Re: background in OpenGL - Graphics Discussion Boards

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Re: Choose correct pixel (Intertesting problem)

mah_pankaj26-Nov-09 18:57

mah_pankaj

26-Nov-09 18:57

thanks tim. You are correct about the problem. But I dont have background color as a seprator because of cloud color. Without this clude I am using the fore and back color distance logic to get the correct color. But with this 3rd color problem is D'Oh! | :doh:

.
Up to no efficient solution for this in case anyone can help with more ideas.

IDirectDrawSurface::IsLost() never returns

Code-o-mat20-Oct-09 4:25

Code-o-mat

20-Oct-09 4:25

Good day folks!

Does anyone know what might cause IDirectDrawSurface7::IsLost() to hang? In a multithreaded application time to time it happens that when IsLost() is called on a surface (primary surface if that matters) to check if it needs restoring it never returns, execution sits somewhere in ddraw.dll or nt.dll...i guess it deadlocks on something but what? DDSCL_MULTITHREADED is specified when SetCooperativeLevel is used but not having it doesn't seem to change anything. Also this happens on multiple computers with different accelerator hardware and drivers so it shouldn't be any driver problem. So does anyone know what could cause IsLost() to never return?

Thanks in advance for any answers.

> The problem with computers is that they do what you tell them to do and not what you want them to do. <
> Sometimes you just have to hate coding to do it well. <

Reading an image

xoxoxoxoxoxox16-Oct-09 8:02

xoxoxoxoxoxox

16-Oct-09 8:02

I got scanned forms (JPEG/PDF format) having check boxes in front of each question. I'm looking for a way to digitally read those images and determine whether box is checked or not. Is there any code/article that can help me achieve this goal?

Thanks in advance

Re: Reading an image

ely_bob27-Oct-09 6:01

ely_bob

27-Oct-09 6:01

Try this ot perhaps this

or search for IMAGE ANALYSIS.

However you are probably going to have issues unless the forms have a stable format, and are read into the jpeg or pdf in a somewhat reliable manner...

simply what you could do is find the xy locations of the boxes and test for darkness coverage say a value of 50 % darkened (or maybe 10 if you have handwritten data) and just pluck the marks out "manually"... --but this would only work in situations where the first check box is say in the Rectangle(75,125, 10,10) it would be trivial.

How to convert bmp 32bpp image

FrederikL616-Oct-09 2:24

FrederikL6

16-Oct-09 2:24

Dear all,
is there anybody who can suggest me a program (possibly free)or a way to convert a 32bpp image to RGB565 bmp format?
Thank you in advance

Re: How to convert bmp 32bpp image

enhzflep20-Oct-09 19:28

enhzflep

20-Oct-09 19:28

Sure, what I'd do is load the image into an HBITMAP and then get a pointer to the image's pixel data. Since you know it's a 32 bit image you know you need 4 bytes per pixel.
One of those is an alpha, and you can dump it. The other 3 are the rbg values.

I haven't compiled this, treat it as pseudo code - it outlines a mathod of iterating through an image and down-sampling it. I'm assuming its an 32 bit rgba image.

short procPixel(char r, char g, char b)
{
            char tmp;
            char lobyte, hibyte;
            short result;
            r >>= 3;            //   r = 000rrrrr
            g >>= 2;            //   g = 00gggggg
            b >>= 3;            //   b = 000bbbbb

//         rrrrrggg gggbbbbb
            tmp = g;            // tmp = 00gggggg
            tmp <<= 5;         // tmp = ggg00000
            lobyte = b;      // lobyte = 000bbbbb
            lobyte |= tmp;   // lobyte = gggbbbbb

            tmp = r;            // tmp = 000rrrrr
            tmp <<= 3;         // tmp = rrrrr000
            hibyte = tmp;   // hibyte = rrrrr000
            tmp = g;            // tmp = 00gggggg
            tmp >>= 3;         // tmp = 00000ggg
            hibyte |= tmp;   // hibyte = rrrrrggg

            result = hibyte;
            result <<= 8;
            result |= lobyte;

            return nresult;
}

void myFunc(HBITMAP inputImage)
{
      BITMAP bmInfo;
      unsigned char *bitmapBits;
      unsigned char *curPixel;
      char r, g, b, a;
      int width, height, x, y;
      short r5g6b5;

      GetObject(inputImage, sizeof(bmInfo), &bmInfo);
      bitmapBits = (unsigned char*)bmInfo.bmBits;
      curPixel = bitmapBits;

      for (y=0; y<height; y++)
      {
            for (x=0; x<width; x++)
            {
                  r = curPixel[0];
                  g = curPixel[1];            // I forget which one is which for r, g, b
                  b = curPixel[2];
                  a = curPixel[3]; // this one I'm sure about
                  r5g6b5 = procPixel(r, g, b);
                  doSomething(r5g6b5, x, y);
                  curPixel += 4;
            }
      }
}

background in OpenGL

Ben_King14-Oct-09 22:43

Ben_King

14-Oct-09 22:43

Hi,

I want to display a static image as the background of the OpenGL window. It should be behind any object displayed in the scene. How to achieve this? Thanks in advance.

