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Michael Schäuble wrote: Seems to make sense, but how to implement such a task in a VB program?
it's hard to answer that without knowing how you are storing your image data. the format you use to hold the image data will determine what you have to do to get at the blue channel.
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Hi Chris, thanks for your time.
The files are in 10-bit DPX format (linear RGB), which is basically an uncompressed bitmap format and unsupported from GDI+. By now I read it into a RGB Array and throw 2 bits in order to have it displayed, so I have a System.Drawing.Image object I can access and e.g. put it into a picture box. Is that the additional information you needed or did I misunderstand you?
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if you have the RGB array, you should be able to simply copy the B data out of it, right?
maybe i'm misunderstanding now.. 
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Maybe I didn't make it clear enough... I don't want to extract the blue channel. What I want is to
1. detect some kind of 'blue level' in a reference picture (only one, non-damaged frame)
2. transfer it to a complete series of other frames/images (the whole scene), from which the (damaged) blue channel had been erased before.
Like when you re-adjust the color levels in a histogram in order to get natural colors - but automatically, using a reference instead of user interaction. Is that clearer?
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Even if you have the blue data from an undamaged frame, how are you going to decide which pixels in the damaged frames to apply it to? The pixels will move around as the scene progresses. (I'm assuming the blue data in the damaged frames is total garbage) If you could partition each frame into regions and match the regions between frames, you might apply the blue by region and maybe adjust it based on correlation with the red and green channels with some hand adjustment if needed and that "if" is more like "probably".
Have you researched how they apply the colors to old black and white movies? I know in the early days they did that by identifying regions and hand selecting colors which were then automatically propagated forward with hand touchups. Hopefully, that has progressed since the last time I read anything about it.
You measure democracy by the freedom it gives its dissidents, not the freedom it gives its assimilated conformists.
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what if you simply copy the blue channel from an undamaged frame to the next N frames? it won't match perfectly, but it might be better than nothing.
otherwise, yes, you could generate a histogram from the blue channel of an undamaged frame, then try to force the blue channel in subsequent frames into a similar distribution (find black % and white % from the good frame and then stretch the bad frames to match those %s). that would be pretty simple.
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Chris,
this sounds exactly what I imagined ...! And 'that would be pretty simple' sounds extremely teasing  .
The blue channel isn't completely damaged, it's more or less stained in the blue resulting from fungus that affected irregular regions on the upper/outside layer of some frames. Playing the movie, it looks a bit like ghosts swirling around.
Since there seems to be a way on the basic ideas path, I'll try to find some code samples when I have some extra time again. Or do you even have a link or snippet available that leads in the right direction?
Thanks for now,
and have a nice day
Mick
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Hi,
I am displaying 3D models using opengl and VC++.
I have implemented code to rotate, move, zoom the model by moving camera (using gluLookAt() )
Now I want to add one cross hair cursor in front of camera view port(at center of screen), but when I tried to rotate or zoom the model the cursor also rotates or zoom along with model.
How I can make cursor lie at same position while rotating model.
Please help me 
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After you are done rendering the rest of the scene, reset your view matrix and projection matrix to width and height of your screen and with and ortho projection. Then Draw your cross hair in the center. It does not have to exist in world space. Basically, it is a HUB display on the near plan of your view.
ARon
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But I want to do only rotation on cursor (it is same as three unit axes rotates about one fixed point) which was done on entire 3d model but to avoid pan and zoom operations. How to do this ???
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I not sure what you are trying to do but this is how I draw an object(s) in space. Forgive me it I c#.
static public void RenderScence()
{
Object LockThis = new Object();
lock (LockThis)
{
Gl.glClear(Gl.GL_COLOR_BUFFER_BIT | Gl.GL_DEPTH_BUFFER_BIT);
#region Draw Scene From Camera View
#region Set the Current Camera Matrix
Matrix_44 HTotal = CurrentCamera.HTotal;
Gl.glMatrixMode(Gl.GL_PROJECTION);
Gl.glLoadIdentity();
Gl.glLoadMatrixf(HTotal.GetListValues());
Gl.glMatrixMode(Gl.GL_MODELVIEW);
Gl.glLoadIdentity();
#endregion
foreach (ISpatialNode obj in WorldObjectList)
if (obj.IsVisible) obj.RenderOpenGL();
#endregion
Gl.glFinish();
}
}
Base on your description I would create a crosshair class and maintain it orientation and position in the world. When it is time to render the crosshair I would just loaded its Position and Rotation in to the ModelView matrix and then draw it as if it were in free space.
