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POError when converting Bitmap to Iplimage
 

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  1. POError when converting Bitmap to Iplimage
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    <p>I have a .net bitmap that must be converted to Open Cv image </p> <p>On the .net side I am doing the following :</p> <pre><code> b = new Bitmap(@"C:\Projects\samples\alfarok.jpg"); b = b.Clone(new Rectangle(0, 0, b.Width, b.Height), PixelFormat.Format24bppRgb); Rectangle rect = new Rectangle(0, 0, b.Width, b.Height); BitmapData bmpData = b.LockBits(rect, ImageLockMode.ReadWrite, b.PixelFormat); IntPtr ptr = bmpData.Scan0; int stride = bmpData.Stride; int numBytes = b.Width * b.Height * 3; byte[] rgbValues = new byte[numBytes]; for (int r = 0; r &lt; bmpData.Height; ++r) Marshal.Copy(new IntPtr((int)ptr + stride * r), rgbValues, bmpData.Width * 3 * r, bmpData.Width * 3); wrapper.DetectDocumentPatter(b.GetHbitmap(), rgbValues,b.Width,b.Height, numBytes); </code></pre> <p>In umanaged I am receiving an HBITMAP handle and byte array. I'm trying to build the DIB image first, but an exception is usually thrown: <code>std::bad_alloc at memory location 0x004ffb6c</code>.</p> <pre><code>BITMAP bmp; HDC hdc = GetDC(NULL); GetObject(b,sizeof(tagBITMAP),&amp;bmp); long dwcBihSize = sizeof(BITMAPINFOHEADER); long dwSize = dwcBihSize +(2&gt;&gt;bmp.bmBitsPixel) * sizeof(RGBQUAD) + ((bmp.bmBitsPixel * width) * height); LPBITMAPINFO pDIB =(LPBITMAPINFO) new BYTE[dwSize]; // check this ! pDIB-&gt;bmiHeader.biSize = dwcBihSize; pDIB-&gt;bmiHeader.biWidth = width; pDIB-&gt;bmiHeader.biHeight = height; pDIB-&gt;bmiHeader.biBitCount = bmp.bmBitsPixel; pDIB-&gt;bmiHeader.biPlanes = 1; pDIB-&gt;bmiHeader.biCompression = BI_RGB; pDIB-&gt;bmiHeader.biXPelsPerMeter = 1000 ; pDIB-&gt;bmiHeader.biYPelsPerMeter = 1000; pDIB-&gt;bmiHeader.biClrUsed = 0; pDIB-&gt;bmiHeader.biClrImportant = 0; LPRGBQUAD lpColors =(LPRGBQUAD)(pDIB+pDIB-&gt;bmiHeader.biSize); SetDIBColorTable(hdc,0,2&gt;&gt;bmp.bmBitsPixel * sizeof(RGBQUAD),lpColors); int dibCols = 2&gt;&gt;pDIB-&gt;bmiHeader.biBitCount; void* bitArray = pDIB + pDIB-&gt;bmiHeader.biSize+dibCols *sizeof(RGBQUAD); for(int i=0;i&lt;dibCols;i++) { lpColors[i].rgbRed=0; lpColors[i].rgbBlue=0; lpColors[i].rgbGreen=0; lpColors[i].rgbReserved=0; } SetDIBColorTable(hdc,0,dibCols,lpColors); int depth =bmp.bmBitsPixel == 1 ? IPL_DEPTH_1U : IPL_DEPTH_8U; int nChannels = 3; //IplImage* image= cvCreateImage(cvSize(width,height),depth,3); GetDIBits(hdc,b,0,height,bitArray,pDIB,DIB_RGB_COLORS); //image-&gt;imageData = (char*)bitArray; //memcpy(image-&gt;imageData,(char*)(bmp.bmBits),bmp.bmHeight*bmp.bmWidth*3); //cvSaveImage("c:\img.jpg",image); </code></pre> <p>Am I doing things right, or is there a more suitable approach? Why might the error <code>std::bad_alloc at memory location 0x004ffb6c</code> be thrown?</p>
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    1. PTQuestion
    1. USHannele
    1. USYamen Ajjour
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
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    1. This table or related slice is empty.
    1. VO
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      1. POError when converting Bitmap to Iplimage
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
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      1. POError when converting Bitmap to Iplimage
      1. This table or related slice is empty.
      1. VTApproveEditSuggestion
    3. VO
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      1. POError when converting Bitmap to Iplimage
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      1. VTUpMod
    1. CODoes `bitArray` contain the correct info throughout that array? If not, double-check all portions of `bmiHeader` as a start.
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      1. POError when converting Bitmap to Iplimage
      1. USChris O
 

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