Got Zbar (Python) working on A Raspi 2 for decoding QR-codes. Works OK-ish with a simple € 12,= webcam as with the C920.
I also have a very...very simple € 49,= Android Tablet (TM704: 1 GHz Dual-Core , 0.3 MP camera).
Zbar on the Raspi 2 is more than 5 times as slow in recognising the QR codes: approx 2.5-3 seconds for the PI vs. 0.5 sec. for the tablet. There is a 2 second 'lag' in processing the images from either webcam although the CPU never gets near 100%.
Is there something I can do to speed up the PI in processing the webcam images and reduce this 'lag'? I already tried things like GPU_mem=512 and force_turbo=1 but to no avail.
Is forcing the simple webcam to downscale and use 320x240 an idea? Less computing time maybe ?