public static Bitmap Binarize(Bitmap bm, double threshhold)
{
//Binarize
int size = bm.Width * bm.Height;
int[] pixels = new int[size];
bm.GetPixels( pixels, 0, bm.Width, 0, 0, bm.Width, bm.Height );
// Calculate overall lightness of image
int c;
for (int i = 0; i < size; i++)
{
c = pixels[i];
double whiteDist = Math.Sqrt(Math.Pow(0xff - ((c&0x00FF0000 )>>16),2) + Math.Pow(0xff - ((c & 0x0000FF00 )>>8), 2) + Math.Pow(0xff - (c&0x000000FF), 2));
double blackDist = Math.Sqrt(Math.Pow(0x00 - ((c&0x00FF0000 )>>16),2) + Math.Pow(0x00 - ((c & 0x0000FF00 )>>8), 2) + Math.Pow(0x00 - (c&0x000000FF), 2));
double distance = blackDist + whiteDist;
if (whiteDist / distance > threshhold / 30.0) {
pixels [i] = Color.Black;
} else {
pixels [i] = Color.White;
}
}
Bitmap newBitmap = bm.Copy (bm.GetConfig (), true);
newBitmap.SetPixels (pixels, 0, bm.Width, 0, 0, bm.Width, bm.Height);
return newBitmap;
}
//Create the remove red button
private void NoRed(object sender, System.EventArgs e)
{
TextView tv_saved = FindViewById <TextView>(Resource.Id.respondText);
ImageView imageView = FindViewById <ImageView>(Resource.Id.takenPictureImageView);
int height = Resources.DisplayMetrics.HeightPixels;
int width = imageView.Height;
Android.Graphics.Bitmap bitmap = _file.Path.LoadAndResizeBitmap(width, height);
Android.Graphics.Bitmap copyBitmap = bitmap.Copy(Android.Graphics.Bitmap.Config.Argb8888, true);
for (int i = 0; i < copyBitmap.Width; i++)
{
for (int j = 0; j < copyBitmap.Height; j++)
{
int p = copyBitmap.GetPixel(i, j);
//00000000 00000000 00000000 00000000
//long mask = (long)0xFF00FFFF;
//p = p & (int)mask;
Android.Graphics.Color c = new Android.Graphics.Color(p);
c.R = 0;
copyBitmap.SetPixel(i, j, c);
}
}
if (bitmap != null)
{
imageView.SetImageBitmap(copyBitmap);
imageView.Visibility = Android.Views.ViewStates.Visible;
}
System.GC.Collect();
tv_saved.SetTextKeepState("Red Removed!");
}
public static Android.Graphics.Bitmap mergeBitmap(Android.Graphics.Bitmap backBitmap, Android.Graphics.Bitmap frontBitmap)
{
Android.Graphics.Bitmap bitmap = backBitmap.Copy(Android.Graphics.Bitmap.Config.Argb8888, true);
Canvas canvas = new Canvas(bitmap);
Rect baseRect = new Rect(0, 0, backBitmap.Width, backBitmap.Height);
Rect frontRect = new Rect(0, 0, frontBitmap.Width, frontBitmap.Height);
canvas.DrawBitmap(frontBitmap, frontRect, baseRect, null);
return(bitmap);
}
// Called automatically whenever an activity finishes
protected override void OnActivityResult(int requestCode, Result resultCode, Intent data)
{
base.OnActivityResult(requestCode, resultCode, data);
SetContentView(Resource.Layout.PicManip);
bool reverted = true;
Button remred = FindViewById <Button>(Resource.Id.RemRed);
Button remgreen = FindViewById <Button>(Resource.Id.RemGreen);
Button remblue = FindViewById <Button>(Resource.Id.RemBlue);
Button negred = FindViewById <Button>(Resource.Id.NegRed);
Button neggreen = FindViewById <Button>(Resource.Id.NegGreen);
Button negblue = FindViewById <Button>(Resource.Id.NegBlue);
Button greyscale = FindViewById <Button>(Resource.Id.Greyscale);
Button high_cont = FindViewById <Button>(Resource.Id.HighContrast);
Button add_noise = FindViewById <Button>(Resource.Id.AddNoise);
Button revert = FindViewById <Button>(Resource.Id.Revert);
Button save = FindViewById <Button>(Resource.Id.Save);
//test to make sure the picture was found
if ((resultCode == Result.Ok) && (data != null))
{
//Make image available in the gallery
//Test to see if we came from the camera or gallery
//If we came from galley no need to make pic available
if (requestCode == 0)
{
Intent mediaScanIntent = new Intent(Intent.ActionMediaScannerScanFile);
var contentUri = Android.Net.Uri.FromFile(_file);
mediaScanIntent.SetData(contentUri);
SendBroadcast(mediaScanIntent);
}
}
// Display in ImageView. We will resize the bitmap to fit the display.
