C# 如何修复书页的暗显图像
我有1000张书页的图片，它的文字和这张一样暗淡C# 如何修复书页的暗显图像,c#,image-processing,C#,Image Processing,我有1000张书页的图片，它的文字和这张一样暗淡 现在我试图修复它，以便更清晰地阅读，我使用此代码 private Bitmap repairImage(Bitmap bmp) { Color cc=Color.FromArgb(255, 251, 251, 251); for (int x = 0; x < bmp.Width; x++) { for (int y = 0; y < bmp.Heig
现在我试图修复它，以便更清晰地阅读，我使用此代码
private Bitmap repairImage(Bitmap bmp)
{
Color cc=Color.FromArgb(255, 251, 251, 251);
for (int x = 0; x < bmp.Width; x++)
{
for (int y = 0; y < bmp.Height; y++)
{
if (bmp.GetPixel(x, y).R>238)
{
bmp.SetPixel(x, y, Color.White);
}
else
{
bmp.SetPixel(x, y, Color.Black);
}
}
}
return bmp;
}
私有位图图像（位图bmp）
{
Color cc=Color.FromArgb（255,251,251,251）；
对于（int x=0；x238）
{
bmp.SetPixel（x，y，Color.White）；
}
其他的
{
bmp.SetPixel（x，y，Color.Black）；
}
}
}
返回bmp；
}
还有别的办法解决这个问题吗？谢谢。我使用这个（C++）代码：
void picture::enhance_range()
{
int i,x,y,a0[4],min[4],max,n,c0,c1,q,c;
if (xs<1) return;
if (ys<1) return;
n=0; // dimensions to interpolate
if (pf==_pf_s ) { n=1; c0=0; c1=127*3; }
if (pf==_pf_u ) { n=1; c0=0; c1=255*3; }
if (pf==_pf_ss ) { n=2; c0=0; c1=32767; }
if (pf==_pf_uu ) { n=2; c0=0; c1=65535; }
if (pf==_pf_rgba) { n=4; c0=0; c1= 255; } // this is your image pixel format so ignore the other pf statements
// find min,max intensities
dec_color(a0,p[0][0],pf);
for (i=0;i<n;i++) min[i]=a0[i]; max=0;
for (y=0;y<ys;y++)
for (x=0;x<xs;x++)
{
dec_color(a0,p[y][x],pf); // this just unpack pixel color p[][] to a0[4]={r,g,b,a}
for (q=0,i=0;i<n;i++)
{
c=a0[i]; if (c<0) c=-c;
if (min[i]>c) min[i]=c;
if (max<c) max=c;
}
}
// change dynamic range to max
for (y=0;y<ys;y++)
for (x=0;x<xs;x++)
{
dec_color(a0,p[y][x],pf);
for (i=0;i<n;i++) a0[i]=c0+(((a0[i]-min[i])*(c1-c0))/(max-min[i]+1));
// for (i=0;i<n;i++) if (a0[i]<c0) a0[i]=c0; // clamp if needed
// for (i=0;i<n;i++) if (a0[i]>c1) a0[i]=c1; // clamp if needed
enc_color(a0,p[y][x],pf); // this just pack a0[4]={r,g,b,a} to pixel color p[][]
}
}
color=(color-min)*255/(max-min);
getpixel，您当前的方法速度很慢，setpixel- 看
void picture::enhance_range()
{
int i,x,y,a0[4],min[4],max,n,c0,c1,q,c;
if (xs<1) return;
if (ys<1) return;
n=0; // dimensions to interpolate
if (pf==_pf_s ) { n=1; c0=0; c1=127*3; }
if (pf==_pf_u ) { n=1; c0=0; c1=255*3; }
if (pf==_pf_ss ) { n=2; c0=0; c1=32767; }
if (pf==_pf_uu ) { n=2; c0=0; c1=65535; }
if (pf==_pf_rgba) { n=4; c0=0; c1= 255; } // this is your image pixel format so ignore the other pf statements
// find min,max intensities
dec_color(a0,p[0][0],pf);
for (i=0;i<n;i++) min[i]=a0[i]; max=0;
for (y=0;y<ys;y++)
for (x=0;x<xs;x++)
{
dec_color(a0,p[y][x],pf); // this just unpack pixel color p[][] to a0[4]={r,g,b,a}
for (q=0,i=0;i<n;i++)
{
c=a0[i]; if (c<0) c=-c;
if (min[i]>c) min[i]=c;
if (max<c) max=c;
}
}
// change dynamic range to max
for (y=0;y<ys;y++)
for (x=0;x<xs;x++)
{
dec_color(a0,p[y][x],pf);
for (i=0;i<n;i++) a0[i]=c0+(((a0[i]-min[i])*(c1-c0))/(max-min[i]+1));
// for (i=0;i<n;i++) if (a0[i]<c0) a0[i]=c0; // clamp if needed
// for (i=0;i<n;i++) if (a0[i]>c1) a0[i]=c1; // clamp if needed
enc_color(a0,p[y][x],pf); // this just pack a0[4]={r,g,b,a} to pixel color p[][]
}
}
color=(color-min)*255/(max-min);
getpixel，您当前的方法速度很慢，setpixel- 看
您的方法的另一个缺点是，您只需对图像进行二值化，从而使所有渲染的文本消除混叠…我所能想到的最好方法是使用内置类来更改图像的Gamma和对比度 以下是
Gamma=6.27对比度=+1.04using System.Drawing.Imaging;
..
