Re: Video resolution

Hi
   
      You are right about the parameter for cvNamedWindow, the 
1=CV_WINDOW_AUTOSIZE  is to set the window to the frame size, like it say my 
previous message.
   
      But Im not sure about the function "cvSetProperty to change the 
resolution of a captured image, it is not implemented for cameras". It is not 
implemented for all types of cameras?
  Because ir work fine for me, and Im using logitech webcams and a PTZ camera 
from activmedia robotics.
   
     It is important to say that Im using Opencv-0.9.7 (beta 5) and like the 
old 28735 message say he is using cvcam lib, I suppose he is using 
Opencv-0.9.5. So it maybe was not implemented at that time.
   
  Regards
              Rafael Nevarez
   
  

Kok Jun <ck_jun@xxxxxxxxxxx> wrote:
  hi thanks for the reply.

After playing around with the code, it seems that the parameter for the 
cvNamedWindow when set to 0 and not 1, then will enable the window to be 
resized using the cvResizeWindow function.

But even then, like u said, only the size has changed, the resolution still 
remains the same...

According to what i read from the documentation regarding using 
cvSetProperty to change the resolution of a captured image, it is not 
implemented for cameras yet, thus didnt work for me... like Nathan, i came 
across the solution to that in the posting 
http://groups.yahoo.com/group/OpenCV/message/28735.

Regards
KJ



>From: Rafael Nevarez <epilef99@xxxxxxxxx>
>Reply-To: OpenCV@xxxxxxxxxxxxxxx
>To: OpenCV@xxxxxxxxxxxxxxx
>Subject: Re: [OpenCV] Video resolution
>Date: Thu, 30 Mar 2006 09:38:50 -0800 (PST)
>
>Hello
>
>       It is weird that it hasnt work with the webcam, what type of webcam 
>you are using?
>
>  Try a cvWaitKey(500) after the cvResizeWindow, sometimes you have to give 
>a little time to the window to resize. And for the error you talk about, is 
>there a message?
>
>     Maybe it will be more easy to help you if you share the code.
>
>  regards
>
>        Rafael Nevarez
>
>Kok Jun <ck_jun@xxxxxxxxxxx> wrote:    Hi i tried doing what you suggested. 
>I tried it on a webcam as well as on a
>  matrox frame capture card.
>
>  for the webcam, there was no effect, the window still remained the same
>  size...
>
>  for the matrox, there was an error and the program had to 
>terminate...would
>  you know what the problem might be?
>
>  Regards
>  KJ
>
>
>  >From: Rafael Nevarez <epilef99@xxxxxxxxx>
>  >Reply-To: OpenCV@xxxxxxxxxxxxxxx
>  >To: OpenCV@xxxxxxxxxxxxxxx
>  >Subject: Re: [OpenCV] Video resolution
>  >Date: Tue, 28 Mar 2006 09:29:11 -0800 (PST)
>  >
>  >Hi
>  >
>  >     If you want to change the resolution of the captured frame, use:
>  >
>  >  cvSetCaptureProperty(frame, CV_CAP_PROP_FRAME_WIDTH, 320); //640
>  >  cvSetCaptureProperty(frame, CV_CAP_PROP_FRAME_HEIGHT, 240); //480
>  >
>  >     Or if you want to only to change the size of the window use:
>  >
>  >      cvNamedWindow("camara", 1); //CV_WINDOW_AUTOSIZE);  Set to the 
>size
>  >of the frame
>  >      cvResizeWindow("camara", 320, 240);
>  >
>  >  Regards
>  >
>  >Kok Jun <ck_jun@xxxxxxxxxxx> wrote:    hi,
>  >
>  >  when i use the function cvCaptureFromCam(-1), it automatically 
>displays a
>  >  window of a default size.
>  >
>  >  what can i do so that the display window will be of the size 320x240?
>  >
>  >  thanks!!
>  >
>  >  Regards
>  >  KJ
>  >
>  >
>  >
>
>
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