August 30, 2008 02:16am pdt

1. jkr 96,361
2. evilrix 91,200
3. alb66 63,791
4. Infinity08 47,108
5. jaime_oliv... 44,453
6. DanRollins 40,013
7. itsmeandn... 24,904
8. Gurudenis 24,760
9. AndyAins... 17,850
10. mrwad99 9,396
11. LordOfPo... 9,100
12. Zoppo 8,775
13. josgood 8,380
14. wayside 7,550
15. JohnGaby 6,300
16. primeMov... 6,000
17. sunnycoder 4,300
18. ozo 4,000
18. Qlemo 4,000
20. rstaveley 3,850
21. Kdo 3,624
22. peetm 3,450
23. mahesh1... 3,400
24. RQuadling 3,000
24. AlexNek 3,000

1. jkr 551,307
2. itsmeandn... 212,169
3. Axter 180,294
4. evilrix 109,940
5. Infinity08 108,409
6. jaime_oliv... 100,798
7. DanRollins 92,997
8. alb66 77,186
9. AndyAins... 73,766
10. AlexFM 69,034
11. nietod 56,535
12. rstaveley 54,916
13. wayside 32,681
14. efn 31,360
15. Zoppo 29,350
16. mahesh1... 27,375
17. Gurudenis 24,760
18. Kdo 24,660
19. burcarpat 21,374
20. Salte 20,760
21. mrwad99 19,136
22. sunnycoder 18,600
23. mrblue 17,170
24. josgood 16,620
25. ambience 16,500

03.05.2008 at 12:39AM PST, ID: 23215272

	[x] Attachment Details

Converting Bitmap in 2D Array

Asked by andy06 in Microsoft Visual C++, Microsoft Visual C#.Net, Signal Processing

Tags: C++, image processing,bitmap,Win32 API

Hi everyone ,
I'm doing image processing for the first time and I'm working with VC++ 6.0 under WinXP.
I would like to create a function which loads an 8 bit grayscale bitmap image and convert it
into a 2D array where each element represents one of the image's
pixel intensities for further purposes e.g. to calculate the fft.I saw quite similar
examples on this homepage but none of them returns an 2D array.
My code is attached in Code Snippet
The problem is that I would like to have the values of the array returned and I don't know how it should look like inside LRESULT CALLBACK WndProc function(I'm using Win32 API).And I'm also getting error message because of following declarations:
BYTE tempScanLine[WIDTH * 1] // error C2057:it should be a constant expression
//error C2466 : can't reserved an array of size 0
// error C2133: 'tempScanLine' : unknown parameter
const double grayscale[WIDTH*HEIGHT]; // error C2133: 'grayscale' : unknown parameter
I thought of writing grayscale=new double [WIDTH*HEIGHT] but then I have to give the memory free
and I can't return the array anymore right?
Thank youStart Free Trial

         
           
             1:
2:
3:
4:
5:
6:
7:
8:
9:
10:
11:
12:
13:
14:
15:
16:
17:
18:
19:
20:
21:
22:
23:
24:
25:
26:
27:
28:
29:
30:
31:
32:
33:
34:
35:
36:
37:
38:
39:
40:
41:
42:

           
           
             LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{	
static HBITMAP hbitmap;
int WIDTH, HEIGHT;
switch (message)
     {
   case WM_PAINT:
				
HANDLE hObj = LoadImage(NULL,"image.bmp", IMAGE_BITMAP, 0, 0, LR_LOADFROMFILE);
HDC hdc = CreateCompatibleDC(NULL);
SelectObject(hdc, hObj);
BITMAPINFO bInfo;
bInfo.bmiHeader.biSize = sizeof(bInfo.bmiHeader);
bInfo.bmiHeader.biWidth = WIDTH;
bInfo.bmiHeader.biHeight = HEIGHT;
bInfo.bmiHeader.biPlanes = 1;
bInfo.bmiHeader.biBitCount = 8; 
bInfo.bmiHeader.biCompression = BI_RGB;
BYTE tempScanLine[WIDTH ];
BYTE info[HEIGHT][WIDTH][1];
BITMAPINFO bi;
ZeroMemory(&bi, sizeof(BITMAPINFO));
bi.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
int count = HEIGHT - 1;
const double grayscale[WIDTH*HEIGHT];
for(int j = 0; j < HEIGHT; ++j)
{
      // find the width of the object
      GetDIBits(hdc, (HBITMAP) hObj, j, 1, NULL, &bi, DIB_RGB_COLORS);
 
      // store the color values in a 3D array of bytes
      GetDIBits(hdc, (HBITMAP) hObj, j, 1, tempScanLine, &bInfo, DIB_RGB_COLORS);
      for(int z = 0; z < bi.bmiHeader.biWidth; ++z)
      {
            info[count][z][0] = tempScanLine[(z * 1) + 2];    
            info[count][z][1] = tempScanLine[(z * 1) + 1];     
            info[count][z][2] = tempScanLine[(z * 1) + 0];                   
          //Transform to gray values
            grayscale[z]=info[count][z][0]*0.299 + info[count][z][1]*0.587+info[count][z][2]*0.114;
      }
     --count;
}
           
         

Keywords: Converting Bitmap in 2D Array

	Title
1	Create Two Dimensional Array of Bitma…
2	Extract Bitmap Pixel Information
3	Bitmap on dialog?
4	bitmaps in vc++
5	BitMaps
6	mask grayscale bitmap to rgb bitmap

Loading Advertisement...

20080716-EE-VQP-32 / EE_QW_2_20070628

Converting Bitmap in 2D Array

Asked by andy06 in Microsoft Visual C++, Microsoft Visual C#.Net, Signal Processing

Tags: C++, image processing,bitmap,Win32 API

About this solution