void DetectEdge()
{
if (this.pictureBox_clip.Image == null)
{
return;
}
Cursor old_cursor = this.Cursor;
this.Cursor = Cursors.WaitCursor;
try
{
double angle = 0;
Rectangle rect;
using (Bitmap bitmap = new Bitmap(this.pictureBox_clip.Image))
{
// this.pictureBox1.Image = ImageUtil.AforgeAutoCrop(bitmap);
DetectBorderParam param = new DetectBorderParam(bitmap);
bool bRet = AForgeImageUtil.GetSkewParam(bitmap,
param,
out angle,
out rect);
if (bRet == false)
{
MessageBox.Show(this, "探测边框失败");
return;
}
}
#if NO
using (Bitmap bitmap = new Bitmap(this.pictureBox1.Image))
{
this.pictureBox1.Image = ImageUtil.Apply(bitmap,
angle,
rect);
}
#endif
List <Point> points = this.pictureBox_clip.ToPoints((float)angle, rect);
this.pictureBox_clip.SetPoints(points);
}
finally
{
this.Cursor = old_cursor;
}
}
public static System.Drawing.Image AforgeAutoCrop(Bitmap selectedImage,
DetectBorderParam param)
{
// 一些参数的默认值
if (param.MinObjectWidth == 0)
param.MinObjectWidth = 500;
if (param.MinObjectHeight == 0)
param.MinObjectHeight = 500;
Bitmap autoCropImage = null;
try
{
autoCropImage = selectedImage;
// create grayscale filter (BT709)
Grayscale filter = new Grayscale(0.2125, 0.7154, 0.0721);
Bitmap grayImage = filter.Apply(autoCropImage);
// create instance of skew checker
DocumentSkewChecker skewChecker = new DocumentSkewChecker();
// get documents skew angle
double angle = skewChecker.GetSkewAngle(grayImage);
// create rotation filter
RotateBilinear rotationFilter = new RotateBilinear(-angle);
rotationFilter.FillColor = Color.White;
// rotate image applying the filter
Bitmap rotatedImage = rotationFilter.Apply(grayImage);
new ContrastStretch().ApplyInPlace(rotatedImage);
new Threshold(100).ApplyInPlace(rotatedImage);
BlobCounter bc = new BlobCounter();
bc.FilterBlobs = true;
bc.MinWidth = param.MinObjectWidth; // 500;
bc.MinHeight = param.MinObjectHeight; // 500;
bc.ProcessImage(rotatedImage);
Rectangle[] rects = bc.GetObjectsRectangles();
if (rects.Length == 0)
{
System.Windows.Forms.MessageBox.Show("No rectangle found in image ");
}
else if (rects.Length == 1)
{
autoCropImage = rotatedImage.Clone(rects[0], rotatedImage.PixelFormat);
}
else if (rects.Length > 1)
{
// get largets rect
Console.WriteLine("Using largest rectangle found in image ");
var r2 = rects.OrderByDescending(r => r.Height * r.Width).ToList();
autoCropImage = rotatedImage.Clone(r2[1], rotatedImage.PixelFormat);
}
else
{
Console.WriteLine("Huh? on image ");
}
}
catch (Exception ex)
{
// MessageBox.Show(ex.Message);
throw ex;
}
return autoCropImage;
}
public static bool GetSkewParam(Bitmap selectedImage,
DetectBorderParam param,
out double angle,
out Rectangle rect)
{
// 一些参数的默认值
if (param.MinObjectWidth == 0)
param.MinObjectWidth = 500;
if (param.MinObjectHeight == 0)
param.MinObjectHeight = 500;
Bitmap autoCropImage = null;
try
{
autoCropImage = selectedImage;
#if NO
// create grayscale filter (BT709)
Grayscale filter = new Grayscale(0.2125, 0.7154, 0.0721);
Bitmap grayImage = filter.Apply(autoCropImage);
#endif
Bitmap grayImage = selectedImage.Clone(new Rectangle(0, 0, selectedImage.Width, selectedImage.Height),
System.Drawing.Imaging.PixelFormat.Format8bppIndexed);
// create instance of skew checker
DocumentSkewChecker skewChecker = new DocumentSkewChecker();
// get documents skew angle
angle = skewChecker.GetSkewAngle(grayImage);
// create rotation filter
RotateBilinear rotationFilter = new RotateBilinear(-angle);
rotationFilter.FillColor = Color.Black; // .White;
rotationFilter.KeepSize = true;
// rotate image applying the filter
Bitmap rotatedImage = rotationFilter.Apply(grayImage);
new ContrastStretch().ApplyInPlace(rotatedImage);
new Threshold(100).ApplyInPlace(rotatedImage);
BlobCounter bc = new BlobCounter();
bc.FilterBlobs = true;
bc.MinWidth = param.MinObjectWidth; // 500;
bc.MinHeight = param.MinObjectHeight; // 500;
#if NO
bc.MinWidth = 500;// grayImage.Width / 10; // 500
bc.MinHeight = 500;// grayImage.Height / 10; // 500
#endif
bc.ProcessImage(rotatedImage);
