private static IEnumerable<string> TryDeduceMatchingCandidateSnapshot(
ImageWrapper transformedOriginalSnapshot,
IEnumerable<string> candidateSnapshots,
Func<ImageWrapper, Maybe<ImageWrapper>> candidateTranform
)
{
var candidateResultList = new ConcurrentBag<Tuple<string, int>>();
using (var originaImageAsLockbit = new LockBitImage(transformedOriginalSnapshot.Image))
{
Parallel.ForEach(candidateSnapshots, candidateSnapshot =>
{
var candidateComparisonResult = from loadedCandidateSnapshot in TryLoadImage(candidateSnapshot)
from transformedCandidate in candidateTranform.Invoke(loadedCandidateSnapshot)
let candidateLockbitImage = new LockBitImage(transformedCandidate.Image)
let similarityIndex = SimilarityCalculator.CalculateSimilarityIndex(
originaImageAsLockbit,
candidateLockbitImage
)
select CommonFunctions.ExecThenDispose(
() => Tuple.Create<string, int>(candidateSnapshot, similarityIndex),
loadedCandidateSnapshot,
transformedCandidate,
candidateLockbitImage
);
candidateComparisonResult.Apply(i => candidateResultList.Add(i));
});
}
return from candidateTuple in candidateResultList
where candidateTuple.Item2 >= 69
select candidateTuple.Item1;
}
private static Maybe<ImageWrapper> TransformCandidateSnapshotForiPhoneSix(ImageWrapper candidateSnapshot)
{
return from resizedCandidateSnapshot in ImageTransformations.TryResizeImage(candidateSnapshot.Image, 1334, 750)
select ImageCropper.TryCropiPhoneSixImage(
new ImageWrapper(resizedCandidateSnapshot, candidateSnapshot.ImagePath)
);
}
/// <summary>
/// Try to crop a snapshot taken from an iPhone 6
/// </summary>
/// <param name="originalImage">The original snapshot from the iPhone 6</param>
/// <returns>A new image with the top scrubber and bottom controls cropped out</returns>
public static Maybe<ImageWrapper> TryCropiPhoneSixImage(ImageWrapper originalImage)
{
return from croppedImage in ImageTransformations.TryCropImage(
originalImage.Image,
IPHONE_6_VIEWPORT_ORIGIN,
IPHONE_6_VIEWPORT_RECTANGLE
)
select new ImageWrapper(croppedImage, originalImage.ImagePath);
}
private static IEnumerable<string> TryProcessSnapshotFromiPhoneSix(
ImageWrapper originalSnapshot,
IEnumerable<string> candidateSnapshots
)
{
if (Predicates.IsiPhoneSixSize(originalSnapshot.Image) == false)
{
return Enumerable.Empty<string>();
}
Maybe<IEnumerable<string>> deducedSnapshots = from croppedOriginalSnapshot in ImageCropper.TryCropiPhoneSixImage(originalSnapshot)
select CommonFunctions.ExecThenDispose(
() => TryDeduceMatchingCandidateSnapshot(
croppedOriginalSnapshot,
candidateSnapshots,
TransformCandidateSnapshotForiPhoneSix
),
croppedOriginalSnapshot
);
return deducedSnapshots.OrElse(Enumerable.Empty<string>());
}
private static IEnumerable<string> TryProcessSnapshotFromiPad(
ImageWrapper originalSnapshot,
IEnumerable<string> candidateSnapshots
)
{
if (Predicates.IsiPadSize(originalSnapshot.Image) == false)
{
return Enumerable.Empty<string>();
}
var deducedSnapshots = from croppedImage in ImageCropper.TryCropiPadImage(originalSnapshot)
from resizedImage in ImageTransformations.TryResizeImage(croppedImage.Image, 1280, 720)
let transformedOriginalSnapshot = new ImageWrapper(resizedImage, originalSnapshot.ImagePath)
select CommonFunctions.ExecThenDispose(
() => TryDeduceMatchingCandidateSnapshot(transformedOriginalSnapshot, candidateSnapshots, i => i.ToMaybe()),
croppedImage,
resizedImage
);
return deducedSnapshots.OrElse(Enumerable.Empty<string>());
}