance);
int alignmentAreaRightX = Math.Min(image.Width - 1, estAlignmentX + allowance);
if (alignmentAreaRightX - alignmentAreaLeftX < overallEstModuleSize*3)
{
throw ReaderException.Instance;
}
int alignmentAreaTopY = Math.Max(0, estAlignmentY - allowance);
int alignmentAreaBottomY = Math.Min(image.Height - 1, estAlignmentY + allowance);
var alignmentFinder = new AlignmentPatternFinder(image, alignmentAreaLeftX, alignmentAreaTopY,
alignmentAreaRightX - alignmentAreaLeftX,
alignmentAreaBottomY - alignmentAreaTopY,
overallEstModuleSize, resultPointCallback);
return alignmentFinder.find();
}
