C / C++ / MFC

<br />
the output of the camera is a RGBA32 image!<br />
<br />
CStatic m_Img1;<br />
unsigned char *ActImage;<br />
unsigned char *GrayMap;<br />
<br />
ActImage = new unsigned char[FireCapture->grabBufferSize];<br />
GrayMap = new unsigned char[FireCapture->grabBufferSize];<br />
<br />
memcpy(ActImage,FireCapture->FlippedBuffer,FireCapture->grabBufferSize);<br />
RGB2Gray(ActImage, GrayMap, FireCapture->grabBufferSize);<br />
<br />
Bitmap1.CreateBitmap(FireCapture->pVih->bmiHeader.biWidth, FireCapture->pVih->bmiHeader.biHeight,<br />
		     1,8,GrayMap);<br />
m_Img1.SetBitmap(Bitmap1);<br />
<br />
<br />
<br />
<br />
void CImageProcView::RGB2Gray(unsigned char *Img1, unsigned char *Img2, unsigned int ByteSize)<br />
{<br />
	for(int i = 0; i<ByteSize/4; i++)<br />
	{<br />
		Img2[i] = ((char)Img1[4*i] + (char)Img1[4*i+1] + (char)Img1[4*i+2]) / 3;<br />
	}<br />
}<br />

void CImageProcView::RGB2Gray(unsigned char *Img1, unsigned char *Img2, unsigned int ByteSize)
{
  for(int i = 0; i<ByteSize/4; i++)
  {
    Img2[i] = ((char)Img1[4*i] + (char)Img1[4*i+1] + (char)Img1[4*i+2]) / 3; // Incorrect
  }
}

void CImageProcView::RGB2Gray(unsigned char *Img1, unsigned char *Img2, unsigned int ByteSize)
{
  RGBQUAD *pSource = static_cast<RGBQUAD*>(Img1);
  RGBQUAD *pDest = static_cast<RGBQUAD*>(Img2);

  for(int i = 0; i<ByteSize/sizeof(RGBQUAD); i++)
  {
    pDest[i].rgbRed = pDest[i].rgbGreen = pDest[i].rgbBlue = (pSource[i].rgbBlue + pSource[i].rgbGreen + pSource[i].rgbRed) / 3;
    pDest[i].rgbReserved = 0;
  }
}

<br />
RGBQUAD *pSource = static_cast(Img1);<br />
static cast need a type to cast!! do you mean static_cast<RGBQUAD>(Img1); ?<br />
<br />
i always get a error C2440: 'static_cast' : cannot convert from 'unsigned char *' to 'RGBQUAD'<br />

<br />
error C2440: 'static_cast' : cannot convert from 'unsigned char *' to 'RGBQUAD *'<br />
        Types pointed to are unrelated; conversion requires reinterpret_cast, C-style cast or function-style cast<br />
<br />
<br />
RGB2Gray(ActImage, GrayMap, FireCapture->grabBufferSize);<br />
<br />
how can i set a palette in my case and display the grayscale image?<br />

<br />
	COMBOBOXINFO m_info;<br />
ZeroMemory(&m_info, sizeof(COMBOBOXINFO));<br />
m_info.cbSize = sizeof(COMBOBOXINFO);<br />
m_Combo.GetComboBoxInfo(&m_info);<br />
<br />
ModifyStyle(m_info.hwndItem,0,ES_NUMBER,0);<br />

for each vertical line -> 'y' coordinate
    for each pixel in the line -> 'x' coordinate
        if pixel color is red then
            if pixel directly on top is red and
               pixel directly at left is red and
               pixel directly at right is red and
               pixed directly at bottom is red then
                you found the plus symbol, which coordinates are (x; y)
            end if
        end if
    end for
end for

V_shr wrote:

speedy algorithm

_Russell_ wrote:

Try also something using some pre-processing operation, like noise filters and/or colors thresholds(-> RED plus)

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