protected void uploadorigin_onclick(object sender, EventArgs e)
{
Button btn = sender as Button;
RepeaterItem ri = btn.NamingContainer as RepeaterItem;
FileUpload fu = ri.FindControl("fu") as FileUpload;
DropDownList ddl = ri.FindControl("alpha_list") as DropDownList;
if (fu.HasFile)
{
Session.Add(fu.PostedFile.FileName, new AltariaImage(new Bitmap(fu.PostedFile.InputStream), fu.PostedFile.FileName));
step3.Visible = true;
embed.Visible = false;
//Extract watermark
int alpha = (int)(Convert.ToDouble(ddl.SelectedValue) * 10.0);
original_img.ImageUrl = "ImageHandler.ashx?original=" + fu.PostedFile.FileName;
extracted_img.ImageUrl = "ImageHandler.ashx?file=" + ((Label)(ri.FindControl("ci"))).Text + "&wm=" + fu.PostedFile.FileName + "&mode=abfull_ex_rand&alpha=" + alpha;
AltariaImage nai = new AltariaImage(new Bitmap(fu.PostedFile.InputStream), fu.PostedFile.FileName).SaltAndPepper(5);
Session.Add("snp1", nai);
snp1.ImageUrl = "ImageHandler.ashx?original=snp1";
extracted_snp1.ImageUrl = "ImageHandler.ashx?file=" + ((Label)(ri.FindControl("ci"))).Text + "&wm=snp1&mode=abfull_ex_rand&alpha=" + alpha;
AltariaImage nai2 = new AltariaImage(new Bitmap(fu.PostedFile.InputStream), fu.PostedFile.FileName).CompressImage(50L);
Session.Add("compress1", nai2);
compress1.ImageUrl = "ImageHandler.ashx?original=compress1";
extracted_compress1.ImageUrl = "ImageHandler.ashx?file=" + ((Label)(ri.FindControl("ci"))).Text + "&wm=compress1&mode=abfull_ex_rand&alpha=" + alpha;
}
}
protected void uploadorigin_onclick(object sender, EventArgs e)
{
Button btn = sender as Button;
RepeaterItem ri = btn.NamingContainer as RepeaterItem;
FileUpload fu = ri.FindControl("fu") as FileUpload;
DropDownList ddl = ri.FindControl("alpha_list") as DropDownList;
if (fu.HasFile)
{
Session.Add(fu.PostedFile.FileName, new AltariaImage(new Bitmap(fu.PostedFile.InputStream), fu.PostedFile.FileName));
step3.Visible = true;
embed.Visible = false;
//Extract watermark
int alpha = (int)(Convert.ToDouble(ddl.SelectedValue) * 10.0);
original_img.ImageUrl = "ImageHandler.ashx?original=" + fu.PostedFile.FileName;
extracted_img.ImageUrl = "ImageHandler.ashx?file=" + ((Label)(ri.FindControl("ci"))).Text + "&wm=" + fu.PostedFile.FileName + "&mode=abfull_ex_rand&alpha=" + alpha;
AltariaImage nai = new AltariaImage(new Bitmap(fu.PostedFile.InputStream), fu.PostedFile.FileName).SaltAndPepper(5);
Session.Add("snp1", nai);
snp1.ImageUrl = "ImageHandler.ashx?original=snp1";
extracted_snp1.ImageUrl = "ImageHandler.ashx?file=" + ((Label)(ri.FindControl("ci"))).Text + "&wm=snp1&mode=abfull_ex_rand&alpha=" + alpha;
AltariaImage nai2 = new AltariaImage(new Bitmap(fu.PostedFile.InputStream), fu.PostedFile.FileName).CompressImage(50L);
Session.Add("compress1", nai2);
compress1.ImageUrl = "ImageHandler.ashx?original=compress1";
extracted_compress1.ImageUrl = "ImageHandler.ashx?file=" + ((Label)(ri.FindControl("ci"))).Text + "&wm=compress1&mode=abfull_ex_rand&alpha=" + alpha;
}
}
/// <summary>
/// Performs a salt and pepper attack on the bmp.
