public void RunDumpJpegCoeffsTool()
{
if (!TestEnvironment.IsWindows)
{
return;
}
string inputFile = TestFile.GetInputFileFullPath(TestImages.Jpeg.Progressive.Progress);
string outputDir = TestEnvironment.CreateOutputDirectory(nameof(SpectralJpegTests));
string outputFile = Path.Combine(outputDir, "progress.dctdump");
LibJpegTools.RunDumpJpegCoeffsTool(inputFile, outputFile);
Assert.True(File.Exists(outputFile));
}
private void VerifySpectralCorrectnessImpl <TPixel>(
TestImageProvider <TPixel> provider,
LibJpegTools.SpectralData imageSharpData)
where TPixel : unmanaged, IPixel <TPixel>
{
LibJpegTools.SpectralData libJpegData = LibJpegTools.ExtractSpectralData(provider.SourceFileOrDescription);
bool equality = libJpegData.Equals(imageSharpData);
this.Output.WriteLine("Spectral data equality: " + equality);
int componentCount = imageSharpData.ComponentCount;
if (libJpegData.ComponentCount != componentCount)
{
throw new Exception("libJpegData.ComponentCount != componentCount");
}
double averageDifference = 0;
double totalDifference = 0;
double tolerance = 0;
this.Output.WriteLine("*** Differences ***");
for (int i = 0; i < componentCount; i++)
{
LibJpegTools.ComponentData libJpegComponent = libJpegData.Components[i];
LibJpegTools.ComponentData imageSharpComponent = imageSharpData.Components[i];
(double total, double average)diff = LibJpegTools.CalculateDifference(libJpegComponent, imageSharpComponent);
this.Output.WriteLine($"Component{i}: {diff}");
averageDifference += diff.average;
totalDifference += diff.total;
tolerance += libJpegComponent.SpectralBlocks.GetSingleSpan().Length;
}
averageDifference /= componentCount;
tolerance /= 64; // fair enough?
this.Output.WriteLine($"AVERAGE: {averageDifference}");
this.Output.WriteLine($"TOTAL: {totalDifference}");
this.Output.WriteLine($"TOLERANCE = totalNumOfBlocks / 64 = {tolerance}");
Assert.True(totalDifference < tolerance);
}
public void ExtractSpectralData <TPixel>(TestImageProvider <TPixel> provider)
where TPixel : struct, IPixel <TPixel>
{
if (!TestEnvironment.IsWindows)
{
return;
}
string testImage = provider.SourceFileOrDescription;
LibJpegTools.SpectralData data = LibJpegTools.ExtractSpectralData(testImage);
Assert.True(data.ComponentCount == 3);
Assert.True(data.Components.Length == 3);
VerifyJpeg.SaveSpectralImage(provider, data);
// I knew this one well:
if (testImage == TestImages.Jpeg.Progressive.Progress)
{
VerifyJpeg.VerifyComponentSizes3(data.Components, 43, 61, 22, 31, 22, 31);
}
}
