Q: extending Trackable or getting grayscaled video frames without trackable classes

I can help you with getting grayscale video frames from the system. The State object contains the camera frame and active trackables that correspond to that frame.

Hello I'm wondering how I can get the RGB values from the const void * getPixels() callback. I've tried casting the const to different types of arrays without success.

Try this out: [CODE] if (image->getFormat() == QCAR::RGB565) { // for rbg565, the pixels are stored as an array of shorts const short* pixels = (const short*) image->getPixels(); // get the first pixel, as a test case short pixel = pixels[0]; // convert rbg565 short va

Thanks for the quick reply. I'll try this out tomorrow and inform you if I succeed! - Edit - Confirmed this works! Thanks again!

I've read Image.h, I hope to find a setPixel() function to process the image in my own algorithm. Of course, I didn't find it. Is there a way to set the pixel value? If so,I also want to know how to convert short to rgb565

The Image that comes from the tracker is read-only. That said, you can certainly make a copy of the pixel buffer and make changes to do your own work.

make a copy of the pixel buffer and make changes?? but how to render after make changes? It seems no function to change the pixels in the blackground

What are your trying to accomplish? You could make a copy of the pixel buffer and make changes, then bind it as a texture and render it yourself (using OpenGL). Look into the following OpenGL methods for more information: glGenTextures glBindTexture glTexImage2D - Kim