我一直在研究一個代碼,它將圖像轉化爲灰度,然後根據按下哪個按鈕進行圖像處理。當按下一個按鈕(例如,平均3x3,Prewitt 5x5)時,它將調用2D乘法函數,該函數會在灰度圖像上循環,同時循環遍歷內核,並添加矩陣中的所有值。如果任何值超過255,則將其設置爲255.然後在臨時位圖變量上使用SetPixel,最終將其置於picturebox中。當我運行該程序時,我選擇了一個圖像並將其顯示(作爲灰度),但是在選擇其中一個過濾器後,程序凍結了大約30秒,然後沒有任何更改,也沒有應用過濾器。我試過調試,我似乎無法找到問題所在!使用平均內核的圖像處理
編輯:。在最初的問題已經解決了(我不得不刷新PictureBox的新圖像的正確顯示 但我在這裏面臨的另一問題與問候的普魯伊特內核
我得到這個錯誤 「附加信息:'-6'的值對於'紅'無效,'紅'應該大於或等於0且小於或等於255.」
我不知道該怎麼辦在我的代碼中更改以解決此問題。
初始化:
public partial class Form1 : Form
{
private Image img;
Bitmap grayscaleimage;
double[][] AVGKernel = new double[11][];
double[][] PrewittKernel = new double[11][];
int[] AVGKernal1DH = new int[11];
int[] AVGKernal1DV = new int[11];
Bitmap tempBitmap;
public Form1()
{
InitializeComponent();
for (int i = 0; i < 11; i++)
{
AVGKernel[i] = new double[11];
PrewittKernel[i] = new double[11];
for (int j = 0; j < 11; j++)
{
AVGKernel[i][j] = 0;
PrewittKernel[i][j] = 0;
AVGKernal1DH[j] = 0;
AVGKernal1DV[j] = 0;
}
}
}
開放按鈕並轉動圖像爲灰度:
private void OpenImageButton(object sender, EventArgs e)
{
OpenFileDialog openFileDialog = new OpenFileDialog();
if (openFileDialog.ShowDialog() == DialogResult.OK)
{
this.img = Image.FromFile(openFileDialog.FileName);
grayscaleimage = new Bitmap(img);
int rgb;
Color c;
for (int y = 0; y < grayscaleimage.Height; y++)
for (int x = 0; x < grayscaleimage.Width; x++)
{
c = grayscaleimage.GetPixel(x, y);
rgb = (int)((c.R + c.G + c.B)/3);
grayscaleimage.SetPixel(x, y, Color.FromArgb(rgb, rgb, rgb));
}
this.pictureBox1.BackgroundImage = grayscaleimage;
pictureBox1.BackgroundImageLayout = ImageLayout.Zoom;
}
}
可用的許多按鈕的一個示例:
private void button5_Click(object sender, EventArgs e)
{
AVGKernel[0][0] = 1; AVGKernel[0][1] = 1; AVGKernel[0][2] = 1; AVGKernel[0][3] = 1; AVGKernel[0][4] = 1;
AVGKernel[1][0] = 1; AVGKernel[1][1] = 1; AVGKernel[1][2] = 1; AVGKernel[1][3] = 1; AVGKernel[1][4] = 1;
AVGKernel[2][0] = 1; AVGKernel[2][1] = 1; AVGKernel[2][2] = 1; AVGKernel[2][3] = 1; AVGKernel[2][4] = 1;
AVGKernel[3][0] = 1; AVGKernel[3][1] = 1; AVGKernel[3][2] = 1; AVGKernel[3][3] = 1; AVGKernel[3][4] = 1;
AVGKernel[4][0] = 1; AVGKernel[4][1] = 1; AVGKernel[4][2] = 1; AVGKernel[4][3] = 1; AVGKernel[4][4] = 1;
kernal2DMultiplication(AVGKernel, 5);
this.pictureBox1.BackgroundImage = tempBitmap;
}
Prewitt算子的5×5內核
private void button13_Click(object sender, EventArgs e)
{
PrewittKernel[0][0] = 2; PrewittKernel[0][1] = 1; PrewittKernel[0][2] = 0; PrewittKernel[0][3] = -1; PrewittKernel[0][4] = -2;
PrewittKernel[1][0] = 2; PrewittKernel[1][1] = 1; PrewittKernel[1][2] = 0; PrewittKernel[1][3] = -1; PrewittKernel[1][4] = -2;
PrewittKernel[2][0] = 2; PrewittKernel[2][1] = 1; PrewittKernel[2][2] = 0; PrewittKernel[2][3] = -1; PrewittKernel[2][4] = -2;
PrewittKernel[3][0] = 2; PrewittKernel[3][1] = 1; PrewittKernel[3][2] = 0; PrewittKernel[3][3] = -1; PrewittKernel[3][4] = -2;
PrewittKernel[4][0] = 2; PrewittKernel[4][1] = 1; PrewittKernel[4][2] = 0; PrewittKernel[4][3] = -1; PrewittKernel[4][4] = -2;
kernal2DMultiplication(PrewittKernel, 5);
this.pictureBox1.BackgroundImage = tempBitmap;
this.pictureBox1.Refresh();
}
和最後,該函數被調用:
private void kernal2DMultiplication(double[][] kernel, int size)
{
tempBitmap = grayscaleimage;
double nrgb = 0;
for (int i = 0; i < grayscaleimage.Width - size/2; i++)
{
for (int j = 0; j < grayscaleimage.Height - size/2; j++)
{
if (i >= size/2 && j >= size/2)
{
for (int k = 0; k < size; k++)
for (int l = 0; l < size; l++)
nrgb += grayscaleimage.GetPixel(i + k - (size/2), j + l - (size/2)).R * kernel[k][l];
nrgb = nrgb/(size * size);
if (nrgb > 255)
nrgb = 255;
tempBitmap.SetPixel(i, j, Color.FromArgb((int)nrgb, (int)nrgb, (int)nrgb));
}
}
}
}
如果將灰度圖像「grayscaleimage」保存到文件中並將其打開,例如Paint(或類似),您是看到灰色圖像還是黑色? – Sjips 2014-11-03 19:10:46
@Sjips它的灰色 – 2014-11-03 19:14:21
嗯,GetPixel/SetPixel是相對較慢的操作。也許通過添加'Debug.WriteLine'語句,你可以看到什麼代碼正在執行,並且你在哪裏結束了一個無限循環(如果發生這種情況)。 – Sjips 2014-11-03 19:20:45