此代碼用於將顏色轉換爲黑色和白色。並行c#線程性能問題
- 我試圖平行部添加到代碼
- 剛剛從灰度變換到黑白
- 我試圖分配給每個線程數的cols的,其具有的像素的量
但性能沒有改善。
我試圖通過更改2 for循環中的除數值(其中800代碼)和計數器值增量800 * 600圖像。
這種變化應該使線程的數量增加或減少
結果:
value | num of thread | time
800 1 1.17 sec
400 2 1.17 sec
200 4 1.17 sec
and so on ...
幫我提高性能怎麼把它需要更大的圖片8秒,我希望把它平行
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Diagnostics;
using System.Threading;
namespace IMG
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
string path = "";
public void openimage()
{
if (openFileDialog1.ShowDialog() == DialogResult.OK)
{
path = openFileDialog1.FileName;
}
}
Bitmap bm;
Bitmap gs;
private void button1_Click(object sender, EventArgs e)
{
if (path == "")
{
openimage();
}
Graphics g = this.CreateGraphics();
bm = new Bitmap(path);
// Draw image with no effects.....
g.DrawImage(bm, 100, 100, 200, 200);
gs = new Bitmap(bm.Width, bm.Height);
worker soso = new worker(gs, bm);
worker.counter = 0;
soso.tograyscale();
// Draw gray image.......
g.DrawImage(gs, 305, 100, 200, 200);
DateTime x = DateTime.Now;
for (int koko = 0; koko < gs.Width/400; koko++)
{
Thread t1 = new Thread(new ThreadStart(soso.trasform));
t1.Start();
t1.Join();
soso.increment();
}
g.DrawImage(bm, 510, 100, 200, 200);
gs.Dispose();
g.Dispose();
textBox19.Text=(DateTime.Now - x).ToString();
}
}
public class worker
{
public static int counter = 0;
public Bitmap gs;
public Bitmap bm;
public int xxxx;
public worker(Bitmap a, Bitmap b)
{
gs = a;
bm = b;
xxxx = a.Height;
}
public void increment()
{
counter += 400;
}
public void trasform()
{
argtransform(counter);
}
public void tograyscale()
{
for (int i = 0; i < bm.Width; i++)
{
for (int j = 0; j < bm.Height; j++)
{
Color c = bm.GetPixel(i, j);
int y = (int)(0.3 * c.R + 0.59 * c.G + 0.11 * c.B);
gs.SetPixel(i, j, Color.FromArgb(y, y, y));
}
}
}
public void argtransform(int cc)
{
for (int i = cc; i < cc + 400; i++)
{
for (int j = 0; j < xxxx; j++)
{
Color c = gs.GetPixel(i, j);
int y1 = 0;
if (c.R >= 128)
y1 = 255;
bm.SetPixel(i, j, Color.FromArgb(y1, y1, y1));
}
}
}
}
}
儘快請U可以
謝謝謝謝大家 Craig Stuntz問題:如何在不調用setpixel的情況下編輯像素的顏色? 感謝您的幫助
週期是你的朋友;他們劃定下一句話。 – Joe 2010-01-11 16:03:57
Profiler也是你的朋友! – 2010-01-11 16:32:27