public static Bitmap ApplyGamma(Bitmap bmp0, float gamma, float contrast)
{
Bitmap bmp1 = new Bitmap(bmp0.Width, bmp0.Height);
using (Graphics g = Graphics.FromImage(bmp1))
{
ColorMatrix colorMatrix = new ColorMatrix(new float[][]
{
new float[] {contrast, 0, 0, 0, 0},
new float[] {0,contrast, 0, 0, 0},
new float[] {0, 0, contrast, 0, 0},
new float[] {0, 0, 0, 1, 0},
new float[] {0, 0, 0, 0, 1}
});
ImageAttributes attributes = new ImageAttributes();
attributes.SetColorMatrix(colorMatrix, ColorMatrixFlag.Default,
ColorAdjustType.Bitmap);
attributes.SetGamma(gamma, ColorAdjustType.Bitmap);
g.DrawImage(bmp0, new Rectangle(0, 0, bmp0.Width, bmp0.Height),
0, 0, bmp0.Width, bmp0.Height, GraphicsUnit.Pixel, attributes);
}
return bmp1;
}
轨迹栏标签float gamma = 1f ;
float contrast = 1f;
private void trackBar1_Scroll(object sender, EventArgs e)
{
gamma = 1f * trackBar1.Value / 100f;
label1.Text = gamma.ToString("#0.00");
pictureBox1.Image = ApplyGamma(originalImage, gamma, contrast);
}
private void trackBar2_Scroll(object sender, EventArgs e)
{
contrast = 1f * trackBar2.Value / 1000f;
label2.Text = contrast.ToString("#0.00");
pictureBox1.Image = ApplyGamma(originalImage, gamma, contrast);
}
请注意，我正在泄漏位图；只是为了测试；-） 我能想到的最好方法是使用内置类来更改图像的Gamma和对比度 以下是
Gamma=6.27对比度=+1.04using System.Drawing.Imaging;
..
public static Bitmap ApplyGamma(Bitmap bmp0, float gamma, float contrast)
{
Bitmap bmp1 = new Bitmap(bmp0.Width, bmp0.Height);
using (Graphics g = Graphics.FromImage(bmp1))
{
ColorMatrix colorMatrix = new ColorMatrix(new float[][]
{
new float[] {contrast, 0, 0, 0, 0},
new float[] {0,contrast, 0, 0, 0},
new float[] {0, 0, contrast, 0, 0},
new float[] {0, 0, 0, 1, 0},
new float[] {0, 0, 0, 0, 1}
});
ImageAttributes attributes = new ImageAttributes();
attributes.SetColorMatrix(colorMatrix, ColorMatrixFlag.Default,
ColorAdjustType.Bitmap);
attributes.SetGamma(gamma, ColorAdjustType.Bitmap);
g.DrawImage(bmp0, new Rectangle(0, 0, bmp0.Width, bmp0.Height),
0, 0, bmp0.Width, bmp0.Height, GraphicsUnit.Pixel, attributes);
}
return bmp1;
}
轨迹栏标签float gamma = 1f ;
float contrast = 1f;
private void trackBar1_Scroll(object sender, EventArgs e)
{
gamma = 1f * trackBar1.Value / 100f;
label1.Text = gamma.ToString("#0.00");
pictureBox1.Image = ApplyGamma(originalImage, gamma, contrast);
}
private void trackBar2_Scroll(object sender, EventArgs e)
{
contrast = 1f * trackBar2.Value / 1000f;
label2.Text = contrast.ToString("#0.00");
pictureBox1.Image = ApplyGamma(originalImage, gamma, contrast);
}
请注意，我正在泄漏位图；只是为了测试；-） 看这里：（避免对每个像素使用GetPixel（）和SetPixel（））查找gamma和ColorMatrix！请参见，特别是指南的链接！看这里：（避免对每个像素使用GetPixel（）和SetPixel（））查找gamma和ColorMatrix！请参见，特别是指南的链接！对我来说，这应该快几千倍，听起来相当乐观。@TaW如果编码正确，一点也不。。。每个
setpixelgetpixelScanLine10000xgetpielsetpixelgetpixelsetpixelsetpixelgetpixelScanLine10000xgetpielsetpixelgetpixelsetpixel