public void LLM_TransformIDCT_CompareToAccurate(int seed)
{
float[] sourceArray = Create8x8RoundedRandomFloatData(MinAllowedValue, MaxAllowedValue, seed);
var srcBlock = Block8x8F.Load(sourceArray);
// reference
Block8x8F expected = ReferenceImplementations.AccurateDCT.TransformIDCT(ref srcBlock);
// testee
// Part of the IDCT calculations is fused into the quantization step
// We must multiply input block with adjusted no-quantization matrix
// before applying IDCT
// Dequantization using unit matrix - no values are upscaled
Block8x8F dequantMatrix = CreateBlockFromScalar(1);
// This step is needed to apply adjusting multipliers to the input block
FastFloatingPointDCT.AdjustToIDCT(ref dequantMatrix);
// IDCT implementation tranforms blocks after transposition
srcBlock.TransposeInplace();
srcBlock.MultiplyInPlace(ref dequantMatrix);
// IDCT calculation
FastFloatingPointDCT.TransformIDCT(ref srcBlock);
this.CompareBlocks(expected, srcBlock, 1f);
}
public void LLM_IDCT_IsEquivalentTo_AccurateImplementation(int seed, int range)
{
float[] sourceArray = JpegFixture.Create8x8RoundedRandomFloatData(-range, range, seed);
var source = Block8x8F.Load(sourceArray);
Block8x8F expected = ReferenceImplementations.AccurateDCT.TransformIDCT(ref source);
Block8x8F actual = ReferenceImplementations.LLM_FloatingPoint_DCT.TransformIDCT(ref source);
this.CompareBlocks(expected, actual, 0.1f);
}
public void LLM_TransformIDCT_CompareToAccurate(int seed)
{
float[] sourceArray = Create8x8RoundedRandomFloatData(-1000, 1000, seed);
var srcBlock = Block8x8F.Load(sourceArray);
Block8x8F expected = ReferenceImplementations.AccurateDCT.TransformIDCT(ref srcBlock);
var temp = default(Block8x8F);
FastFloatingPointDCT.TransformIDCT(ref srcBlock, ref temp);
this.CompareBlocks(expected, srcBlock, 1f);
}
public void LLM_TransformIDCT_CompareToNonOptimized(int seed)
{
float[] sourceArray = Create8x8RoundedRandomFloatData(-1000, 1000, seed);
var source = Block8x8F.Load(sourceArray);
Block8x8F expected = ReferenceImplementations.LLM_FloatingPoint_DCT.TransformIDCT(ref source);
var temp = default(Block8x8F);
var actual = default(Block8x8F);
FastFloatingPointDCT.TransformIDCT(ref source, ref actual, ref temp);
this.CompareBlocks(expected, actual, 1f);
}
public void Setup()
{
var random = new Random();
float[] f = new float[8 * 8];
for (int i = 0; i < f.Length; i++)
{
f[i] = (float)random.NextDouble();
}
for (int i = 0; i < 4; i++)
{
this.target[i] = Block8x8F.Load(f);
}
this.source = Block8x8F.Load(f);
}
internal static Block8x8F CreateRoundedRandomFloatBlock(int minValue, int maxValue, int seed = 42) => Block8x8F.Load(Create8x8RoundedRandomFloatData(minValue, maxValue, seed));
