C / C++ / MFC

12-Mar-08 3:17

Friends,I want to Segment selected region from the video frames, Say from the video frame 1 I selected an actor with no of mouse clicks(to identify the region boundry) manually, I am looking for good and algorithm/Fram Work which can segment it from the bacground or which can set all the pixel except the actor to white in all the rest of the frames
(C++ / C# or any..)
any smart idea pls

Thanx

Rajkumar R12-Mar-08 3:42

12-Mar-08 3:42

work with WIN32 or GDI+ regions.

Create two region
1) Rectangular Frame Region (CreateRectRgn)
2) Segment Selected Region (CreatePolygonRgn)

Get the difference of region
CombineRgn(Frame, segment, RGN_DIFF)

Load the image to HDC
Then fill the difference region with FillRgn() of your choice color.

alternatively you can use SelectClipRgn() to clip the portion when you draw.

ptr_Electron12-Mar-08 5:46

12-Mar-08 5:46

Thank you for responce, Well.. Filling the difference (RGN) will not segment the object from the bacground, For Example if a sequence of video frames contains a person walking in a forest, I want only walking person, to be in all the frames, Fill the rest of the region(forest) with some color.

Thanks

Rajkumar R12-Mar-08 5:55

12-Mar-08 5:55

ptr_Electron wrote:
Fill the rest of the region(forest) with some color.

and

ptr_Electron wrote:
Filling the difference (RGN)

is this the same.

BTW, this works by the assumption that you find the region of the person manually (as you specified) in each frame.

ptr_Electron wrote:
Filling the difference (RGN) will not segment the object from the bacground

what is the difference region, it is the background, if you fill the difference region it is filling the background.

ptr_Electron12-Mar-08 6:04

12-Mar-08 6:04

Thanks for responce...but there is some displacement(any direction) in the forground and bacground object(rgn) also, in the next comming frames.. so I not quite clear... by the way May I know what BTW is..

Rajkumar R12-Mar-08 6:10

12-Mar-08 6:10

ptr_Electron wrote:
but there is some displacement(any direction) in the forground and bacground object(rgn) also

This requires some thing like "motion detection", i don't have experience in this. search and let others respond to it.

see also.
Motion_Detection[^]

ptr_Electron wrote:
by the way May I know what BTW is..

By the Way

ptr_Electron12-Mar-08 22:41

Select ListView Control`s item

12-Mar-08 22:41

Ok Thanks you very much

bhat12-Mar-08 3:01

bhat

12-Mar-08 3:01

Hi
Win32 API in VC++ using VS6!
I am using ListView Control in my program .......everything is working fine......but the problem is when i select the Ist item the whole line(i.e Row) should get selected .....but it select only the item at Ist Row & Ist Column......

tell me how to do it

AbidBhat

Re: Select ListView Control`s item

Rajkumar R12-Mar-08 3:24

Re: Select ListView Control`s item

12-Mar-08 3:24

missing LVS_EX_FULLROWSELECT style ?

bhat12-Mar-08 3:41

bhat

12-Mar-08 3:41

thanx Raj

AbidBhat

How to allocate multi-dimensional pointer in c and c++? for example: char*** str;

Gofur Halmurat12-Mar-08 2:48

Re: How to allocate multi-dimensional pointer in c and c++? for example: char*** str;

12-Mar-08 2:48

Hello everybody,
how to allocate multi-dimensional pointer in c and c++?
what i mean by multi-dimensional pointer is: for example char**, or long***

<br />
Here is what i did. but i does not allocate memory properly.<br />
....<br />
char ** pString;<br />
1)first  method<br />
pString = (char**)calloc(32*32,sizeof(char));<br />
1)Second  method<br />
pString = new char[32][32];<br />
....<br />

both of them don't allocate memory properly.
Is there any other way to allocate multi-dimensional pointers?

thanks

It is never late to learn

toxcct12-Mar-08 2:59

toxcct

12-Mar-08 2:59

in C (therefore C++), you could do this :

char matrice[10][10] = NULL;
 
matrice = malloc(10*10*sizeof(char));
 
for (int i = 0; i < 10; i++) {
    for (int j = 0; j < 10; j++) {
        matrice[i][j] = '\0';
    }
}

of course, never forget to free the memory you allocated with malloc (and in C++, never forget to delete the memory you allocated with new).

however, C++ provides built-in containers which are more secure when dealing with dynamically-sized arrays, and prevent from memory leaks...
for that, you may have a look at std::vector<>, std::list<>, std::deque<>, std::map<>...

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Re: How to allocate multi-dimensional pointer in c and c++? for example: char*** str;

Gofur Halmurat12-Mar-08 3:03

Re: How to allocate multi-dimensional pointer in c and c++? for example: char*** str;

12-Mar-08 3:03

Thanks for reply,

Your method works for multi-dementional arrays, but that does not work for char **.

is there any other way to allocate type char**?

thanks

It is never late to learn

David Crow12-Mar-08 3:01

David Crow

12-Mar-08 3:01

Gofur Halmurat wrote:
1)Second method
pString = new char[32][32];

pString = new char*[nFirstDimension];
for (int x = 0; x < nFirstDimension; x++)
    pString[x] = new char[nSecondDimension];

"Normal is getting dressed in clothes that you buy for work and driving through traffic in a car that you are still paying for, in order to get to the job you need to pay for the clothes and the car and the house you leave vacant all day so you can afford to live in it." - Ellen Goodman

"To have a respect for ourselves guides our morals; to have deference for others governs our manners." - Laurence Sterne

Re: How to allocate multi-dimensional pointer in c and c++? for example: char*** str;

Gofur Halmurat12-Mar-08 3:07

Re: How to allocate multi-dimensional pointer in c and c++? for example: char*** str;

12-Mar-08 3:07

Thanks for your reply?
it helped to think that way in your code.

<br />
char** pString;<br />
pString = (char**)calloc(32,sizeof(char*));<br />
for(int i=0;i<32;i++)<br />
{<br />
pString[i]=(char*)calloc(32,sizeof(char));<br />
}<br />

do u think it is right what i did?

thanks

It is never late to learn

Gofur Halmurat12-Mar-08 3:09