/// </summary>
/// <param name="p">the intensity to perform the attack at</param>
/// <returns>the resulting image</returns>
internal AltariaImage SaltAndPepper(double p)
{
AltariaImage nai = new AltariaImage(new Bitmap(this.originalbmp), this.Name);
SaltAndPepperNoise filter = new SaltAndPepperNoise(p);
filter.ApplyInPlace(nai.originalbmp);
return(nai);
}
protected void UploadedImages_ItemDataBound(object sender, RepeaterItemEventArgs riea)
{
step1.Visible = false;
if (riea.Item.ItemType == ListItemType.Item || riea.Item.ItemType == ListItemType.AlternatingItem)
{
//AltariaImage ai = riea.Item.DataItem as AltariaImage;
AltariaImage ai = riea.Item.DataItem as AltariaImage;
if (ai.watermarked)
{
//watermarked
riea.Item.FindControl("wm_form").Visible = false;
}
else
{
//not watermarked, embed watermark
}
}
}
//Upload file
protected void upload_onclick(object sender, EventArgs e)
{
if (Page.IsValid)
{
HttpFileCollection hfc = Request.Files;
for (int i = 0; i < hfc.Count; i++)
{
HttpPostedFile file = hfc[i];
AltariaImage temp_ai = new AltariaImage(new Bitmap(file.InputStream), file.FileName);
ai.Add(temp_ai);
//add uploaded file to session
Session.Add(file.FileName, temp_ai);
}
UploadedImages.DataSource = ai;
step2.Visible = true;
UploadedImages.DataBind();
}
}
/// <summary>
/// Embeds a watermark to the planes with alpha blending.
/// </summary>
/// <param name="wm">The watermark to embed</param>
/// <param name="alpha">alpha. defaults to 0.9.</param>
public void AlphaBlend(AltariaImage wm, double alpha = 0.9)
{
if (wm.IsTransformed())
{
// SII=alpha*(CI) + (1.0-alpha)*(SI)
//alpha ranges from 0.0 to 1.0
Bitmap rbmp = new Bitmap(wm.r_plane);
Bitmap gbmp = new Bitmap(wm.g_plane);
Bitmap bbmp = new Bitmap(wm.b_plane);
double finalpixel = 0;
//Final pixel = alpha * (First image's source pixel) + (1.0-alpha) * (Second image's source pixel)
//embed r_plane into all sub bands
for (int i = 0; i < Width; i++)
{
for (int j = 0; j < Height; j++)
{
finalpixel = alpha * r_plane.GetPixel(i, j).R + (1.0 - alpha) * rbmp.GetPixel(i, j).R;
er_plane.SetPixel(i, j, Color.FromArgb((int)finalpixel, (int)finalpixel, (int)finalpixel));
}
}
//embed g_plane into all sub bands
for (int i = 0; i < Width; i++)
{
for (int j = 0; j < Height; j++)
{
finalpixel = alpha * g_plane.GetPixel(i, j).G + (1.0 - alpha) * gbmp.GetPixel(i, j).G;
eg_plane.SetPixel(i, j, Color.FromArgb((int)finalpixel, (int)finalpixel, (int)finalpixel));
}
}
//embed b_plane into all sub bands
for (int i = 0; i < Width; i++)
{
for (int j = 0; j < Height; j++)
{
finalpixel = alpha * b_plane.GetPixel(i, j).B + (1.0 - alpha) * bbmp.GetPixel(i, j).B;
eb_plane.SetPixel(i, j, Color.FromArgb((int)finalpixel, (int)finalpixel, (int)finalpixel));
}
}
watermarked = true;
}
}
/// <summary>
/// Performs a salt and pepper attack on the bmp.
