public unsafe int StretchContrast(int stretchVal)
{
BitmapData sourceData = sourceImage.LockBits(new Rectangle(0, 0, sourceImage.Width, sourceImage.Height), ImageLockMode.ReadWrite, PixelFormat.Format32bppArgb);
BitmapData processData = processImage.LockBits(new Rectangle(0, 0, processImage.Width, processImage.Height), ImageLockMode.ReadWrite, PixelFormat.Format32bppArgb);
// set pointers
uint* sourceP = (uint*)sourceData.Scan0;
uint* processP = (uint*)processData.Scan0;
GetImageContrast contrast = new GetImageContrast();
int[] contr = contrast.Process(sourceP, processP, sourceImage.Size);
label6.Text = "DiffContrast: " + Convert.ToString(contr[0]);
label5.Text = "MaxDiffContrast: " + Convert.ToString(contr[1]);
// filter the image
ContrastStretchingFilter stretch = new ContrastStretchingFilter();
stretch.difference = contr[0];
stretch.Process(sourceP, processP, size, stretchVal);
sourceImage.UnlockBits(sourceData);
processImage.UnlockBits(processData);
originalImage = new Bitmap(processImage);
return Convert.ToInt32(stretch.greyOverall);
}
/// <summary>
/// Detects the labels in the Bitmap
/// </summary>
/// <param name="source">Source Bitmap where the labels should be found</param>
/// <returns>List of found labels</returns>
public unsafe List<Rectangle> GetLabels(Bitmap source)
{
List<Rectangle> results = new List<Rectangle>();
Size size = new Size(source.Width, source.Height); // size of the image
sourceImage = new Bitmap(source); // normal image
processImage = new Bitmap(source); // image for detection
BitmapData sourceData = sourceImage.LockBits(new Rectangle(0, 0, sourceImage.Width, sourceImage.Height), ImageLockMode.ReadWrite, PixelFormat.Format32bppArgb);
BitmapData processData = processImage.LockBits(new Rectangle(0, 0, processImage.Width, processImage.Height), ImageLockMode.ReadWrite, PixelFormat.Format32bppArgb);
// set pointers
uint* sourceP = (uint*)sourceData.Scan0;
uint* processP = (uint*)processData.Scan0;
// filter the image
ContrastStretchingFilter stretch = new ContrastStretchingFilter();
stretch.Process(sourceP, processP, size);
processImage.Save(@"C:\Temp\labels_stretch.png");
CopyImage(processP, sourceP, size);
SobelFilter sobel = new SobelFilter();
sobel.SobelValue = sobelValue;
sobel.Process(sourceP, processP, size);
PixelExtractionFilter pixelExtraction = new PixelExtractionFilter();
pixelExtraction.Process(sourceP, processP, size);
// save image for debugging
processImage.Save(@"C:\Temp\labels_0.png");
DrawBlackBorder(processP, size);
// override source bitmap with filtered bitmap
CopyImage(processP, sourceP, size);
// detect the labels
LabelDetection detection = new LabelDetection();
detection.Ratio = legalRatio;
results = detection.Process(sourceP, processP, size);
sourceImage.UnlockBits(sourceData);
processImage.UnlockBits(processData);
// save image for debugging
sourceImage.Save(@"C:\Temp\labels_1.png");
return results;
}