// Standard
public CWatchImage(string name, int index, IMagickImage magickImage, double metricUpperBound)
{
Name = name;
Index = index;
MagickImage = magickImage;
HasAlpha = MagickImage != null && MagickImage.HasAlpha;
TransparencyRate = MagickImage != null?MagickImage.GetTransparencyRate() : 0;
AlphaChannel = null;
MetricUpperBound = metricUpperBound;
_PauseTicks = DateTime.MinValue.Ticks;
if (HasAlpha)
{
// Does Separate() clone the channels? If so, does it dispose of them during this?
var tmpMi = MagickImage.Separate().Last().Clone();
tmpMi.Negate();
AlphaChannel = new MagickImage(_AlphaReplacement, MagickImage.Width, MagickImage.Height);
AlphaChannel.Composite(tmpMi, CompositeOperator.CopyAlpha);
AlphaChannel.RePage();
tmpMi.Dispose();
MagickImage.ColorAlpha(_AlphaReplacement);
MagickImage.RePage();
}
}
private void Distort(IMagickImage output, PointD[] corners, MagickGeometry inputDimensions, MagickGeometry trimmedDimensions, MagickColor backgroundColor)
{
MagickGeometry outputDimensions = GetDimensions(output, corners, inputDimensions, trimmedDimensions);
double[] arguments = new double[16]
{
corners[0].X, corners[0].Y, 0, 0,
corners[1].X, corners[1].Y, 0, outputDimensions.Height,
corners[2].X, corners[2].Y, outputDimensions.Width, outputDimensions.Height,
corners[3].X, corners[3].Y, outputDimensions.Width, 0
};
output.VirtualPixelMethod = VirtualPixelMethod.Background;
output.BackgroundColor = backgroundColor;
if (!DisableViewportCrop)
{
output.SetArtifact("distort:viewport", GetViewport(arguments, corners).ToString());
}
var distortSettings = new DistortSettings()
{
Bestfit = true
};
output.Distort(DistortMethod.Perspective, distortSettings, arguments);
output.BorderColor = backgroundColor;
output.Border(2);
output.ColorFuzz = ColorFuzz;
output.Trim();
output.RePage();
}
private void TrimImage(IMagickImage result)
{
if (!Trim)
{
return;
}
result.Trim();
result.RePage();
}
private MagickGeometry TrimImage(IMagickImage image, MagickColor backgroundColor, int borderSize)
{
image.BorderColor = backgroundColor;
image.Border(borderSize);
image.ColorFuzz = ColorFuzz;
image.Trim();
image.RePage();
return(new MagickGeometry(image.Width, image.Height));
}
private void ExecuteOuterTrim(IMagickImage image, MagickColor borderColor)
{
image.BackgroundColor = borderColor;
image.ColorFuzz = ColorFuzz;
image.Trim();
image.RePage();
var geometry = new MagickGeometry(0, 0, image.Width, image.Height);
ShiftGeometry(geometry);
Crop(image, geometry);
}
public IMagickImage Execute(IMagickImage image, ValueItemCollection values)
{
Variables = values;
if (!CropVisible)
{
return(image);
}
var dw = image.Width / 1000.0;
var dh = image.Height / 1000.0;
image.Crop((int)(CropX * dw), (int)(CropY * dh), (int)(CropWidth * dw),
(int)(CropHeight * dh));
image.RePage();
return(image);
}
private void Crop(IMagickImage image, MagickGeometry area)
{
ShiftGeometry(area);
image.Crop(area.X, area.Y, area.Width, area.Height);
image.RePage();
}
// TODO: Name of this method + signature is a mess
private SearchResult FindTemplateInImage(IMagickImage needleImage, Gravity needleGravity, IMagickImage haystack, StitchTask task, Point anchor)
{
// Resize needle
var pixelMagnification = 8.0;
var magnification = Math.Min(1 / (double)pixelMagnification, 1.0);
var progress = (IProgress <double>)task;
var resizeAmount = new Percentage(magnification * 100);
var template = needleImage.Clone();
template.Resize(resizeAmount);
template.RePage();
IMagickImage searchArea = null;
var resized = false;
while (!resized)
{
try
{
lock (haystack)
{
searchArea = haystack.Clone();
searchArea.Resize(resizeAmount);
searchArea.RePage();
}
resized = true;
} catch (AccessViolationException)
{
Console.WriteLine("Corrupt Memory, trying again");
Thread.Sleep(500);
}
}
// We need to get the actual values here, since Resize() has unexpected rounding logic
// (only supports whole digit percentages) and if we don't use the actual values then
// scaling math won't work properly.