/// </summary>
/// <param name="p">the intensity to perform the attack at</param>
/// <returns>the resulting image</returns>
internal AltariaImage SaltAndPepper(double p)
{
AltariaImage nai = new AltariaImage(new Bitmap(this.originalbmp), this.Name);
SaltAndPepperNoise filter = new SaltAndPepperNoise(p);
filter.ApplyInPlace(nai.originalbmp);
return nai;
}
/// <summary>
/// Extract the watermark
/// </summary>
/// <param name="origin">The original image to compare with the watermarked image</param>
/// <param name="wm_height">optional. specifies the watermark height. defaults to 32.</param>
/// <param name="wm_width">optional. specifies the watermark width. defaults to 32.</param>
/// <param name="random">optional. specifies whether the watermark has been embedded randomly. defaults to false.</param>
/// <param name="alpha">optional. specifies the alpha. defaults to AltariaImage's constant alpha.</param>
public Bitmap ExtractWatermark(AltariaImage origin, bool random = false, int wm_height = 32, int wm_width = 32, double alpha = alpha)
{
//get hl and lh of the planes as individual bitmaps
Bitmap hl_r, lh_r;
Bitmap hl_g, lh_g;
Bitmap hl_b, lh_b;
Bitmap origin_hl_r, origin_lh_r;
Bitmap origin_hl_g, origin_lh_g;
Bitmap origin_hl_b, origin_lh_b;
double finalpixel = 0;
Bitmap result = new Bitmap(wm_width, wm_height);
Rectangle hl_crop = new Rectangle(Width / 2, 0, Width / 2, Height / 2);
Rectangle lh_crop = new Rectangle(0, Height / 2, Width / 2, Height / 2);
// r_plane
hl_r = r_plane.Clone(hl_crop, r_plane.PixelFormat);
lh_r = r_plane.Clone(lh_crop, r_plane.PixelFormat);
origin_hl_r = origin.r_plane.Clone(hl_crop, origin.r_plane.PixelFormat);
origin_lh_r = origin.r_plane.Clone(lh_crop, origin.r_plane.PixelFormat);
// g_plane
hl_g = g_plane.Clone(hl_crop, g_plane.PixelFormat);
lh_g = g_plane.Clone(lh_crop, g_plane.PixelFormat);
origin_hl_g = origin.g_plane.Clone(hl_crop, origin.g_plane.PixelFormat);
origin_lh_g = origin.g_plane.Clone(lh_crop, origin.g_plane.PixelFormat);
// r_plane
hl_b = b_plane.Clone(hl_crop, b_plane.PixelFormat);
lh_b = b_plane.Clone(lh_crop, b_plane.PixelFormat);
origin_hl_b = origin.b_plane.Clone(hl_crop, origin.b_plane.PixelFormat);
origin_lh_b = origin.b_plane.Clone(lh_crop, origin.b_plane.PixelFormat);
List<Bitmap> watermarks = new List<Bitmap>();
if (random)
{
//extract the embedded watermarks from the randomized embedding
//determine the position of placement based on maximum coefficient of original image
int max_hl_r = 0, max_hl_g = 0, max_hl_b = 0;
int max_lh_r = 0, max_lh_g = 0, max_lh_b = 0;
for (int i = 0; i < hl_r.Width; i++)
for (int j = 0; j < hl_r.Height; j++)
{
int temp = hl_r.GetPixel(i, j).R;
//oh yeah ternary operations because I am lazy
//hl
max_hl_r = temp > max_hl_r ? temp : max_hl_r;
temp = hl_g.GetPixel(i, j).G;
max_hl_g = temp > max_hl_g ? temp : max_hl_g;
temp = hl_b.GetPixel(i, j).B;
max_hl_b = temp > max_hl_b ? temp : max_hl_b;
//lh
temp = lh_r.GetPixel(i, j).R;
max_lh_r = temp > max_lh_r ? temp : max_lh_r;
temp = lh_g.GetPixel(i, j).G;
max_lh_g = temp > max_lh_g ? temp : max_lh_g;
temp = lh_b.GetPixel(i, j).B;
max_lh_b = temp > max_lh_b ? temp : max_lh_b;
}
//extracting the watermark
for (int i = 0, ii = hl_r.Width - wm_width; i < wm_width; i++, ii++)
{
//hl_r
for (int j = 0, start = max_hl_r; j < wm_height; j++, start++)
{
int s = start % hl_r.Width;
finalpixel = (hl_r.GetPixel(i, s).R - alpha * origin_hl_r.GetPixel(i, s).R) / (1.0 - alpha);
if (finalpixel < 0 || finalpixel > 255) finalpixel = 0;
result.SetPixel(i, j, Color.FromArgb((int)finalpixel, (int)finalpixel, (int)finalpixel));
}
watermarks.Add(result);
//hl_g
for (int j = 0, start = max_hl_g; j < wm_height; j++, start++)
{
int s = start % hl_g.Width;
finalpixel = (hl_g.GetPixel(ii, s).G - alpha * origin_hl_g.GetPixel(ii, s).G) / (1.0 - alpha);
if (finalpixel < 0 || finalpixel > 255) finalpixel = 0;
result.SetPixel(i, j, Color.FromArgb((int)finalpixel, (int)finalpixel, (int)finalpixel));
