Setpixel slow，替代setpixel。 [英] Setpixel slow, an alternative to setpixel.

问题描述

我试图将16位dicom数据转换为8位图像。我已将16位数据转换为8位数据。现在我想从这些数据创建位图。我正在使用setpixel这个目的，但似乎要慢得多。任何人都可以建议任何替代方案。我使用的代码如下：

I was trying to convert 16 bit dicom data to 8 bit image. I had converted the 16 bit data to 8 bit data. Now i want to create bitmap from this data. I was using setpixel for this purpose but it seems to be much slower. Can anyone pls suggest any alternative for this. The code i used is as below:

CImage img;
img.Create(m_nWidth, m_nHeight, 32);
for(int i = 0; i < m_nHeight; i++)
{
        for(int j = 0; j < m_nWidth; j++)
        {
                int nPixel = 0;
                nPixel = (Input[j][i] - nMinPixel) * fOffset; //conversion to 8bit data
                COLORREF clr(RGB(nPixel, nPixel, nPixel)); //nPixel is converted data
                img->SetPixel(j, i, clr);
        }
}

推荐答案

您应该直接使用图片的DIB部分。

请参阅 CImage :: GetBits 文档

You should use directly the "DIB" section of your image.
See the CImage::GetBits documentation

CImage img;
img.Create(m_nWidth, m_nHeigt, 32);
COLORREF* dib=(COLORREF*)img.GetBits();
for(int i=0; i<m_nheight;i++)>
{
  for(int j=0; j<m_nwidth;j++)>
  {
    int nPixel = 0;
    nPixel = (Input[j][i] - nMinPixel)* fOffset;
    dib[j+i*m_nWidth]=RGB(nPixel,nPixel,nPixel);
  }
}

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