Rectangle[] rects = bc.GetObjectsRectangles();
if (rects.Length == 0)
{
// System.Windows.Forms.MessageBox.Show("No rectangle found in image ");
rect = new Rectangle(0, 0, 0, 0);
return false;
}
else if (rects.Length == 1)
{
rect = rects[0];
// autoCropImage = rotatedImage.Clone(rects[0], rotatedImage.PixelFormat);
}
else if (rects.Length > 1)
{
// TODO： 应该把这些矩形合并在一起
Rectangle first = new Rectangle(0, 0, 0, 0);
int i = 0;
foreach (Rectangle one in rects)
{
Debug.WriteLine("one=" + one.ToString());
if (i == 0)
first = one;
else
first = Merge(first, one);
i++;
}
rect = first;
Debug.WriteLine("result=" + rect.ToString());
#if NO
// get largets rect
Console.WriteLine("Using largest rectangle found in image ");
var r2 = rects.OrderByDescending(r => r.Height * r.Width).ToList();
rect = r2[1];
// autoCropImage = rotatedImage.Clone(r2[1], rotatedImage.PixelFormat);
#endif
}
else
{
// Console.WriteLine("Huh? on image ");
rect = new Rectangle(0, 0, 0, 0);
return false;
}
#if NO
Blob[] blobs = bc.GetObjectsInformation();
foreach (var blob in blobs)
{
List<IntPoint> edgePoints = blobCounter.GetBlobsEdgePoints(blob);
List<IntPoint> cornerPoints;
// use the shape checker to extract the corner points
if (shapeChecker.IsQuadrilateral(edgePoints, out cornerPoints))
{
// only do things if the corners form a rectangle
if (shapeChecker.CheckPolygonSubType(cornerPoints) == PolygonSubType.Rectangle)
{
// here i use the graphics class to draw an overlay, but you
// could also just use the cornerPoints list to calculate your
// x, y, width, height values.
List<Point> Points = new List<Point>();
foreach (var point in cornerPoints)
{
Points.Add(new Point(point.X, point.Y));
}
Graphics g = Graphics.FromImage(image);
g.DrawPolygon(new Pen(Color.Red, 5.0f), Points.ToArray());
image.Save("result.png");
}
}
}
#endif
}
catch (Exception ex)
{
// MessageBox.Show(ex.Message);
throw ex;
}
finally
{
if (autoCropImage != null)
autoCropImage.Dispose();
}
return true;
}
public static System.Drawing.Image AforgeAutoCrop(Bitmap selectedImage,
DetectBorderParam param)
{
// 一些参数的默认值
if (param.MinObjectWidth == 0)
{
param.MinObjectWidth = 500;
}
if (param.MinObjectHeight == 0)
{
param.MinObjectHeight = 500;
}
Bitmap autoCropImage = null;
try
{
autoCropImage = selectedImage;
// create grayscale filter (BT709)
Grayscale filter = new Grayscale(0.2125, 0.7154, 0.0721);
Bitmap grayImage = filter.Apply(autoCropImage);
// create instance of skew checker
DocumentSkewChecker skewChecker = new DocumentSkewChecker();
// get documents skew angle
double angle = skewChecker.GetSkewAngle(grayImage);
// create rotation filter
RotateBilinear rotationFilter = new RotateBilinear(-angle);
rotationFilter.FillColor = Color.White;
// rotate image applying the filter
Bitmap rotatedImage = rotationFilter.Apply(grayImage);
new ContrastStretch().ApplyInPlace(rotatedImage);
new Threshold(100).ApplyInPlace(rotatedImage);
BlobCounter bc = new BlobCounter();
bc.FilterBlobs = true;
bc.MinWidth = param.MinObjectWidth; // 500;
bc.MinHeight = param.MinObjectHeight; // 500;
bc.ProcessImage(rotatedImage);
Rectangle[] rects = bc.GetObjectsRectangles();
if (rects.Length == 0)
{
System.Windows.Forms.MessageBox.Show("No rectangle found in image ");
}
else if (rects.Length == 1)
{
autoCropImage = rotatedImage.Clone(rects[0], rotatedImage.PixelFormat);
}
else if (rects.Length > 1)
{
// get largets rect
Console.WriteLine("Using largest rectangle found in image ");
var r2 = rects.OrderByDescending(r => r.Height * r.Width).ToList();
autoCropImage = rotatedImage.Clone(r2[1], rotatedImage.PixelFormat);
}
else
{
Console.WriteLine("Huh? on image ");
}
}
catch (Exception ex)
{
// MessageBox.Show(ex.Message);
throw ex;
}
return(autoCropImage);
}
public static bool GetSkewParam(Bitmap selectedImage,
DetectBorderParam param,
out double angle,
out Rectangle rect)
{
// 一些参数的默认值
if (param.MinObjectWidth == 0)
{
param.MinObjectWidth = 500;
}
if (param.MinObjectHeight == 0)
{
param.MinObjectHeight = 500;
}
Bitmap autoCropImage = null;