var oldWidth = searchArea.Width;
var oldHeight = searchArea.Height;
var bounds = new MagickGeometry(0, 0, searchArea.Width, searchArea.Height);
var candidates = FindTemplateCandidates(searchArea, template, bounds, progress, 2000, new HashSet <Point>());
if (candidates.Any())
{
var bestScore = candidates.First().Key;
this.initialCandidates = candidates.Where(x => x.Key < bestScore * 1.05).Select(x => {
return(new Point(x.Value.X / magnification, x.Value.Y / magnification));
}).ToList();
}
while (pixelMagnification > 1 && candidates.Any())
{
var newCandidates = new SortedList <double, Point>(new DuplicateKeyComparer <double>());
var newPixelMagnification = pixelMagnification / 2;
var newMagnification = Math.Min(1 / (double)newPixelMagnification, 1.0);
var newResizeAmount = new Percentage(newMagnification * 100);
var threshold = 2000.0;
var bestSeen = threshold;
var bestScore = candidates.First().Key;
var toLoop = candidates.Where(x => x.Key < bestScore * 1.05);
Console.WriteLine("Considering {0} candidates at {1}", toLoop.Count(), newMagnification);
IMagickImage newHaystack = null;
lock (haystack)
{
newHaystack = haystack.Clone();
newHaystack.Resize(newResizeAmount);
newHaystack.RePage();
}
var t2 = needleImage.Clone();
t2.Resize(newResizeAmount);
t2.RePage();
var cache = new HashSet <Point>();
foreach (var candidate in toLoop)
{
var point = new Point(candidate.Value.X / oldWidth * newHaystack.Width, candidate.Value.Y / oldHeight * newHaystack.Height);
var margin = newPixelMagnification;
var clampedBounds = new MagickGeometry(
(int)(point.X - margin),
(int)(point.Y - margin),
(int)(NeedleSize * newMagnification + margin * 2),
(int)(NeedleSize * newMagnification + margin * 2)
);
clampedBounds.X = Math.Max(0, clampedBounds.X);
clampedBounds.Y = Math.Max(0, clampedBounds.Y);
clampedBounds.Width = Math.Min(newHaystack.Width - clampedBounds.X, clampedBounds.Width);
clampedBounds.Height = Math.Min(newHaystack.Height - clampedBounds.Y, clampedBounds.Height);
var toAdd = FindTemplateCandidates(newHaystack, t2, clampedBounds, this, threshold, cache);
foreach (var add in toAdd)
{
newCandidates.Add(add.Key, add.Value);
if (add.Key < bestSeen)
{
bestSeen = add.Key;
Console.WriteLine("Updating best score: {0}", bestSeen);
}
}
}
candidates = newCandidates;
magnification = newMagnification;
pixelMagnification = newPixelMagnification;
oldWidth = newHaystack.Width;
oldHeight = newHaystack.Height;
}
Console.WriteLine("============ Final: {0}", candidates.Count);
if (candidates.Any())
{
var bestCandidate = candidates.First();
return(new SearchResult()
{
Distance = bestCandidate.Key,
HaystackPoint = bestCandidate.Value,
NeedlePoint = anchor
});
}
return(SearchResult.Null);
}
public static void Run([BlobTrigger("inbox/{inputFilename}", Connection = "StorageAccountConnString")] Stream inputStream, string inputFilename,
[Blob("outbox/out-{inputFilename}", FileAccess.Write, Connection = "StorageAccountConnString")] Stream outputStream, ILogger log)
{
log.LogInformation($"STEP: trigger fired for file:{inputFilename}, Size: {inputStream.Length} Bytes");
using (MagickImage image = new MagickImage(inputStream))
{
log.LogInformation($"STEP: Read image {inputFilename} with {image.BaseWidth} x {image.BaseHeight} in {image.Format.ToString()}");
// Step 0 - does nothing in the sample images I used
image.AutoOrient();
// Step 1 - Deskew
image.BackgroundColor = MagickColor.FromRgb(0, 0, 0);
image.Deskew(new Percentage(1)); // documentation suggests "A threshold of 40% works for most images" but 1% seems to work well
IMagickImage rotatedImage = image.Clone();
log.LogInformation($"STEP: Deskewed {inputFilename}");
