public static BinarizedImage DownScaleImage(BinarizedImage a_rBinarizedImage, int a_iHorizontalSubDivs, int a_iVerticalSubDivs)
{
int iImageWidth = a_rBinarizedImage.Width;
int iImageHeight = a_rBinarizedImage.Height;
int iGridSubDivPerRow = (a_iVerticalSubDivs + 1);
int iGridSubDivPerColumn = (a_iHorizontalSubDivs + 1);
int iGridSubDivCount = iGridSubDivPerRow * iGridSubDivPerColumn;
// Grid div dimensions
float fGridSubDivPixelWidth = ((float)iImageWidth) / (float)iGridSubDivPerRow;
float fGridSubDivPixelHeight = ((float)iImageHeight) / (float)iGridSubDivPerColumn;
BinarizedImage oResizedBinarizedImage = new BinarizedImage(iGridSubDivPerRow, iGridSubDivPerColumn, false);
// Iterate grid divs
for (int iGridSubDivIndex = 0; iGridSubDivIndex < iGridSubDivCount; ++iGridSubDivIndex)
{
// ( X, Y ) grid div pos from grid div index (in grid div space)
int iGridSubDivX = iGridSubDivIndex % iGridSubDivPerRow;
int iGridSubDivY = iGridSubDivIndex / iGridSubDivPerRow;
// Compute the pixel bounds for this subdivision
int iStartX = Mathf.FloorToInt(iGridSubDivX * fGridSubDivPixelWidth);
int iStartY = Mathf.FloorToInt(iGridSubDivY * fGridSubDivPixelHeight);
int iEndX = Mathf.CeilToInt((iGridSubDivX + 1) * fGridSubDivPixelWidth);
int iEndY = Mathf.CeilToInt((iGridSubDivY + 1) * fGridSubDivPixelHeight);
int iWidth = iEndX - iStartX;
int iHeight = iEndY - iStartY;
// Set grid sub div as empty while no significant pixel found
bool bEmptyGridSubDiv = true;
float fGridSubDivAlphaMean = 0.0f;
for (int iY = 0; iY < iHeight; ++iY)
{
for (int iX = 0; iX < iWidth; ++iX)
{
int iPixelIndex = a_rBinarizedImage.Coords2PixelIndex(iX + iStartX, iY + iStartY);
// At least one pixel is significant => need to create the whole grid div
if (a_rBinarizedImage[iPixelIndex])
{
bEmptyGridSubDiv = false;
}
fGridSubDivAlphaMean += a_rBinarizedImage.GetAlphaValue(iPixelIndex);
}
}
fGridSubDivAlphaMean /= iHeight * iWidth;
int iResizedIndex = oResizedBinarizedImage.Coords2PixelIndex(iGridSubDivX, iGridSubDivY);
oResizedBinarizedImage.SetInternalPixel(iResizedIndex, !bEmptyGridSubDiv, fGridSubDivAlphaMean);
}
return(oResizedBinarizedImage);
}
public static BinarizedImage DownScaleImage(BinarizedImage a_rBinarizedImage, int a_iHorizontalSubDivs, int a_iVerticalSubDivs)
{
int iImageWidth = a_rBinarizedImage.Width;
int iImageHeight = a_rBinarizedImage.Height;
int iGridSubDivPerRow = ( a_iVerticalSubDivs + 1 );
int iGridSubDivPerColumn = ( a_iHorizontalSubDivs + 1 );
int iGridSubDivCount = iGridSubDivPerRow * iGridSubDivPerColumn;
// Grid div dimensions
float fGridSubDivPixelWidth = ( (float) iImageWidth ) / (float) iGridSubDivPerRow;
float fGridSubDivPixelHeight = ( (float) iImageHeight ) / (float) iGridSubDivPerColumn;
BinarizedImage oResizedBinarizedImage = new BinarizedImage( iGridSubDivPerRow, iGridSubDivPerColumn, false );
// Iterate grid divs
for( int iGridSubDivIndex = 0; iGridSubDivIndex < iGridSubDivCount; ++iGridSubDivIndex )
{
// ( X, Y ) grid div pos from grid div index (in grid div space)
int iGridSubDivX = iGridSubDivIndex % iGridSubDivPerRow;
int iGridSubDivY = iGridSubDivIndex / iGridSubDivPerRow;
// Compute the pixel bounds for this subdivision
int iStartX = Mathf.FloorToInt(iGridSubDivX * fGridSubDivPixelWidth);
int iStartY = Mathf.FloorToInt(iGridSubDivY * fGridSubDivPixelHeight);
int iEndX = Mathf.CeilToInt((iGridSubDivX + 1) * fGridSubDivPixelWidth);
int iEndY = Mathf.CeilToInt((iGridSubDivY + 1) * fGridSubDivPixelHeight);
int iWidth = iEndX - iStartX;
int iHeight = iEndY - iStartY;
// Set grid sub div as empty while no significant pixel found
bool bEmptyGridSubDiv = true;
float fGridSubDivAlphaMean = 0.0f;
for( int iY = 0; iY < iHeight; ++iY )
{
for( int iX = 0; iX < iWidth; ++iX )
{
int iPixelIndex = a_rBinarizedImage.Coords2PixelIndex( iX + iStartX, iY + iStartY );
// At least one pixel is significant => need to create the whole grid div
if( a_rBinarizedImage[ iPixelIndex ] )
{
bEmptyGridSubDiv = false;
}
fGridSubDivAlphaMean += a_rBinarizedImage.GetAlphaValue(iPixelIndex);
}
}
fGridSubDivAlphaMean /= iHeight * iWidth;
int iResizedIndex = oResizedBinarizedImage.Coords2PixelIndex( iGridSubDivX, iGridSubDivY );
oResizedBinarizedImage.SetInternalPixel(iResizedIndex, !bEmptyGridSubDiv, fGridSubDivAlphaMean);
}
return oResizedBinarizedImage;
}