References.
My article on transforms easily adapted to c++.
Space and Matrix Transformations - Building a 3D Engine[^]
Others probably better
Interactive Techniques in Three-dimensional Scenes (Part 1): Moving 3D Objects with the Mouse using OpenGL 2.1[^]
A New Perspective on Viewing[^]
Arcball Module in C# - Tao.OpenGL[^]
ARon
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Thanks for ur reply.
I have tried to reset the modelview matrix and projection matrix and I am successful to display axes 90 percent, the remaining problem is that while rotating the 3d model flickers (at start zoom - in and at end at normal size and position).
I have tried this code after finishing of rest 3d model drawing :
glMatrixMode(GL_PROJECTION);
glGetDoublev (GL_PROJECTION_MATRIX, projMatrix);
glLoadIdentity();
GLdouble gldAspectRatio = (GLdouble) ViewportSize.right/(GLdouble) ViewportSize.bottom;
glOrtho ( pViewVolumeAxe[0], pViewVolumeAxe[1],
pViewVolumeAxe[2]/gldAspectRatio,
pViewVolumeAxe[3]/gldAspectRatio,
pViewVolumeAxe[4], pViewVolumeAxe[5] );
glMultMatrixd(projMatrix);
glMatrixMode(GL_MODELVIEW);
glGetDoublev (GL_MODELVIEW_MATRIX ,modelMatrix);
glLoadIdentity();
glTranslated(-modelMatrix[12], -modelMatrix[13], -modelMatrix[13]);
glMultMatrixd(modelMatrix);
glPushMatrix();
glTranslatef(fXTrans, fYTrans, fZTrans);
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Hi.
I can not good speack english . I want to collapsible regions (selected text) in the richtextbox control .
please see this image ::
http://www.sapphiresteel.com/IMG/gif/collapsible_region.gif
My language is C# .
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Hi.
If I understand you correctly. the term you're searching for is 'Code Folding[^]'
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The program in OpenGL with Texture just didnot work in my cimputer,which work well in others' computer.
where is the crux,any help is appreciated.
The code is in the former message.
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I can't give a good answer for this, but I can comiserate:
If I use a rectangle to exclude an area from a Graphics drawing area in C#, on some machines it also excludes the pixel before and the pixel after the intended exclude area, but only for the horizontal axis.
Same video chip set on all machines, various drivers.
I just worked around it, but what a pain.
Silver member by constant and unflinching longevity.
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From your code, it looked like the program gets the texture from a separate file. Did you copy the texture file to your computer along with the .exe?
You measure democracy by the freedom it gives its dissidents, not the freedom it gives its assimilated conformists.
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First! Thanks for you help!
then, how could i copy the texture file to my compter along with the .exe!
I could not understand you say.
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Hi,
it looks like pFile = fopen("桌面.bmp", "rb"); is opening an image file; so you need to have that present next to your EXE file.
one way is to copy the files manually (you probably only copied the EXE so far);
another way (more complex) would be to create an installer;
and finally you could turn the BMP file into a resource, that would then be stored inside the EXE (that requires some code changes to use it).
Luc Pattyn
I only read code that is properly indented, and rendered in a non-proportional font; hint: use PRE tags in forum messages
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hi everyone,
I have vista service pack 1(64bit) and I installed "Microsoft DirectX SDK (June 2006)" now my question is can I use of Directx 10 or I should use of Directx9?
how can I undrestand which one of them can I use? I asked this question because I have problem with "D3D10CreateDeviceAndSwapChain".
Thanks?
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Initially, you want to determine the capabilities of your graphics card. That really is the main determinant for which APIs you can use in your application. Many applications call GetDeviceCaps when first initializing the Direct3D Device (this is the recommended technique both at MSDN, and in all the books written about DirectX 9 and 10 that I've read).
Have a look at: D3DCAPS Structure[^] over at MSDN.
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My graphic card is 8600 gts and it supports of Directx 10.
