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Type: Posts; User: jenny_wui

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1. Thread: Smoothing the dges of a polygon

by jenny_wui
Replies
0
Views
77

Smoothing the dges of a polygon

1032

Hello every body, I have a polygon consisting of 26 points as shown in the figure. i would just like to smoothen the edges. Could you suggest me some simple way to do it? Thanks in advance.
2. Thread: Finding the convex hull of a set of points

by jenny_wui
Replies
4
Views
211

Thanks, a nice implementation has been given to...

Thanks, a nice implementation has been given to the following link:
http://en.wikibooks.org/wiki/Algorithm_Implementation/Geometry/Convex_hull/Monotone_chain
3. Thread: Finding the convex hull of a set of points

by jenny_wui
Replies
4
Views
211

I need to find convex hull in 2D. Actually I am...

I need to find convex hull in 2D. Actually I am looking for some relevant code in the net. Thanks.
4. Thread: Finding the convex hull of a set of points

by jenny_wui
Replies
4
Views
211

Finding the convex hull of a set of points

Hello every body, I need to find the convex hull of a set of points. Could any one help me how that can be done. Lastly, I need to find the boundary of the convex hull. Thanks.
5. Thread: Need some suggestion about reading and displaying an image file

by jenny_wui
Replies
11
Views
402

Thanks a lot.

Thanks a lot.
6. Thread: Need some suggestion about reading and displaying an image file

by jenny_wui
Replies
11
Views
402

Thank you very much Little body, I have installed...

Thank you very much Little body, I have installed devil and tried your code. It works fine in loading a jpeg image. Now Could you help a bit more. How to manipulate the pixel values of my image and...
7. Thread: Need some suggestion about reading and displaying an image file

by jenny_wui
Replies
11
Views
402

I tried to look at libjpeg website, but didn't...

I tried to look at libjpeg website, but didn't find any particular direction/ example about the use of it. Please provide me some suggestions.
8. Thread: Need some suggestion about reading and displaying an image file

by jenny_wui
Replies
11
Views
402

As i need to manipulate the pixel value and I...

As i need to manipulate the pixel value and I have already started coding in C, I just need the information from where the image data starts i.e. what is the marker for that as I already have the...
9. Thread: Need some suggestion about reading and displaying an image file

by jenny_wui
Replies
11
Views
402

Need some suggestion about reading and displaying an image file

Hello, I would like to read a jpeg file and display the pixel using glColor3f. I have extracted the pixel dimension from the image.
Now my quetion is pixelWidth by pixelHeight are the number of...
10. Thread: A simple question on displaying an image in grey scale

by jenny_wui
Replies
6
Views
457

Thanks for the reply. Could you explain the...

Thanks for the reply. Could you explain the process a bit more? It would be good if you can provide some link to some examples.
11. Thread: A simple question on displaying an image in grey scale

by jenny_wui
Replies
6
Views
457

Thank for the reply. Suppose, I would like to...

Thank for the reply. Suppose, I would like to convert grey values to rgb, i,e, '0' meaning pure blue and '255' pure red with green in between, then how to write in glColor3f(r,g,b)?
12. Thread: A simple question on displaying an image in grey scale

by jenny_wui
Replies
6
Views
457

A simple question on displaying an image in grey scale

I have one image displayed in grey scale with pixel values range from (0 to 255). How to display the image in grey scale? I use glColor3f( r, g, b, 1.0) for diplaying colored image. How to use it for...
13. Thread: Need some suggestion about image processing

by jenny_wui
Replies
1
Views
248

Need some suggestion about image processing

1010

Hello, need some suggestion about image processing to know whether it can be done using C /c++ as I am not familiar with MATLAB. I have attached one image. The arrow in the image show the...
14. Thread: Need some pre-processing help

by jenny_wui
Replies
2
Views
305

I have been able to read my raw images. 256 by256...

I have been able to read my raw images. 256 by256 with 1 byte per pixel. I have such 30 sections. I would like to do surface rendering. I would like to read the data and reconstruct the model. Could...
15. Thread: Need some pre-processing help

by jenny_wui
Replies
2
Views
305

Need some pre-processing help

Hello, I have a set of Disc Image File s. I need to reconstruct 3D model out of these images. Could anybody let me know how can I reconstruct 3D model from these images?
16. Thread: Texture mapping onto a disk

by jenny_wui
Replies
6
Views
460

Thank you so much for the clarification.

Thank you so much for the clarification.
17. Thread: Texture mapping onto a disk

by jenny_wui
Replies
6
Views
460

Thank you very much for the clarification. That...

Thank you very much for the clarification. That meanstexture coordinate varies according to theta i.e. (1 + cos(theta))/2,(1 +sin(theta))/2).
Suppose, for each triangle in the disk, the coordinates...
18. Thread: Texture mapping onto a disk

by jenny_wui
Replies
6
Views
460

Thank you. So for inbetween values of theta, u,v,...

Thank you. So for inbetween values of theta, u,v, will be linearly interpolated. Is it?
Could you explain a bit about why you are assigning those values to u and v?
Thanks again in advance.
19. Thread: Texture mapping onto a disk

by jenny_wui
Replies
6
Views
460

Texture mapping onto a disk

I am trying to map a texture on a disk. Each coordinate on the disk is defined by (rscos(theta), rsin(theta), 0). I know texture value ranges from (0,0) to (1,1). How to map texture coordinates to...
20. Thread: Lighting with OpenGL

by jenny_wui
Replies
2
Views
421

I have done it by setting the diffuse material...

I have done it by setting the diffuse material component to green and diffuse color to red. The object looks black. Is it ok?
21. Thread: Lighting with OpenGL

by jenny_wui
Replies
2
Views
421

Lighting with OpenGL

I am working with some lighting programming in OpenGL. I have a red sphere. Now when I make the diffuse light green, the sphere should look black, but I find the sphere looks still red. How can that...
22. Thread: Urgent help: using Matrox Imaging Library (MIL)

by jenny_wui
Replies
0
Views
218

Urgent help: using Matrox Imaging Library (MIL)

Has anyone ever compiled Matrox Imaging Library with OpenGL? I urgently need to process a MIL avi file and convert it to some MP\$ format. If any one has already experience in using it, please help me.
23. Thread: Polygonizing a grid after subtracting an irregular portion

by jenny_wui
Replies
5
Views
1,009

Thank you very much for taking time to reply. I...

Thank you very much for taking time to reply. I can extract the irregular boundary outline using matlab. MATLAB also gives the color at different gtid points. My main question how to polygonize the...
24. Thread: Polygonizing a grid after subtracting an irregular portion

by jenny_wui
Replies
5
Views
1,009

Polygonizing a grid after subtracting an irregular portion

980
I have a regular grid. I need to subtract someirregular part from it as shown in the figure. I know the coordinates of theportion to be subtracted. How can I polygonize the rest of the grid...
25. Thread: Fitting a curve within a triangle

by jenny_wui
Replies
2
Views
529

Thank you very much for the suggestion.

Thank you very much for the suggestion.
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