// Loading the full sized image will consume too much memory
// and cause the application to crash.
ImageView imageView = FindViewById <ImageView>(Resource.Id.takenPictureImageView);
int height = Resources.DisplayMetrics.HeightPixels;
int width = imageView.Height;
bitmap = (Android.Graphics.Bitmap)data.Extras.Get("data");
bitmap = Android.Graphics.Bitmap.CreateScaledBitmap(bitmap, 1024, 768, true);
//check to make sure the bitmap has data we can manipulate
if (bitmap != null)
{
copyBitmap = bitmap.Copy(Android.Graphics.Bitmap.Config.Argb8888, true);
imageView.SetImageBitmap(copyBitmap);
}
else
{
//If bitmap is null takes the user back to the original screen
StartMainLayout();
}
//Removes the red in the picture by setting the red pixel to 0
remred.Click += delegate
{
for (int i = 0; i < copyBitmap.Width; i++)
{
for (int j = 0; j < copyBitmap.Height; j++)
{
int p = copyBitmap.GetPixel(i, j);
Android.Graphics.Color c = new Android.Graphics.Color(p);
c.R = 0;
copyBitmap.SetPixel(i, j, c);
}
}
imageView.SetImageBitmap(copyBitmap);
reverted = false;
};
//Removes the green in the picture by setting the green pixel to 0
remgreen.Click += delegate
{
for (int i = 0; i < copyBitmap.Width; i++)
{
for (int j = 0; j < copyBitmap.Height; j++)
{
int p = copyBitmap.GetPixel(i, j);
Android.Graphics.Color c = new Android.Graphics.Color(p);
c.G = 0;
copyBitmap.SetPixel(i, j, c);
}
}
imageView.SetImageBitmap(copyBitmap);
reverted = false;
};
//Removes the blue in the picture by setting the blue pixel to 0
remblue.Click += delegate
{
for (int i = 0; i < copyBitmap.Width; i++)
{
for (int j = 0; j < copyBitmap.Height; j++)
{
int p = copyBitmap.GetPixel(i, j);
Android.Graphics.Color c = new Android.Graphics.Color(p);
c.B = 0;
copyBitmap.SetPixel(i, j, c);
}
}
imageView.SetImageBitmap(copyBitmap);
reverted = false;
};
//Negates the red in the picture by subtracting 255 from the current red pixels value
negred.Click += delegate
{
for (int i = 0; i < copyBitmap.Width; i++)
{
for (int j = 0; j < copyBitmap.Height; j++)
{
int p = copyBitmap.GetPixel(i, j);
Android.Graphics.Color c = new Android.Graphics.Color(p);
int r1 = c.R;
r1 = 255 - r1;
c.R = Convert.ToByte(r1);
copyBitmap.SetPixel(i, j, c);
}
}
imageView.SetImageBitmap(copyBitmap);
reverted = false;
};
//Negates the green in the picture by subtracting 255 from the current green pixels value
