Pikselleri yeni bir yazılabilir bitmap'e yazarak

Question

programı, bu https://www.youtube.com/watch?v=l1_WmoiKgPg'u, videonun sadece ilk 50sini ikinci sekmenin bittiğini yazıyor :) Temel olarak, en fazla kırmızıyla rengi seçiyorsunuz, o zaman en yeşil olanı ise en yeşil ise mavi. ama yeni piksel yeni görüntüye neden yazılmıyor? ve ilk radyo düğmesi rasgele sınıfla nasıl yapılır?

Benim özel yöntemleri:

private void writepixel(WriteableBitmap ElWriteableBitmap, int iCoordX, int iCoordY, byte bRojo, byte bVerde, byte bAzul, byte bAlfa) 
{ 
    unsafe 
    { 
     int ipTempBackBuffer = (int)ElWriteableBitmap.BackBuffer; 
     ipTempBackBuffer += iCoordY * ElWriteableBitmap.BackBufferStride; 
     ipTempBackBuffer += iCoordX * 4; 

     int color_data = bAlfa << 24; // Canal alfa 
     color_data |= bRojo << 16; // Componente rojo 
     color_data |= bVerde << 8; // Componente verde 
     //color_data = color_data & (bVerde << 8); 
     color_data |= bAzul << 0; // Componente azul 

     *((int*)ipTempBackBuffer) = color_data; 
    } 
} 

private System.Windows.Media.Color readPixel(WriteableBitmap ElWriteableBitmap, int iCoordX, int iCoordY) 
{ 
    System.Windows.Media.Color colorResultante = new System.Windows.Media.Color(); 
    unsafe 
    { 
     int ipTempBackBuffer = (int)ElWriteableBitmap.BackBuffer; 
     ipTempBackBuffer += iCoordY * ElWriteableBitmap.BackBufferStride; 
     ipTempBackBuffer += iCoordX * 4; 

     colorResultante.A = ((byte*)ipTempBackBuffer)[3]; 
     colorResultante.R = ((byte*)ipTempBackBuffer)[2]; 
     colorResultante.G = ((byte*)ipTempBackBuffer)[1]; 
     colorResultante.B = ((byte*)ipTempBackBuffer)[0]; 
    } 
    return colorResultante; 
} 

2 resim

private void Button_Click(object sender, RoutedEventArgs e) 
{ 
    OpenFileDialog ofd = new OpenFileDialog(); 
    ofd.FileName = "Imagen"; 
    ofd.DefaultExt = ".bmp"; 
    ofd.Filter = "Mapas de bits|*.bmp"; 
    Nullable<bool> result = ofd.ShowDialog(); 
    if (result == true) 
    { 
     BitmapImage bmpi = new BitmapImage(); //JpegBitmapEncoder alternativa 
     bmpi.BeginInit(); 
     bmpi.UriSource = new Uri(ofd.FileName); 
     bmpi.EndInit(); 
     m_wbmpLaImagen = new WriteableBitmap(bmpi); 
     laimagen1.Source = m_wbmpLaImagen; 
    } 
} 

private void Button_Click_1(object sender, RoutedEventArgs e) 
{ 
    OpenFileDialog ofd = new OpenFileDialog(); 
    ofd.FileName = "Imagen"; 
    ofd.DefaultExt = ".bmp"; 
    ofd.Filter = "Mapas de bits|*.bmp"; 
    Nullable<bool> result = ofd.ShowDialog(); 
    if (result == true) 
    { 
     BitmapImage bmpi = new BitmapImage(); //JpegBitmapEncoder alternativa 
     bmpi.BeginInit(); 
     bmpi.UriSource = new Uri(ofd.FileName); 
     bmpi.EndInit(); 
     m_wbmpLaImagen = new WriteableBitmap(bmpi); 
     laimagen2.Source = m_wbmpLaImagen; 
    } 
} 

