AXIOM Alpha

Fixed Pattern Noise Correction

We have fixed several bugs in the calibration software and can now measure/calibrate the fixed pattern directly inside the camera. The challenge here is that an accurate calibration requires a fully evenly lit image with all colour channels at equal brightness levels. Any slight deviation from this will result in a sub-optimal calibration profile, meaning the FPN corrections can quickly end up creating more artifacts than they are removing. Under optimal conditions, we've witnessed a 100% elimination of the fixed pattern, however for this we've had to create a special device with RGB LEDs controlled by the camera itself, and which is attached to the camera instead of a lens. We are now considering the production of a 3D printed version of this, which we can use/distribute with far greater ease in the future. As a final note on this topic, the correction of the pattern is already running inside the FPGA with 4K footage in real-time.