}
watermarks.Add(result);
//hl_b
for (int j = 0, jj = hl_b.Height - wm_height, start = max_hl_b; j < wm_height; j++, start++, jj++)
{
finalpixel = (hl_b.GetPixel(i, jj).B - alpha * origin_hl_b.GetPixel(i, jj).B) / (1.0 - alpha);
if (finalpixel < 0 || finalpixel > 255) finalpixel = 0;
result.SetPixel(i, j, Color.FromArgb((int)finalpixel, (int)finalpixel, (int)finalpixel));
}
watermarks.Add(result);
//lh_r
for (int j = 0, start = max_lh_r; j < wm_height; j++, start++)
{
int s = start % lh_r.Width;
finalpixel = (lh_r.GetPixel(i, s).R - alpha * origin_lh_r.GetPixel(i, s).R) / (1.0 - alpha);
if (finalpixel < 0 || finalpixel > 255) finalpixel = 0;
result.SetPixel(i, j, Color.FromArgb((int)finalpixel, (int)finalpixel, (int)finalpixel));
}
watermarks.Add(result);
//lh_g
for (int j = 0, start = max_lh_g; j < wm_height; j++, start++)
{
int s = start % lh_g.Width;
finalpixel = (lh_g.GetPixel(ii, s).G - alpha * origin_lh_g.GetPixel(ii, s).G) / (1.0 - alpha);
if (finalpixel < 0 || finalpixel > 255) finalpixel = 0;
result.SetPixel(i, j, Color.FromArgb((int)finalpixel, (int)finalpixel, (int)finalpixel));
}
watermarks.Add(result);
//lh_b
for (int j = 0, jj = lh_b.Height - wm_height, start = max_lh_b; j < wm_height; j++, start++, jj++)
{
finalpixel = (lh_b.GetPixel(i, jj).B - alpha * origin_lh_b.GetPixel(i, jj).B) / (1.0 - alpha);
if (finalpixel < 0 || finalpixel > 255) finalpixel = 0;
result.SetPixel(i, j, Color.FromArgb((int)finalpixel, (int)finalpixel, (int)finalpixel));
}
watermarks.Add(result);
}
}
else
{
//extract the embedded watermarks
for (int i = 0; i < wm_width; i++)
for (int j = 0; j < wm_height; j++)
{
//lh_r
finalpixel = (lh_r.GetPixel(i, j).R - alpha * origin_lh_r.GetPixel(i, j).R) / (1.0 - alpha);
if (finalpixel < 0 || finalpixel > 255) finalpixel = 0;
result.SetPixel(i, j, Color.FromArgb((int)finalpixel, (int)finalpixel, (int)finalpixel));
}
watermarks.Add(result);
for (int i = 0; i < wm_width; i++)
for (int j = 0; j < wm_height; j++)
{
//hl_r
finalpixel = (hl_r.GetPixel(i, j).R - alpha * origin_hl_r.GetPixel(i, j).R) / (1.0 - alpha);
if (finalpixel < 0 || finalpixel > 255) finalpixel = 0;
result.SetPixel(i, j, Color.FromArgb((int)finalpixel, (int)finalpixel, (int)finalpixel));
}
watermarks.Add(result);
for (int i = 0; i < wm_width; i++)
for (int j = 0; j < wm_height; j++)
{
//lh_g
finalpixel = (lh_g.GetPixel(i, j).G - alpha * origin_lh_g.GetPixel(i, j).G) / (1.0 - alpha);
if (finalpixel < 0 || finalpixel > 255) finalpixel = 0;
result.SetPixel(i, j, Color.FromArgb((int)finalpixel, (int)finalpixel, (int)finalpixel));
}
watermarks.Add(result);
for (int i = 0; i < wm_width; i++)
for (int j = 0; j < wm_height; j++)
{
//hl_g
finalpixel = (hl_g.GetPixel(i, j).G - alpha * origin_hl_g.GetPixel(i, j).G) / (1.0 - alpha);
if (finalpixel < 0 || finalpixel > 255) finalpixel = 0;
result.SetPixel(i, j, Color.FromArgb((int)finalpixel, (int)finalpixel, (int)finalpixel));
}
watermarks.Add(result);
for (int i = 0; i < wm_width; i++)
for (int j = 0; j < wm_height; j++)
{
//lh_b
finalpixel = (lh_b.GetPixel(i, j).B - alpha * origin_lh_b.GetPixel(i, j).B) / (1.0 - alpha);
if (finalpixel < 0 || finalpixel > 255) finalpixel = 0;
result.SetPixel(i, j, Color.FromArgb((int)finalpixel, (int)finalpixel, (int)finalpixel));
}
watermarks.Add(result);
for (int i = 0; i < wm_width; i++)
for (int j = 0; j < wm_height; j++)
{
//hl_b
finalpixel = (hl_b.GetPixel(i, j).B - alpha * origin_hl_b.GetPixel(i, j).B) / (1.0 - alpha);
if (finalpixel < 0 || finalpixel > 255) finalpixel = 0;
result.SetPixel(i, j, Color.FromArgb((int)finalpixel, (int)finalpixel, (int)finalpixel));
}
watermarks.Add(result);
}
Bitmap finalresult = new Bitmap(wm_width * 6, wm_height);
using (Graphics g = Graphics.FromImage(finalresult))
{
for (int i = 0; i < 6; i++)
{
g.DrawImage(watermarks[i], i * wm_width, 0);
}
}
//test
finalresult.Save("C:\\temp\\result.bmp");
return finalresult;
}
/// <summary>
/// Embeds a watermark to the planes with alpha blending.