Ben

Re: background in OpenGL

Tim Craig15-Oct-09 8:46

Tim Craig

15-Oct-09 8:46

One way it to put your image on a big quad as a texture and position it perpendicular to the viewpoint. Depending on how you want it to appear as the camera moves, you'll have to recalculate it's position and orientation for each move. If you search for "billboarding" and OpenGL, you should find examples although it's often used for other background items.

You measure democracy by the freedom it gives its dissidents, not the freedom it gives its assimilated conformists.

how to get a Condition force in Direct X

Bruce Coa11-Oct-09 21:25

Bruce Coa

11-Oct-09 21:25

Hi,i wanna get a Condition force feedback ,such as Friction ,Spring etc.,but i don'tknow why i can not feel it.I set the structure DICONTION and DIEFFECT as following :

DWORD       dwAxes[1] = { DIJOFS_X } ;
LONG        lDirection[1] = { 1 } ;
DICONDITION diCondtion;
DIEFFECT    diEffect ;

diCondtion.dwNegativeSaturation=10000;
diCondtion.dwPositiveSaturation=10000;
diCondtion.lNegativeCoefficient=-10000;
diCondtion.lPositiveCoefficient=10000;
diCondtion.lOffset=0;
diCondtion.lDeadBand=2000;

diEffect.dwSize = sizeof(DIEFFECT) ;
diEffect.dwFlags = DIEFF_CARTESIAN | DIEFF_OBJECTOFFSETS ;
diEffect.dwDuration =  DI_SECONDS/10 ;
diEffect.dwSamplePeriod = 0 ;
diEffect.dwGain = DI_FFNOMINALMAX ;
diEffect.dwTriggerButton = DIEB_NOTRIGGER ;
diEffect.dwTriggerRepeatInterval = 0 ;
diEffect.cAxes = 1 ;
diEffect.rgdwAxes = dwAxes ;
diEffect.rglDirection = lDirection ;
diEffect.lpEnvelope = NULL ;
diEffect.cbTypeSpecificParams = sizeof(diCondtion) ;
diEffect.lpvTypeSpecificParams = &diCondtion ;


hr = g_lpDIDeviceJoystick-&gt;CreateEffect(GUID_Spring,&diEffect,
                                         &g_lpdi,NULL) ;

is any wrong with what i do ? If replace DICONDITION with DICONSTANTFORCE ,DIRAMPFORCE or DIPERIODIC ,accordingly i can get Constantforce ,RampForce ,PeriodicForce.but when it comes to DICONDITION
i can not get any force. who can tell me why ? any adivice is approciated ! oh ,i almost forget one thing !the joystick i used is MicroSoft sidewinder force feedback 2.

Dewarping a fisheye image to rectilinear

Shmulik286-Oct-09 3:36

Shmulik28

6-Oct-09 3:36

I have some fisheye (360 degree view) images and want to "dewarp" them back into rectilinear projections - I was hoping that someone may have some source code to share (C# preferred). I know that there are several programs out there that can do this, but I was hoping to understand the "how" through source code.

Thanks!

Re: Dewarping a fisheye image to rectilinear

Tim Craig6-Oct-09 11:43

Tim Craig

6-Oct-09 11:43

I've seen papers on the web that explain how it's done using various "cone" shaped mirrors but I don't recall any using a fisheye lens. There may or may not have been code attached to those articles, I just don't remember but if it was, it almost certainly wouldn't be in C#. The book "Learning OpenCV" by Gary Bradski has a chapter that explains how to use OpenCV and measure the intrinsic lens parameters and "correct" images based on them. This is just a case of correcting a very "bad" lens.

You measure democracy by the freedom it gives its dissidents, not the freedom it gives its assimilated conformists.

high important request

aboyaser2-Oct-09 4:05

aboyaser

2-Oct-09 4:05

to the one who will read my request
I am a student in the third year in the university and i have to present a project about scientific calculation which mean that i have to present a graphical project about movvment of some objects which i choose ,but the proplem is i don't have any idea about opengl or directx to start with .

so i need help by suggesting a project title and if there is some ready project which i can use it to start i wil be very thankfull

and thank you again

Re: low important response

Tim Craig2-Oct-09 18:07

Tim Craig

2-Oct-09 18:07

People here aren't going to do your homework for you. If you have a very specific question once you get started, you may get an answer. But you have to show a bit of effort before anyone here will help you.