Benim rastgele sınıf ve iki radyo düğmeleri için kod yüklendi:

private static int[] randomNumber() 
{ 
    Random rand = new Random(); 
    int[] nums = new int[20]; 
    for (int x = 0; x < 1; x++) 
    { 
     nums[x] = rand.Next(); 
    } 
    return nums; 
} 

private void RadioButton_Checked(object sender, RoutedEventArgs e) 
{ 
    WriteableBitmap imagen1bmp; 
    WriteableBitmap imagen2bmp; 
    WriteableBitmap imgcom; 
    imgcom = (WriteableBitmap)imgcombined.Source; 
    int x, y; 
    Color col3 = new Color(); 
    imagen1bmp = (WriteableBitmap)laimagen1.Source; 
    imagen2bmp = (WriteableBitmap)laimagen2.Source;   

    for (y = 0; y < imagen1bmp.Height; y++) 
    { 
     for (x = 0; x < imagen1bmp.Width; x++) 
     { 
      // Get both colors in the pixel point 
      Color col1 = readPixel(imagen1bmp, x, y); 
      Color col2 = readPixel(imagen2bmp, x, y); 
      // the color for the output image for this pixel 
      if (col1.R > col2.R) 
       col3.R = col1.R; 
      else 
       col3.R = col2.R; 
      if (col1.G > col2.G) 
       col3.G = col1.G; 
      else 
       col3.G = col2.G; 

      if (col1.B > col2.B) 
       col3.B = col1.B; 
      else 
       col3.B = col2.B; 

      if (col1.A > col2.A) 
       col3.A = col1.A; 
      else 
       col3.A = col2.A; 

      writepixel(imgcom, x, y, col3.R, col3.G, col3.B, col3.A); 
     } 
     UpdateLayout(); 
    } 
    UpdateLayout(); 
} 

Answer 1

dört hatalar var senin kodu:

Hata 1) imgcom doğru boyutlarda yeni bir bitmap ile örneklenemedi. Çözelti:

imgcom = new WriteableBitmap(imagen1bmp); 
// Make changes... 
imgcombined.Source = imgcom; 

Hata 2) döngüler görüntü piksel boyutları (Width ve Height) yerine iç tampon boyutları (PixelWidth ve PixelHeight) kullanılarak yapıldı. Çözelti:

for (y = 0; y < imagen1bmp.PixelHeight; y++) 
for (x = 0; x < imagen1bmp.PixelWidth; x++) 

Hata 3) hedef tampon sırasıyla kilitlenir ve yazma çevresinde kilidi açıldıktan değildi. Çözelti:

imgcom.Lock(); 
// Change the pixels... 
imgcom.Unlock(); 

Hata 4) arabelleğe ofset tamponun int işaretçi ile BackBufferStride kullanılarak yapıldı. Tampon adımı piksel değil, bayt sayısını ifade ettiğinden bu yanlış. Çözüm:

ipTempBackBuffer += (iCoordY * ElWriteableBitmap.PixelWidth) + iCoordX; 

Fonksiyonel sonuç:

private WriteableBitmap m_wbmpLaImagen; 

public MainWindow() 
{ 
    InitializeComponent(); 
} 

private void button_load_1_Click(object sender, RoutedEventArgs e) 
{ 
    OpenFileDialog ofd = new OpenFileDialog(); 
    ofd.FileName = "Imagen"; 
    ofd.DefaultExt = ".bmp"; 
    ofd.Filter = "Mapas de bits|*.bmp"; 
    Nullable<bool> result = ofd.ShowDialog(); 
    if (result == true) 
    { 
     BitmapImage bmpi = new BitmapImage(); //JpegBitmapEncoder alternativa 
     bmpi.BeginInit(); 
     bmpi.UriSource = new Uri(ofd.FileName); 
     bmpi.EndInit(); 
     m_wbmpLaImagen = new WriteableBitmap(bmpi); 
     laimagen1.Source = m_wbmpLaImagen; 
    } 
} 