neggreen.Click += delegate
{
for (int i = 0; i < copyBitmap.Width; i++)
{
for (int j = 0; j < copyBitmap.Height; j++)
{
int p = copyBitmap.GetPixel(i, j);
Android.Graphics.Color c = new Android.Graphics.Color(p);
int g1 = c.G;
g1 = 255 - g1;
c.G = Convert.ToByte(g1);
copyBitmap.SetPixel(i, j, c);
}
}
imageView.SetImageBitmap(copyBitmap);
reverted = false;
};
//Negates the blue in the picture by subtracting 255 from the current blue pixels value
negblue.Click += delegate
{
for (int i = 0; i < copyBitmap.Width; i++)
{
for (int j = 0; j < copyBitmap.Height; j++)
{
int p = copyBitmap.GetPixel(i, j);
Android.Graphics.Color c = new Android.Graphics.Color(p);
int b1 = c.B;
b1 = 255 - b1;
c.B = Convert.ToByte(b1);
copyBitmap.SetPixel(i, j, c);
}
}
imageView.SetImageBitmap(copyBitmap);
reverted = false;
};
//Converts the picture to greyscale by averaging all the pixels values
//Then setting the each pixel to the average
greyscale.Click += delegate
{
for (int i = 0; i < copyBitmap.Width; i++)
{
for (int j = 0; j < copyBitmap.Height; j++)
{
int average = 0;
int p = copyBitmap.GetPixel(i, j);
Android.Graphics.Color c = new Android.Graphics.Color(p);
int r_temp = c.R;
int g_temp = c.G;
int b_temp = c.B;
average = (r_temp + g_temp + b_temp) / 3;
c.R = Convert.ToByte(average);
c.G = Convert.ToByte(average);
c.B = Convert.ToByte(average);
copyBitmap.SetPixel(i, j, c);
}
}
imageView.SetImageBitmap(copyBitmap);
reverted = false;
};
//Converts the picture to high contrast
//If the pixel > 127.5, then set to 255, else set to 0
high_cont.Click += delegate
{
for (int i = 0; i < copyBitmap.Width; i++)
{
for (int j = 0; j < copyBitmap.Height; j++)
{
int check_num = 255 / 2;
int p = copyBitmap.GetPixel(i, j);
Android.Graphics.Color c = new Android.Graphics.Color(p);
int r_temp = c.R;
int g_temp = c.G;
int b_temp = c.B;
if (r_temp > check_num)
{
r_temp = 255;
}
else
{
r_temp = 0;
}
if (g_temp > check_num)
{
g_temp = 255;
}
else
{
g_temp = 0;
}
if (b_temp > check_num)
{
b_temp = 255;
}
else
{
b_temp = 0;
}
c.R = Convert.ToByte(r_temp);
c.G = Convert.ToByte(g_temp);
c.B = Convert.ToByte(b_temp);
copyBitmap.SetPixel(i, j, c);
}
}
imageView.SetImageBitmap(copyBitmap);
reverted = false;
};
//Adds random noise to the picture
//Get a random value from -10 - 10, and add it to the pixels value
//making sure the pixel value doesn't go over 255 or under 0.