/// </summary>
/// <param name="wm">The watermark to embed</param>
/// <param name="alpha">alpha. defaults to 0.9.</param>
public void AlphaBlend(AltariaImage wm, double alpha = 0.9)
{
if (wm.IsTransformed())
{
// SII=alpha*(CI) + (1.0-alpha)*(SI)
//alpha ranges from 0.0 to 1.0
Bitmap rbmp = new Bitmap(wm.r_plane);
Bitmap gbmp = new Bitmap(wm.g_plane);
Bitmap bbmp = new Bitmap(wm.b_plane);
double finalpixel = 0;
//Final pixel = alpha * (First image's source pixel) + (1.0-alpha) * (Second image's source pixel)
//embed r_plane into all sub bands
for (int i = 0; i < Width; i++)
for (int j = 0; j < Height; j++)
{
finalpixel = alpha * r_plane.GetPixel(i, j).R + (1.0 - alpha) * rbmp.GetPixel(i, j).R;
er_plane.SetPixel(i, j, Color.FromArgb((int)finalpixel, (int)finalpixel, (int)finalpixel));
}
//embed g_plane into all sub bands
for (int i = 0; i < Width; i++)
for (int j = 0; j < Height; j++)
{
finalpixel = alpha * g_plane.GetPixel(i, j).G + (1.0 - alpha) * gbmp.GetPixel(i, j).G;
eg_plane.SetPixel(i, j, Color.FromArgb((int)finalpixel, (int)finalpixel, (int)finalpixel));
}
//embed b_plane into all sub bands
for (int i = 0; i < Width; i++)
for (int j = 0; j < Height; j++)
{
finalpixel = alpha * b_plane.GetPixel(i, j).B + (1.0 - alpha) * bbmp.GetPixel(i, j).B;
eb_plane.SetPixel(i, j, Color.FromArgb((int)finalpixel, (int)finalpixel, (int)finalpixel));
}
watermarked = true;
}
}
public void ProcessRequest(HttpContext context)
{
string filename = context.Request.QueryString["file"];
string wmname = context.Request.QueryString["wm"];
string mode = context.Request.QueryString["mode"];
string original = context.Request.QueryString["original"];
context.Response.ContentType = "image/bmp";
if (original != null)
{
try
{
((AltariaImage)context.Session[original]).originalbmp.Save(context.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Png);
}
catch (Exception)
{
((Bitmap)context.Session[original]).Save(context.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Bmp);
}
}
else
//start embed of watermark
//--------------------------------------START------------------------------------------------------//
//step 1: Two images are taken as input
//AltariaImage wm = new AltariaImage(new Bitmap(fu.PostedFile.InputStream), fu.PostedFile.FileName);
//AltariaImage wm = new AltariaImage(fu.PostedFile.InputStream, fu.PostedFile.FileName);
//AltariaImage ci = (AltariaImage)Session[((Label)(ri.FindControl("ci"))).Text];
if (wmname != null && mode != null)
{
AltariaImage wm = (AltariaImage)context.Session[wmname];
AltariaImage ci = (AltariaImage)context.Session[filename];
if (!ci.IsTransformed())
{
ci.HaarTransform();
}
if (!wm.IsTransformed())
{
wm.HaarTransform();
}
//save the transform to session to avoid transformation again
context.Session[filename] = ci;
context.Session[wmname] = wm;
if (mode == "aball")
{
try
{
string alpha = context.Request.QueryString["alpha"];
double a = Convert.ToDouble(alpha) / 10.0;
ci.AlphaBlend(wm, a);
}
catch
{
ci.AlphaBlend(wm);
}
ci.HaarRestore();
ci.ConcatPlanes();
ci.concatbmp.Save(context.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Bmp);
}
else if (mode == "aball_plane")
{
ci.AlphaBlend(wm, 0.7);
ci.er_plane.Save(context.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Bmp);
}
else if (mode == "abfull")
{
try
{
string alpha = context.Request.QueryString["alpha"];
double a = Convert.ToDouble(alpha) / 10.0;