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Probably the most comprehensive approach is to look for the Utility that comes with the DirectX SDK (both version 9 and 10). It lives in the Utilities directory of wherever you installed the SDK on disc. As I recall, it's name is something obvious like, "DX9Capabilities". Launch it, and it will automatically query your Graphics Card and show you graphically what it's capabilities are. Then all you have to do is do a little research into what each designation actually means. The documentation that comes with the SDK should explain it all. You will discover that some DirectX APIs don't work because your Graphics Card doesn't perform a certain operation. It's a tedious process, but necessary in many circumstances where you are actually instructing the GPU to perform some computation (just by calling a standard DirectX API in your code). The API will often just fail silently, or return an almost useless error code like, D3DERR_INVALIDCALL. Determining your Graphics card capabilities beforehand prevents this kind of thing.
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unsigned int ID;
int imageWidth;
int imageHeight;
unsigned char *image;
FILE *pFile = 0;
BITMAPINFOHEADER bitmapInfoHeader;
BITMAPFILEHEADER header;
unsigned char textureColors = 0;
pFile = fopen("桌面.bmp", "rb");
if(pFile == 0) return false;
fread(&header, sizeof(BITMAPFILEHEADER), 1, pFile);
if(header.bfType != BITMAP_ID)
{
fclose(pFile);
return false;
}
fread(&bitmapInfoHeader, sizeof(BITMAPINFOHEADER), 1, pFile);
imageWidth = bitmapInfoHeader.biWidth;
imageHeight = bitmapInfoHeader.biHeight;
if(bitmapInfoHeader.biSizeImage == 0)
bitmapInfoHeader.biSizeImage = bitmapInfoHeader.biWidth *
bitmapInfoHeader.biHeight * 3;
fseek(pFile, header.bfOffBits, SEEK_SET);
image = new unsigned char[bitmapInfoHeader.biSizeImage];
fread(image, 1, bitmapInfoHeader.biSizeImage, pFile);
for(int index = 0; index < (int)bitmapInfoHeader.biSizeImage; index+=3)
{
textureColors = image[index];
image[index] = image[index + 2];
image[index + 2] = textureColors;
}
fclose(pFile);
glPixelStorei(GL_UNPACK_ALIGNMENT,1);
glGenTextures(1, &ID);
glBindTexture(GL_TEXTURE_2D, ID);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_S,GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D,GL_TEXTURE_WRAP_T,GL_REPEAT);
gluBuild2DMipmaps(GL_TEXTURE_2D, 3, imageWidth,
imageHeight, GL_RGB, GL_UNSIGNED_BYTE,
image);
glEnable(GL_TEXTURE_2D);
glTexEnvf(GL_TEXTURE_ENV,GL_TEXTURE_ENV_MODE,GL_REPLACE);
glPushMatrix();
glScaled(45.0,30.0,0);
glBindTexture(GL_TEXTURE_2D, ID);
glBegin(GL_QUADS);
glTexCoord2f(0.0f, 0.0f); glVertex3f(-2.0f, -1.0f, 0.0f);
glTexCoord2f(1.0f, 0.0f); glVertex3f(-2.0f, 1.0f, 0.0f);
glTexCoord2f(1.0f, 1.0f); glVertex3f( 0.0f, 1.0f, 0.0f);
glTexCoord2f(0.0f, 1.0f); glVertex3f( 0.0f, -1.0f, 0.0f);
glEnd();
glPopMatrix();
GLvoid ReShapeGLScene( GLsizei width,GLsizei height )
{
glViewport(0,0,(GLsizei)width,(GLsizei)height);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
glOrtho((GLdouble)-450.0,(GLdouble)450.0,(GLdouble)-300.0,(GLdouble)300.0,50.0,-10.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
}
I think i must be somewhere wrong ,but i am not a expert,and cannot find it .The followings are some set about my code
static PIXELFORMATDESCRIPTOR pfd =
{
sizeof(PIXELFORMATDESCRIPTOR),
1,
PFD_DRAW_TO_WINDOW|
PFD_SUPPORT_OPENGL|
PFD_DOUBLEBUFFER,
PFD_TYPE_RGBA,
24,
0,0,0,0,0,0,
0,
0,
0,
0,0,0,0,
32,
0,
0,
PFD_MAIN_PLANE,
0,
0,0,0
};
thanks advance
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