add_noise.Click += delegate
{
Random rnd = new Random();
for (int i = 0; i < copyBitmap.Width; i++)
{
for (int j = 0; j < copyBitmap.Height; j++)
{
int p = copyBitmap.GetPixel(i, j);
Android.Graphics.Color c = new Android.Graphics.Color(p);
int rand_val = rnd.Next(-10, 11);
int r_temp = c.R;
int g_temp = c.G;
int b_temp = c.B;
r_temp += rand_val;
g_temp += rand_val;
b_temp += rand_val;
if (r_temp > 255)
{
r_temp = 255;
}
else if (r_temp < 0)
{
r_temp = 0;
}
if (g_temp > 255)
{
g_temp = 255;
}
else if (g_temp < 0)
{
g_temp = 0;
}
if (b_temp > 255)
{
b_temp = 255;
}
else if (b_temp < 0)
{
b_temp = 0;
}
c.R = Convert.ToByte(r_temp);
c.G = Convert.ToByte(g_temp);
c.B = Convert.ToByte(b_temp);
copyBitmap.SetPixel(i, j, c);
}
}
imageView.SetImageBitmap(copyBitmap);
reverted = false;
};
//Button used to revert the image effects back to the orginal picture
revert.Click += delegate
{
if (bitmap != null && !reverted)
{
copyBitmap = bitmap.Copy(Android.Graphics.Bitmap.Config.Argb8888, true);
imageView.SetImageBitmap(copyBitmap);
reverted = true;
}
else if (reverted)
{
Toast.MakeText(this, "The picture is the original.", ToastLength.Short).Show();
}
};
//Saves the image to the users gallery
save.Click += delegate
{
var sdCardPath = Android.OS.Environment.ExternalStorageDirectory.AbsolutePath;
var filePath = System.IO.Path.Combine(sdCardPath, "ImageManip_{0}.png");
var stream = new FileStream(filePath, FileMode.Create);
copyBitmap.Compress(Bitmap.CompressFormat.Png, 100, stream);
stream.Close();
Toast.MakeText(this, "The picture was saved to gallery.", ToastLength.Short).Show();
StartMainLayout();
};
// Dispose of the Java side bitmap.
System.GC.Collect();
}
// Source: http://incubator.quasimondo.com/processing/superfast_blur.php
public static Bitmap ToLegacyBlurred(Bitmap source, Context context, int radius)
{
Bitmap img = source.Copy(source.GetConfig(), true);
int w = img.Width;
int h = img.Height;
int wm = w-1;
int hm = h-1;
int wh = w*h;
int div = radius+radius+1;
int[] r = new int[wh];
int[] g = new int[wh];
int[] b = new int[wh];
int rsum,gsum,bsum,x,y,i,p,p1,p2,yp,yi,yw;
int[] vmin = new int[Math.Max(w,h)];
int[] vmax = new int[Math.Max(w,h)];
int[] pix= new int[w*h];
img.GetPixels(pix, 0, w, 0,0,w, h);
int[] dv = new int[256*div];
for (i=0;i<256*div;i++){
dv[i]=(i/div);
}
yw=yi=0;
for (y=0;y<h;y++){
rsum=gsum=bsum=0;
for(i=-radius;i<=radius;i++){
p=pix[yi+Math.Min(wm,Math.Max(i,0))];
rsum+=(p & 0xff0000)>>16;
gsum+=(p & 0x00ff00)>>8;
bsum+= p & 0x0000ff;
}
for (x=0;x<w;x++){
r[yi]=dv[rsum];
g[yi]=dv[gsum];
b[yi]=dv[bsum];
if(y==0){
vmin[x]=Math.Min(x+radius+1,wm);
vmax[x]=Math.Max(x-radius,0);
}
p1=pix[yw+vmin[x]];
p2=pix[yw+vmax[x]];
rsum+=((p1 & 0xff0000)-(p2 & 0xff0000))>>16;
gsum+=((p1 & 0x00ff00)-(p2 & 0x00ff00))>>8;
bsum+= (p1 & 0x0000ff)-(p2 & 0x0000ff);
yi++;
}
yw+=w;
}
for (x=0;x<w;x++){
rsum=gsum=bsum=0;
yp=-radius*w;
for(i=-radius;i<=radius;i++){
yi=Math.Max(0,yp)+x;
rsum+=r[yi];
gsum+=g[yi];
