Display Grayscale Image from a Firewire Camera - C / C++ / MFC Discussion Boards

Re: visual c++ change button code

toxcct11-May-06 5:00

toxcct

11-May-06 5:00

this looks like Managed C++, so ask this in the C++/CLI forum...

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Re: visual c++ change button code

Hamid_RT11-May-06 5:11

Hamid_RT

11-May-06 5:11

I think yes
I see Control.SetBounds Method in (.NET Framework Class Library)

Re: visual c++ change button code

toxcct11-May-06 5:14

toxcct

11-May-06 5:14

textBox2.Text = st_x.ToString();

.Text properties are common to .NET controls

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Re: visual c++ change button code

Hamid_RT11-May-06 5:36

Hamid_RT

11-May-06 5:36

I saw one question C# here i think yesterday that of course cedric answer to the qeustion

Re: visual c++ change button code

Cedric Moonen11-May-06 5:00

Cedric Moonen

11-May-06 5:00

xcar wrote:
visual c++ position of button little code That is a little code for visual c++. That code change position of button.

Uuhhh

. I didn't understand anything. Could you please rephrase your sentence ?
Ans also, post a question Unsure | :~

Re: visual c++ change button code

toxcct11-May-06 22:56

toxcct

11-May-06 22:56

another question which remain without OP response... Sigh | :sigh:

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Re: visual c++ change button code

Cedric Moonen11-May-06 22:59

Cedric Moonen

11-May-06 22:59

Cédric Moonen
Software developper

Charting control

Display Grayscale Image from a Firewire Camera

surfman1911-May-06 4:19

surfman19

11-May-06 4:19

Hi,

i get a 32 bit RGBA Image from my firewire camera...and i want to display a gray scale image to a Picture Control with MFC!

convert function:

<br />
void CImageProcView::RGBA2Gray(char *Img1, char *Img2, unsigned int ByteSize)<br />
{<br />
	for(int i = 0; i<ByteSize/4; i++)<br />
	{<br />
		Img2[i]=((signed char)Img1[4*i]+(signed char)Img1[4*i+1]+(signed char)Img1[4*i+2])/3;<br />
	}<br />
}<br />

<br />
char *CurrentImage;<br />
char *GrayMap;<br />
CStatic	m_Img1;<br />
CBitmap Bitmap1;<br />
memcpy(Current,FireCapture->FlippedBuffer,FireCapture->grabBufferSize);<br />
<br />
RGBA2Gray(CurrentImage, GrayMap, FireCapture->grabBufferSize); // FireCapture->grabBufferSize = 307200<br />
<br />
// FireCapture->pVih->bmiHeader.biWidth = 320<br />
// FireCapture->pVih->bmiHeader.biHeight = 240<br />
// FireCapture->iBitDepth = 32 ... i get a 32 bit RGBA from the firewire camera!<br />
Bitmap1.CreateBitmap(FireCapture->pVih->bmiHeader.biWidth, FireCapture->pVih->bmiHeader.biHeight, 1, 8, GrayMap);<br />
<br />
m_Img1.SetBitmap(Bitmap1);<br />

somthing dont work with this CStatic Picture Control;/ any idea? i think the CreateBitmap dont take the cBitsPerPel;/

bye

Re: Display Grayscale Image from a Firewire Camera

Russell^'11-May-06 5:00

Russell^'

11-May-06 5:00

Only about the algorithm:

surfman19 wrote:
void CImageProcView::RGBA2Gray(char *Img1, char *Img2, unsigned int ByteSize)
{
for(int i = 0; i {
Img2[i]=((signed char)Img1[4*i]+(signed char)Img1[4*i+1]+(signed char)Img1[4*i+2])/3;
}
}

I think that this will generate some overflows, I like more this:

Img2[i]=signed char(((int)Img1[4*i]+(int)Img1[4*i+1]+(int)Img1[4*i+2])/3);

and why signed? Is it better using unsigned char/int ?

bye Smile | :)

Re: Display Grayscale Image from a Firewire Camera

surfman1911-May-06 7:49

surfman19

11-May-06 7:49

<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 />

why could the CStatic dont display the grayscale image????hm;/
cu

Re: Display Grayscale Image from a Firewire Camera

Justin Tay11-May-06 15:18

Justin Tay

11-May-06 15:18

Your loop is already wrong. Img2 is an unsigned char *, so Img2[0] refers to byte 0, Img2[1] refers to byte 1, etc. And you should be creating your bitmap using CreateDIBitmap().

