Rotate image using nearest neighbor algorithm.
The class implements image rotation filter using nearest neighbor algorithm, which does not assume any interpolation.
The filter accepts 8/16 bpp grayscale images and 24/48 bpp color image for processing.
Sample usage:
// create filter - rotate for 30 degrees keeping original image size RotateNearestNeighbor filter = new RotateNearestNeighbor( 30, true ); // apply the filter Bitmap newImage = filter.Apply( image ); Initial image:
Result image:
private void SetFilter()
{
ImageType = ImageTypes.Rgb24bpp;
switch (mode)
{
case Modes.Bicubic:
Af.RotateBicubic newFilterA = new Af.RotateBicubic(angle);
newFilterA.FillColor = color;
newFilterA.KeepSize = keepSize;
imageFilter = newFilterA;
break;
case Modes.Bilinear:
Af.RotateBilinear newFilterB = new Af.RotateBilinear(angle);
newFilterB.FillColor = color;
newFilterB.KeepSize = keepSize;
imageFilter = newFilterB;
break;
case Modes.Nearest:
Af.RotateNearestNeighbor newFilterC = new Af.RotateNearestNeighbor(angle);
newFilterC.FillColor = color;
newFilterC.KeepSize = keepSize;
imageFilter = newFilterC;
break;
}
}
public static bool RotateTest32bpp(IFilter filter, Bitmap input, Bitmap output)
{
var itm = new ImageToMatrix();
// Test directly
Color[,] actual;
itm.Convert(filter.Apply(input), out actual);
Color[,] expected;
itm.Convert(output, out expected);
if (!actual.IsEqual(expected))
{
return(false);
}
// Rotate and re-test
var rotate = new RotateNearestNeighbor(90, false);
input = rotate.Apply(input);
output = rotate.Apply(output);
itm.Convert(filter.Apply(input), out actual);
itm.Convert(output, out expected);
return(actual.IsEqual(expected));
}
public static bool RotateTest32bpp(IFilter filter, Bitmap input, Bitmap output)
{
var itm = new ImageToMatrix();
// Test directly
Color[,] actual;
itm.Convert(filter.Apply(input), out actual);
Color[,] expected;
itm.Convert(output, out expected);
if (!actual.IsEqual(expected))
return false;
// Rotate and re-test
var rotate = new RotateNearestNeighbor(90, false);
input = rotate.Apply(input);
output = rotate.Apply(output);
itm.Convert(filter.Apply(input), out actual);
itm.Convert(output, out expected);
return actual.IsEqual(expected);
}
