How to get camera frames

Development & Help
, , ,
1

I am building a QR code reader using zxing.net, and I want to access the latest camera frame from inside a coroutine. How to access the camera frames.
Also, Can we test the camera part in the emulator that comes with nrsdk.
Example code snippets are appreciated.

2

Access RGB Camera - NRSDK (gitbook.io)

Not sure about the emulator thoughā€¦ I think the challenge there would be the camera pose would not be relative to the images. You could create a ā€œpretendā€ camera using the WebcamTexture instead, and have that be used in the designerā€¦

3

Hey, did the code I sent in the PM not work? It doesnā€™t read a QR code in the emulator, but it definitely does when built to the glasses, as itā€™s exactly what I use.

Set a private variable
private NRRGBCamTexture RGBCamTexture { get; set; }

I had a bool and a function to activate and de-active the QR code scanner, but hereā€™s how to get the cam texture

RGBCamTexture = new NRRGBCamTexture();
RGBCamTexture.Play();

Then in update I used the bool I set to activate/deactivate the scanner, and if I was allowed to scan, I cased a few strings that the different QR codes contained from ā€˜resultā€™, but obviously you can do whatever you like and is needed here, this is just an example.

IBarcodeReader barcodeReader = new BarcodeReader();

var result = barcodeReader.Decode(this.RGBCamTexture.GetTexture().GetPixels32(), this.RGBCamTexture.Width, this.RGBCamTexture.Height);
      
            if (result != null)
            {
                // QRCode detected
            }
            else
            {
               // QRCode not detected
            }
        }
1 Like
5

HI, Iā€™d like to achive something similas. Is this all the code needed? Could you send me the code you sent in the PM? it will be much appreciate it.

Thanks

6

Hi, yes thatā€™s the same code above as in the PM. Itā€™s really simple. Iā€™ve used it on the Lights/Dev Kit and also on the Ultras, but changing RGBCam to WebCamTexture in order to use the phones camera to scan the QR codes since the Ultras donā€™t have a camera you can access.

The only thing I do different is move IBarcodeReader barcodeReader = new BarcodeReader(); to a function where I activate the scanner instead of being in Update.

7

Thanks, Iā€™ll let you know if I make it work