Getting all available frame size from capture device with OpenCV
When you retrieve a frame from a camera, it is the maximum size that that camera can give. If you want a smaller image, you have to specify it when you get the image, and opencv will resize it for you.
A normal camera has one sensor of one size, and it sends one kind of image to the computer. What opencv does with it thereafter is up to you to specify.
I'm using Open CV 2.4.6 with C++ (with Python sometimes too but it is irrelevant). I would like to know if there is a simple way to get all the available frame sizes from a capture device?
For example, my webcam can provide 640x480, 320x240 and 160x120. Suppose that I don't know about these frame sizes a priori... Is it possible to get a vector or an iterator, or something like this that could give me these values?
In other words, I don't want to get the current frame size (which is easy to obtain) but the sizes I could set the device to.
Thanks!