public static WriteableBitmap GetMiddleGaussianImage(WriteableBitmap writeableBitmap)
{
Stopwatch stopwatch = new Stopwatch();
stopwatch.Start();
var height = writeableBitmap.PixelHeight;
var width = writeableBitmap.PixelWidth;
var cropedWriteableBitmap = writeableBitmap.Crop(new Rect(new Point(0, height / 3), new Point(width, height / 3 * 2)));
WriteableBitmap resizedWriteableBitmap = cropedWriteableBitmap.Resize(width / 8, height / 8, WriteableBitmapExtensions.Interpolation.Bilinear);
WriteableBitmap gaussianBackground = resizedWriteableBitmap.Convolute(WriteableBitmapExtensions.KernelGaussianBlur5x5);
stopwatch.Stop();
Debug.WriteLine("GetMiddleGaussianImage time:" + stopwatch.ElapsedMilliseconds.ToString());
return gaussianBackground;
}
private WriteableBitmap FindPlate(IEnumerable<Rect> rects, WriteableBitmap image)
{
WriteableBitmap bestCandidate = null;
foreach (var rect in rects)
{
var croppedImage = image.Crop(rect);
var edgeFilter = new CannyEdgeDetector();
var smoothFilter = new Median();
var grayFilter = new Grayscale(0.2125, 0.7154, 0.0721);
var blobCounter = new BlobCounter();
var cutTop = croppedImage.PixelHeight * 0.3;
croppedImage = croppedImage.Crop(new Rect(0, cutTop, croppedImage.PixelWidth, croppedImage.PixelHeight));
var bitmap = (Bitmap)croppedImage;
var grayImage = grayFilter.Apply(bitmap);
bitmap = smoothFilter.Apply(grayImage);
edgeFilter.ApplyInPlace(bitmap);
blobCounter.ProcessImage(bitmap);
var blobs = blobCounter.GetObjectsInformation();
var possibleChars = new List<Rectangle>();
foreach (var blob in blobs)
{
var objRectangle = blob.Rectangle;
var ratio = (double)objRectangle.Height / (double)objRectangle.Width;
if (ratio >= 1.16d && ratio <= 6.3d)
{
possibleChars.Add(objRectangle);
}
}
if (possibleChars.Count == 0)
{
continue;
}
bestCandidate = croppedImage;
}
return bestCandidate;
}
private async void CropImage(bool wide = false)
{
IsCropEnabled = false;
try
{
var img = wide ? _previewImageWide : _previewImageNormal;
WriteableBitmap resizedBitmap = new WriteableBitmap(CropWidth, CropHeight);
//if (img.UriSource == null)
//await resizedBitmap.LoadAsync(_originaPickedStorageFile);
/*else*/
if (!img.UriSource.ToString().Contains("ms-appdata"))
{
var imgFile = await SaveImage(img, wide);
await resizedBitmap.LoadAsync(imgFile);
}
else
await resizedBitmap.LoadAsync(await StorageFile.GetFileFromApplicationUriAsync(img.UriSource));
if (wide)
resizedBitmap = resizedBitmap.Crop(CropLeftWide, CropTopWide, CropWidthWide + CropLeftWide, CropTopWide + CropHeightWide);
else
resizedBitmap = resizedBitmap.Crop(CropLeft, CropTop, CropWidth + CropLeft, CropTop + CropHeight);
var file = await ApplicationData.Current.TemporaryFolder.CreateFileAsync($"_cropTemp{(wide ? "Wide" : "")}.png", CreationCollisionOption.GenerateUniqueName);
if (wide)
_lastCroppedFileNameWide = file.Name;
else
_lastCroppedFileName = file.Name;
await resizedBitmap.SaveAsync(file, BitmapEncoder.PngEncoderId);
if (wide)
{
PreviewImageWide = new BitmapImage(new Uri($"ms-appdata:///temp/{file.Name}"));
}
else
{
PreviewImageNormal = new BitmapImage(new Uri($"ms-appdata:///temp/{file.Name}"));
UndoCropVisibility = Visibility.Visible;
}
}
catch (Exception)
{
UWPUtilities.GiveStatusBarFeedback("An error occured...");
}
IsCropEnabled = true;
}
private WriteableBitmap CropIfNeeded(WriteableBitmap writeableBitmap)
{
var height = writeableBitmap.PixelHeight;
var width = writeableBitmap.PixelWidth;
var xCenter = width/2;
var yCenter = height/2;
if (width > height)
{
return writeableBitmap.Crop(xCenter - height/2, 0, height, height);
}
if (width < height)
{
return writeableBitmap.Crop(0, yCenter - width/2, width, width);
}
return writeableBitmap;
}
/// <summary>
/// Gets the current preview frame as a SoftwareBitmap, displays its properties in a TextBlock, and can optionally display the image
/// in the UI and/or save it to disk as a jpg
/// </summary>
/// <returns>Task representing the async event status</returns>
private async Task GetPreviewFrameAsSoftwareBitmapAsync()
{
// Get information about the preview
VideoEncodingProperties previewProperties = this._mediaCapture.VideoDeviceController.GetMediaStreamProperties(MediaStreamType.VideoPreview) as VideoEncodingProperties;
// Create the video frame to request a SoftwareBitmap preview frame
VideoFrame videoFrame = new VideoFrame(BitmapPixelFormat.Bgra8, (int)previewProperties.Width, (int)previewProperties.Height);
// Capture the preview frame
using (VideoFrame currentFrame = await this._mediaCapture.GetPreviewFrameAsync(videoFrame))
{
// Collect the resulting frame
SoftwareBitmap previewFrame = currentFrame.SoftwareBitmap;
// Show the frame information
Debug.WriteLine("{0}x{1} {2}", previewFrame.PixelWidth, previewFrame.PixelHeight, previewFrame.BitmapPixelFormat);
tempWriteableBitmap = new WriteableBitmap(previewFrame.PixelWidth, previewFrame.PixelHeight);
previewFrame.CopyToBuffer(tempWriteableBitmap.PixelBuffer);
// Crop to a square, based on the smallest side
int minEdge = Math.Min(tempWriteableBitmap.PixelWidth, tempWriteableBitmap.PixelHeight);
tempWriteableBitmap = tempWriteableBitmap
.Crop(0, 0, minEdge, minEdge)
.Resize(App.LedMatrix.PixelWidth, App.LedMatrix.PixelHeight, WriteableBitmapExtensions.Interpolation.Bilinear);
WriteableBitmap previewFrameImageSource =
tempWriteableBitmap.Rotate(90).Resize(
(int)this.postViewbox.Height,
(int)this.postViewbox.Width,
WriteableBitmapExtensions.Interpolation.NearestNeighbor);
this.previewFrameImage.Source = previewFrameImageSource;
}
}