bsum+=b[yi];
yp+=w;
}
yi=x;
for (y=0;y<h;y++){
// Preserve alpha channel: ( 0xff000000 & pix[yi] )
pix[yi] = (int)((0xff000000 & pix[yi]) | (dv[rsum] << 16) | (dv[gsum] << 8) | dv[bsum]);
if(x==0){
vmin[y]=Math.Min(y+radius+1,hm)*w;
vmax[y]=Math.Max(y-radius,0)*w;
}
p1=x+vmin[y];
p2=x+vmax[y];
rsum+=r[p1]-r[p2];
gsum+=g[p1]-g[p2];
bsum+=b[p1]-b[p2];
yi+=w;
}
}
img.SetPixels(pix,0, w,0,0,w,h);
return img;
}
/// <summary>
/// Mark bitmap with given face information
/// </summary>
/// <param name="originalBitmap"></param>
/// <param name="faces"></param>
/// <returns></returns>
private static Bitmap drawFaceRectanglesOnBitmap(Bitmap originalBitmap, Face[] faces)
{
Bitmap bitmap = originalBitmap.Copy(Bitmap.Config.Argb8888, true);
Canvas canvas = new Canvas(bitmap);
Paint paint = new Paint();
paint.Color = StrokeColor;
paint.StrokeWidth = strokeWidth;
paint.TextSize = textSize;
if (faces != null)
{
foreach(Face face in faces)
{
FaceRectangle faceRectangle = face.FaceRectangle;
paint.SetStyle(Paint.Style.Stroke);
canvas.DrawRect(
faceRectangle.Left,
faceRectangle.Top,
faceRectangle.Left + faceRectangle.Width,
faceRectangle.Top + faceRectangle.Height,
paint);
paint.SetStyle(Paint.Style.Fill);
canvas.DrawText(face.Attributes.Gender + ", " +
face.Attributes.Age + " y/o",
faceRectangle.Left, faceRectangle.Top - textSize, paint);
}
}
return bitmap;
}
private static Bitmap ChangeColor(Bitmap bitmap, Color fromColor, Color targetColor, float tolerance = 20)
{
int width = bitmap.Width;
int height = bitmap.Height;
int[] pixels = new int[width * height];
float[] redRange = new float[2]{
(float)Math.Max(fromColor.R - (tolerance / 2), 0.0),
(float)Math.Min(fromColor.R + (tolerance / 2), 255.0)};
float[] greenRange = new float[2]{
(float)Math.Max(fromColor.G - (tolerance / 2), 0.0),
(float)Math.Min(fromColor.G + (tolerance / 2), 255.0)};
float[] blueRange = new float[2]{
(float)Math.Max(fromColor.B - (tolerance / 2), 0.0),
(float)Math.Min(fromColor.B + (tolerance / 2), 255.0)};
bitmap.GetPixels(pixels, 0, width, 0, 0, width, height);
for (int i = 0; i < pixels.Length; i++)
{
if (pixels[i] == fromColor)
{
pixels[i] = new Color(targetColor.R, targetColor.G, targetColor.B, targetColor.A - 1);
}
int red = Color.GetRedComponent(pixels[i]);
int green = Color.GetGreenComponent(pixels[i]);
int blue = Color.GetBlueComponent(pixels[i]);
int alpha = Color.GetAlphaComponent(pixels[i]);
if (((red >= redRange[0]) && (red <= redRange[1])) &&
((green >= greenRange[0]) && (green <= greenRange[1])) &&
((blue >= blueRange[0]) && (blue <= blueRange[1])) &&
((alpha > 0 && alpha < 254)))
{
pixels[i] = new Color(targetColor.R, targetColor.G, targetColor.B, targetColor.A - 1);
}
}
if (bitmap.IsMutable)
{
bitmap.SetPixels(pixels, 0, width, 0, 0, width, height);
return bitmap;
}
else
{
var mutableBitmap = bitmap.Copy(bitmap.GetConfig(), true);
mutableBitmap.SetPixels(pixels, 0, width, 0, 0, width, height);
return mutableBitmap;
}
}