ci.AdvancedAlphaBlend(alpha: a);
}
catch (Exception)
{
ci.AdvancedAlphaBlend();
}
ci.HaarRestore();
ci.ConcatPlanes();
ci.concatbmp.Save(context.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Bmp);
}
else if (mode == "abfull_plane")
{
ci.AdvancedAlphaBlend(0.5);
ci.er_plane.Save(context.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Bmp);
}
else if (mode == "abfull_all")
{
try
{
string alpha = context.Request.QueryString["alpha"];
double a = Convert.ToDouble(alpha) / 10.0;
ci.AdvancedAlphaBlend(alpha: a, allplanes: true);
}
catch (Exception)
{
ci.AdvancedAlphaBlend(allplanes: true);
}
ci.HaarRestore();
ci.ConcatPlanes();
ci.concatbmp.Save(context.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Bmp);
}
else if (mode == "abfull_all_plane")
{
ci.AdvancedAlphaBlend(alpha: 0.7, allplanes: true);
ci.er_plane.Save(context.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Bmp);
}
else if (mode == "abfull_rand")
{
try
{
string alpha = context.Request.QueryString["alpha"];
double a = Convert.ToDouble(alpha) / 10.0;
ci.AdvancedAlphaBlend(alpha: a, random: true);
}
catch (Exception)
{
ci.AdvancedAlphaBlend(random: true);
}
ci.HaarRestore();
ci.ConcatPlanes();
ci.concatbmp.Save(context.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Bmp);
}
else if (mode == "abfull_rand_plane")
{
ci.AdvancedAlphaBlend(alpha: 0.7, random: true);
ci.eb_plane.Save(context.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Bmp);
}
else if (mode == "abfull_ex")
{
Bitmap ex_wm = ci.ExtractWatermark(wm);
ex_wm.Save(context.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Bmp);
}
else if (mode == "abfull_ex_rand")
{
Bitmap ex_wm;
try
{
string alpha = context.Request.QueryString["alpha"];
double a = Convert.ToDouble(alpha) / 10.0;
ex_wm = ci.ExtractWatermark(wm, true, alpha: a);
}
catch (Exception)
{
ex_wm = ci.ExtractWatermark(wm, true);
}
ex_wm.Save(context.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Bmp);
}
}
else
{
AltariaImage ci = (AltariaImage)context.Session[filename];
ci.originalbmp.Save(context.Response.OutputStream, System.Drawing.Imaging.ImageFormat.Bmp);
}
}
//Upload file
protected void upload_onclick(object sender, EventArgs e)
{
if (Page.IsValid)
{
HttpFileCollection hfc = Request.Files;
for (int i = 0; i < hfc.Count; i++)
{
HttpPostedFile file = hfc[i];
AltariaImage temp_ai = new AltariaImage(new Bitmap(file.InputStream), file.FileName);
ai.Add(temp_ai);
//add uploaded file to session
Session.Add(file.FileName, temp_ai);
}
UploadedImages.DataSource = ai;
step2.Visible = true;
UploadedImages.DataBind();
}
}
/// <summary>
/// Extract the watermark
/// </summary>
/// <param name="origin">The original image to compare with the watermarked image</param>
/// <param name="wm_height">optional. specifies the watermark height. defaults to 32.</param>
/// <param name="wm_width">optional. specifies the watermark width. defaults to 32.</param>
/// <param name="random">optional. specifies whether the watermark has been embedded randomly. defaults to false.</param>
/// <param name="alpha">optional. specifies the alpha. defaults to AltariaImage's constant alpha.</param>
public Bitmap ExtractWatermark(AltariaImage origin, bool random = false, int wm_height = 32, int wm_width = 32, double alpha = alpha)
{
//get hl and lh of the planes as individual bitmaps
Bitmap hl_r, lh_r;
Bitmap hl_g, lh_g;
Bitmap hl_b, lh_b;
