public void TestApplyThresholdValue(string sourceResourcePath)
{
// Load source image
using Image sourceImage = TestImage.FromResource(sourceResourcePath);
Assert.IsNotNull(sourceImage);
// Apply threshold
using Image thresholdImage = ImageThreshold.Apply(sourceImage, 0x40);
Assert.IsNotNull(thresholdImage);
byte[] withoutAlphaBytes = RemoveAlphaLayerBytes(ImageBytes.FromImage(thresholdImage), sourceImage.PixelFormat);
// Check bytes thresholded
Assert.IsTrue(withoutAlphaBytes.Take(sourceImage.Width).All(b => b == byte.MinValue || b == byte.MaxValue));
}
public void TestApplyMin(string sourceResourcePath)
{
// Load source image
using Image sourceImage = TestImage.FromResource(sourceResourcePath);
Assert.IsNotNull(sourceImage);
// Apply min value
using Image minImage = ImageThreshold.ApplyMin(sourceImage, 0x20);
Assert.IsNotNull(minImage);
byte[] withoutAlphaBytes = RemoveAlphaLayerBytes(ImageBytes.FromImage(minImage), sourceImage.PixelFormat);
// Check all greater than value
Assert.IsTrue(withoutAlphaBytes.All(b => b >= 0x20));
}
public void TestApplyMinMax(string sourceResourcePath)
{
// Load source image
using Image sourceImage = TestImage.FromResource(sourceResourcePath);
Assert.IsNotNull(sourceImage);
// Apply min/max value
using Image minMaxImage = ImageThreshold.ApplyMinMax(sourceImage, 0x25, 0xc3);
Assert.IsNotNull(minMaxImage);
byte[] withoutAlphaBytes = RemoveAlphaLayerBytes(ImageBytes.FromImage(minMaxImage), sourceImage.PixelFormat);
// Check all within range
Assert.IsTrue(withoutAlphaBytes.All(b => b >= 0x25 && b <= 0xc3));
}
public void TestOtsuThreshold(string sourceResourcePath, string resultResourcePath)
{
// Load source image
using Image sourceImage = TestImage.FromResource(sourceResourcePath);
Assert.IsNotNull(sourceImage);
// Apply Thresholding
using Image thresholdImage = ImageThreshold.ApplyOtsuMethod(sourceImage);
Assert.IsNotNull(thresholdImage);
// Load correct result image
using Image resultImage = TestImage.FromResource(resultResourcePath);
Assert.IsNotNull(resultImage);
// Compare images
Assert.IsTrue(TestImage.Compare(thresholdImage, resultImage));
}