// Step 2 - Apply threshold to transform in black and white image
image.AutoThreshold(AutoThresholdMethod.OTSU);
log.LogInformation($"STEP: Applied OTSU to {inputFilename}");
// Step 3 - find the regions (blocs) in the image and group them if large enough
IEnumerable <ConnectedComponent> components = null;
ConnectedComponentsSettings ccs = new ConnectedComponentsSettings();
ccs.AreaThreshold = 500 * 500.0; // 500x500 -- seems to be pointless, many more regions are returned
ccs.Connectivity = 8;
components = image.ConnectedComponents(ccs);
// if there are multiple blocs, consolidate them in a larger block
if (components != null && components.Count() > 0)
{
log.LogInformation($"STEP: Looked for regions in {inputFilename}, there are {components.Count()}");
// filter out the smaller rectangles, as the AreaThreshold parameter seems not to be working
List <ConnectedComponent> biggerComponents = components.Where(cc => cc.Height * cc.Width >= 250000 && cc.Height * cc.Width != image.Width * image.Height) /*.OrderByDescending(i => i.Height * i.Width)*/.ToList();
int topLeftX = biggerComponents[0].X, topLeftY = biggerComponents[0].Y, bottomRightX = biggerComponents[0].Width + topLeftX, bottomRightY = biggerComponents[0].Height + topLeftY;
foreach (ConnectedComponent cc in biggerComponents)
{
#region Debug -- draw the regions on the image
//DrawableStrokeColor strokeColor = new DrawableStrokeColor(new MagickColor("yellow"));
//DrawableStrokeWidth stokeWidth = new DrawableStrokeWidth(3);
//DrawableFillColor fillColor = new DrawableFillColor(new MagickColor(50, 50, 50, 128));
//DrawableRectangle dr = new DrawableRectangle(cc.X, cc.Y, cc.X + cc.Width, cc.Y + cc.Height);
//rotatedImage.Draw(dr, strokeColor, stokeWidth, fillColor);
#endregion
if (cc.X < topLeftX)
{
topLeftX = cc.X;
}
if (cc.Y < topLeftY)
{
topLeftY = cc.Y;
}
if (cc.X + cc.Width > bottomRightX)
{
bottomRightX = cc.X + cc.Width;
}
if (cc.Y + cc.Height > bottomRightY)
{
bottomRightY = cc.Y + cc.Height;
}
}
#region Debug -- draw the bounding box on the image
//DrawableStrokeColor strokeColor2 = new DrawableStrokeColor(new MagickColor("purple"));
//DrawableStrokeWidth stokeWidth2 = new DrawableStrokeWidth(3);
//DrawableFillColor fillColor2 = new DrawableFillColor(new MagickColor(50, 50, 50, 128));
//DrawableRectangle dr2 = new DrawableRectangle(topLeftX, topLeftY, bottomRightX, bottomRightY);
//rotatedImage.Draw(dr2, strokeColor2, stokeWidth2, fillColor2);
#endregion
// Step 4 - Crop the image
MagickGeometry mg = new MagickGeometry(topLeftX, topLeftY, bottomRightX - topLeftX, bottomRightY - topLeftY);
rotatedImage.RePage(); // this is needed because otherwise the crop is relative to the page information and sometimes this leads to an incorrect crop
rotatedImage.Crop(mg);
log.LogInformation($"STEP: Cropped {inputFilename} to fit existing large regions");
}
else
{
log.LogInformation($"STEP: Looked for large regions in {inputFilename}, none were found, skipping crop");
}
// Step 5 - Resize the image to 1200px width (todo: move to configuration)
int originalWidth = rotatedImage.BaseWidth;
int originalHeight = rotatedImage.BaseHeight;
rotatedImage.Resize(1200, 0); // make width 1200, height proportional
log.LogInformation($"STEP: Resized {inputFilename} from {originalWidth}x{originalHeight} to {image.BaseWidth}x{image.BaseHeight}");
// Step 6 - write out as Jpeg with 70% quality
rotatedImage.Format = MagickFormat.Jpeg;
rotatedImage.Quality = 70;
rotatedImage.Write(outputStream);
log.LogInformation($"STEP: Wrote out {inputFilename} as JPEG");
}
log.LogInformation($"STEP: Processing of {inputFilename} done");
}