Bitmap origin_hl_r, origin_lh_r;
Bitmap origin_hl_g, origin_lh_g;
Bitmap origin_hl_b, origin_lh_b;
double finalpixel = 0;
Bitmap result = new Bitmap(wm_width, wm_height);
Rectangle hl_crop = new Rectangle(Width / 2, 0, Width / 2, Height / 2);
Rectangle lh_crop = new Rectangle(0, Height / 2, Width / 2, Height / 2);
// r_plane
hl_r = r_plane.Clone(hl_crop, r_plane.PixelFormat);
lh_r = r_plane.Clone(lh_crop, r_plane.PixelFormat);
origin_hl_r = origin.r_plane.Clone(hl_crop, origin.r_plane.PixelFormat);
origin_lh_r = origin.r_plane.Clone(lh_crop, origin.r_plane.PixelFormat);
// g_plane
hl_g = g_plane.Clone(hl_crop, g_plane.PixelFormat);
lh_g = g_plane.Clone(lh_crop, g_plane.PixelFormat);
origin_hl_g = origin.g_plane.Clone(hl_crop, origin.g_plane.PixelFormat);
origin_lh_g = origin.g_plane.Clone(lh_crop, origin.g_plane.PixelFormat);
// r_plane
hl_b = b_plane.Clone(hl_crop, b_plane.PixelFormat);
lh_b = b_plane.Clone(lh_crop, b_plane.PixelFormat);
origin_hl_b = origin.b_plane.Clone(hl_crop, origin.b_plane.PixelFormat);
origin_lh_b = origin.b_plane.Clone(lh_crop, origin.b_plane.PixelFormat);
List <Bitmap> watermarks = new List <Bitmap>();
if (random)
{
//extract the embedded watermarks from the randomized embedding
//determine the position of placement based on maximum coefficient of original image
int max_hl_r = 0, max_hl_g = 0, max_hl_b = 0;
int max_lh_r = 0, max_lh_g = 0, max_lh_b = 0;
for (int i = 0; i < hl_r.Width; i++)
{
for (int j = 0; j < hl_r.Height; j++)
{
int temp = hl_r.GetPixel(i, j).R;
//oh yeah ternary operations because I am lazy
//hl
max_hl_r = temp > max_hl_r ? temp : max_hl_r;
temp = hl_g.GetPixel(i, j).G;
max_hl_g = temp > max_hl_g ? temp : max_hl_g;
temp = hl_b.GetPixel(i, j).B;
max_hl_b = temp > max_hl_b ? temp : max_hl_b;
//lh
temp = lh_r.GetPixel(i, j).R;
max_lh_r = temp > max_lh_r ? temp : max_lh_r;
temp = lh_g.GetPixel(i, j).G;
max_lh_g = temp > max_lh_g ? temp : max_lh_g;
temp = lh_b.GetPixel(i, j).B;
max_lh_b = temp > max_lh_b ? temp : max_lh_b;
}
}
//extracting the watermark
for (int i = 0, ii = hl_r.Width - wm_width; i < wm_width; i++, ii++)
{
//hl_r
for (int j = 0, start = max_hl_r; j < wm_height; j++, start++)
{
int s = start % hl_r.Width;
finalpixel = (hl_r.GetPixel(i, s).R - alpha * origin_hl_r.GetPixel(i, s).R) / (1.0 - alpha);
if (finalpixel < 0 || finalpixel > 255)
{
finalpixel = 0;
}
result.SetPixel(i, j, Color.FromArgb((int)finalpixel, (int)finalpixel, (int)finalpixel));
}
watermarks.Add(result);
//hl_g
for (int j = 0, start = max_hl_g; j < wm_height; j++, start++)
{
int s = start % hl_g.Width;
finalpixel = (hl_g.GetPixel(ii, s).G - alpha * origin_hl_g.GetPixel(ii, s).G) / (1.0 - alpha);
if (finalpixel < 0 || finalpixel > 255)
{
finalpixel = 0;
}
result.SetPixel(i, j, Color.FromArgb((int)finalpixel, (int)finalpixel, (int)finalpixel));
}
watermarks.Add(result);
//hl_b
for (int j = 0, jj = hl_b.Height - wm_height, start = max_hl_b; j < wm_height; j++, start++, jj++)
{
finalpixel = (hl_b.GetPixel(i, jj).B - alpha * origin_hl_b.GetPixel(i, jj).B) / (1.0 - alpha);
if (finalpixel < 0 || finalpixel > 255)
{
finalpixel = 0;
}
result.SetPixel(i, j, Color.FromArgb((int)finalpixel, (int)finalpixel, (int)finalpixel));
}
watermarks.Add(result);
//lh_r
for (int j = 0, start = max_lh_r; j < wm_height; j++, start++)
{
int s = start % lh_r.Width;
finalpixel = (lh_r.GetPixel(i, s).R - alpha * origin_lh_r.GetPixel(i, s).R) / (1.0 - alpha);