Bitmap grayImage = null;
Bitmap rotatedImage = null;
try
{
autoCropImage = selectedImage;
#if NO
// create grayscale filter (BT709)
Grayscale filter = new Grayscale(0.2125, 0.7154, 0.0721);
Bitmap grayImage = filter.Apply(autoCropImage);
#endif
grayImage = selectedImage.Clone(new Rectangle(0, 0, selectedImage.Width, selectedImage.Height),
System.Drawing.Imaging.PixelFormat.Format8bppIndexed);
// create instance of skew checker
DocumentSkewChecker skewChecker = new DocumentSkewChecker();
// get documents skew angle
angle = skewChecker.GetSkewAngle(grayImage);
// create rotation filter
RotateBilinear rotationFilter = new RotateBilinear(-angle);
rotationFilter.FillColor = Color.Black; // .White;
rotationFilter.KeepSize = true;
// rotate image applying the filter
rotatedImage = rotationFilter.Apply(grayImage);
new ContrastStretch().ApplyInPlace(rotatedImage);
new Threshold(100).ApplyInPlace(rotatedImage);
BlobCounter bc = new BlobCounter();
bc.FilterBlobs = true;
bc.MinWidth = param.MinObjectWidth; // 500;
bc.MinHeight = param.MinObjectHeight; // 500;
#if NO
bc.MinWidth = 500; // grayImage.Width / 10; // 500
bc.MinHeight = 500; // grayImage.Height / 10; // 500
#endif
bc.ProcessImage(rotatedImage);
Rectangle[] rects = bc.GetObjectsRectangles();
if (rects.Length == 0)
{
// System.Windows.Forms.MessageBox.Show("No rectangle found in image ");
rect = new Rectangle(0, 0, 0, 0);
return(false);
}
else if (rects.Length == 1)
{
rect = rects[0];
// autoCropImage = rotatedImage.Clone(rects[0], rotatedImage.PixelFormat);
}
else if (rects.Length > 1)
{
// TODO： 应该把这些矩形合并在一起
Rectangle first = new Rectangle(0, 0, 0, 0);
int i = 0;
foreach (Rectangle one in rects)
{
Debug.WriteLine("one=" + one.ToString());
if (i == 0)
{
first = one;
}
else
{
first = Merge(first, one);
}
i++;
}
rect = first;
Debug.WriteLine("result=" + rect.ToString());
#if NO
// get largets rect
Console.WriteLine("Using largest rectangle found in image ");
var r2 = rects.OrderByDescending(r => r.Height * r.Width).ToList();
rect = r2[1];
// autoCropImage = rotatedImage.Clone(r2[1], rotatedImage.PixelFormat);
#endif
}
else
{
// Console.WriteLine("Huh? on image ");
rect = new Rectangle(0, 0, 0, 0);
return(false);
}
#if NO
Blob[] blobs = bc.GetObjectsInformation();
foreach (var blob in blobs)
{
List <IntPoint> edgePoints = blobCounter.GetBlobsEdgePoints(blob);
List <IntPoint> cornerPoints;
// use the shape checker to extract the corner points
if (shapeChecker.IsQuadrilateral(edgePoints, out cornerPoints))
{
// only do things if the corners form a rectangle
if (shapeChecker.CheckPolygonSubType(cornerPoints) == PolygonSubType.Rectangle)
{
// here i use the graphics class to draw an overlay, but you
// could also just use the cornerPoints list to calculate your
// x, y, width, height values.
List <Point> Points = new List <Point>();
foreach (var point in cornerPoints)
{
Points.Add(new Point(point.X, point.Y));
}
Graphics g = Graphics.FromImage(image);
g.DrawPolygon(new Pen(Color.Red, 5.0f), Points.ToArray());
image.Save("result.png");
}
}
}
#endif
}
catch (Exception ex)
{
// MessageBox.Show(ex.Message);
throw ex;
}
finally
{
if (autoCropImage != null)
{
autoCropImage.Dispose();
}
// 2018/10/23
if (rotatedImage != null)
{
rotatedImage.Dispose();
}
// 2018/10/23
if (grayImage != null)
{
grayImage.Dispose();
}
}
return(true);
}
void DetectEdge()
{
if (this.pictureBox_clip.Image == null)
return;
double angle = 0;
Rectangle rect;
using (Bitmap bitmap = new Bitmap(this.pictureBox_clip.Image))
{
// this.pictureBox1.Image = ImageUtil.AforgeAutoCrop(bitmap);
DetectBorderParam param = new DetectBorderParam(bitmap);
bool bRet = AForgeImageUtil.GetSkewParam(bitmap,
param,
out angle,
out rect);
if (bRet == false)
{
MessageBox.Show(this, "fail");
return;
}
}
#if NO
using (Bitmap bitmap = new Bitmap(this.pictureBox1.Image))
{
this.pictureBox1.Image = ImageUtil.Apply(bitmap,
angle,
rect);
}
#endif
List<Point> points = this.pictureBox_clip.ToPoints((float)angle, rect);
this.pictureBox_clip.SetPoints(points);
}
