Defringe on CUDA

Red-green and blue-yellow fringes at the image periphery result from lateral chromatic aberrations (CA). This problem is relatively easy to fix. On the other hand, purple and green fringes in out-of-focus areas and along high-contrast boundaries are much more problematic. These fringes result from axial chromatic aberrations (wavelength-dependent focus shift), aberrations in image sensor microlenses and flare. In most cases, purple fringes appear in front of the plane of focus, and green fringes appear behind the plane of focus. The aberrations can happen anywhere in the image, not just the image periphery. Sometimes, they are so strong that they’re easily spotted in small previews, such as proxies and thumbnails. Axial CA affects nearly all lenses and it is particularly pronounced with fast lenses at wide apertures.

Color fringing can result from several physical phenomena

  • Lateral (transverse) chromatic aberration (red/green fringes, blue/yellow fringes)
  • Axial (longitudinal) chromatic aberration (purple and green fringes)

Our software can reduce chromatic aberrations on CUDA. This is not fully automatic process, so there are some parameters to get better quality of fringe removal. Defringe module could be incorporated in a standard image processing pipeline. That module is a part of Fast CinemaDNG Processor software which is intended for fast DNG processing on CUDA.

Defringe on CUDA

  • Input: 24/48-bit images data from HDD/SSD/RAID in PPM format or from CPU/GPU memory
  • Output format: 24/48-bit RGB image to show on monitor in realtime
  • High performance defringe and fast OpenGL output
  • Command-line application for Windows-10 and Linux Ubuntu

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