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
  }
}

If you find it difficult to think in terms of bytes, you can always cast it to RGBQUAD.

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;
  }
}

Re: Display Grayscale Image from a Firewire Camera

surfman1912-May-06 0:25

surfman19

12-May-06 0:25

<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 />

your grayscale is now 32 bit right? cant i use 8 bit?

cu

-- modified at 6:28 Friday 12th May, 2006

Re: Display Grayscale Image from a Firewire Camera

Justin Tay12-May-06 0:37

Justin Tay

12-May-06 0:37

So I forgot that pre eats up the < and >. Can't you guess that it's supposed to be static_cast<RGBQUAD*>(Img1)?

You can choose to use 8-bit but I didn't see you set your palette.

Re: Display Grayscale Image from a Firewire Camera

surfman1912-May-06 3:09

surfman19

12-May-06 3:09

<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 />

cu

-- modified at 11:29 Friday 12th May, 2006

CCombobox drawitem question

Tarek Jabri11-May-06 4:17

Tarek Jabri

11-May-06 4:17

Hi I have i combobox with dropdownlist style ( and ownerdrawfixed | havestrings)
am filling it using addstring method
how can i get the text of an item in the drawitem method?
thanks alot

Re: CCombobox drawitem question

Hamid_RT11-May-06 4:49

Hamid_RT

11-May-06 4:49

if you use WM_DRAWITEM
maybe it is some helpful to you
CString str;
GetLBText(lpDrawItem->itemID, str);

Re: CCombobox drawitem question

Tarek Jabri11-May-06 6:02

Tarek Jabri

11-May-06 6:02

thanks alot it worked fine in drawitem method after testing that the itemid is in the valid range of indices.
but the items seems so close to each other, how can this be solved?
and how can i remove the border from the edit area of the combo?
again thanks alot for your help

Re: CCombobox drawitem question

Hamid_RT11-May-06 6:49

Hamid_RT

11-May-06 6:49

for border see COMBOBOXINFO[^]

Re: CCombobox drawitem question

Hamid_RT11-May-06 7:23

Hamid_RT

11-May-06 7:23

like this only enter numbers in combobox

<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 />

UDP/ TCP socket problem

nahitan11-May-06 3:47

nahitan

11-May-06 3:47

Hi there,
I have a program that uses couple of sockets to communicate with two different devices. I have a socket class that supports both UDP and TCP (and Srever and client). I use INI file to specify what socket to use for every application. For the incomming messages in my code's enterance where I need to receive data from different clients, works for UDP socket but does not work for TCP.
Can any one tell me what could be the problem?
The following shows a part of my INI file for UDP socket. what changes should I make for the TCP one?
[DataLink Socket]
CfgTCP=TCP
CfgServer=TRUE
CfgLocalPort=1250
CfgRemotePort=1250
CfgRemoteAddr=127.0.0.1
CfgLocalAddr=127.0.0.1
CfgSrvMaxConnLimit=10
CfgCommType=BOTH
CfgKeepSockOpen=TRUE

Appreciate your help, Confused | :confused:

Re: UDP/ TCP socket problem

kk.tvm11-May-06 22:24

kk.tvm

11-May-06 22:24

Hi
Please search on code project for examples

KK

needing help in algorithm

V_shr11-May-06 3:46

V_shr

11-May-06 3:46

hello all
I need to find a red " + " in a image and i want a good algorithm .

thank you

-- modified at 9:48 Thursday 11th May, 2006

Re: needing help in algorithm

toxcct11-May-06 3:51

toxcct

11-May-06 3:51

i don't understand nothing...

if you want some help, you'll have to explain your scenario a bit more !

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Re: needing help in algorithm

V_shr11-May-06 3:57

V_shr

11-May-06 3:57

hello
I have a image , and a red plus is in it , and Iwant to find it's X and Y.
and I want a algorithm .

thanks a lot

Re: needing help in algorithm

toxcct11-May-06 4:03

toxcct

11-May-06 4:03

if it is a bmp, then i think you could go though each pixel and test the pixel around like this (i'm not an expert of image computing, so i could be wrong) :

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

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