You measure democracy by the freedom it gives its dissidents, not the freedom it gives its assimilated conformists.

Re: low important response

aboyaser3-Oct-09 23:27

aboyaser

3-Oct-09 23:27

any way thank you
you gived me a briliante idea
we must always learn from children

for the second time thank you
Big Grin | :-D

Re: low important response

Tim Craig4-Oct-09 8:03

Tim Craig

4-Oct-09 8:03

Apparently you and learning, never the twain shall meet.

You measure democracy by the freedom it gives its dissidents, not the freedom it gives its assimilated conformists.

WM ASF Writer Audio Recording problem

Subhash Madhukar30-Sep-09 16:03

Subhash Madhukar

30-Sep-09 16:03

Hi Friends,

I made a desktop and audio(mike) capture GRF in graphedit.

On some systems audio recording stops after 30 sec but video recording has no issue.

I did all things in source code(c++ application) tracked IMediaEvent, but as audio recording stopeed in between no error event is fired.

Note: problem occur only on some laptop pc till now it has not occured in any desktop PC

Laptop "qasf.dll" version is 10.0.03802
I tried with differnt versions of same dll but all in vain on the laptop.

System configuartion is below:
RAM - 1790MB
CPU - Intel(R) Core (TM)2 duo CPU 1.83Ghz(2 CPU)

GRF file is stored at below link

http://www.fileflyer.com/view/uiqJXB1[^]

Thanks,
Subhash

how can load and transform (with annotations or equivalent ) an tiff file and save it again? with visual basic 2005 or C#

xabalb29-Sep-09 5:52

xabalb

29-Sep-09 5:52

how can load and transform (with annotations or equivalent ) an tiff file and save it again (with visual basic 2005 or C#)

Re: how can load and transform (with annotations or equivalent ) an tiff file and save it again? with visual basic 2005 or C#

Richard MacCutchan29-Sep-09 22:29

Richard MacCutchan

29-Sep-09 22:29

xabalb wrote:
how can load and transform (with annotations or equivalent ) an tiff file and save it again (with visual basic 2005 or C#)

This question is both too vague and too broad. Please explain what you have tried and where you are having problems, and maybe someone will be able to assist you.

image processing

rizwana rashid28-Sep-09 10:20

rizwana rashid

28-Sep-09 10:20

what is the latest work done in image processing feild?

Re: image processing

Henry Minute28-Sep-09 10:37

Henry Minute

28-Sep-09 10:37

Well, I'm not doing much with Fields at the moment, although this last weekend I photoshopped some images of my sister's garden.

Hope this helps. Smile | :)

Henry Minute

Do not read medical books! You could die of a misprint. - Mark Twain
Girl: (staring) "Why do you need an icy cucumber?"
“I want to report a fraud. The government is lying to us all.”

Re: image processing

Tim Craig29-Sep-09 18:32

Tim Craig

29-Sep-09 18:32

I got my traffic cone tracking program to work.

You measure democracy by the freedom it gives its dissidents, not the freedom it gives its assimilated conformists.

Link to download photoshop cs4 [modified]

Mekong River30-Aug-09 17:12

Mekong River

30-Aug-09 17:12

Hi, does anyone know where is the direct hyperlink can I download Adobe Photoshp CS4 trail version? I try with Adobe website but the the download could not be start. I don't know why, I try to check their website resource but seem no solution. I already have my download manager (GetRight) and if someone have this software in any website please let me know. I need to download it for my study.

Thank in advance!!!

modified on Sunday, August 30, 2009 11:44 PM

Directx pls

nirishere30-Aug-09 11:55

nirishere

30-Aug-09 11:55

Anyone knows if a directx window can be transparent and a click-thru ?
like this example

Finding a polygon that encloses a set of points

gantww28-Aug-09 7:06

gantww

28-Aug-09 7:06

Greetings,
I'm trying to determine the best way to get a polygon from a set of points. The points are not in any particularly useful order (they are the endpoints of individual lines that fill the polygon in question). How can I easily take such a set of points and figure out the vertices of a polygon from them? The polygons may have gaps inside of them. Any ideas?

Thanks,
Will

Re: Finding a polygon that encloses a set of points

Luc Pattyn28-Aug-09 7:45

Luc Pattyn

28-Aug-09 7:45

so you need the hull or the convex hull of some objects? That is pretty straightforward, just google for those terms.

BTW: it is an algorithmic problem, not really a graphic one.

Smile | :)

Luc Pattyn

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