Camera Facing: If you're on a mobile device - this is the camera currently selected either facing you, "user" (selfie cam) or "environment" (front cam).Generally, the more megapixels the more detailed the photo, but these days megapixels are considered to be only one of many contributing factors to the quality of a photo or a video. Webcam MegaPixels: How many megapixels (a megapixel is one million pixels) of resolution in the cam's picture.Most modern TV screens have a 16:9 aspect ratio, while a smartphone is longer than it is wide, and has the opposite aspect ratio of 9:16. For example: old tv screens were usually in a more boxy aspect ratio of 4:3 (4 is width and 3 is length). Aspect Ratio: The ratio of width to length of the webcam's image.This resolution is commonly known as 1080p. For example: 1920X1080 means that the picture is 1920 pixels wide and 1080 pixels tall, for a total of 1920 times 1080 pixels: 2,073,600 pixels. Webcam Resolution: The number of pixels per row and column that are being captured.Frame rate: Frame rate or FPS is the amount of frames that are grabbed and displayed by your camera every second. Webcam Name: The name of the current webcam that the test is connected to.on Linux (only the beginning, but seems to work). Waiting, and FYI, I created a repo (my_libuvc). propose a PR after verification, code cleanup and confirmation it works.check whether other changes are needed to use Pan + Tilt + Zoom when available using v4l2 only.try to rebuild a full opencv set, without cap_libv4l ( WITH_LIBV4L = OFF IIRC, right ?).read libv4l capturing backend diverged from v4l backend #4563 and RFC: videoio: remove cap_libv4l in favour of cap_v4l #6859 to understand what happens.If I understand corectly what you mean, I got WITH_V4L and WITH_LIBV4L set to ON (please correct me if I'm wrong. Now, to be more precise, I remember I used both in my CMakefile.txt. Once done, I'll probably create a PR, just for the people who will need the diff (not sure integrate that in 3.4 is a good idea imho). I didn't create a PR yet, because some code is missing : if I'm not too wrong, we need a getter() in VideoCapture interface, to retrieve min / max values, and I only partially solved the issue.you are right : looks like I'm not using v4l2 as expected, and I'll have to investigate (my idea was to use the most universal solution.code cleanup (maybe use an enum instead of #defines, and so on)Įdit : added yet another possible a lot for your answer and the links (I'll check them asap), and apologies for the delay.more code factorization (separate or not all cases in the switch ?).to automagicaly use the limits linked to the current used device. a complete getter() to return min and max values being visible from VideoCapture instance, e.g.All the code is provided under the same license : MIT or BSD (up to you) Please have a look at : if you want to test and provide feedback. The full diff is available on my repo, branch 3.4 (NOT MASTER) Just don't forget to provide a clean initialization for all parameters, to avoid putting the webcam in some undefined state. zoom only tested on Windows, but other properties should work out of the box (sorry, no windows close to me at the moment).In meantime, I fixed Pan + Tilt and Zoom the same way. OpenCV version : 3.4.0 (tar.gz from releases), compiled by myself (g++-7.1.0 ) OS : Linux (Intel i7 x86_64, 16GB RAM + SSD, LinuxMint 18.3) But maybe the feature is simply missing in this webcam. It does not work with Microsoft LifeCam 3000.
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