private void button_load_2_Click(object sender, RoutedEventArgs e) 
{ 
    OpenFileDialog ofd = new OpenFileDialog(); 
    ofd.FileName = "Imagen"; 
    ofd.DefaultExt = ".bmp"; 
    ofd.Filter = "Mapas de bits|*.bmp"; 
    Nullable<bool> result = ofd.ShowDialog(); 
    if (result == true) 
    { 
     BitmapImage bmpi = new BitmapImage(); //JpegBitmapEncoder alternativa 
     bmpi.BeginInit(); 
     bmpi.UriSource = new Uri(ofd.FileName); 
     bmpi.EndInit(); 
     m_wbmpLaImagen = new WriteableBitmap(bmpi); 
     laimagen2.Source = m_wbmpLaImagen; 
    } 
} 

private void button_do_processing_Click(object sender, RoutedEventArgs e) 
{ 
    WriteableBitmap imagen1bmp; 
    WriteableBitmap imagen2bmp; 
    WriteableBitmap imgcom; 
    int x, y; 
    Color col3 = new Color(); 
    imagen1bmp = (WriteableBitmap)laimagen1.Source; 
    imagen2bmp = (WriteableBitmap)laimagen2.Source; 
    imgcom = new WriteableBitmap(imagen1bmp); 

    imgcom.Lock();// Prepare BackBuffer for writing; 
    for (y = 0; y < imagen1bmp.PixelHeight; y++) 
    { 
     for (x = 0; x < imagen1bmp.PixelWidth; x++) 
     { 
      // Get both colors in the pixel point 
      Color col1 = readPixel(imagen1bmp, x, y); 
      Color col2 = readPixel(imagen2bmp, x, y); 
      // the color for the output image for this pixel 
      if (col1.R > col2.R) 
       col3.R = col1.R; 
      else 
       col3.R = col2.R; 
      if (col1.G > col2.G) 
       col3.G = col1.G; 
      else 
       col3.G = col2.G; 

      if (col1.B > col2.B) 
       col3.B = col1.B; 
      else 
       col3.B = col2.B; 

      if (col1.A > col2.A) 
       col3.A = col1.A; 
      else 
       col3.A = col2.A; 

      writepixel(imgcom, x, y, col3.R, col3.G, col3.B, col3.A); 
     } 
     UpdateLayout(); 
    } 
    imgcom.Unlock();// Release BackBuffer from writing; 
    UpdateLayout(); 
    imgcombined.Source = imgcom; 
} 

private static int[] randomNumber() 
{ 
    Random rand = new Random(); 
    int[] nums = new int[20]; 
    for (int x = 0; x < 1; x++) 
    { 
     nums[x] = rand.Next(); 
    } 
    return nums; 
} 

private void writepixel(WriteableBitmap ElWriteableBitmap, int iCoordX, int iCoordY, byte bRojo, byte bVerde, byte bAzul, byte bAlfa) 
{ 
    unsafe 
    { 
     int *ipTempBackBuffer = (int *)ElWriteableBitmap.BackBuffer; 
     ipTempBackBuffer += (iCoordY * ElWriteableBitmap.PixelWidth) + iCoordX; 

     int color_data = bAlfa << 24; // Canal alfa 
     color_data |= bRojo << 16; // Componente rojo 
     color_data |= bVerde << 8; // Componente verde 
     //color_data = color_data & (bVerde << 8); 
     color_data |= bAzul << 0; // Componente azul 

     *ipTempBackBuffer = color_data; 
    } 
} 

private System.Windows.Media.Color readPixel(WriteableBitmap ElWriteableBitmap, int iCoordX, int iCoordY) 
{ 
    System.Windows.Media.Color colorResultante = new System.Windows.Media.Color(); 
    unsafe 
    { 
     int *ipTempBackBuffer = (int *)ElWriteableBitmap.BackBuffer; 
     ipTempBackBuffer += (iCoordY * ElWriteableBitmap.PixelWidth) + iCoordX; 

     colorResultante.A = ((byte *)ipTempBackBuffer)[3]; 
     colorResultante.R = ((byte *)ipTempBackBuffer)[2]; 
     colorResultante.G = ((byte *)ipTempBackBuffer)[1]; 
     colorResultante.B = ((byte *)ipTempBackBuffer)[0]; 
    } 
    return colorResultante; 
}