if (finalpixel < 0 || finalpixel > 255)
{
finalpixel = 0;
}
result.SetPixel(i, j, Color.FromArgb((int)finalpixel, (int)finalpixel, (int)finalpixel));
}
watermarks.Add(result);
//lh_g
for (int j = 0, start = max_lh_g; j < wm_height; j++, start++)
{
int s = start % lh_g.Width;
finalpixel = (lh_g.GetPixel(ii, s).G - alpha * origin_lh_g.GetPixel(ii, s).G) / (1.0 - alpha);
if (finalpixel < 0 || finalpixel > 255)
{
finalpixel = 0;
}
result.SetPixel(i, j, Color.FromArgb((int)finalpixel, (int)finalpixel, (int)finalpixel));
}
watermarks.Add(result);
//lh_b
for (int j = 0, jj = lh_b.Height - wm_height, start = max_lh_b; j < wm_height; j++, start++, jj++)
{
finalpixel = (lh_b.GetPixel(i, jj).B - alpha * origin_lh_b.GetPixel(i, jj).B) / (1.0 - alpha);
if (finalpixel < 0 || finalpixel > 255)
{
finalpixel = 0;
}
result.SetPixel(i, j, Color.FromArgb((int)finalpixel, (int)finalpixel, (int)finalpixel));
}
watermarks.Add(result);
}
}
else
{
//extract the embedded watermarks
for (int i = 0; i < wm_width; i++)
{
for (int j = 0; j < wm_height; j++)
{
//lh_r
finalpixel = (lh_r.GetPixel(i, j).R - alpha * origin_lh_r.GetPixel(i, j).R) / (1.0 - alpha);
if (finalpixel < 0 || finalpixel > 255)
{
finalpixel = 0;
}
result.SetPixel(i, j, Color.FromArgb((int)finalpixel, (int)finalpixel, (int)finalpixel));
}
}
watermarks.Add(result);
for (int i = 0; i < wm_width; i++)
{
for (int j = 0; j < wm_height; j++)
{
//hl_r
finalpixel = (hl_r.GetPixel(i, j).R - alpha * origin_hl_r.GetPixel(i, j).R) / (1.0 - alpha);
if (finalpixel < 0 || finalpixel > 255)
{
finalpixel = 0;
}
result.SetPixel(i, j, Color.FromArgb((int)finalpixel, (int)finalpixel, (int)finalpixel));
}
}
watermarks.Add(result);
for (int i = 0; i < wm_width; i++)
{
for (int j = 0; j < wm_height; j++)
{
//lh_g
finalpixel = (lh_g.GetPixel(i, j).G - alpha * origin_lh_g.GetPixel(i, j).G) / (1.0 - alpha);
if (finalpixel < 0 || finalpixel > 255)
{
finalpixel = 0;
}
result.SetPixel(i, j, Color.FromArgb((int)finalpixel, (int)finalpixel, (int)finalpixel));
}
}
watermarks.Add(result);
for (int i = 0; i < wm_width; i++)
{
for (int j = 0; j < wm_height; j++)
{
//hl_g
finalpixel = (hl_g.GetPixel(i, j).G - alpha * origin_hl_g.GetPixel(i, j).G) / (1.0 - alpha);
if (finalpixel < 0 || finalpixel > 255)
{
finalpixel = 0;
}
result.SetPixel(i, j, Color.FromArgb((int)finalpixel, (int)finalpixel, (int)finalpixel));
}
}
watermarks.Add(result);
for (int i = 0; i < wm_width; i++)
{
for (int j = 0; j < wm_height; j++)
{
//lh_b
finalpixel = (lh_b.GetPixel(i, j).B - alpha * origin_lh_b.GetPixel(i, j).B) / (1.0 - alpha);
if (finalpixel < 0 || finalpixel > 255)
{
finalpixel = 0;
}
result.SetPixel(i, j, Color.FromArgb((int)finalpixel, (int)finalpixel, (int)finalpixel));
}
}
watermarks.Add(result);
for (int i = 0; i < wm_width; i++)
{
for (int j = 0; j < wm_height; j++)
{
//hl_b
finalpixel = (hl_b.GetPixel(i, j).B - alpha * origin_hl_b.GetPixel(i, j).B) / (1.0 - alpha);
if (finalpixel < 0 || finalpixel > 255)
{
finalpixel = 0;
}
result.SetPixel(i, j, Color.FromArgb((int)finalpixel, (int)finalpixel, (int)finalpixel));
}
}
watermarks.Add(result);
}
Bitmap finalresult = new Bitmap(wm_width * 6, wm_height);
using (Graphics g = Graphics.FromImage(finalresult))
{
for (int i = 0; i < 6; i++)
{
g.DrawImage(watermarks[i], i * wm_width, 0);
}
}
//test
finalresult.Save("C:\\temp\\result.bmp");
return(finalresult);
}