2016-11-02 07:08:23 -0600 | received badge | ● Enthusiast |
2016-10-23 23:39:04 -0600 | asked a question | Multiple video channels give same image? Hello community, am working on a project involving realtime image processing of several consumer cameras on a normal computer. Since normal webcams can be problematic, I'm using an USB Video grabber with four channels: https://www.aliexpress.com/item/4CH-U... with PAL/NTSC camera modules. Now I have the following code in OpenCV 3.1 to read all the video streams: Despite using the "grab" and "retrieve" functions like described in the doc for "multi head cameras", the result is that I always get the input from the third physical channel (the cable has the number written on it) in all four image data-structures. No matter what I do, it never displays any of the other channels (have even tried returning to Opencv 2.3 where it cannot read any stream at all unfortunately). Anyone having a suggestion what the cause could be? Do I have to use any of the camera parameters enable any of the other streams? Or can't the second argument of the retrieve function be used the way I did? Huge thanks in advance! Greetings, Alex |