DeviceConnectedEvent is raised twice. The first type of device is a webcam, then unknown. In the first case, I try to get supported formats which returns the array of length 1. Supported format is in 160x120 resolution.
Then thread is started, StartStreaming is called, camera LED turns on, but IsNewImageReady() always returns false.
Should I try another web cam (I have to buy it) or there is anything else I can do?
Supporting USB cameras is very hard on these little systems so I wouldn’t be surprised if some cameras do not work. We have tested it on the couple cameras we have and it worked fine. We use very cheap USB cameras, like the ones you see on eBay. Buying another camera may or may not solve the problem.
If this is for a serious commercial need then we can work with you on finding an appropriate camera. If this is a small project, or a hobby, then I recommend our camera https://www.ghielectronics.com/catalog/product/283
OK, I was able to make it work with Logitech C270 WebCam, but I’m still not able to accomplish following goal:
When user encloses his RFID card, I need to take a still image of him. I was able to complete this by using StartStreaming() method on system startup. When user uses his card, I draw actual image from camera into buffer and save on SD card, then send over LAN. It works, but after StartStreaming(), whole system slows down significantly I understand StartStreaming() is doing a lot of work on the background, but for my case, it is unusable
So my question is: what is the best solution (if any) for getting a still image as fast as possible?
OK, one last question. I believe that for my project should be better some serial camera. I found this one:
It looks nice until you read, that image transfer can take up to 30 seconds.
Please, has anyone any experience with this kind of camera? I would be grateful if anyone can share some real experience, especially how long it takes to make one picture.
I’m starting to play with an idea to solve my problem by using USBH_RawDevice class and implement an UVC by myself to get still image. I’m trying to study UVC 1.1 specification doc, wondering if it is even possible and if it brings me better performance. I presume that GHI premium libs source code isn’t available to help me begin with sources of USBH_Webcam class.
I understand StartStreaming() is doing a lot of work on the background, but for my case, it is unusable 